1SpringMVC+MyBaits实现查询所有

Posted 2020-07-21 红酒人生

1、创建如下所示项目

2、在src下的com.entity包下创建 Emp.java

 1 package com.entity;
 2 /**
 3  * 
 4  * @author Holly老师
 5  *
 6  */
 7 public class Emp {
 8    private Integer empno;
 9    private String ename;
10    private double sal;
11    private Integer deptno;
12    private String dname;
13    
14 public Integer getEmpno() {
15     return empno;
16 }
17 public void setEmpno(Integer empno) {
18     this.empno = empno;
19 }
20 public String getEname() {
21     return ename;
22 }
23 public void setEname(String ename) {
24     this.ename = ename;
25 }
26 public double getSal() {
27     return sal;
28 }
29 public void setSal(double sal) {
30     this.sal = sal;
31 }
32 public Integer getDeptno() {
33     return deptno;
34 }
35 public void setDeptno(Integer deptno) {
36     this.deptno = deptno;
37 }
38 public String getDname() {
39     return dname;
40 }
41 public void setDname(String dname) {
42     this.dname = dname;
43 }
44 @Override
45 public String toString() {
46     return "Emp [deptno=" + deptno + ", dname=" + dname + ", empno=" + empno
47             + ", ename=" + ename + ", sal=" + sal + "]";
48 }
49    
50 
51 }

Emp.java

3、在src下的com.mapper包下创建 EmpMapper.java

 1 package com.mapper;
 2 
 3 import java.util.List;
 4 
 5 import com.entity.Emp;
 6 /**
 7  * 
 8  * @author Holly老师
 9  *
10  */
11 public interface EmpMapper {
12     public List<Emp> findAll();
13 
14 }

EmpMapper.java

4、在src下的com.mapper包下创建 EmpMapper.xml

1 <?xml version="1.0" encoding="UTF-8"?>
2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
3 <mapper namespace="com.mapper.EmpMapper">
4   <select id="findAll" resultType="com.entity.Emp">
5     select e.empno,e.ename,e.sal,e.deptno,d.dname from emp e,dept d where e.deptno=d.deptno
6   </select>
7 </mapper>

EmpMapper.xml

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

 1 package com.service;
 2 
 3 import java.util.List;
 4 
 5 import com.entity.Emp;
 6 
 7 /**
 8  * 
 9  * @author Holly老师
10  *
11  */
12 public interface EmpService {
13     
14     List<Emp> findAll();
15 
16 }

EmpService.java

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

 1 package com.service.impl;
 2 
 3 import java.util.List;
 4 
 5 
 6 import javax.annotation.Resource;
 7 
 8 import org.springframework.stereotype.Service;
 9 import org.springframework.transaction.annotation.Transactional;
10 
11 import com.entity.Emp;
12 import com.mapper.EmpMapper;
13 import com.service.EmpService;
14 /**
15  * 
16  * @author Holly老师
17  *
18  */
19 @Service
20 @Transactional
21 public class EmpServiceImpl implements EmpService {
22     @Resource
23     private EmpMapper empMapper;
24 
25     public List<Emp> findAll() {
26        return empMapper.findAll();        
27     }
28 
29 }

EmpServiceImpl.java

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

 1 package com.controller;
 2 import java.util.List;
 3 import javax.annotation.Resource;
 4 import javax.servlet.http.HttpServletRequest;
 5 import javax.servlet.http.HttpServletResponse;
 6 import org.springframework.stereotype.Controller;
 7 import org.springframework.web.bind.annotation.RequestMapping;
 8 import com.entity.Emp;
 9 import com.service.impl.EmpServiceImpl;
10 /**
11  * 7.控制类
12  * @author pc
13  *
14  */
15 @Controller
16 public class EmpController {
17     @Resource
18     private EmpServiceImpl empServiceImpl;
19     //方法1
20     @RequestMapping("/findAll.do")
21     public String findAll(HttpServletRequest request,HttpServletResponse response){
22         List<Emp> list=empServiceImpl.findAll();
23         if(list!=null){
24             System.out.println("findAll success");
25             request.setAttribute("list", list);
26         }else{
27             System.out.println("findAll error");
28             
29         }
30         return "/index.jsp";
31     }
32     
33 
34 }

EmpController.java

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

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans" 
 3 xmlns:aop="http://www.springframework.org/schema/aop" 
 4 xmlns:context="http://www.springframework.org/schema/context" 
 5 xmlns:tx="http://www.springframework.org/schema/tx" 
 6 xmlns:mvc="http://www.springframework.org/schema/mvc" 
 7 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 8 xsi:schemaLocation="http://www.springframework.org/schema/beans 
 9 http://www.springframework.org/schema/beans/spring-beans.xsd
10 http://www.springframework.org/schema/aop
11 http://www.springframework.org/schema/aop/spring-aop.xsd
12 http://www.springframework.org/schema/context
13 http://www.springframework.org/schema/context/spring-context.xsd  
14 http://www.springframework.org/schema/tx
15 http://www.springframework.org/schema/tx/spring-tx.xsd    
16 http://www.springframework.org/schema/mvc
17 http://www.springframework.org/schema/mvc/spring-mvc.xsd  
18 ">
19 
20 <!-- 1.mvc支持注解 -->
21 <mvc:annotation-driven/>
22 
23 <!-- 2.全局扫描包资源 -->
24 <context:component-scan base-package="com"/>
25 
26 <!-- 3.驱动管理的数据源配置 -->
27 <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
28   <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/>
29   <property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:orcl"/>
30   <property name="username" value="scott"/>
31   <property name="password" value="tiger"/>
32 </bean>
33 
34 <!-- 4.配置数据源的事务 -->
35 <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
36   <property name="dataSource" ref="dataSource"/>
37 </bean>
38 
39 <!-- 5.配置sqlsession的bean工厂 -->
40 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
41   <property name="dataSource" ref="dataSource"/>
42   <property name="mapperLocations" value="classpath:com/mapper/EmpMapper.xml"/>
43 </bean>
44 
45 <!-- 6.spring和mybaits整合，自动扫映射输入参数 -->
46 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
47   <property name="basePackage" value="com.mapper"/>
48 </bean>
49 </beans>

springmvc-servlet.xml

9、在WebRoot下的WEB-INF下创建web.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app version="2.5" 
 3     xmlns="http://java.sun.com/xml/ns/javaee" 
 4     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 5     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
 6     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 7     <servlet>
 8       <servlet-name>springmvc</servlet-name>
 9       <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
10     </servlet>
11     <servlet-mapping>
12       <servlet-name>springmvc</servlet-name>
13       <url-pattern>*.do</url-pattern>
14     </servlet-mapping>
15     <filter>
16       <filter-name>CharacterEncodingFilter</filter-name>
17       <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
18       <init-param>
19         <param-name>encoding</param-name>
20         <param-value>UTF-8</param-value>
21       </init-param>
22     </filter>
23     <filter-mapping>
24      <filter-name>CharacterEncodingFilter</filter-name>
25       <url-pattern>/*</url-pattern>
26     </filter-mapping>
27   <welcome-file-list>
28     <welcome-file></welcome-file>
29   </welcome-file-list>
30 </web-app>

web.xml

10、在WebRoot下创建index.jsp

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
 3 <%
 4 String path = request.getContextPath();
 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 6 %>
 7 
 8 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 9 <html>
10   <head>
11     <base href="<%=basePath%>">
12     
13     <title>My JSP \'index.jsp\' starting page</title>
14     <meta http-equiv="pragma" content="no-cache">
15     <meta http-equiv="cache-control" content="no-cache">
16     <meta http-equiv="expires" content="0">    
17     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
18     <meta http-equiv="description" content="This is my page">
19     <!--
20     <link rel="stylesheet" type="text/css" href="styles.css">
21     -->
22   </head>
23   
24   <body>
25       <table>
26         <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>
27         <c:forEach var="i" items="${list}">
28         <tr><td>${i.empno }</td><td>${i.ename }</td><td>${i.sal }</td><td>${i.deptno }</td><td>${i.dname}</td></tr>
29         </c:forEach>
30        </table>
31       
32   </body>
33 </html>

index.jsp

11、运行效果如下