JavaWeb 开发 06 —— smbms项目实践

系列文章

JavaWeb 开发 01 —— 基本概念、Web服务器、HTTP、Maven

JavaWeb 开发 02 —— ServletContext、读取资源、下载文件、重定向和请求转发

JavaWeb 开发 03 —— Cookie 和 Session

JavaWeb 开发 04 —— JSP（原理、语法、指令、内置对象、JSP标签、JSTP标签）、JavaBean、MVC

JavaWeb 开发 05 —— 过滤器、监听器

JavaWeb 开发 06 —— smbms项目实践

---

实践：SMBMS项目

SMBMS是超市订单管理系统的英文缩写。

SMBMS项目SQL代码：https://download.csdn.net/download/qq_39763246/15352854

百度网盘：https://pan.baidu.com/s/16fNpMkGeXZud-U58Z5y67g 提取码: q3eq

项目架构：

数据库架构：

项目搭建准备工作

搭建项目时要先考虑是否使用Maven，如果用Maven则需要写依赖，如果不用Maven则要手动导入Jar包。这里选择使用Maven。

1、搭建一个Maven Web项目

2、配置Tomcat

3、启动Tomcat，测试项目能否跑起来

4、导入项目中会遇到的jar包

<dependencies>
    <!-- Servlet依赖 -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>4.0.1</version>
        <scope>provided</scope>
    </dependency>
    <!-- JSP依赖 -->
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>javax.servlet.jsp-api</artifactId>
        <version>2.3.3</version>
        <scope>provided</scope>
    </dependency>

    <!-- JSTL表达式依赖 -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>

    <!-- standard标签库 -->
    <dependency>
        <groupId>taglibs</groupId>
        <artifactId>standard</artifactId>
        <version>1.1.2</version>
    </dependency>
    <!-- 连接数据库 -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.47</version>
    </dependency>
    <!-- 代码测试 -->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
    <!-- 导入阿里巴巴的fastjson, 处理json转化 -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.62</version>
    </dependency>
</dependencies>

 
5、创建项目包结构

 
6、编写实体类

ORM映射：数据库 表—Java 类映射

Bill.java

package com.zcy.pojo;

import java.math.BigDecimal;
import java.util.Date;

public class Bill {
    
    
    private Integer id;   //id
    private String billCode; //账单编码
    private String productName; //商品名称
    private String productDesc; //商品描述
    private String productUnit; //商品单位
    private BigDecimal productCount; //商品数量
    private BigDecimal totalPrice; //总金额
    private Integer isPayment; //是否支付
    private Integer providerId; //供应商ID
    private Integer createdBy; //创建者
    private Date creationDate; //创建时间
    private Integer modifyBy; //更新者
    private Date modifyDate;//更新时间

    private String providerName;//供应商名称


    public String getProviderName() {
    
    
        return providerName;
    }
    public void setProviderName(String providerName) {
    
    
        this.providerName = providerName;
    }
    public Integer getId() {
    
    
        return id;
    }
    public void setId(Integer id) {
    
    
        this.id = id;
    }
    public String getBillCode() {
    
    
        return billCode;
    }
    public void setBillCode(String billCode) {
    
    
        this.billCode = billCode;
    }
    public String getProductName() {
    
    
        return productName;
    }
    public void setProductName(String productName) {
    
    
        this.productName = productName;
    }
    public String getProductDesc() {
    
    
        return productDesc;
    }
    public void setProductDesc(String productDesc) {
    
    
        this.productDesc = productDesc;
    }
    public String getProductUnit() {
    
    
        return productUnit;
    }
    public void setProductUnit(String productUnit) {
    
    
        this.productUnit = productUnit;
    }
    public BigDecimal getProductCount() {
    
    
        return productCount;
    }
    public void setProductCount(BigDecimal productCount) {
    
    
        this.productCount = productCount;
    }
    public BigDecimal getTotalPrice() {
    
    
        return totalPrice;
    }
    public void setTotalPrice(BigDecimal totalPrice) {
    
    
        this.totalPrice = totalPrice;
    }
    public Integer getIsPayment() {
    
    
        return isPayment;
    }
    public void setIsPayment(Integer isPayment) {
    
    
        this.isPayment = isPayment;
    }

    public Integer getProviderId() {
    
    
        return providerId;
    }
    public void setProviderId(Integer providerId) {
    
    
        this.providerId = providerId;
    }
    public Integer getCreatedBy() {
    
    
        return createdBy;
    }
    public void setCreatedBy(Integer createdBy) {
    
    
        this.createdBy = createdBy;
    }
    public Date getCreationDate() {
    
    
        return creationDate;
    }
    public void setCreationDate(Date creationDate) {
    
    
        this.creationDate = creationDate;
    }
    public Integer getModifyBy() {
    
    
        return modifyBy;
    }
    public void setModifyBy(Integer modifyBy) {
    
    
        this.modifyBy = modifyBy;
    }
    public Date getModifyDate() {
    
    
        return modifyDate;
    }
    public void setModifyDate(Date modifyDate) {
    
    
        this.modifyDate = modifyDate;
    }
}

Provider.java

package com.zcy.pojo;

import java.util.Date;

public class Provider {
    
    

    private Integer id;   //id
    private String proCode; //供应商编码
    private String proName; //供应商名称
    private String proDesc; //供应商描述
    private String proContact; //供应商联系人
    private String proPhone; //供应商电话
    private String proAddress; //供应商地址
    private String proFax; //供应商传真
    private Integer createdBy; //创建者
    private Date creationDate; //创建时间
    private Integer modifyBy; //更新者
    private Date modifyDate;//更新时间
    public Integer getId() {
    
    
        return id;
    }
    public void setId(Integer id) {
    
    
        this.id = id;
    }
    public String getProCode() {
    
    
        return proCode;
    }
    public void setProCode(String proCode) {
    
    
        this.proCode = proCode;
    }
    public String getProName() {
    
    
        return proName;
    }
    public void setProName(String proName) {
    
    
        this.proName = proName;
    }
    public String getProDesc() {
    
    
        return proDesc;
    }
    public void setProDesc(String proDesc) {
    
    
        this.proDesc = proDesc;
    }
    public String getProContact() {
    
    
        return proContact;
    }
    public void setProContact(String proContact) {
    
    
        this.proContact = proContact;
    }
    public String getProPhone() {
    
    
        return proPhone;
    }
    public void setProPhone(String proPhone) {
    
    
        this.proPhone = proPhone;
    }
    public String getProAddress() {
    
    
        return proAddress;
    }
    public void setProAddress(String proAddress) {
    
    
        this.proAddress = proAddress;
    }
    public String getProFax() {
    
    
        return proFax;
    }
    public void setProFax(String proFax) {
    
    
        this.proFax = proFax;
    }
    public Integer getCreatedBy() {
    
    
        return createdBy;
    }
    public void setCreatedBy(Integer createdBy) {
    
    
        this.createdBy = createdBy;
    }
    public Date getCreationDate() {
    
    
        return creationDate;
    }
    public void setCreationDate(Date creationDate) {
    
    
        this.creationDate = creationDate;
    }
    public Integer getModifyBy() {
    
    
        return modifyBy;
    }
    public void setModifyBy(Integer modifyBy) {
    
    
        this.modifyBy = modifyBy;
    }
    public Date getModifyDate() {
    
    
        return modifyDate;
    }
    public void setModifyDate(Date modifyDate) {
    
    
        this.modifyDate = modifyDate;
    }
}

Role.java

package com.zcy.pojo;

import java.util.Date;

public class Role {
    
    

    private Integer id;   //id
    private String roleCode; //角色编码
    private String roleName; //角色名称
    private Integer createdBy; //创建者
    private Date creationDate; //创建时间
    private Integer modifyBy; //更新者
    private Date modifyDate;//更新时间

    public Integer getId() {
    
    
        return id;
    }
    public void setId(Integer id) {
    
    
        this.id = id;
    }
    public String getRoleCode() {
    
    
        return roleCode;
    }
    public void setRoleCode(String roleCode) {
    
    
        this.roleCode = roleCode;
    }
    public String getRoleName() {
    
    
        return roleName;
    }
    public void setRoleName(String roleName) {
    
    
        this.roleName = roleName;
    }
    public Integer getCreatedBy() {
    
    
        return createdBy;
    }
    public void setCreatedBy(Integer createdBy) {
    
    
        this.createdBy = createdBy;
    }
    public Date getCreationDate() {
    
    
        return creationDate;
    }
    public void setCreationDate(Date creationDate) {
    
    
        this.creationDate = creationDate;
    }
    public Integer getModifyBy() {
    
    
        return modifyBy;
    }
    public void setModifyBy(Integer modifyBy) {
    
    
        this.modifyBy = modifyBy;
    }
    public Date getModifyDate() {
    
    
        return modifyDate;
    }
    public void setModifyDate(Date modifyDate) {
    
    
        this.modifyDate = modifyDate;
    }
}

User.java

package com.zcy.pojo;

import java.util.Date;

public class User {
    
    
    private Integer id; //id
    private String userCode; //用户编码
    private String userName; //用户名称
    private String userPassword; //用户密码
    private Integer gender;  //性别
    private Date birthday;  //出生日期
    private String phone;   //电话
    private String address; //地址
    private Integer userRole;    //用户角色
    private Integer createdBy;   //创建者
    private Date creationDate; //创建时间
    private Integer modifyBy;     //更新者
    private Date modifyDate;   //更新时间

    private Integer age;//年龄

    private String userRoleName;    //用户角色名称


    public String getUserRoleName() {
    
    
        return userRoleName;
    }
    public void setUserRoleName(String userRoleName) {
    
    
        this.userRoleName = userRoleName;
    }
    public Integer getAge() {
    
    
		/*long time = System.currentTimeMillis()-birthday.getTime();
		Integer age = Long.valueOf(time/365/24/60/60/1000).IntegerValue();*/
        Date date = new Date();
        Integer age = date.getYear()-birthday.getYear();
        return age;
    }
    public Integer getId() {
    
    
        return id;
    }
    public void setId(Integer id) {
    
    
        this.id = id;
    }
    public String getUserCode() {
    
    
        return userCode;
    }
    public void setUserCode(String userCode) {
    
    
        this.userCode = userCode;
    }
    public String getUserName() {
    
    
        return userName;
    }
    public void setUserName(String userName) {
    
    
        this.userName = userName;
    }
    public String getUserPassword() {
    
    
        return userPassword;
    }
    public void setUserPassword(String userPassword) {
    
    
        this.userPassword = userPassword;
    }
    public Integer getGender() {
    
    
        return gender;
    }
    public void setGender(Integer gender) {
    
    
        this.gender = gender;
    }
    public Date getBirthday() {
    
    
        return birthday;
    }
    public void setBirthday(Date birthday) {
    
    
        this.birthday = birthday;
    }
    public String getPhone() {
    
    
        return phone;
    }
    public void setPhone(String phone) {
    
    
        this.phone = phone;
    }
    public String getAddress() {
    
    
        return address;
    }
    public void setAddress(String address) {
    
    
        this.address = address;
    }
    public Integer getUserRole() {
    
    
        return userRole;
    }
    public void setUserRole(Integer userRole) {
    
    
        this.userRole = userRole;
    }
    public Integer getCreatedBy() {
    
    
        return createdBy;
    }
    public void setCreatedBy(Integer createdBy) {
    
    
        this.createdBy = createdBy;
    }
    public Date getCreationDate() {
    
    
        return creationDate;
    }
    public void setCreationDate(Date creationDate) {
    
    
        this.creationDate = creationDate;
    }
    public Integer getModifyBy() {
    
    
        return modifyBy;
    }
    public void setModifyBy(Integer modifyBy) {
    
    
        this.modifyBy = modifyBy;
    }
    public Date getModifyDate() {
    
    
        return modifyDate;
    }
    public void setModifyDate(Date modifyDate) {
    
    
        this.modifyDate = modifyDate;
    }
}

 
7、编写基础公共类

1. 数据库配置文件（resources目录下db.properties）

   driver=com.mysql.jdbc.Driver
   url=jdbc:mysql://localhost:3306/smbms?useUnicode=true&characterEncoding=utf8&useSSL=false
   username=root
   password=123456
   

2. 数据库公共类（java目录下dao的BaseDao.java）
   数据库参考我另一篇博客：数据库 —— Java操作MySQL

   package com.zcy.dao;
   
   import javax.servlet.jsp.jstl.sql.Result;
   import javax.servlet.jsp.jstl.sql.ResultSupport;
   import java.io.IOException;
   import java.io.InputStream;
   import java.sql.*;
   import java.util.Properties;
   
   public class BaseDao {
         
         
       private static String driver;
       private static String url;
       private static String userName;
       private static String password;
   
       //静态代码块：当类被加载时会执行
       static{
         
         
           //获取配置文件的流
           Properties properties = new Properties();
           InputStream is = BaseDao.class.getClassLoader().getResourceAsStream("db.properties");
   
           try {
         
         
               properties.load(is);
           } catch (IOException e) {
         
         
               e.printStackTrace();
           }
   
           driver = properties.getProperty("driver");
           url = properties.getProperty("url");
           userName = properties.getProperty("username");
           password = properties.getProperty("password");
       }
   
       //获取数据库连接
       public static Connection getConnection(){
         
         
           Connection connection = null;
           try {
         
         
               Class.forName(driver);
               connection = DriverManager.getConnection(url, userName, password);
           } catch (Exception e) {
         
         
               e.printStackTrace();
           }
           return connection;
       }
   
       //查询公共方法
       public static ResultSet execute(Connection connection,PreparedStatement preparedStatement,
               Object[] param) throws SQLException {
         
         
   
   
           //这里i+1是因为PreparedStatement 用的占位符是从1开始
           for (int i = 0; i < param.length; i++) {
         
         
               preparedStatement.setObject(i+1, param[i]);
           }
           ResultSet resultSet = preparedStatement.executeQuery();
   
           return resultSet;
       }
   
       //更新公共方法
       public static int update(Connection connection, PreparedStatement preparedStatement,
               Object[] param) throws SQLException {
         
         
   
           for (int i = 0; i < param.length; i++) {
         
         
               preparedStatement.setObject(i+1, param[i]);
           }
           int updateRows = preparedStatement.executeUpdate();
   
           return updateRows;
       }
   
       public static boolean closeResource(Connection connection, PreparedStatement preparedStatement, ResultSet resultSet){
         
         
           boolean flag = true;
           if (resultSet != null){
         
         
               try {
         
         
                   resultSet.close();
                   //让JVM回收，GC 垃圾回收机制
                   resultSet = null;
               } catch (SQLException e) {
         
         
                   e.printStackTrace();
                   flag = false;
               }
           }
           if (preparedStatement != null){
         
         
               try {
         
         
                   preparedStatement.close();
                   //让JVM回收，GC 垃圾回收机制
                   preparedStatement = null;
               } catch (SQLException e) {
         
         
                   e.printStackTrace();
                   flag = false;
               }
           }
           if (connection != null){
         
         
               try {
         
         
                   connection.close();
                   //让JVM回收，GC 垃圾回收机制
                   connection = null;
               } catch (SQLException e) {
         
         
                   e.printStackTrace();
                   flag = false;
               }
           }
           return flag;
       }
   }
   

3. 编写过滤器

   package com.zcy.filter;
   
   import javax.servlet.*;
   import java.io.IOException;
   
   public class CharacterEncodingFilter implements Filter {
         
         
       public void doFilter(
               ServletRequest request, ServletResponse response, FilterChain chain
                           ) throws IOException, ServletException {
         
         
           request.setCharacterEncoding("utf-8");
           response.setCharacterEncoding("utf-8");
           response.setContentType("text/html;charset=utf-8");
           chain.doFilter(request, response);
       }
   }
   

4. web.xml中注册

   <!-- 过滤所有请求，处理中文乱码 -->
   <filter>
       <filter-name>CharacterEncodingFilter</filter-name>
       <filter-class>com.zcy.filter.CharacterEncodingFilter</filter-class>
   </filter>
   <filter-mapping>
       <filter-name>CharacterEncodingFilter</filter-name>
       <url-pattern>/*</url-pattern>
   </filter-mapping>
   

 
8、导入静态资源，放在webapp目录下。

下载链接： CSDN

百度网盘：https://pan.baidu.com/s/16fNpMkGeXZud-U58Z5y67g 提取码: q3eq

登录功能

 
1、编写前端页面（login.jsp）

login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>系统登录 - 超市订单管理系统</title>
    <link type="text/css" rel="stylesheet" href="${pageContext.request.contextPath}/css/style.css" />
</head>
<body class="login_bg">
    <section class="loginBox">
        <header class="loginHeader">
            <h1>超市订单管理系统</h1>
        </header>
        <section class="loginCont">
	        <form class="loginForm" action="${pageContext.request.contextPath}/login.do"  name="actionForm" id="actionForm"  method="post" >
				<div class="info">${error }</div>
				<div class="inputbox">
                    <label>用户名：</label>
					<input type="text" class="input-text" id="userCode" name="userCode" placeholder="请输入用户名" required/>
				</div>	
				<div class="inputbox">
                    <label>密码：</label>
                    <input type="password" id="userPassword" name="userPassword" placeholder="请输入密码" required/>
                </div>	
				<div class="subBtn">
                    <input type="submit" value="登录"/>
                    <input type="reset" value="重置"/>
                </div>	
			</form>
        </section>
    </section>
</body>
</html>

 
2、设置欢迎页，web.xml中设置

<!-- 设置欢迎页（首页）  -->
<welcome-file-list>
    <welcome-file>login.jsp</welcome-file>
</welcome-file-list>

3、编写Dao层 得到用户登录的接口

package com.zcy.dao.user;
import com.zcy.pojo.User;
import java.sql.Connection;
import java.sql.SQLException;

//操作用户的Dao
public interface UserDao {
    
    
    /**
     * 获得想要登录的用户
     * @param connection 连接参数
     * @param userCode 用户账号
     * @return 返回想登录的用户对象，为null则没有该用户
     */
    public User getLoginUser(Connection connection, String userCode) throws SQLException;
}

4、编写Dao 接口的实现类

package com.zcy.dao.user;

import com.zcy.dao.BaseDao;
import com.zcy.pojo.User;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class UserDaoImpl implements UserDao {
    
    
    /**
     *
     * @param connection 连接参数
     * @param userCode 用户账号
     * @return 返回想登录的用户对象，为null则没有该用户
     * @throws SQLException
     */
    public User getLoginUser(Connection connection, String userCode) throws SQLException {
    
    
        ResultSet resultSet = null;
        User user = null;

        if (connection != null){
    
    
            String sql = "select * from smbms_user where userCode = ?";
            Object[] params = {
    
    userCode};

            resultSet = BaseDao.execute(connection, sql, params);

            if (resultSet.next()){
    
    
                user = new User();
                user.setId(resultSet.getInt("id"));
                user.setUserCode(resultSet.getString("userCode"));
                user.setUserName(resultSet.getString("userName"));
                user.setUserPassword(resultSet.getString("userPassword"));
                user.setGender(resultSet.getInt("gender"));
                user.setBirthday(resultSet.getDate("birthday"));
                user.setPhone(resultSet.getString("phone"));
                user.setAddress(resultSet.getString("address"));
                user.setUserRole(resultSet.getInt("userRole"));
                user.setCreatedBy(resultSet.getInt("createdBy"));
                user.setCreationDate(resultSet.getTimestamp("creationDate"));
                user.setModifyBy(resultSet.getInt("modifyBy"));
                user.setModifyDate(resultSet.getTimestamp("modifyDate"));
            }
            BaseDao.closeResource(null, null, resultSet);
        }
        return user;
    }
}

 
5、业务层接口

package com.zcy.service.user;
import com.zcy.pojo.User;
public interface UserService {
    
    
    /**
     * 用户登录
     * @param userCode 用户编号
     * @param password 用户密码
     * @return 存在该用户，则返回用户对象，不存在则为null
     */
    public User login(String userCode, String password);
}

 
6、业务层实现类

package com.zcy.service.user;

import com.zcy.dao.BaseDao;
import com.zcy.dao.user.UserDao;
import com.zcy.dao.user.UserDaoImpl;
import com.zcy.pojo.User;
import org.junit.Test;

import java.sql.Connection;
import java.sql.SQLException;

public class UserServiceImpl implements UserService {
    
    
    //业务层都会调用Dao层，所有我们要先引入Dao层
    private UserDao userDao;

    /**
     * 实例化Dao层的对象
     */
    public UserServiceImpl(){
    
    
        userDao = new UserDaoImpl();
    }

    /**
     * 在这个业务层调用Dao层的具体数据库操作，获得要登录的用户对象
     * @param userCode 用户编码
     * @param password 用户密码
     * @return 要登录的用户对象，为null则没有该用户
     */
    public User login(String userCode, String password) {
    
    
        Connection connection = null;
        User user = null;

        try {
    
    
            connection = BaseDao.getConnection();
            //在业务层调用对应的具体数据库操作，这里就是获取要登录的用户对象
            user = userDao.getLoginUser(connection, userCode);

        } catch (SQLException e) {
    
    
            e.printStackTrace();
        }finally {
    
    
            BaseDao.closeResource(connection, null, null);
        }
        if (user == null || !user.getUserPassword().equals(password))
            return null;
        else
            return user;
    }

    /**
     * 用于测试，可直接删除
     */
    @Test
    public void test(){
    
    
        UserServiceImpl userService = new UserServiceImpl();
        User admin = userService.login("admin", "abcdefg");
        System.out.println(admin.getUserPassword());
    }
}

 
7、编写Servlet

package com.zcy.servlet.user;

import com.zcy.pojo.User;
import com.zcy.service.UserService;
import com.zcy.service.UserServiceImpl;
import com.zcy.util.Constants;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class LoginServlet extends HttpServlet {
    
    
    //Servlet：控制层，调用业务层代码
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    
    
        System.out.println("LoginServlet————Start....");
        //获取用户编码和密码
        String userCode = req.getParameter("userCode");
        String userPassword = req.getParameter("userPassword");

        UserService userService = new UserServiceImpl();
        User user = userService.login(userCode, userPassword);
        if (user!=null){
    
    
            //有此人，登录成功
            //将用户信息放在session中
            req.getSession().setAttribute(Constants.USER_SESSION, user);
            //使用重定向到主页面
            resp.sendRedirect("jsp/frame.jsp");
        }
        else {
    
    
            //没有此人或密码错误，返回登录界面并给出提示
            req.setAttribute("error", "用户名或密码错误");
            //这里之所以用转发而不是重定向，是因为前端是调用request里的error变量
            //转发可以将请求转发出去，保证了error的存活
            req.getRequestDispatcher("login.jsp").forward(req, resp);
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    
    
        doGet(req, resp);
    }
}

之所以能够提示用户名或密码错误，是因为login.jsp中引用了error变量

在页面头部中，也引用了session中的用户信息

8、注册Servlet

<servlet>
    <servlet-name>LoginServlet</servlet-name>
    <servlet-class>com.zcy.servlet.user.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>LoginServlet</servlet-name>
    <url-pattern>/login.do</url-pattern>
</servlet-mapping>

注销拦截

1、注销功能：移除用户session并返回登录界面

LogoutServlet.java

package com.zcy.servlet.user;

import com.zcy.util.Constants;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class LogoutServlet extends HttpServlet {
    
    
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    
    
        doGet(req,resp);
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    
    
        //注销：移除用户session
        req.getSession().removeAttribute(Constants.USER_SESSION);
        resp.sendRedirect(req.getContextPath()+"/login.jsp");
    }
}

注册Servlet

<servlet>
    <servlet-name>LogoutServlet</servlet-name>
    <servlet-class>com.zcy.servlet.user.LogoutServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>LogoutServlet</servlet-name>
    <url-pattern>/jsp/logout.do</url-pattern>
</servlet-mapping>

 
2、登录拦截

package com.zcy.filter;

import com.sun.deploy.net.HttpResponse;
import com.zcy.pojo.User;
import com.zcy.util.Constants;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class LoginFilter implements Filter {
    
    
    public void init(FilterConfig filterConfig) throws ServletException {
    
    

    }

    public void doFilter(
            ServletRequest req, ServletResponse resp, FilterChain chain
                        ) throws IOException, ServletException {
    
    
        HttpServletRequest request = (HttpServletRequest)req;
        HttpServletResponse response = (HttpServletResponse) resp;

        //获得已登录的用户
        User user = (User) request.getSession().getAttribute(Constants.USER_SESSION);
        //如果用户没有登录或者已经注销，则再想进入主页面就会被拦截，然后重定向
        if(user == null)
            response.sendRedirect(request.getContextPath()+"/error.jsp");
        else
            chain.doFilter(req, resp);
    }

    public void destroy() {
    
    

    }
}

注册

<!-- 过滤未登录用户  -->
<filter>
    <filter-name>LoginFilter</filter-name>
    <filter-class>com.zcy.filter.LoginFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>LoginFilter</filter-name>
    <url-pattern>/jsp/*</url-pattern>
</filter-mapping>

密码修改

1、UserDao.java中添加方法

/**
* 修改用户密码
* @param connection 连接参数
* @param id 用户ID号
* @param password 用户新密码
* @return 返回修改的行数(1表示成功 0表示失败)
* @throws SQLException
*/
public int updatePassword(Connection connection, int id, String password) throws SQLException;

 
2、UserDaoImpl.java中添加方法

/**
*
* @param connection 连接参数
* @param id 用户ID号
* @param password 用户新密码
* @return 返回修改的行数(1表示成功 0表示失败)
* @throws SQLException
*/
public int updatePassword(Connection connection, int id, String password) throws SQLException {
    
    
    PreparedStatement preparedStatement = null;
    int updateRows = 0;

    if (connection != null){
    
    
        String sql = "update smbms_user set userPassword = ? where id = ?";
        preparedStatement = connection.prepareStatement(sql);
        Object[] params = {
    
    password, id};
        updateRows = BaseDao.update(connection, preparedStatement, params);
        BaseDao.closeResource(null, preparedStatement, null);
    }

    return updateRows;
}

 
3、UserServiceImp.java中添加方法

/**
* 根据用户id和密码修改用户密码
* @param id 用户id
* @param password 用户密码
* @return 返回true 或 false
*/
public boolean updatePassword(int id, String password) {
    
    
    Connection connection = null;
    boolean flag = false;
    try {
    
    
        connection = BaseDao.getConnection();
        if (userDao.updatePassword(connection, id, password) > 0)
            flag = true;
    } catch (SQLException e) {
    
    
        e.printStackTrace();
    }finally {
    
    
        BaseDao.closeResource(connection, null, null);
    }

    return flag;
}

 
4、UserServlet.java

package com.zcy.servlet.user;

import com.alibaba.fastjson.JSONArray;
import com.mysql.jdbc.StringUtils;
import com.zcy.pojo.User;
import com.zcy.service.UserService;
import com.zcy.service.UserServiceImpl;
import com.zcy.util.Constants;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;

public class UserServlet extends HttpServlet {
    
    
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    
    
        //从前端获取参数，根据参数执行对应方法
        String method = req.getParameter("method");
        if (method.equals("savepwd"))
            updatePassword(req,resp);
        else if (method.equals("pwdmodify"))
            pwdModify(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    
    
        doGet(req, resp);
    }

    //更新密码
    public void updatePassword(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    
    
        Object o = req.getSession().getAttribute(Constants.USER_SESSION);
        String newPassword = req.getParameter("newpassword");

        boolean flag = false;
        if (o != null && !StringUtils.isEmptyOrWhitespaceOnly(newPassword)){
    
    
            UserService userService = new UserServiceImpl();
            flag = userService.updatePassword(((User)o).getId(), newPassword);
            if (flag){
    
    
                //因为前端pwdmodify.jsp中留有一个message的位置，可以显示数据
                req.setAttribute("message", "密码修改成功，请重新用新密码登录");
                //移除用户Session，相当于自动注销
                req.getSession().removeAttribute(Constants.USER_SESSION);
            }
            else
                req.setAttribute("message", "密码修改失败");
        }
        else
            req.setAttribute("message", "新密码有问题");
        req.getRequestDispatcher("pwdmodify.jsp").forward(req,resp);
    }

    //验证旧密码，无需查询数据库，直接从当前session中的user对象获取
    public void pwdModify(HttpServletRequest req, HttpServletResponse resp){
    
    
        //从session中拿取用户对象
        Object o = req.getSession().getAttribute(Constants.USER_SESSION);
        //获取前端（Ajax部分）传过来的旧密码，并于user中的密码比对
        String oldPassword = req.getParameter("oldpassword");
        //用Map结果集作为响应，返回给前端（Ajax部分）
        Map<String, String> resultMap = new HashMap<String, String>();
        if (o == null){
    
    
            //session失效或过期时（真实网站的session会设置过期时间）
            resultMap.put("result", "sessionerror");
        }
        else if(StringUtils.isEmptyOrWhitespaceOnly(oldPassword)){
    
    
            //输入的旧密码为空
            resultMap.put("result", "error");
        }else {
    
    
            String userPassword = ((User)o).getUserPassword();//已登录用户的现在密码
            //比对输入的旧密码和session中用户密码
            if (oldPassword.equals(userPassword))
                resultMap.put("result", "true");
            else
                resultMap.put("result", "false");
        }

        try {
    
    
            resp.setContentType("application/json");
            PrintWriter writer = resp.getWriter();
            //JSONArray 阿里巴巴的JSON工具类，将Map类转换为json（前端Ajax接受的是json格式）
            writer.write(JSONArray.toJSONString(resultMap));
            writer.flush();
            writer.close();
        }catch (IOException e){
    
    
            e.printStackTrace();
        }
    }
}

配合pwdmodify.js中的Ajax，看旧密码验证部分

oldpassword.on("blur",function(){
    
    
		$.ajax({
    
    
			type:"GET",
			url:path+"/jsp/user.do",
			data:{
    
    method:"pwdmodify",oldpassword:oldpassword.val()},
			dataType:"json",
			success:function(data){
    
    
				if(data.result == "true"){
    
    //旧密码正确
					validateTip(oldpassword.next(),{
    
    "color":"green"},imgYes,true);
				}else if(data.result == "false"){
    
    //旧密码输入不正确
					validateTip(oldpassword.next(),{
    
    "color":"red"},imgNo + " 原密码输入不正确",false);
				}else if(data.result == "sessionerror"){
    
    //当前用户session过期，请重新登录
					validateTip(oldpassword.next(),{
    
    "color":"red"},imgNo + " 当前用户session过期，请重新登录",false);
				}else if(data.result == "error"){
    
    //旧密码输入为空
					validateTip(oldpassword.next(),{
    
    "color":"red"},imgNo + " 请输入旧密码",false);
				}
			},
			error:function(data){
    
    
				//请求出错
				validateTip(oldpassword.next(),{
    
    "color":"red"},imgNo + " 请求错误",false);
			}
		});

5、注册UserServlet

<servlet>
    <servlet-name>UserServlet</servlet-name>
    <servlet-class>com.zcy.servlet.user.UserServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>UserServlet</servlet-name>
    <url-pattern>/jsp/user.do</url-pattern>
</servlet-mapping>

用户管理

先写 PageSupport.java 分页工具类

package com.zcy.util;

public class PageSupport {
    
    
	//当前页码-来自于用户输入
	private int currentPageNo = 1;
	
	//总数量（表）
	private int totalCount = 0;
	
	//页面容量
	private int pageSize = 0;
	
	//总页数-totalCount/pageSize（+1）
	private int totalPageCount = 1;

	public int getCurrentPageNo() {
    
    
		return currentPageNo;
	}

	public void setCurrentPageNo(int currentPageNo) {
    
    
		if(currentPageNo > 0){
    
    
			this.currentPageNo = currentPageNo;
		}
	}

	public int getTotalCount() {
    
    
		return totalCount;
	}

	public void setTotalCount(int totalCount) {
    
    
		if(totalCount > 0){
    
    
			this.totalCount = totalCount;
			//设置总页数
			this.setTotalPageCountByRs();
		}
	}
	public int getPageSize() {
    
    
		return pageSize;
	}

	public void setPageSize(int pageSize) {
    
    
		if(pageSize > 0){
    
    
			this.pageSize = pageSize;
		}
	}

	public int getTotalPageCount() {
    
    
		return totalPageCount;
	}

	public void setTotalPageCount(int totalPageCount) {
    
    
		this.totalPageCount = totalPageCount;
	}
	
	public void setTotalPageCountByRs(){
    
    
		if(this.totalCount % this.pageSize == 0){
    
    
			this.totalPageCount = this.totalCount / this.pageSize;
		}else if(this.totalCount % this.pageSize > 0){
    
    
			this.totalPageCount = this.totalCount / this.pageSize + 1;
		}else{
    
    
			this.totalPageCount = 0;
		}
	}
}

1、获取用户数量

1、UserDao.java添加方法

/**
* 根据用户名或角色类型 获取用户数量
* @param connection 连接参数
* @param userName 用户名
* @param userRole 用户角色类型
* @return 用户数量
*/
public int getUserCount(Connection connection, String userName, int userRole) throws SQLException;

 
2、UserDaoImpl.java添加方法

/**
     * 根据用户id和密码修改密码
     * @param connection 连接参数
     * @param userName 用户名
     * @param userRole 用户角色类型
     * @return 用户数量
     * @throws SQLException
     */
public int getUserCount(Connection connection, String userName, int userRole) throws SQLException {
    
    

        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        int count = 0;//这里用int更好，Integer不合适，因为count必定不为null

        if (connection != null){
    
    
            StringBuffer sql = new StringBuffer();
            sql.append("select count(1) as count from smbms_user u, smbms_role r where u.userRole = r.id");
            ArrayList<Object> list = new ArrayList<Object>();//存放参数

            if (!StringUtils.isNullOrEmpty(userName)){
    
    
                sql.append(" and u.userName like ?");
                list.add("%"+userName+"%");//like 模糊查询
            }
            //因为角色的值是 1 2 3
            if (userRole>0){
    
    
                sql.append(" and r.id = ?");
                list.add(userRole);
            }

            Object[] params = list.toArray();
            //输出完整SQL
            System.out.println("UserDaoImpl——>getUserCount："+sql.toString());
            preparedStatement = connection.prepareStatement(sql.toString());
            resultSet = BaseDao.query(connection, preparedStatement, params);

            if (resultSet.next())
                count = resultSet.getInt("count");
            BaseDao.closeResource(null, preparedStatement, resultSet);
        }

        return count;
    }

 
3、UserService.java添加方法

/**
     * 根据用户名或用户角色类型获取用户数量
     * @param userName 用户名
     * @param userRole 用户角色类型
     * @return 用户数量
     */
public int getUserCount(String userName, int userRole);

4、UserServiceImpl.java添加方法

/**
     * 根据用户名或用户角色类型获取用户数量
     * @param userName 用户名
     * @param userRole 用户角色类型
     * @return 用户数量
     */
    public int getUserCount(String userName, int userRole) {
    
    
        Connection connection = null;
        int count = 0;

        try {
    
    
            connection = BaseDao.getConnection();
            count = userDao.getUserCount(connection, userName, userRole);
        } catch (SQLException e) {
    
    
            e.printStackTrace();
        }finally {
    
    
            BaseDao.closeResource(connection, null, null);
        }
        return count;
    }

    @Test
    public void test(){
    
    
        UserServiceImpl userService = new UserServiceImpl();
        int userCount = userService.getUserCount(null, 3);
        System.out.println(userCount);
    }

2、获取用户列表

1、UserDao.java添加方法

/**
     * 通过条件查询
     * @param connection 连接参数
     * @param userName 用户名
     * @param userRole 用户角色
     * @param currentPageNo 当前页
     * @param pageSize 页面大小
     * @return 用户列表
     */
    public List<User> getUserList(Connection connection, String userName, int userRole,
            int currentPageNo, int pageSize) throws Exception;

 
2、UserDaoImpl.java添加方法

/**
     * 根据条件查询
     * @param connection 连接参数
     * @param userName 用户名
     * @param userRole 用户角色
     * @param currentPageNo 当前页
     * @param pageSize 页面大小
     * @return 用户列表
     * @throws Exception
     */
    public List<User> getUserList(Connection connection, String userName,int userRole,int currentPageNo, int pageSize)
            throws Exception {
    
    
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        List<User> userList = new ArrayList<User>();

        if(connection != null){
    
    
            StringBuffer sql = new StringBuffer();
            sql.append("select u.*, r.roleName as userRoleName from smbms_user u, smbms_role r where u.userRole = r.id");
            List<Object> list = new ArrayList<Object>();

            if(!StringUtils.isNullOrEmpty(userName)){
    
    
                sql.append(" and u.userName like ?");
                list.add("%"+userName+"%");
            }

            if(userRole > 0){
    
    
                sql.append(" and u.userRole = ?");
                list.add(userRole);
            }
            // 排序和分页
            // 分页：limit 开始下标, 页面大小
            // 假如每页3个数据，我想从第2页开始: 第一页 0 1 2, 第二页 3 4 5
            // 开始下标为 2 - 1 = 1, 1 * 3 = 3
            // limit 3, 3
            sql.append(" order by creationDate DESC limit ?,?");
            currentPageNo = (currentPageNo-1)*pageSize;
            list.add(currentPageNo);
            list.add(pageSize);

            Object[] params = list.toArray();
            System.out.println("UserDaoImpl——>getUserList:" + sql.toString());

            preparedStatement = connection.prepareStatement(sql.toString());
            resultSet = BaseDao.query(connection, preparedStatement, params);
            while(resultSet.next()){
    
    
                User user = new User();
                user.setId(resultSet.getInt("id"));
                user.setUserCode(resultSet.getString("userCode"));
                user.setUserName(resultSet.getString("userName"));
                user.setGender(resultSet.getInt("gender"));
                user.setBirthday(resultSet.getDate("birthday"));
                user.setPhone(resultSet.getString("phone"));
                user.setUserRole(resultSet.getInt("userRole"));
                user.setUserRoleName(resultSet.getString("userRoleName"));
                userList.add(user);
            }
            BaseDao.closeResource(null, preparedStatement, resultSet);
        }
        return userList;
    }

 
3、UserService.java添加方法

/**
     * 根据条件查询用户列表
     * @param userName 用户名
     * @param userRole 用户角色
     * @param currentPageNo 当前页号
     * @param pageSize 页面大小
     * @return 用户列表
     */
    public List<User> getUserList(String userName, int userRole, int currentPageNo, int pageSize);

 
4、UserServiceImpl.java添加方法

public List<User> getUserList(String userName, int userRole, int currentPageNo, int pageSize) {
    
    
        Connection connection = null;
        List<User> users = null;

        System.out.println("UserServiceImpl——>getUserList:");
        System.out.println("userName:"+userName);
        System.out.println("userRole:"+userRole);
        System.out.println("currentPageNo:"+currentPageNo);
        System.out.println("pageSize:"+pageSize);
        System.out.println("-------------------------------");

        try {
    
    
            connection = BaseDao.getConnection();
            userDao.getUserList(connection, userName, userRole, currentPageNo, pageSize);
        } catch (Exception e) {
    
    
            e.printStackTrace();
        }finally {
    
    
            BaseDao.closeResource(connection, null, null);
        }
        return null;
    }

3、获取角色列表

为了职责更好统一，把角色的操作放在另一个包里，和POJO类对应。

1、RoleDao.java

package com.zcy.dao.role;

import com.zcy.pojo.Role;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;

public interface RoleDao {
    
    
    /**
     * 角色列表是固定的，只有三个数据，系统管理员1、经理2、普通员工3
     * @param connection 连接参数
     * @return 角色列表
     */
    public List<Role> getRoleList(Connection connection) throws SQLException;
}

2、RoleDaoImpl.java

package com.zcy.dao.role;

import com.zcy.dao.BaseDao;
import com.zcy.pojo.Role;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class RoleDaoImpl implements RoleDao {
    
    


    public List<Role> getRoleList(Connection connection) throws SQLException {
    
    
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        ArrayList<Role> list = new ArrayList<Role>();
        if(connection != null){
    
    
            String sql = "select * from smbms_role";
            Object[] params = {
    
    };
            preparedStatement = connection.prepareStatement(sql);
            resultSet = BaseDao.query(connection, preparedStatement, params);
            while (resultSet.next()){
    
    
                Role role = new Role();
                role.setRoleName(resultSet.getString("roleName"));
                role.setId(resultSet.getInt("id"));
                role.setRoleCode(resultSet.getString("roleCode"));
                list.add(role);
            }
            BaseDao.closeResource(null, preparedStatement, resultSet);
        }
        return list;
    }
}

3、RoleService.java

package com.zcy.service.role;

import com.zcy.pojo.Role;

import java.util.List;

public interface RoleService {
    
    
    //获取角色列表
    public List<Role> getRoleList();
}

 
4、RoleServiceImpl.java

package com.zcy.service.role;

import com.zcy.dao.BaseDao;
import com.zcy.dao.role.RoleDao;
import com.zcy.dao.role.RoleDaoImpl;
import com.zcy.pojo.Role;

import java.awt.image.RasterOp;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;

public class RoleServiceImpl implements RoleService {
    
    
    //引入Dao
    private RoleDao roleDao;
    public RoleServiceImpl(){
    
    
        roleDao = new RoleDaoImpl();
    }

    public List<Role> getRoleList() {
    
    
        Connection connection = null;
        List<Role> roleList = null;

        try {
    
    
            connection = BaseDao.getConnection();
            roleList = roleDao.getRoleList(connection);
        } catch (SQLException e) {
    
    
            e.printStackTrace();
        }finally {
    
    
            BaseDao.closeResource(connection, null, null);
        }
        return roleList;
    }
}

 
5、显示前面的各种列表的Servlet

在UserServlet.java中增加方法 query

//反馈给前端 用户列表、角色列表、分页（重难点）
    public void query(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    
    
        //获取用户前端的数据
        String queryUserName = req.getParameter("queryname");
        String temp = req.getParameter("queryUserRole");
        String pageIndex = req.getParameter("pageIndex");
        int queryUserRole = 0;//角色类型在数据库整型的，默认0，不代表任何角色

        UserServiceImpl userService = new UserServiceImpl();
        RoleServiceImpl roleService = new RoleServiceImpl();
        int pageSize = 5;//默认页面大小显示5个数据
        int currentPageNo = 1;//默认当前页为第一页


        //判断请求是否需要执行，根据参数的值判断
        if (queryUserName == null){
    
    
            //请求中未包含用户名参数，角色名设置为空
            queryUserName = "";
        }
        if (!StringUtils.isNullOrEmpty(temp)){
    
    
            //请求包含了角色参数，将字符串转为整型
            queryUserRole = new Integer(temp);
        }
        if (pageIndex != null){
    
    
            //请求中包含页码，表明想看某一页数据，设置当前页为想看的那一页
            currentPageNo = Integer.parseInt(pageIndex);
        }

        // 3. 为了实现分页，需要计算出当前页面、总页面、页面大小

        int totalCount = userService.getUserCount(queryUserName, queryUserRole);//用户总数
        //总页数支持
        PageSupport pageSupport = new PageSupport();
        pageSupport.setCurrentPageNo(currentPageNo);
        pageSupport.setPageSize(pageSize);
        pageSupport.setTotalCount(totalCount);
        int totalPageCount = pageSupport.getTotalPageCount();//总页数

        //控制首页和尾页，如果页面要小于1或者大于总页数，则进行限制
        if (currentPageNo < 1)
            currentPageNo = 1;
        else if (currentPageNo > totalPageCount)
            currentPageNo = totalPageCount;

        //获得用户列表数据和角色数据列表
        List<User> userList = userService.getUserList(queryUserName, queryUserRole, currentPageNo, pageSize);
        List<Role> roleList = roleService.getRoleList();

        //将数据放入request
        req.setAttribute("userList", userList);
        req.setAttribute("roleList", roleList);
        req.setAttribute("totalCount", totalCount);
        req.setAttribute("currentPageNo", currentPageNo);
        req.setAttribute("totalPageCount", totalPageCount);
        req.setAttribute("queryUserName", queryUserName);
        req.setAttribute("queryUserRole", queryUserRole);

        //返回前端，用请求转发，因为数据放在request中
        req.getRequestDispatcher("userlist.jsp").forward(req, resp);
    }

 
同时，修改doGet里的程序

protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    
    
        //从前端获取参数，根据参数执行对应方法
        String method = req.getParameter("method");
        if (method!=null && method.equals("savepwd"))
            this.updatePassword(req,resp);
        else if (method!=null && method.equals("pwdmodify"))
            this.pwdModify(req, resp);
        else if (method!=null && method.equals("query")){
    
    
            this.query(req, resp);
        }
    }

4、添加用户

1、UserDao.java添加方法

/**
     * 增加一个用户
     * @param connection
     * @param user
     * @return 操作成功的行数
     */
    public int addUser(Connection connection, User user) throws SQLException;

 
2、UserDaoImpl.java添加方法

public int addUser(Connection connection, User user) throws SQLException {
    
    
        PreparedStatement preparedStatement = null;
        int updateRows = 0;

        if (connection != null){
    
    
            String sql = "insert into smbms_user" +
                    " (userCode, userName, userPassword, gender, birthday, phone, address, userRole, creationDate, createdBy)" +
                    "values (?,?,?,?,?,?,?,?,?,?)";
            preparedStatement = connection.prepareStatement(sql);
            Object[] params = {
    
    user.getUserCode(),user.getUserName(),user.getUserPassword(),
                    user.getGender(),user.getBirthday(),  user.getPhone(),user.getAddress(), user.getUserRole(),
                   user.getCreationDate(),user.getCreatedBy()};
            updateRows = BaseDao.update(connection, preparedStatement, params);
            BaseDao.closeResource(null, preparedStatement, null);
        }
        return updateRows;
    }

 
3、UserService.java添加方法

/**
     * 添加一个用户
     * @param user 用户对象
     * @return true 添加成功，false 添加失败
     */
    public boolean addUser(User user);

 
4、UserServiceImpl.java添加方法

/**
     * 添加一个用户
     * @param user 用户对象
     * @return true 添加成功，false 添加失败
     */
    public boolean addUser(User user) {
    
    
        Connection connection = null;
        boolean flag = false;
        try {
    
    
            connection = BaseDao.getConnection();
            connection.setAutoCommit(false);//关闭自动提交，开启事务管理
            int updateRows = userDao.addUser(connection, user);
            connection.commit();//提交
            if (updateRows > 0){
    
    
                flag = true;
                System.out.println("UserServiceImpl——>addUser:成功添加用户");
            }
            else
                System.out.println("UserServiceImpl——>addUser:添加用户失败");
        } catch (Exception e) {
    
    
            e.printStackTrace();
            try {
    
    
                connection.rollback();
                System.out.println("UserServiceImpl——>addUser:回滚");
            } catch (SQLException ex) {
    
    
                ex.printStackTrace();
            }
        }finally {
    
    
            //Service层关闭connection连接
            BaseDao.closeResource(connection, null, null);
        }
        return flag;
    }

 
5、UserServlet.java添加方法

//添加用户
    public void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
    
    
        String userCode = req.getParameter("userCode");
        String userName = req.getParameter("userName");
        String userPassword = req.getParameter("userPassword");
        String gender = req.getParameter("gender");
        String birthday = req.getParameter("birthday");
        String phone = req.getParameter("phone");
        String address = req.getParameter("address");
        String userRole = req.getParameter("userRole");

        User user = new User();
        user.setUserCode(userCode);
        user.setUserName(userName);
        user.setUserPassword(userPassword);
        user.setGender(Integer.parseInt(gender));
        try {
    
    
            user.setBirthday(new SimpleDateFormat("yyyy-MM-dd").parse(birthday));
        } catch (ParseException e) {
    
    
            e.printStackTrace();
        }
        user.setPhone(phone);
        user.setAddress(address);
        user.setUserRole(Integer.parseInt(userRole));
        user.setCreationDate(new Date());
        user.setCreatedBy(((User)req.getSession().getAttribute(Constants.USER_SESSION)).getId());

        UserServiceImpl userService = new UserServiceImpl();
        //添加成功，就直接重定向到查询页面显示数据；添加失败，则请求转发，重新添加。（请求转发能保留request的数据）
        if (userService.addUser(user))
            resp.sendRedirect(req.getContextPath()+"/jsp/user.do?method=query");
        else
            req.getRequestDispatcher("useradd.jsp").forward(req, resp);
    }

总结

项目的功能没有全部实现完，整个项目逻辑比较简单，主要是将之前学的巩固练手，其他的功能实现方法都是类似的。

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