黑猴子的家：JavaEE 之 SSM 框架整合

作者: 黑猴子的家 | 来源:发表于2020-11-20 07:31 被阅读0次

1、整合前需要注意的问题

尖叫提示：框架版本是否兼容
1）查看不同MyBatis版本整合Spring时使用的适配包
http://www.mybatis.org/spring/

2）下载整合适配包
https://github.com/mybatis/spring/releases

3）官方整合示例，jpetstore
https://github.com/mybatis/jpetstore-6

2、SSM整合思想

1）导入整合需要的jar包

（1）Spring的jar包
（2）SpringMVC的jar包
（3）MyBatis的jar包
（4）整合的适配包
（5）数据库驱动包、日志包、连接池等

2）MyBatis环境的搭建

（1）MyBatis的全局配置文件
（2）编写javaBean，Mapper接口，sql映射文件

3）Spring SpringMVC环境的搭建

（1）web.xml中配置SpringIOC容器启动的监听器、SpringMVC的核心控制器、REST过滤器
（2）编写Spring的配置文件: applicationContext.xml
（3）编写SpringMVC的配置文件: springmvc.xml

4）Spring整合MyBatis

（1）配置创建SqlSession对象的SqlSessionFactoryBean
（2）配置扫描所有的Mapper接口，批量生成代理实现类，交给Spring管理的，能够完成自动注入.

5）编码测试

完成员工的增删改查.

3、SSM 框架整合实操

1）创建web 工程

（1） File -> New -> Other

（2）Dynamic Web Project -> Next

（3）Project name -> Finish

2）导入jar包

（1）Spring jar 包

com.springsource.net.sf.cglib-2.2.0.jar
com.springsource.org.aopalliance-1.0.0.jar
com.springsource.org.aspectj.weaver-1.6.8.RELEASE.jar
spring-aop-4.0.0.RELEASE.jar
spring-aspects-4.0.0.RELEASE.jar
spring-beans-4.0.0.RELEASE.jar
spring-context-4.0.0.RELEASE.jar
spring-core-4.0.0.RELEASE.jar
spring-expression-4.0.0.RELEASE.jar
spring-jdbc-4.0.0.RELEASE.jar
spring-orm-4.0.0.RELEASE.jar
spring-tx-4.0.0.RELEASE.jar
commons-logging-1.1.3.jar

（2）Spring MVC jar 包

spring-web-4.0.0.RELEASE.jar
spring-webmvc-4.0.0.RELEASE.jar

（3）MyBatis jar包

mybatis-3.4.1.jar

（4）JSTL jar 包

taglibs-standard-impl-1.2.1.jar
taglibs-standard-spec-1.2.1.jar

（5）整合的适配包

mybatis-spring-1.3.0.jar

（6）驱动、日志、连接池包

c3p0-0.9.1.2.jar
log4j.jar
mysql-connector-java-5.1.37-bin.jar

（7）反向工程jar包

mybatis-generator-core-1.3.2.jar

（8）log4j.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
 <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
   <param name="Encoding" value="UTF-8" />
   <layout class="org.apache.log4j.PatternLayout">
    <param name="ConversionPattern" value="%-5p %d{MM-dd HH:mm:ss,SSS} %m  (%F:%L) \n" />
   </layout>
 </appender>
 <logger name="java.sql">
   <level value="debug" />
 </logger>
 <logger name="org.apache.ibatis">
   <level value="info" />
 </logger>
 <root>
   <level value="debug" />
   <appender-ref ref="STDOUT" />
 </root>
</log4j:configuration>

（9）分页jar包

pagehelper-5.0.0-rc.jar
jsqlparser-0.9.5.jar

3）MyBatis 环境搭建

思想
MyBatis的全局配置文件
编写javaBean，Mapper接口，sql映射文件

方式
使用逆向工程方式实现

（1）添加逆向工程jar包

mybatis-generator-core-1.3.2.jar

（2）添加mbg.xml 配置文件
mbg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
  PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
  "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>

  <!-- targetRuntime: 指定生成的逆向工程的版本
            MyBatis3:  生成带条件的增删改查.
            MyBatis3Simple:  生成基本的增删改查.
   -->
  <context id="DB2Tables" targetRuntime="MyBatis3">
  
    <!-- 数据库的连接 -->
    <jdbcConnection driverClass="com.mysql.jdbc.Driver"
        connectionURL="jdbc:mysql://localhost:3306/mybatis"
        userId="root"
        password="root">
    </jdbcConnection>

    <!-- 指定javabean的生成策略 
        targetPackage: 指定包
        targetProject: 指定工程
    -->
    <javaModelGenerator targetPackage="com.alex.ssm.entity" targetProject=".\src">
      <property name="enableSubPackages" value="true" />
      <property name="trimStrings" value="true" />
    </javaModelGenerator>
    
    <!-- sql映射的生成策略  -->
    <sqlMapGenerator targetPackage="com.alex.ssm.mapper"  targetProject=".\resources">
      <property name="enableSubPackages" value="true" />
    </sqlMapGenerator>
    
    <!-- mapper接口的生成策略 -->
    <javaClientGenerator type="XMLMAPPER" targetPackage="com.alex.ssm.mapper"  targetProject=".\src">
      <property name="enableSubPackages" value="true" />
    </javaClientGenerator>

    <!-- 指定逆向分析的表 -->
    <table tableName="tbl_dept" domainObjectName="Department"></table>
    <table tableName="tbl_employee" domainObjectName="Employee"></table>
    
  </context>
</generatorConfiguration>

（3）创建包文件

com.alex.ssm.entity
com.alex.ssm.mapper
com.alex.ssm.test

（4）创建逆向工程方法
MyBatisTestMBG.java

package com.alex.mybatis.test;

import java.io.File;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.internal.DefaultShellCallback;

public class MyBatisTestMBG {

    @Test
    public void createMBG() throws Exception {
           List<String> warnings = new ArrayList<String>();
           boolean overwrite = true;
           File configFile = new File("mbg.xml");
           ConfigurationParser cp = new ConfigurationParser(warnings);
           Configuration config = cp.parseConfiguration(configFile);
           DefaultShellCallback callback = new DefaultShellCallback(overwrite);
           MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
           myBatisGenerator.generate(null);
    } 
}

（5）创建db.properties文件

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?allowMultiQueries=true
jdbc.username=root
jdbc.password=root

（6）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">
<!-- MyBatis的全局配置文件 -->
<configuration>

    <!-- properties: 
            引入外部化的配置文件
            resource: 加载类路径下的资源文件
            url: 加载网络路径或者是磁盘路径下的资源文件
    -->
    <properties resource="db.properties" ></properties>
    
    <!-- settings:
            包含很多重要的设置项，可以改变MyBatis框架的运行行为
            setting:具体的一个设置项
                name: 设置项的名称
                value:设置项的取值
    -->
    <settings>
        <!-- 映射下划线到驼峰命名    last_name ==> lastName    -->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <!-- 开启延迟加载 -->
        <setting name="lazyLoadingEnabled" value="true"/>
        <!-- 指定加载的属性是按需加载. -->
        <setting name="aggressiveLazyLoading" value="false"/>
        <!-- 二级缓存 -->
        <setting name="cacheEnabled" value="true"/>
    </settings>
    
    <!-- typeAliases
            别名处理，给java类型取别名(简短)
            typeAlias:给单个的java类型取别名
                type:指定java类型(全类名)
               alias:指定别名。默认的别名是类名的首字母小写. 别名不区分大小写.
             package:批量取别名，给指定的包下的所有的类取默认的别名
                name:指定包名
     -->
    <typeAliases>
        <!-- <typeAlias type="com.alex.ssm.entity.Employee" alias="employee"/> -->
        <package name="com.alex.ssm.entity"/>
    </typeAliases>
    
    <!-- environments: 环境们。 支持配置多个环境. 通过default来指定具体使用的环境.
            environment: 具体的一个环境配置，必须包含transactionManager，dataSource。
                id: 当前环境的唯一标识.
                transactionManager: 事务管理器.
                    JDBC: JdbcTransactionFactory
                            将来事务管理会交给Spring的声明式事务.@Trancation
                dataSource:数据源.
                    POOLED: PooledDataSourceFactory
                                将来数据源交给Spring管理,使用c3p0或者dbcp等
    -->
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}" />
                <property name="url" value="${jdbc.url}" />
                <property name="username" value="${jdbc.username}" />
                <property name="password" value="${jdbc.password}" />
            </dataSource>
        </environment>
        
        <environment id="test">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}" />
                <property name="url" value="${jdbc.url}" />
                <property name="username" value="${jdbc.username}" />
                <property name="password" value="${jdbc.password}" />
            </dataSource>
        </environment>
    </environments>
    
    <!-- 
        mappers:引入sql映射文件
            mapper:引入单个的sql映射文件
            package: 批量引入sql映射文件    
            要求: sql映射文件的名字与Mapper接口的名字一致.并且在同一目录下.
    -->
    <mappers>
        <!-- <mapper resource="EmployeeMapper.xml"  /> -->
        <package name="com.alex.ssm.mapper"/>
    </mappers>
    
</configuration>

（7）mybatis.sql

/*
Navicat MySQL Data Transfer

Source Server         : localhost
Source Server Version : 50515
Source Host           : localhost:3306
Source Database       : mybatis

Target Server Type    : MYSQL
Target Server Version : 50515
File Encoding         : 65001

Date: 2019-10-16 14:38:06
*/

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for tbl_dept
-- ----------------------------
DROP TABLE IF EXISTS `tbl_dept`;
CREATE TABLE `tbl_dept` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `department_name` varchar(50) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of tbl_dept
-- ----------------------------
INSERT INTO `tbl_dept` VALUES ('1', '开发部');
INSERT INTO `tbl_dept` VALUES ('2', '测试部');
INSERT INTO `tbl_dept` VALUES ('3', '财务部');
INSERT INTO `tbl_dept` VALUES ('4', '人事部');

-- ----------------------------
-- Table structure for tbl_employee
-- ----------------------------
DROP TABLE IF EXISTS `tbl_employee`;
CREATE TABLE `tbl_employee` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `last_name` varchar(50) DEFAULT NULL,
  `email` varchar(50) DEFAULT NULL,
  `gender` char(1) DEFAULT NULL,
  `d_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `fk_emp_dept` (`d_id`),
  CONSTRAINT `fk_emp_dept` FOREIGN KEY (`d_id`) REFERENCES `tbl_dept` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1006 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of tbl_employee
-- ----------------------------
INSERT INTO `tbl_employee` VALUES ('1001', 'Tom', 'Tom@aliyun.com', '1', '1');
INSERT INTO `tbl_employee` VALUES ('1002', 'Rose', 'rose@aliyun.com', '0', '2');
INSERT INTO `tbl_employee` VALUES ('1003', 'Alex', 'alex@qq.com', '1', '3');
INSERT INTO `tbl_employee` VALUES ('1004', 'Thone', 'Thone@aliyun.com', '0', '4');
INSERT INTO `tbl_employee` VALUES ('1005', 'Jerry', 'jerry@aliyun.com', '1', '2');

（8）创建Mybatis测试方法

package com.alex.mybatis.test;

import java.io.InputStream;
import java.util.List;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import com.alex.ssm.entity.Employee;
import com.alex.ssm.entity.EmployeeExample;
import com.alex.ssm.entity.EmployeeExample.Criteria;
import com.alex.ssm.mapper.EmployeeMapper;

public class MyBatisTestMBG {

    public SqlSessionFactory getSqlSessionFactory() throws Exception {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        System.out.println(sqlSessionFactory);
        return sqlSessionFactory;
    }

    // 根据id查询
    @Test
    public void testMBG01() throws Exception {
        SqlSessionFactory ssf = getSqlSessionFactory();
        SqlSession session = ssf.openSession();
        try {
            EmployeeMapper mapper = session.getMapper(EmployeeMapper.class);
            Employee employee = mapper.selectByPrimaryKey(1001);
            System.out.println(employee);
        } finally {
            session.close();
        }
    }

    // 没有条件的情况，查询全部信息
    @Test
    public void testMBG02() throws Exception {
        SqlSessionFactory ssf = getSqlSessionFactory();
        SqlSession session = ssf.openSession();
        try {
            EmployeeMapper mapper = session.getMapper(EmployeeMapper.class);
            List<Employee> emps = mapper.selectByExample(null);
            for (Employee employee : emps) {
                System.out.println(employee);
            }
        } finally {
            session.close();
        }
    }

    // 按照条件查询
    @Test
    public void testMBG03() throws Exception {
        SqlSessionFactory ssf = getSqlSessionFactory();
        SqlSession session = ssf.openSession();
        try {
            EmployeeMapper mapper = session.getMapper(EmployeeMapper.class);

            // 查询员工名字中带有e字母 和员工性别是2的 或者email中带有y字母的
            EmployeeExample example = new EmployeeExample();

            Criteria criteria = example.createCriteria();
            criteria.andLastNameLike("%e%");
            criteria.andGenderEqualTo("0");

            // or的条件需要重新使用一个Criteria对象
            Criteria criteria2 = example.createCriteria();
            criteria2.andEmailLike("%y%");

            // 对于封装or条件的criteria，需要or到example
            example.or(criteria2);
            List<Employee> emps = mapper.selectByExample(example);
            for (Employee employee : emps) {
                System.out.println(employee);
            }
        } finally {
            session.close();
        }
    }
}

4）Spring SpringMVC 环境的搭建

（1）思想
web.xml中配置
SpringIOC容器启动的监听器
SpringMVC的核心控制器
REST过滤器
UTF-8编码
编写Spring的配置文件: applicationContext.xml
编写SpringMVC的配置文件: springmvc.xml

（2）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">
  <display-name>ssm</display-name>
  
    <!-- 实例化SpringIOC容器的监听器 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring-context.xml</param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
    <!-- 配置utf-8编码 -->
    <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>
    
    <!-- REST 过滤器 -->
    <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>
    
    
    <!-- Springmvc的核心控制器 -->
    <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-context.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>
    
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
</web-app>

（3）spring-context.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:context="http://www.springframework.org/schema/context"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:jdbc="http://www.springframework.org/schema/jdbc"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.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">

    <!-- 开启注解扫描 -->
    <context:component-scan base-package="com.alex.ssm">
        <!-- Springmvc管理的，Spring就不管理 -->
        <context:exclude-filter type="annotation"
            expression="org.springframework.stereotype.Controller" />
    </context:component-scan>

    <!-- 读取外部文件 -->
    <context:property-placeholder location="classpath:/db.properties" />

    <!-- C3P0 数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="user" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
        <property name="jdbcUrl" value="${jdbc.url}" />
        <property name="driverClass" value="${jdbc.driver}" />
        <property name="initialPoolSize" value="${jdbc.initialPoolSize}" />
        <property name="minPoolSize" value="${jdbc.minPoolSize}" />
        <property name="maxPoolSize" value="${jdbc.maxPoolSize}" />
        <property name="acquireIncrement" value="${jdbc.acquireIncrement}" />
        <property name="maxStatements" value="${jdbc.maxStatements}" />
        <property name="maxStatementsPerConnection" value="${jdbc.maxStatementsPerConnection}" />
    </bean>

    <!-- 事务切面 -->
    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 开启基于注解的声明式事务 transaction-manager="transactionManager" 默认值,可以省略. -->
    <tx:annotation-driven transaction-manager="transactionManager" />
</beans>

（4）springmvc-context.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:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:jdbc="http://www.springframework.org/schema/jdbc"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.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
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">
        
    <!-- 注解扫描 -->
    <context:component-scan base-package="com.alex.ssm" use-default-filters="false">
        <!-- 只扫描SpringMVC相关的组件 -->
        <context:include-filter type="annotation" 
                expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    
    <!-- 视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
    
   <mvc:default-servlet-handler/>
   <mvc:annotation-driven/>
    
</beans>

（5）db.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?allowMultiQueries=true
jdbc.username=root
jdbc.password=root
jdbc.initialPoolSize=30
jdbc.minPoolSize=10
jdbc.maxPoolSize=100
jdbc.acquireIncrement=5
jdbc.maxStatements=1000
jdbc.maxStatementsPerConnection=10

5）Spring整合MyBatis

配置创建SqlSession对象的SqlSessionFactoryBean
配置扫描所有的Mapper接口，批量生成代理实现类，交给Spring管理的，能够完成自动注入.

（1）spring-context.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:context="http://www.springframework.org/schema/context"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:jdbc="http://www.springframework.org/schema/jdbc"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring"
    xsi:schemaLocation="http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        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">

    <!-- 开启注解扫描 -->
    <context:component-scan base-package="com.alex.ssm">
        <!-- Springmvc管理的，Spring就不管理 -->
        <context:exclude-filter type="annotation"
            expression="org.springframework.stereotype.Controller" />
    </context:component-scan>

    <!-- 读取外部文件 -->
    <context:property-placeholder location="classpath:/db.properties" />

    <!-- C3P0 数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="user" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
        <property name="jdbcUrl" value="${jdbc.url}" />
        <property name="driverClass" value="${jdbc.driver}" />
        <property name="initialPoolSize" value="${jdbc.initialPoolSize}" />
        <property name="minPoolSize" value="${jdbc.minPoolSize}" />
        <property name="maxPoolSize" value="${jdbc.maxPoolSize}" />
        <property name="acquireIncrement" value="${jdbc.acquireIncrement}" />
        <property name="maxStatements" value="${jdbc.maxStatements}" />
        <property name="maxStatementsPerConnection" value="${jdbc.maxStatementsPerConnection}" />
    </bean>

    <!-- 事务切面 -->
    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 开启基于注解的声明式事务 transaction-manager="transactionManager" 默认值,可以省略. -->
    <tx:annotation-driven transaction-manager="transactionManager" />
    
    <!-- 整合 MyBatis MyBatis的配置都可以在Spring里面配置，但是尽量把MyBatis独有的还是放在MyBatis配置文件里-->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据源 -->
        <property name="dataSource" ref="dataSource" ></property>
        <!-- 指定MyBatis的全局配置文件 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        <!-- 指定sql映射文件 -->
        <property name="mapperLocations" value="classpath:com/alex/ssm/mapper/*.xml"></property>
    </bean>
    
    <!-- 扫描所有mapper接口，批量生成代理实现类，交给Spring容器来管理 -->
    <!-- 这是老版本的配置方式，没办法指定ID,ID默认是类的首字母小写 -->
    <!-- 
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.alex.ssm.mapper"></property>
    </bean>
    -->
    
    <!-- 扫描所有mapper接口，批量生成代理实现类，交给Spring容器来管理 -->
    <!-- 新方式 ， 两种方式，使用哪一种都可以-->
    <mybatis-spring:scan base-package="com.alex.ssm.mapper"/>
</beans>

（2）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">
<!-- MyBatis的全局配置文件 -->
<configuration> 
   
    <settings>
        <!-- 映射下划线到驼峰命名    last_name ==> lastName    -->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <!-- 开启延迟加载 -->
        <setting name="lazyLoadingEnabled" value="true"/>
        <!-- 指定加载的属性是按需加载. -->
        <setting name="aggressiveLazyLoading" value="false"/>
        <!-- 二级缓存 -->
        <setting name="cacheEnabled" value="true"/>
    </settings> 
     
    <typeAliases>
        <package name="com.alex.ssm.entity"/>
    </typeAliases> 
     
    <plugins>
        <plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
    </plugins>
    
</configuration>

尖叫提示：把交给Spring 管理的从MyBatis配置文件中删掉

6）编码测试

完成员工的增删改查.
（1）EmployeeController.java

package com.alex.ssm.controller;

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.alex.ssm.entity.Employee;
import com.alex.ssm.service.EmployeeService;

@Controller
public class EmployeeController {

    @Autowired
    private EmployeeService employeeService ;
    
    @RequestMapping(value="/emps",method=RequestMethod.GET)
    public String listEmps(Map<String,Object> map) {
        List<Employee> emps = employeeService.getAllEmps();
        map.put("emps",emps);
        return "list";
    }
}

（2）EmployeeService.java

package com.alex.ssm.service;

import java.util.List;

import com.alex.ssm.entity.Employee;

public interface EmployeeService {

    public List<Employee> getAllEmps();
}

（3）EmployeeServiceImpl.Java

package com.alex.ssm.serviceimpl;

import java.util.List;

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

import com.alex.ssm.entity.Employee;
import com.alex.ssm.mapper.EmployeeMapper;
import com.alex.ssm.service.EmployeeService;

@Service
public class EmployeeServiceImpl implements EmployeeService{
    
    @Autowired
    private EmployeeMapper employeeMapper ;

    @Override
    public List<Employee> getAllEmps() {
        List<Employee> example = employeeMapper.selectByExample(null);
        return example;
    }
}

（4）index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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>
</head>
<body>
    <a href="${pageContext.request.contextPath}/emps">List ALL Emps</a>
</body>
</html>

（5）list.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!-- 导入JSTL标签库 -->
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!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>
</head>
<body>
    <h1 align="center" >员工信息列表</h1>
    <table border="1px" width="70%" cellspacing="0px" align="center">
        <tr>
            <th>ID</th>
            <th>LastName</th>
            <th>Email</th>
            <th>Gender</th>
            <!-- <th>DeptName</th> -->
            <th>Operation</th>
        </tr>
        <!-- items:指定要迭代的集合   var：代表当前迭代出的对象-->   
        <c:forEach items="${requestScope.emps }" var="emp">
            <tr align="center">
                <td>${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="#">Edit</a>
                    &nbsp;&nbsp;
                    <a href="#">Delete</a>
                </td>
            </tr>
        </c:forEach>
    
    </table>
</body>
</html>