SSM搭建(整合)+用户模块(登录和注销)实现

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听歌看文章：modify by 20180506

SSM框架的搭建环境(Spring,SpringMVC,Mybatis)

　　本文使用的是maven来构建的环境，开发工具是eclipse，tomcat用的是8，jdk版本1.8

用户模块流程

　　pom.xml -> web.xml -> entity (此处是User，与数据库中的字段名相同) -> UserDao -> UserDao.xml(这里是用的mybatis映射，直接动态实现dao接口的实现类) -> UserService -> UserServiceImpl -> UserController,这就是一个大体流程，下面开始详细介绍模块完成。路径图如下：

Maven中pom.xml文件

　　此处在pom.xml文件里每一块都有注释，已经解释的很清楚了，就不多说了。

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.imooc</groupId>
    <artifactId>userLogin</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <dependencies>
        <dependency>
            <!-- 使用junit4 用注解方式 -->
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <!-- 补全项目依赖 -->
        <!-- 1：日志 java日志：slf4j，log4j，logback，common-logging slf4j 是规范/接口 日志实现:log4j,logback,common-logging 
            使用：slf4j + logback -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.12</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>1.1.1</version>
        </dependency>
        <!-- 实现slf4j接口并整合 -->
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.1.1</version>
        </dependency>

        <!-- 2：数据库相关依赖 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.35</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>
        <!-- DAO框架：MyBatis依赖 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.3.0</version>
        </dependency>
        <!-- mybatis自身实现的spring整合依赖 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.2.3</version>
        </dependency>
        <!--:3：servlet web相关依赖 -->
        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
            <version>1.1.2</version>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.5.4</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
        </dependency>
        <!-- 4：spring依赖 -->
        <!-- 1)spring核心依赖 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>
        <!-- 2)spring dao层依赖 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>
        <!-- 3)spring web相关依赖 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>
        <!-- 4)spring test相关依赖 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>
    </dependencies>
    <build>
        <finalName>userLogin</finalName>
        <plugins>
            <!-- define the project compile level -->
            <!-- maven编译用的版本控制，控制jdk的版本不会回跳 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

配置web.xml

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
                      http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
  version="3.1"
  metadata-complete="true" >
    <!-- 修改servlet版本为3.1 -->

    <!-- 解决post的乱码 -->
    <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <!-- 初始化参数，设置编码为utf-8 -->
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- 配置DispatcherServlet -->
    <servlet>
        <servlet-name>userLogin</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 配置springMVC需要加载的配置文件
            spring-dao.xml,spring-service.xml,spring-web.xml
            Mybatis -> spring  -> springMVC
         -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/spring-*.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>userLogin</servlet-name> 
        <!-- 默认匹配所有的请求 -->  
        <url-pattern>/</url-pattern>
    </servlet-mapping>
  </web-app>

数据库与实体类(entity)

　　创建数据库，创建一张表，里面有id,username,password这三个属性,同时顺便给上值后面做测试好用，如下图所示：

　　创建实体类(entity)：

package com.sy.entity;

public class User {


    private String id;

    private String username;

    private String password;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
    .......

创建Dao层(UserDao)同时配置映射文件(UserDao.xml)

public interface UserDao {


    /**
     * 查找用户名和密码
     * @param username 登录用户名 
     * @param password 密码
     * @return
     */
    User findByUsername(String username);
}

Mybatis对应的映射文件(UserDao.xml):

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
    PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.sy.dao.UserDao">
    <!-- 目的：为DAO接口方法提供sql语句配置 -->
    <!-- 查询用户和密码进行登录 -->
    <select id="findByUsername" resultType="User" parameterType="String">

        select * from user where username = #{username}

    </select>
</mapper>

Spring整合UserDao(Mybaits)的配置文件

spring-dao.xml,注释写的很详细，每个配置都是做什么的，大家可以仔细看一下。

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xmlns:tx="http://www.springframework.org/schema/tx"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd">
    <!-- 配置整合mybatis过程 -->
    <!-- 1:配置数据库相关参数 properties的属性:${url}-->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <!-- 2:数据库连接池 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- 配置连接池属性 -->
        <property name="driverClass" value="${jdbc.driverClass}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>

        <!-- c3p0连接池的私有属性 -->
        <property name="maxPoolSize" value="30"></property>
        <property name="minPoolSize" value="10"></property>
        <!-- 关闭连接后不自动commit -->
        <property name="autoCommitOnClose" value="false"></property>
        <!-- 获取连接超时时间 -->
        <property name="checkoutTimeout" value="1000"></property>
        <!-- 当获取连接失败重试次数 -->
        <property name="acquireRetryAttempts" value="2"></property>
    </bean>

    <!-- 约定大于配置 -->
    <!-- 3:配置sqlsessionfactory对象 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"></property>
        <!-- 配置mybatis全局配置文件:mybatis-config.xml -->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        <!-- 扫描entity包 使用别名 com.sy.entity.User ->User -->
        <property name="typeAliasesPackage" value="com.sy.entity"></property>
        <!-- 扫描sql配置文件：mapping需要的xml文件 -->
        <property name="mapperLocations" value="classpath:mapper/*.xml"></property>
    </bean>

    <!-- 4：配置扫描Dao接口的包，动态实现Dao接口，注入到Spring容器中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 注入sqlsessionfactory -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
        <!-- 给出需要扫描的Dao接口包 -->
        <property name="basePackage" value="com.sy.dao"></property>
    </bean>
</beans>

UserService层接口及实现类的写法

//Service层接口
public interface UserService {

    //检验用户登录
    User checkLogin(String username,String password);

}

@Service
public class UserServiceImpl implements UserService{

    @Autowired
    private UserDao userDao;

    /* 
     * 检验用户登录业务
     * 
     */
    public User checkLogin(String username, String password) {

        User user = userDao.findByUsername(username);
        if(user != null && user.getPassword().equals(password)){

            return user;
        }
        return null;
    }
}

Spring整合Service层配置文件

　　当然这里我们没有用到事务，但是为了符合题目，SSM的整合，以后也是会用到事务的，可以如下配置一下

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xmlns:tx="http://www.springframework.org/schema/tx"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd">
    <!-- 扫描service包下所有使用注解的类型 -->
    <context:component-scan base-package="com.sy.service"/>

    <!-- 配置事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 注入数据库的连接池 -->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 配置基于注解的声明式事务
        默认使用注解来管理事务行为
     -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

Web(UserController)层的实现(SpringMVC)

每一个层级的方法我都写在注释中了

@Controller
@RequestMapping("/user")

//这里用了@SessionAttributes，可以直接把model中的user(也就key)放入其中
//这样保证了session中存在user这个对象
@SessionAttributes("user")
public class UserController {

    @Autowired
    private UserService userServivce;

    //正常访问login页面
    @RequestMapping("/login")
    public String login(){
        return "login";
    }

    //表单提交过来的路径
    @RequestMapping("/checkLogin")
    public String checkLogin(User user,Model model){
        //调用service方法
        user = userServivce.checkLogin(user.getUsername(), user.getPassword());
        //若有user则添加到model里并且跳转到成功页面
        if(user != null){
            model.addAttribute("user",user);
            return "success";
        }
        return "fail";
    }

    //测试超链接跳转到另一个页面是否可以取到session值
    @RequestMapping("/anotherpage")
    public String hrefpage(){

        return "anotherpage";
    }

    //注销方法
    @RequestMapping("/outLogin")
    public String outLogin(HttpSession session){
        //通过session.invalidata()方法来注销当前的session
        session.invalidate();
        return "login";
    }
}

Spring整合Controller层的配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xmlns:tx="http://www.springframework.org/schema/tx"
        xmlns:mvc="http://www.springframework.org/schema/mvc"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
        ">
    <!-- 配置springMVC -->
    <!-- 1：开启springMVC注解模式 -->
    <!-- 简化配置：
         (1)自动注册DefaultAnnotationHandlerMapping，AnnotationMethodHandlerAdapter
         (2)提供一系列：数据绑定，数字和日期的format  @NumberFormat,@DataTimeFormat
        xml,json默认读写支持
     -->
    <mvc:annotation-driven/>

    <!-- 2：配置jsp显示ViewResolver -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>
    <!-- 3：扫描web相关的bean -->
    <context:component-scan base-package="com.sy.controller" />
</beans>

JSP的写法

login.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>

    <form action="/userLogin/user/checkLogin" method="post">
        <table>
            <tr>
                <td>用户名:</td>
                <td><input id="username" name="username" type="text"></td>
            </tr>
            <tr>
                <td>密码:</td>
                <td><input id="password" name="password" type="password"></td>
            </tr>
            <tr>
                <td><input type="submit" value="登录"></td>
            </tr>
        </table>
    </form>
</body>
</html>

success.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>

    <div>
        <strong> welcome,${sessionScope.user.username}! </strong>
    </div>
    this is success page!

    <a href="/userLogin/user/anotherpage">点我跳到另一个页面</a>

    <form action="/userLogin/user/outLogin">
        <table>
            <tr>
                <td><input type="submit" value="退出登录"></td>
            </tr>
        </table>
    </form>
</body>
</html>

fail.jsp:

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
        u are loser,this is a fail page!
</body>
</html>

anotherpage.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>

    <div>
        <strong> ${sessionScope.user.username}!!!!! </strong>
    </div>
    <form action="/userLogin/user/outLogin">
        <table>
            <tr>
                <td><input type="submit" value="退出登录" ></td>
            </tr>
        </table>
    </form>
</body>
</html>

Demo效果图

Demo路径

我已经把这个demo传到我的github上了，需要的同学可以参考下，能star就star，希望不要fork，谢谢谢！~地址如下：

https://github.com/unlimitbladeworks/SSM-UerLogin

完