1、SpringMVC+MyBaits实现查询所有

1、创建如下所示项目

2、在src下的com.entity包下创建 Emp.java

 package com.entity;
 /**
  *
  * @author Holly老师
  *
  */
 public class Emp {
    private Integer empno;
    private String ename;
    private double sal;
    private Integer deptno;
    private String dname;

 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 double getSal() {
     return sal;
 }
 public void setSal(double sal) {
     this.sal = sal;
 }
 public Integer getDeptno() {
     return deptno;
 }
 public void setDeptno(Integer deptno) {
     this.deptno = deptno;
 }
 public String getDname() {
     return dname;
 }
 public void setDname(String dname) {
     this.dname = dname;
 }
 @Override
 public String toString() {
     return "Emp [deptno=" + deptno + ", dname=" + dname + ", empno=" + empno
             + ", ename=" + ename + ", sal=" + sal + "]";
 }

 }

Emp.java

3、在src下的com.mapper包下创建 EmpMapper.java

 package com.mapper;

 import java.util.List;

 import com.entity.Emp;
 /**
  *
  * @author Holly老师
  *
  */
 public interface EmpMapper {
     public List<Emp> findAll();

 }

EmpMapper.java

4、在src下的com.mapper包下创建 EmpMapper.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.mapper.EmpMapper">
   <select id="findAll" resultType="com.entity.Emp">
     select e.empno,e.ename,e.sal,e.deptno,d.dname from emp e,dept d where e.deptno=d.deptno
   </select>
 </mapper>

EmpMapper.xml

5、在src下的com.service包下创建 EmpService.java

 package com.service;

 import java.util.List;

 import com.entity.Emp;

 /**
  *
  * @author Holly老师
  *
  */
 public interface EmpService {

     List<Emp> findAll();

 }

EmpService.java

6、在src下的com.service.impl包下创建EmpServiceImpl.java

 package com.service.impl;

 import java.util.List;

 import javax.annotation.Resource;

 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;

 import com.entity.Emp;
 import com.mapper.EmpMapper;
 import com.service.EmpService;
 /**
  *
  * @author Holly老师
  *
  */
 @Service
 @Transactional
 public class EmpServiceImpl implements EmpService {
     @Resource
     private EmpMapper empMapper;

     public List<Emp> findAll() {
        return empMapper.findAll();
     }

 }

EmpServiceImpl.java

7、在com.controller包下创建EmpController.java

 package com.controller;
 import java.util.List;
 import javax.annotation.Resource;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
 import com.entity.Emp;
 import com.service.impl.EmpServiceImpl;
 /**
  * 7.控制类
  * @author pc
  *
  */
 @Controller
 public class EmpController {
     @Resource
     private EmpServiceImpl empServiceImpl;
     //方法1
     @RequestMapping("/findAll.do")
     public String findAll(HttpServletRequest request,HttpServletResponse response){
         List<Emp> list=empServiceImpl.findAll();
         if(list!=null){
             System.out.println("findAll success");
             request.setAttribute("list", list);
         }else{
             System.out.println("findAll error");

         }
         return "/index.jsp";
     }

 }

EmpController.java

8、在WebRoot下的WEB-INF下创建springmvc-servlet.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:aop="http://www.springframework.org/schema/aop"
 xmlns:context="http://www.springframework.org/schema/context"
 xmlns:tx="http://www.springframework.org/schema/tx"
 xmlns:mvc="http://www.springframework.org/schema/mvc"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
 http://www.springframework.org/schema/beans/spring-beans.xsd
 http://www.springframework.org/schema/aop
 http://www.springframework.org/schema/aop/spring-aop.xsd
 http://www.springframework.org/schema/context
 http://www.springframework.org/schema/context/spring-context.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.xsd
 ">

 <!-- 1.mvc支持注解 -->
 <mvc:annotation-driven/>

 <!-- 2.全局扫描包资源 -->
 <context:component-scan base-package="com"/>

 <!-- 3.驱动管理的数据源配置 -->
 <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
   <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/>
   <property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:orcl"/>
   <property name="username" value="scott"/>
   <property name="password" value="tiger"/>
 </bean>

 <!-- 4.配置数据源的事务 -->
 <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
   <property name="dataSource" ref="dataSource"/>
 </bean>

 <!-- 5.配置sqlsession的bean工厂 -->
 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
   <property name="dataSource" ref="dataSource"/>
   <property name="mapperLocations" value="classpath:com/mapper/EmpMapper.xml"/>
 </bean>

 <!-- 6.spring和mybaits整合，自动扫映射输入参数 -->
 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
   <property name="basePackage" value="com.mapper"/>
 </bean>
 </beans>

springmvc-servlet.xml

9、在WebRoot下的WEB-INF下创建web.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <web-app version="2.5"
     xmlns="http://java.sun.com/xml/ns/javaee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
     <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>*.do</url-pattern>
     </servlet-mapping>
     <filter>
       <filter-name>CharacterEncodingFilter</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>
     </filter>
     <filter-mapping>
      <filter-name>CharacterEncodingFilter</filter-name>
       <url-pattern>/*</url-pattern>
     </filter-mapping>
   <welcome-file-list>
     <welcome-file></welcome-file>
   </welcome-file-list>
 </web-app>

web.xml

10、在WebRoot下创建index.jsp

 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
 <%
 String path = request.getContextPath();
 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 %>

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
   <head>
     <base href="<%=basePath%>">

     <title>My JSP 'index.jsp' starting page</title>
     <meta http-equiv="pragma" content="no-cache">
     <meta http-equiv="cache-control" content="no-cache">
     <meta http-equiv="expires" content="0">
     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
     <meta http-equiv="description" content="This is my page">
     <!--
     <link rel="stylesheet" type="text/css" href="styles.css">
     -->
   </head>

   <body>
       <table>
         <tr><td>员工编号</td><td>员工姓名</td><td>工资</td><td>部门编号</td><td>部门名称</td></tr>
         <c:forEach var="i" items="${list}">
         <tr><td>${i.empno }</td><td>${i.ename }</td><td>${i.sal }</td><td>${i.deptno }</td><td>${i.dname}</td></tr>
         </c:forEach>
        </table>

   </body>
 </html>

index.jsp

11、运行效果如下