SpringMVC 增删改查实例

MVC布局格式:
1.MVC包的创建格式

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2.创建实体类

package cn.ps.entity;

import org.hibernate.validator.constraints.NotBlank;

import javax.validation.constraints.DecimalMax;
import javax.validation.constraints.DecimalMin;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Size;

public class MySqlUser {
   private int id;
   @NotBlank(message = "学生姓名不能为空")
   private String name;
   @DecimalMin(value="1",message = "年龄不能小于1岁")
   @DecimalMax(value="130",message = "年龄最大为130岁")
   private String age;
   private String sex;
   @Pattern(regexp = ".+@.+\\..+",message = "邮箱格式错误")
   private String eamil;
   @Size(max = 11,min = 11,message = "手机号码必须为11位数")
   private String phone;
   public int getId() {
       return id;
   }
   public void setId(int id) {
       this.id = id;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public String getSex() {
       return sex;
   }
   public void setSex(String sex) {
       this.sex = sex;
   }
   public String getAge() {
       return age;
   }

   public void setAge(String age) {
       this.age = age;
   }

   public String getEamil() {
       return eamil;
   }

   public void setEamil(String eamil) {
       this.eamil = eamil;
   }

   public String getPhone() {
       return phone;
   }

   public void setPhone(String phone) {
       this.phone = phone;
   }

}

3.配置XML文件和资源文件

web.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<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_4_0.xsd"
version="4.0">

<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<filter>
<filter-name>fgf</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>

<init-param>
<param-name>forceRequestEncoding</param-name>
<param-value>true</param-value>
</init-param>

<init-param>
<param-name>forceResponseEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>fgf</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<filter>
<filter-name>httpFile</filter-name>
<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>httpFile</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<servlet>
<servlet-name>DispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/springweb.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>DispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

</web-app>

springweb.xml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: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/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
">
<context:component-scan base-package="cn"></context:component-scan>
<context:property-placeholder location="classpath:/jdbc.properties"/>

<mvc:annotation-driven></mvc:annotation-driven>
<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
<property name="driverClassName" value="${jdbcDriver}"></property>
<property name="url" value="${jdbcUrl}"></property>
<property name="username" value="${jdbcUsername}"></property>
<property name="password" value="${jdbcPassword}"></property>
</bean>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"></property>
</bean>
</beans>

pom.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<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>cn.ps</groupId>
<artifactId>SpringMVCRest</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.3.20.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.3.19.RELEASE</version>
</dependency>
<dependency>
<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
<version>2.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.39</version>
</dependency>

<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-dbcp2</artifactId>
<version>2.5.0</version>
</dependency>

<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>

<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>5.3.6.Final</version>
</dependency>

</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
<configuration>
<uriEncoding>UTF-8</uriEncoding>
</configuration>
</plugin>
</plugins>
</build>

</project>

4.数据的提取和业务的逻辑控制

控制层
package cn.ps.coutroller;

import cn.ps.entity.MySqlUser;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import cn.ps.service.EmpService;
import cn.ps.utils.PagerBean;
import org.springframework.ui.ModelMap;
import org.springframework.validation.Errors;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.validation.Valid;

@Controller
public class DataCoutroller {
@Autowired
private EmpService service;

   /**
   * 多条件搜索
   * 传参 /emps?stu=1&curPage=2&pageNum=3
   * @param stu
   * @param curPage
   * @param pageNum
   * @param map
   * @return
   */
   @RequestMapping(value = "/emps",method = RequestMethod.GET)
   public String listEmp(String stu, String curPage, String pageNum, ModelMap map) {
       try {
           PagerBean<MySqlUser> pb=service.queryClass(stu,curPage,pageNum);
           map.put("pb",pb);
           return "/showemp.jsp";
       } catch (Exception e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
       return null;
   }
@RequestMapping(value = "/emp",method = RequestMethod.POST)
public String addEmp(@Valid MySqlUser emp, Errors er, ModelMap map) {
           if(er.hasErrors()){
               return "/add.jsp";
           }
service.addEmp(emp);
return listEmp(null,null,null,map);
}
   @RequestMapping(value = "/emp/{id}",method = RequestMethod.PUT)
   public String updateEmp(@PathVariable String id,@Valid MySqlUser emp, Errors er, ModelMap map) {
       emp.setId(Integer.parseInt(id));
       if(er.hasErrors()){
           map.addAttribute("id",id);
           return "/update.jsp";
       }
       service.updateEmp(emp);
       return listEmp(null,null,null,map);
   }
   @RequestMapping(value = "/emp/{id}",method = RequestMethod.DELETE)
   public String deleteEmp(@PathVariable String id, ModelMap map) {
       service.deleteEmp(id);
       return listEmp(null,null,null,map);
   }
}

dao层（数据层）
package cn.ps.dao.impl;

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

import com.mysql.jdbc.StringUtils;

import cn.ps.dao.EmpDao;
import cn.ps.entity.MySqlUser;

@Repository
public class EmpDaoImpl implements EmpDao {
   @Autowired
   private JdbcTemplate jdbcTemplate;
   public int countEmp(String name) throws SQLException {
       String sql="SELECT count(*) as myCount FROM stu1";
       if(!StringUtils.isNullOrEmpty(name)) {
           sql+=" where name like '%"+name+"%'";
       }
       Map map =jdbcTemplate.queryForMap(sql);
       return Integer.parseInt(map.get("myCount").toString());
   }

   public List<MySqlUser> queryClass(String name,int startIndex,int pageNum) throws Exception {
       String sql="SELECT * FROM stu1";
       if(!StringUtils.isNullOrEmpty(name)) {
           sql+=" where name like '%"+name+"%'";
       }
       sql+=" limit "+startIndex+","+pageNum;
       List<MySqlUser> list=jdbcTemplate.query(sql,new BeanPropertyRowMapper<MySqlUser>(MySqlUser.class));
       return list;
   }
   public void addEmp(MySqlUser emp) {
       String sql="insert into stu1(name,age,eamil,sex,phone) values(?,?,?,?,?)";
       jdbcTemplate.update(sql,emp.getName(),emp.getAge(),emp.getEamil(),emp.getSex(),emp.getPhone());
   }

   public void deleteEmp(String id) {
       String sql="delete from stu1 where id=?";
       jdbcTemplate.update(sql,id);
   }

   public void updateEmp(MySqlUser emp) {
       String sql="update stu1 set name=?,age=?,eamil=?,sex=?,phone=? where id=?";
       jdbcTemplate.update(sql,emp.getName(),emp.getAge(),emp.getEamil(),emp.getSex(),emp.getPhone(),emp.getId());
   }

}

Service层（服务层）
package cn.ps.service.impl;
import java.util.List;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import cn.ps.dao.EmpDao;

import cn.ps.entity.MySqlUser;
import cn.ps.service.EmpService;
import cn.ps.utils.PagerBean;
@Service
public class EmpServiceImpl implements EmpService {
   @Autowired
   private EmpDao dao;
   public PagerBean<MySqlUser> queryClass(String name,String curPage,String pageNum) throws Exception{
       //第一次访问没有当前页
       if(StringUtils.isEmpty(curPage)) {
           curPage="1";
       }
       if(StringUtils.isEmpty(pageNum)) {
           pageNum="10";
       }

       //转换成int类型
       int curPageIn=Integer.parseInt(curPage);
       int pageNumIn=Integer.parseInt(pageNum);
       int total=dao.countEmp(name);
       PagerBean<MySqlUser> pd=new PagerBean<MySqlUser>(curPageIn, pageNumIn, total);
       List<MySqlUser> queryClass=dao.queryClass(name,pd.getStartIndex(),pd.getPageNum());
       pd.setData(queryClass);
       return pd;
   }

   public void addEmp(MySqlUser emp) {
       dao.addEmp(emp);
   }

   public void deleteEmp(String id) {
       dao.deleteEmp(id);
   }

   public void updateEmp(MySqlUser emp) {
       dao.updateEmp(emp);
   }

}

```java
查询 jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<!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>
<style type="text/css">
   table{
       border-collapse: collapse;
   }
   th{
       border: 1px solid #ccc;

   }
   td{
       border: 1px solid #ccc;
   }

</style>
</head>
<body>
   <form action="${pageContext.request.contextPath}/emps">
       学生姓名:<input type="text" name='stu'><input type="submit" value="查询">
<input type="button" value="新增" onclick="window.location='${pageContext.request.contextPath}/add.jsp'">
   </form>
   <table style="width:80%">
       <tr>
           <td>id</td>
           <td>学生姓名</td>
           <td>年龄</td>
<td>邮箱</td>
           <td>性别</td>
<td>手机号码</td>
           <td>操作</td>
       </tr>
   <c:forEach var="tt" items="${requestScope.pb.data}">
       <tr>
           <td>${tt.id}</td>
           <td>${tt.name}</td>
           <td>${tt.age}</td>
<td>${tt.eamil}</td>
<td>${tt.sex}</td>
<td>${tt.phone}</td>
           <td><form action="${pageContext.request.contextPath}/emp/${tt.id}" method="post">
               <input type="hidden" name="_method" value="delete"/>
               <input type="submit" value="删除"/> 
               <input type="button" value="修改"onclick="window.location='${pageContext.request.contextPath}/update.jsp?id=${tt.id}&name=${tt.name}&age=${tt.age}&eamil=${tt.eamil}&sex=${tt.sex}&phone=${tt.phone}'"/>

           </form>
           </td>
       </tr>
   </c:forEach>
   </table>
   <a href="${pageContext.request.contextPath}/emps?curPage=${requestScope.pb.prePage}&stu=${param.stu}">上一页</a>
   <c:forEach var="i" begin="1" end="${requestScope.pb.totalPage}" step="1">
       <a href="emps?curPage=${i}">${i}</a>
   </c:forEach>
   当前页是:${requestScope.pb.curPage} 总页数是:${requestScope.pb.totalPage} 总条数是:${requestScope.pb.total}
   <a href="${pageContext.request.contextPath}/emps?curPage=${requestScope.pb.nextPage}&stu=${param.stu}">下一页</a>
</body>
</html>

SpringMVC 增删改查实例

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