springMVC实现增删改查

首先需要准备好一张数据库表我这里用emp这张表：具体代码：

 /*
 SQLyog 企业版 - MySQL GUI v8.14
 MySQL - 5.1.73-community
 *********************************************************************
 */
 /*!40101 SET NAMES utf8 */;

 create table `emp` (
     `empno` double ,
     `ename` varchar (60),
     `job` varchar (60),
     `mgr` double ,
     `hiredate` varchar (60),
     `sal` float ,
     `comm` float ,
     `deptno` double
 );
 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('','SMITH','CLERK','','2018-10-28 10:22:37','','0.565','');
 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('','Allen','SALESMAN','','2018-10-28 10:22:37','','','');
 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('','Ward','SALESMAN','','2018-10-28 10:22:37','','','');
 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('','JONES','MANAGER','','2018-10-28 10:22:37','','','');
 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('','MARTIN','SALESMAN','','2018-10-28 10:22:37','','','');
 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('','CLARK','MANAGER','','2018-10-28 10:22:37','',NULL,'');
 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('','SCOTT','ANALYST','','2018-10-28 10:22:38','',NULL,'');
 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('','KING','PRESIDENT',NULL,'2018-10-28 10:22:38','',NULL,'');
 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('','TURNER','SALESMAN','','2018-10-28 10:22:38','','','');
 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('','ADAMS','CLERK','','2018-10-28 10:22:38','',NULL,'');
 insert into `emp` (`empno`, `ename`, `job`, `mgr`, `hiredate`, `sal`, `comm`, `deptno`) values('','FORD','ANALYST','','2018-10-28 10:22:38','',NULL,'');

然后开始我们的增删改查工作：

第一步：建立一个Maven项目，我们这里命名为"lianxicrud"，然后配置pom.xml：需要的jar包有：jstl，javax.servlet-api，spring-web，spring-webmvc，

spring-jdbc，mysql

 <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/maven-v4_0_0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>web01</groupId>
   <artifactId>lianxicrud</artifactId>
   <packaging>war</packaging>
   <version>0.0.1-SNAPSHOT</version>
   <name>lianxicrud Maven Webapp</name>
   <url>http://maven.apache.org</url>
   <dependencies>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>3.8.1</version>
       <scope>test</scope>
     </dependency>
     <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
     <dependency>
         <groupId>javax.servlet</groupId>
         <artifactId>jstl</artifactId>
         <version>1.2</version>
     </dependency>
     <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
     <dependency>
         <groupId>javax.servlet</groupId>
         <artifactId>javax.servlet-api</artifactId>
         <version>4.0.1</version>
         <scope>provided</scope>
     </dependency>
     <!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
     <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-web</artifactId>
         <version>5.0.8.RELEASE</version>
     </dependency>
     <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
     <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-webmvc</artifactId>
         <version>5.0.8.RELEASE</version>
     </dependency>
     <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
     <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-jdbc</artifactId>
         <version>5.0.8.RELEASE</version>
     </dependency>
     <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
     <dependency>
         <groupId>mysql</groupId>
         <artifactId>mysql-connector-java</artifactId>
         <version>5.1.47</version>
     </dependency>
   </dependencies>
   <build>
     <finalName>lianxicrud</finalName>
   </build>
 </project>

第二步：在WEB-INF下：建立springMVC-servlet.xml文件。配置springMVC-servlet.xml和WEB-INF下的web.xml

1.springMVC-servlet.xml：主要配置数据源，视图解析器，以及注册拦截器......

 <?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="controller" />
     <context:component-scan base-package="dao" />
     <context:component-scan base-package="biz" />
     <mvc:annotation-driven />
     <!-- 配置数据源 -->
     <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
         <property name="url" value="jdbc:mysql://localhost:3306/test" />
         <property name="driverClassName" value="com.mysql.jdbc.Driver" />
         <property name="username" value="root" />
         <property name="password" value="66668888ZH" />
     </bean>
     <!-- 类似于ps对象的一个内容 -->
     <bean id="jdbcTemplate"
         class="org.springframework.jdbc.core.JdbcTemplate">
         <property name="dataSource" ref="dataSource" />
     </bean>
     <!-- 视图解析器 -->
     <bean id="irvr"
         class="org.springframework.web.servlet.view.InternalResourceViewResolver">
         <property name="suffix" value=".jsp" />
         <property name="prefix" value="/user/" />
     </bean>
     <!-- 注册拦截器 -->
     <mvc:interceptors>
         <bean id="encode" class="interruptor.EncodeInterceptor"/>
     </mvc:interceptors>

 </beans>

web.xml:

 <!DOCTYPE web-app PUBLIC
  "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
  "http://java.sun.com/dtd/web-app_2_3.dtd" >

 <web-app>
   <display-name>Archetype Created Web Application</display-name>
   <servlet>
       <servlet-name>springMVC</servlet-name>
       <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
   </servlet>
   <servlet-mapping>
       <servlet-name>springMVC</servlet-name>
     <url-pattern>*.mvc</url-pattern>
   </servlet-mapping>
 </web-app>

第三步：编写bean，dao，biz，controller，以及处理字符编码集的interrupt

1.bean包：

package bean;

public class EmpBean {

    private Integer empNo;
    private String eName;
    private String job;
    private Integer mgr;
    private String hireDate;
    private Double sal;
    private Double comm;
    private Integer deptNo;
    public EmpBean() {
        // TODO Auto-generated constructor stub
    }
    public Integer getEmpNo() {
        return empNo;
    }
    public void setEmpNo(Integer empNo) {
        this.empNo = empNo;
    }
    public String geteName() {
        return eName;
    }
    public void seteName(String eName) {
        this.eName = eName;
    }
    public String getJob() {
        return job;
    }
    public void setJob(String job) {
        this.job = job;
    }
    public Integer getMgr() {
        return mgr;
    }
    public void setMgr(Integer mgr) {
        this.mgr = mgr;
    }
    public String getHireDate() {
        return hireDate;
    }
    public void setHireDate(String hireDate) {
        this.hireDate = hireDate;
    }
    public Double getSal() {
        return sal;
    }
    public void setSal(Double sal) {
        this.sal = sal;
    }
    public Double getComm() {
        return comm;
    }
    public void setComm(Double comm) {
        this.comm = comm;
    }
    public Integer getDeptNo() {
        return deptNo;
    }
    public void setDeptNo(Integer deptNo) {
        this.deptNo = deptNo;
    }
    @Override
    public String toString() {
        return "EmpBean [empNo=" + empNo + ", eName=" + eName + ", job=" + job + ", mgr=" + mgr + ", hireDate="
                + hireDate + ", sal=" + sal + ", comm=" + comm + ", deptNo=" + deptNo + "]";
    }

}

2.dao包：

 package dao;

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

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

 import bean.EmpBean;

 @Repository
 public class EmpDAO {

     @Autowired
     private JdbcTemplate jt;

     public void add(EmpBean eb) {
         String sql = "insert into emp values(null,?,?,?,?,?,?,?)";
         jt.update(sql, eb.geteName(),eb.getJob(),eb.getMgr(),eb.getHireDate(),eb.getSal(),eb.getComm(),eb.getDeptNo());
     } 

     public void delete(int empNo) {
         String sql = "delete from emp where empno = ?";
         jt.update(sql,empNo);
     }

     public void update(EmpBean eb) {
         String sql = "update emp set ename=?,job=？，mgr=?,hiredate=?,sal=?,comm=?,daptno=? where empno=?";
         jt.update(sql,eb.geteName(),eb.getJob(),eb.getMgr(),eb.getHireDate(),eb.getSal(),eb.getComm(),eb.getDeptNo(),eb.getEmpNo());
     }

     public List<EmpBean>findAll(){
         String sql = "select * from emp";
         return jt.query(sql, new RowMapperImpl());
     }

     public EmpBean findById(int empNo) {
         String sql = "select * from emp where empNo ='" + empNo +  "'";
         return jt.query(sql, new RowMapperImpl()).get(0);
     }
 }

 class RowMapperImpl implements RowMapper<EmpBean>{
     //对象关系映射（ORM）,将查询出来的结果映射成类的属性
     @Override
     public EmpBean mapRow(ResultSet rs, int rowNum) throws SQLException {
         EmpBean eb = new EmpBean();
         eb.setEmpNo(rs.getInt(1));
         eb.seteName(rs.getString(2));
         eb.setJob(rs.getString(3));
         eb.setMgr(rs.getInt(4));
         eb.setHireDate(rs.getString(5));
         eb.setSal(rs.getDouble(6));
         eb.setComm(rs.getDouble(7));
         eb.setDeptNo(rs.getInt(8));
         return eb;
     }
 }

3.biz包：

 package biz;

 import java.util.List;

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;

 import bean.EmpBean;
 import dao.EmpDAO;

 @Service
 public class EmpBiz {

     @Autowired
     private EmpDAO edao;
     public void add(EmpBean eb) {
         edao.add(eb);
     }

     public void delete(int empNo) {
         edao.delete(empNo);
     }

     public void update(EmpBean eb) {
         edao.update(eb);
     }

     public List<EmpBean>findAll(){
         return edao.findAll();
     }

     public EmpBean findById(int empNo) {
         return edao.findById(empNo);
     }
 }
     

4.controller包：

 package controller;

 import javax.servlet.http.HttpServletRequest;

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;

 import bean.EmpBean;
 import biz.EmpBiz;

 @Controller
 @RequestMapping("/emp")
 public class EmpController {
     @Autowired
     private EmpBiz eb;
     @RequestMapping("/add")
     public String add(EmpBean emp) {
         eb.add(emp);
         return "redirect:../index.jsp";
     }

     @RequestMapping("/find")
     public String findAll(HttpServletRequest request) {
         request.getSession().setAttribute("ALLEMP",eb.findAll());
         return "redirect:../index.jsp";
     }

     @RequestMapping("/delete")
     public String delete(int empNo) {
         eb.delete(empNo);
         return "redirect:../index.jsp";
     }

     @RequestMapping("/findbyid")
     public String findById(int empNo , HttpServletRequest request) {
         request.getSession().setAttribute("EMPBEAN", eb.findById(empNo));
         System.out.println("11111");
         return "redirect:../update.jsp";
     }

     @RequestMapping("/update")
     public String update(EmpBean emp) {
         eb.update(emp);
         System.out.println("22222222");
         return "redirect:../index.jsp";
     }
 }

interrupt包：

 package interruptor;

 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

 import org.springframework.web.servlet.HandlerInterceptor;
 import org.springframework.web.servlet.ModelAndView;

 //建立一个拦截器（类似于Filter）
 public class EncodeInterceptor implements HandlerInterceptor{

     @Override
     public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
             throws Exception {
     }

     @Override
     public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
             ModelAndView modelAndView) throws Exception {
     }
     @Override
     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
             throws Exception {
         //针对post请求的编码集操作
         request.setCharacterEncoding("utf-8");
         response.setCharacterEncoding("utf-8");
         return true;
     }

 }

第四步：页面处理（为了方便index.jsp只查了这张表的姓名和员工编号，如果想显示更多可以进行查询，方法雷同）这里一定要注意加上isELIgnored="false",不然查不出来，下午找了一下午错误，原来忘了加这句话，哈哈

1.index.jsp：

 <%@ page language="java" pageEncoding="utf-8" isELIgnored="false" %>
 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
 <html>
 <body>
     <c:if test="${empty ALLEMP}">
         <c:redirect url="emp/find.mvc"/>
     </c:if>

     <c:forEach var="ei" items="${ALLEMP}">
         ${ei.empNo}  ${ei.eName}
         <a href="emp/delete.mvc?empNo=${ei.empNo }">删除</a>
         <a href="emp/findbyid.mvc?empNo=${ei.empNo }">修改</a>
         <br/>
     </c:forEach>
 </body>
 </html>

2.注册新员工页面：add.jsp：

 <%@ page language="java" pageEncoding="utf-8" isELIgnored="false"%>
 <html>
 <head>
 <title>注册新员工</title>
 <style type="text/css">
     table {
             margin: 0 auto;
             border: 1px  gray solid;
             width: 70%;
     }
     td,th{
             border: 1px gray solid;
     }
 </style>
 </head>
 <body>
     <form action="emp/add.mvc" method="post">
         <table>
             <tr>
                     <h2 align="center">公司员工注册表</h2>
             </tr>
             <tr>
                 <th>姓名</th>
                 <td>
                     <input type="text" name="eName"/>
                 </td>
             </tr>
             <tr>
                 <th>职位</th>
                 <td>
                     <input type="text" name="job"/>
                 </td>
             </tr>
             <tr>
                 <th>上司</th>
                 <td>
                     <input type="text" name="mgr"/>
                 </td>
             </tr>
             <tr>
                 <th>入职时间</th>
                 <td>
                     <input type="text" name="hireDate"/>
                 </td>
             </tr>
             <tr>
                 <th>薪资</th>
                 <td>
                     <input type="text" name="sal"/>
                 </td>
             </tr>
             <tr>
                 <th>奖金</th>
                 <td>
                     <input type="text" name="comm"/>
                 </td>
             </tr>
             <tr>
                 <th>部门</th>
                 <td>
                     <input type="text" name="deptNo"/>
                 </td>
             </tr>
             <tr>
                 <th colspan="1">
                     <input type="submit" values = "注册新员工"/>
                 </th>
             </tr>
         </table>
     </form>
 </body>
 </html>

3.修改页面：update.jsp：

 <%@ page language="java"  pageEncoding="utf-8" isELIgnored="false"%>
 <html>
 <head>
 <title>修改员工信息</title>
 <style type="text/css">
 table {
     margin: 0 auto;
     border: 1px gray solid;
     width: 70%;
 }
 td,th{
     border: 1px gray solid;
 }
 </style>

 </head>
 <body>     <form action="emp/update.mvc" method="post">
         <input type="hidden" name="empNo" value="${EMPBEAN.empNo }"/>
         <table>
             <tr>
                 <h2 align="center">修改员工信息</h2>
             </tr>
             <tr>
                 <th>姓名</th>
                 <td>
                     <input type="text" name="eName" value="${EMPBEAN.eName }"/>
                 </td>
             </tr>
             <tr>
                 <th>职位</th>
                 <td>
                     <input type="text" name="job" value="${EMPBEAN.job }"/>
                 </td>
             </tr>
             <tr>
                 <th>上司</th>
                 <td>
                     <input type="text" name="mgr" value="${EMPBEAN.mgr }"/>
                 </td>
             </tr>
             <tr>
                 <th>入职时间</th>
                 <td>
                     <input type="text" name="hireDate" value="${EMPBEAN.hireDate }"/>
                 </td>
             </tr>
             <tr>
                 <th>薪金</th>
                 <td>
                     <input type="text" name="sal" value="${EMPBEAN.sal }"/>
                 </td>
             </tr>
             <tr>
                 <th>奖金</th>
                 <td>
                     <input type="text" name="comm" value="${EMPBEAN.comm }"/>
                 </td>
             </tr>
             <tr>
                 <th>部门</th>
                 <td>
                     <input type="text" name="daptNo" value="${EMPBEAN.deptNo }"/>
                 </td>
             </tr>
             <tr>
                 <th colspan="2">
                     <input type="submit" value="提交修改信息"/>
                 </th>
             </tr>
         </table>
     </form>

 </body>
 </html>

以上四大步就是SpringMVC实现增删改查的具体操作。

下面我们来进行测试：

1.首先我们启动我们的服务器，然后访问我们的index.jsp页面（查找测试）：

2.访问add.jsp:并且填入新员工的信息（增加测试）：

点击提交：

小仙女添加进来了

然后点击修改进行修改测试：我们把小仙女改成老仙女

修改完成。

然后点击老仙女的删除（删除测试）

删除成功。

其实这个还可以加入BootStrap将页面进行美化操作