Day44——SSM整合实例——显示所有员工信息列表

心已赠人 2023-07-05 05:25 21阅读 0赞

# 一. 回顾 #

前面[Day43——SSM整合前需要注意的事项、整合步骤][Day43_SSM]讲到了ssm整合的注意事项以及步骤，今天用实例把ssm整合出来，显示所有员工信息列表

### [前往免费下载源码][Link 1] ###

# 二. 例子 #

*  设计的表如下：两个表的主键都自增。tbl\_employee中的d\_id引用tbl\_dept的id，外键引用，如下：  
    ![在这里插入图片描述][2020021313073443.PNG]  
    ![在这里插入图片描述][20200213130740490.PNG]
 *  插入数据  
    ![在这里插入图片描述][20200213131828701.PNG]  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjM0ODQ2_size_16_color_FFFFFF_t_70]
 *  导入jar包，项目的目录结构如下：  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjM0ODQ2_size_16_color_FFFFFF_t_70 1]  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjM0ODQ2_size_16_color_FFFFFF_t_70 2]
 *  搭建Spring与Springmvc的环境

web.xml

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
    
        
        <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>
        
        
        <filter>
            <filter-name>HiddenHttpMethodFilter</filter-name>
            <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
        </filter>
        <filter-mapping>
            <filter-name>HiddenHttpMethodFilter</filter-name>
            <url-pattern>/*</url-pattern>
        </filter-mapping>
        
        
        
        
    	<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>
        
        
        
    
    	<servlet>
    		<servlet-name>springDispatcherServlet</servlet-name>
    		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    		<init-param>
    			<param-name>contextConfigLocation</param-name>
    			<param-value>classpath:springmvc.xml</param-value>
    		</init-param>
    		<load-on-startup>1</load-on-startup>
    	</servlet>
    
    	
    	<servlet-mapping>
    		<servlet-name>springDispatcherServlet</servlet-name>
    		<url-pattern>/</url-pattern>
    	</servlet-mapping>
    
    </web-app>

springmvc.xml

spring.xml

<?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:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring" xsi:schemaLocation="http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring-1.2.xsd 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-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">
    
        
        <context:component-scan base-package="com.atguigu.ssm">
            <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
        </context:component-scan>
        
        
        <context:property-placeholder location="classpath:db.properties"/>
        <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
            <property name="driverClass" value="${jdbc.driver}"></property>
            <property name="jdbcUrl" value="${jdbc.url}"></property>
            <property name="user" value="${jdbc.username}"></property>
            <property name="password" value="${jdbc.password}"></property>
        </bean>
        
        
        <bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
           <property name="dataSource" ref="dataSource"></property>   
        </bean>
        <tx:annotation-driven transaction-manager="dataSourceTransactionManager"/>
           
        
        
        
         <bean class="org.mybatis.spring.SqlSessionFactoryBean">
            
            <property name="dataSource" ref="dataSource"></property>
            
            <property name="configLocation" value="classpath:mybatis-config.xml"></property>
            
            
            <property name="typeAliasesPackage" value="com.atguigu.ssm.beans"></property>
            
            <property name="mapperLocations" value="classpath:mybatis/mapper/*.xml"></property>
         </bean>
    
         
         <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
             <property name="basePackage" value="com.atguigu.ssm.mapper"></property>
         </bean>
         
       
    
    </beans>

*  搭建MyBatis的环境

EmployeeMapper.java

package com.atguigu.ssm.mapper;
    
    import java.util.List;
    
    import com.atguigu.ssm.beans.Employee;
    
    public interface EmployeeMapper { 
    
    	public List<Employee> selectAllEmps();
    	
    }

EmployeeMapper.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.atguigu.ssm.mapper.EmployeeMapper">
    	
    	
    	<select id="selectAllEmps" resultMap="myEmpsAndDept">
             select e.id eid, e.last_name, e.email, e.gender, d.id did, d.dept_name	     
    	     from tbl_employee e, tbl_dept d
    	     where e.d_id = d.id
    	</select>
    	<resultMap type="com.atguigu.ssm.beans.Employee" id="myEmpsAndDept">
    	    <id column="eid" property="id"/>
    	    <result column="last_name" property="lastName"/>
    	    <result column="email" property="email"/>
    	    <result column="gender" property="gender"/>
    	    <association property="dept" javaType="com.atguigu.ssm.beans.Department">
    	        <id column="did" property="id"/>
    	        <result column="dept_name" property="departmentName"/>
    	    </association>
    	</resultMap>
    	
    </mapper>

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?> 
    <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
    
    <configuration>
    
         
          <settings>
             
             <setting name="mapUnderscoreToCamelCase" value="true"/>
             <setting name="jdbcTypeForNull" value="NULL"/>
             
             <setting name="lazyLoadingEnabled" value="true"/>
             
             <setting name="aggressiveLazyLoading" value="false"/>
          </settings>
         
    </configuration>

*  准备测试  
    EmployeeService.java

package com.atguigu.ssm.service;
    
    import java.util.List;
    
    import com.atguigu.ssm.beans.Employee;
    
    public interface EmployeeService { 
        
    	public List<Employee> getAllEmps();
    	
    }

EmployeeServiceImpl.java

package com.atguigu.ssm.service;
    
    import java.util.List;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    import com.atguigu.ssm.beans.Employee;
    import com.atguigu.ssm.mapper.EmployeeMapper;
    
    @Service
    public class EmployeeServiceImpl implements EmployeeService{ 
    	
    	@Autowired
    	private EmployeeMapper employeeMapper;
    
    	public List<Employee> getAllEmps() { 
    		// TODO Auto-generated method stub
    		return employeeMapper.selectAllEmps();
    	}
    
    }

EmployeeHandler.java

package com.atguigu.ssm.handler;
    
    import java.util.List;
    import java.util.Map;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    
    import com.atguigu.ssm.beans.Employee;
    import com.atguigu.ssm.service.EmployeeService;
    
    @Controller
    public class EmployeeHandler { 
    
    	@Autowired
    	private EmployeeService employeeService;
    	
    	
    	/** * 显示所有的员工信息列表 */
    	@RequestMapping(value="/emps", method=RequestMethod.GET)
    	public String listAllEmps(Map<String, Object> map) { 
    		
    		List<Employee> emps = employeeService.getAllEmps();
    		
    		map.put("emps", emps);
    		
    		return "list";
    		
    	}
    	
    }

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
        <a href="emps">List All Emps</a>
    </body>
    </html>

list.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>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
         <h1 align="center">员工信息列表</h1>
         <table border="1px" align="center" width="70%">
             <tr>
                 <th>ID</th>
                 <th>LastName</th>
                 <th>Email</th>
                 <th>Gender</th>
                 <th>DeptName</th>
                 <th>Operation</th>
             </tr>
             
             <c:forEach items="${emps }" var="emp">
                 <tr align="center">
                    <td>${emp.id }</td>
                    <td>${emp.lastName }</td>
                    <td>${emp.email }</td>
                    <td>${emp.gender==0?'女':'男' }</td>
                    <td>${emp.dept.departmentName}</td>
                    <td>
                       <a href="#">DELETE</a>
                         
                       <a href="#">UPDATE</a>
                    </td>
                 </tr>
             </c:forEach>
         </table>
         
         <h2 align="center"><a href="#">Add New Emp</a></h2>
         
    </body>
    </html>

*  测试结果  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjM0ODQ2_size_16_color_FFFFFF_t_70 3]

[Day43_SSM]: https://blog.csdn.net/qq_40634846/article/details/104291744
[Link 1]: https://me.csdn.net/download/qq_40634846
[2020021313073443.PNG]: https://img-blog.csdnimg.cn/2020021313073443.PNG
[20200213130740490.PNG]: https://img-blog.csdnimg.cn/20200213130740490.PNG
[20200213131828701.PNG]: https://img-blog.csdnimg.cn/20200213131828701.PNG
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjM0ODQ2_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200213131836160.PNG?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjM0ODQ2,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjM0ODQ2_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200213130938392.PNG?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjM0ODQ2,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjM0ODQ2_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20200213131027736.PNG?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjM0ODQ2,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjM0ODQ2_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20200213131729216.PNG?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwNjM0ODQ2,size_16,color_FFFFFF,t_70