Spring是一个开放源代码的设计层面框架，他解决的是业务逻辑层和其他各层的松耦合问题，因此它将面向接口的编程思想贯穿整个系统应用。Spring是于2003 年兴起的一个轻量级的Java 开发框架，由Rod Johnson创建。简单来说，Spring是一个分层的JavaSE/EEfull-stack(一站式) 轻量级开源框架。
本篇还是以示例的形式介绍一下spring是如何整合mybatis。
1.使用maven构建web项目
pom.xml文件配置
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-study-02</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>mybatis-study-02</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<spring4.version>4.2.4.RELEASE</spring4.version>
</properties>
<dependencies>
<!-- junit测试包 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<!-- mybatis核心包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.1</version>
</dependency>
<!-- mybatis整合Ehcache适配器 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-ehcache</artifactId>
<version>1.0.0</version>
</dependency>
<!-- mybatis整合spring适配器 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.0</version>
</dependency>
<!-- 配置ehcache-->
<dependency>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache-core</artifactId>
<version>2.6.10</version>
</dependency>
<!-- 配置spring，使用IOC容器和TX，这些包足够，需要使用其他功能可自行添加，也可将springframework的所有包都添加进去 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>4.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.2.4.RELEASE</version>
<!--spring-core包依赖commons-logging，本次引用了log4j作为日志实现，所以这里让spring-core依赖于log4j，而不是commons-logging包。至于为什么依赖，这个是spring官网说的，不要纠结这个问题-->
<exclusions>
<exclusion>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>4.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.2.4.RELEASE</version>
</dependency>
<!-- 配置springmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.2.4.RELEASE</version>
</dependency>
<!-- 配置log4j -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.12</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.6</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
<!-- mysql连接驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.35</version>
</dependency>
<!-- 配置数据源 -->
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.1</version>
</dependency>
<!-- servlet -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- <dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>3.2.5</version>
</dependency> -->
<!-- 工具包 -->
<!-- <dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.1</version>
</dependency> -->
</dependencies>
</project>
2.mybatis主配置文件
mybatis-config.xml
使用了spring之后，mybatis主配置文件配置较少了。具体存放位置看上图的整个工程架构。
<?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>
<!--
<properties resource="db.properties"></properties>
-->
<settings>
<setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>
<!--
<mappers>
<mapper resource="mapper/system/sysusermapper.xml"/>
</mappers>
-->
</configuration>
3.mybatis映射配置文件
按照业务区分开。具体存放位置看上图的整个工程架构。
这里只展示一个文件的简单配置：
<?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="org.mybatis.dao.SysuserMapper">
<!-- 查询方法1，传递一个参数 -->
<select id="getEmployeeById" resultType="org.mybatis.bean.Employee">
select * from mybatis_employee where id ={id}
</select>
<!-- 查询方法2，传递多个参数
多个参数会被封装成一个map
key:param1,param2...paramn或者参数的索引
value:传入的参数值
{}就是从map中获取指定key的值
-->
<!-- <select id="getEmployeeByIdAndLastName" resultType="org.mybatis.crud.Employee">
select * from mybatis_employee where id ={0} and last_name ={1}
</select> -->
<!--
查询方法2，传递多个参数使用@Param(参数名)
多个参数会被封装成一个map
key:@Param指定的值
value:为传递的参数
-->
<select id="getEmployeeByIdAndLastName" resultType="org.mybatis.bean.Employee">
select * from mybatis_employee where id ={id} and last_name ={lastName}
</select>
<select id="getEmployeeByEmployeeField" resultType="org.mybatis.bean.Employee">
select * from mybatis_employee where id ={id} and last_name ={lastName}
</select>
<select id="getEmployeeByMap" resultType="org.mybatis.bean.Employee">
select * from mybatis_employee where id ={id} and last_name ={lastName}
</select>
<!-- 插入方法mysql -->
<insert id="addEmployee" parameterType="org.mybatis.bean.Employee" useGeneratedKeys="true" keyProperty="id">
insert into mybatis_employee
(last_name,email,gender)
values
(#{lastName},#{email},#{gender});
</insert>
<!-- 插入方法oracle -->
<insert id="addEmployeeo">
<!--
keyProperty=id需要赋值主键的属性，一般都是id
order=before表示在插入之前执行该查询
resultType=Integer表示返回值为integer类型
-->
<selectKey keyProperty="id" order="BEFORE" resultType="Integer">
select employees_seq from dual;
</selectKey>
insert into mybatis_employee
(id,last_name,email,gender)
values
(#{id},#{lastName},#{email},#{gender});
</insert>
<!-- 更新方法 -->
<update id="updateEmployee">
update mybatis_employee
set
last_name ={lastName},
email ={email},
gender ={gender}
where
id ={id}
</update>
<!-- 删除方法 -->
<delete id="deleteEmployee">
delete from mybatis_employee where id ={id}
</delete>
</mapper>
4.spring配置文件
applicationContext.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: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-4.2.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd">
<!-- spring管理所有的业务组件，需要跟springmvc区分 -->
<context:component-scan base-package="org.mybatis">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!-- spring管理数据源，AOP，事务 -->
<!-- 引入数据库外部配置文件 -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- spring配置数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="jdbcUrl" value="${mysql.url}"></property>
<property name="driverClass" value="${mysql.driver}"></property>
<property name="user" value="${mysql.username}"></property>
<property name="password" value="${mysql.password}"></property>
</bean>
<!-- spring配置事务管理器 -->
<bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 配置基于注解的声明式事务 -->
<tx:annotation-driven transaction-manager="dataSourceTransactionManager"/>
<!--
spring整合mybatis
1.spring管理所有组件，mapper实现类
@Autowired自动注入mapper
2.spring管理事务
org.mybatis.spring.SqlSessionFactoryBean实现了spring的FactoryBean接口
-->
<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<!-- 指定全局配置文件的位置 -->
<property name="configLocation" value="classpath:mybatis-config.xml"></property>
<!-- 指定mapper文件的位置 -->
<property name="mapperLocations" value="classpath:mapper/*/*.xml"></property>
</bean>
<!-- 扫描所有的mapper接口的实现，自动注入 -->
<mybatis-spring:scan base-package="org.mybatis.dao"/>
<!-- <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="org.mybatis.dao"></property>
</bean> -->
</beans>
5.spring-mvc配置文件
spring-mvc.xml
视图解析器没什么好解释的，按照固定格式配置就行了。
包扫描，因为spring-mvc只负责v层的页面控制，所以只扫描所有的controller就足够了。
<?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-4.2.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd">
<!-- springmvc控制所有的页面跳转，不牵涉业务逻辑 -->
<!-- 只扫描控制器 -->
<context:component-scan base-package="org.mybatis.controller" use-default-filters="false">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!-- 配置视图解析器 -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<mvc:annotation-driven></mvc:annotation-driven>
<mvc:default-servlet-handler/>
</beans>
6.配置web.xml
引入spring和spring-mvc的配置文件，编码过滤
<?xml version="1.1" encoding="UTF-8"?>
<web-app version="3.0"
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_3_0.xsd">
<display-name>Archetype Created Web Application</display-name>
<!-- spring监听配置 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- springmvc Servlet -->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<!--
实际上也可以不通过contextConfigLocation来配置springmvc的配置文件，可以使用默认的配置文件
默认的配置文件为：/WEB-INF/<servlet-name>-servlet.xml
-->
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<filter>
<filter-name>encodingFilter</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>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
7.创建页面
这里使用欢迎页index.jsp，跳转页面WEB-INF/pages/loginsuccess.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>主页</title>
</head>
<body>
<h1>Index Page</h1>
<!-- 测试 -->
<a href="sysuser/login">welcome</a>
<br><br>
</body>
</html>
<%@ 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>login</title>
</head>
<body>
login success
</body>
</html>
8.创建controller层
package org.mybatis.controller;
import org.mybatis.service.SysuserService;
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;
@Controller
@RequestMapping("/sysuser")
public class SysUserController {
@Autowired
private SysuserService sysuserService;
@RequestMapping(value="/login",method=RequestMethod.GET)
private String sysuserlogin(){
Integer userId = 2;
String loginStatus = sysuserService.login(userId);
System.out.println(loginStatus);
return "loginsuccess";
}
}
9.创建service层
package org.mybatis.service;
public interface SysuserService {
public String login(Integer userId);
}
package org.mybatis.service;
import org.mybatis.bean.Employee;
import org.mybatis.dao.SysuserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service("sysuserService")
public class SysuserServiceImpl implements SysuserService{
@Autowired
private SysuserMapper sysuserMapper;
public String login(Integer userId) {
Employee emp = sysuserMapper.getEmployeeById(userId);
System.out.println(emp);
return "loginsuccess";
}
}
10.创建mapper接口
package org.mybatis.dao;
import java.util.Map;
import org.apache.ibatis.annotations.Param;
import org.mybatis.bean.Employee;
import org.springframework.stereotype.Repository;
@Repository("sysuserMapper")
public interface SysuserMapper {
public Employee getEmployeeById(int id);
}
11.测试
跳转结果
打印结果
DEBUG - DispatcherServlet with name ‘springmvc’ processing GET request for [/mybatis-study-02/sysuser/login]
DEBUG - Looking up handler method for path /sysuser/login
DEBUG - Returning handler method [private java.lang.String org.mybatis.controller.SysUserController.sysuserlogin()]
DEBUG - Returning cached instance of singleton bean ‘sysUserController’
DEBUG - Last-Modified value for [/mybatis-study-02/sysuser/login] is: -1
DEBUG - Creating a new SqlSession
DEBUG - SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@6edbe1dd] was not registered for synchronization because synchronization is not active
DEBUG - Fetching JDBC Connection from DataSource
DEBUG - trace com.mchange.v2.resourcepool.BasicResourcePool@74e22cc5 [managed: 3, unused: 2, excluded: 0] (e.g. com.mchange.v2.c3p0.impl.NewPooledConnection@7f446405)
DEBUG - JDBC Connection [com.mchange.v2.c3p0.impl.NewProxyConnection@66803b47] will not be managed by Spring
DEBUG - ooo Using Connection [com.mchange.v2.c3p0.impl.NewProxyConnection@66803b47]
DEBUG - ==> Preparing: select * from mybatis_employee where id = ?
DEBUG - ==> Parameters: 2(Integer)
DEBUG - Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@6edbe1dd]
DEBUG - Returning JDBC Connection to DataSource
DEBUG - trace com.mchange.v2.resourcepool.BasicResourcePool@74e22cc5 [managed: 3, unused: 2, excluded: 0] (e.g. com.mchange.v2.c3p0.impl.NewPooledConnection@7f446405)
Employee [id=2, lastName=lisi, email=tang_greatman@qq.com, gender=1]
loginsuccess
DEBUG - Invoking afterPropertiesSet() on bean with name ‘loginsuccess’
DEBUG - Rendering view [org.springframework.web.servlet.view.JstlView: name ‘loginsuccess’; URL [/WEB-INF/pages/loginsuccess.jsp]] in DispatcherServlet with name ‘springmvc’
DEBUG - Forwarding to resource [/WEB-INF/pages/loginsuccess.jsp] in InternalResourceView ‘loginsuccess’
DEBUG - Successfully completed request
DEBUG - Returning cached instance of singleton bean ‘sqlSessionFactoryBean’
本文是在前面系列文章的基础之上实现的，如果对mybatis的一些基本使用不会的，建议先参考前面的mybatis详解-(1)到mybatis详解-(22)系列文章。实现都是手把手搭建和测试的。
到此mybatis的使用就介绍完了。
后续还会写一些什么内容呢？敬请期待….