如何实现Mybatis、Spring、SpringMVC框架的SSM整合？
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本文共计2987个文字，预计阅读时间需要12分钟。
SSM整合Maven依赖配置示例：xml junit junit 4.13 test org.springframework spring-core
SSM整合 Maven依赖包 <!-- 测试工具-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
<scope>test</scope>
</dependency>
<!-- Spring重要核心-->
<!-- mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.3.16</version>
</dependency>
<!-- SpringAOP织入-->
<!-- mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.4</version>
</dependency>
<!-- spring中的Mybatis-->
<!-- mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.6</version>
</dependency>
<!-- mysql驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.21</version>
</dependency>
<!-- spring的jdbc(使用连接池技术可不用)-->
<!-- mvnrepository.com/artifact/org.springframework/spring-jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.3.16</version>
</dependency>
<!-- 数据库连接池 -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
<!-- Mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.7</version>
</dependency>
<!--Servlet - JSP -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
Maven资源过滤文件
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>
pojo实体类
实体类User
package com.pojo;
public class User {
private int id;
private String name;
private String pwd;
public User() {
}
public User(int id, String name, String pwd) {
this.id = id;
this.name = name;
this.pwd = pwd;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", pwd='" + pwd + '\'' +
'}';
}
/* getter 和 setter */
}
dao层
数据库相关配置与Mybatis
数据库配置文件
database.properties
# 注意! 使用了 c3p0 数据库链接池的属性要设置为 jdbc.属性名,不加会报错!
jdbc.driver = com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?useSSL=true&serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=123456
mybati核心配置
mybatis-config.xml , 也可以进行mybatis其他的设置,如起别名等
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<mappers>
<!-- 将包内的映射器接口实现全部注册为映射器,注意配置文件要与接口同名同包 -->
<package name="com.dao"/>
</mappers>
</configuration>
Spring中dao层配置文件
spring-dao.xml
<beans xmlns="www.springframework.org/schema/beans"
xmlns:xsi="www.w3.org/2001/XMLSchema-instance"
xmlns:context="www.springframework.org/schema/context"
xsi:schemaLocation="www.springframework.org/schema/beans
www.springframework.org/schema/beans/spring-beans.xsd
www.springframework.org/schema/context
www.springframework.org/schema/context/spring-context.xsd">
<!-- 配置整合mybatis -->
<!-- 关联数据库配置文件 -->
<context:property-placeholder location="classpath:database.properties"/>
<!-- 2.设置mybatis数据源 -->
<!--数据库连接池
dbcp 半自动化操作 不能自动连接
c3p0 自动化操作（自动的加载配置文件 并且设置到对象里面） -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!-- 配置连接池属性 -->
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<!-- c3p0连接池的私有属性-->
<!-- <property name="maxPoolSize" value="30"/>-->
<!-- <property name="minPoolSize" value="10"/>-->
<!-- 关闭连接后不自动commit-->
<!-- <property name="autoCommitOnClose" value="false"/>-->
<!-- 获取连接超时时间-->
<!-- <property name="checkoutTimeout" value="10000"/>-->
<!-- 当获取连接失败重试次数-->
<!-- <property name="acquireRetryAttempts" value="2"/>-->
</bean>
<!-- 3.配置SqlSessionFactory对象 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 注入数据库连接池 -->
<property name="dataSource" ref="dataSource"/>
<!-- 关联MyBaties核心配置文件 -->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<!-- 4.配置扫描Dao接口包，动态实现Dao接口注入到spring容器中 -->
<!--解释 ：www.cnblogs.com/jpfss/p/7799806.html
Mybatis在与Spring集成的时候可以配置MapperFactoryBean来生成Mapper接口的代理.
MapperFactoryBean 创建的代理类实现了 UserMapper 接口,并且注入到应用程序中。 因为代理创建在运行时环境中(Runtime,译者注) ,那么指定的映射器必须是一个接口,而 不是一个具体的实现类。
没有必要在Spring的XML配置文件中注册所有的映射器。相反,你可以使用一个MapperScannerConfigurer, 它将会查找类路 径 下 的 映射器并自动将它们创建成MapperFactoryBean。
<注意!!!>, 没有必要去指定SqlSessionFactory 或 SqlSessionTemplate , 因为MapperScannerConfigurer 将会创建 MapperFactoryBean,之后自动装配。但是,如果你使 用了一个以上的 DataSource ,那么自动装配可能会失效 。这种 情况下,你可以使用 sqlSessionFactoryBeanName 或 sqlSessionTemplateBeanName 属性来设置正确的 bean 名 称来使用。这就是它如何来配置的,<注意!!!>bean的名称是必须的,而不是 bean 的引用,因 此,value 属性在这里替代通常的 ref:
即: 这个扫描类帮我们做了这些事: 扫描指定包下的接口,获得Mapper对象,随后业务层将会用到此Mapper来进行操作
ApplicationContext context = new ClassPathXmlApplicationContext("appconfig.xml");
UserDao userDaoMapper = context.getBean("daoMapper", DaoMapper.class).getMapper(UserDao.class);
-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 注入sqlSessionFactory -->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<!-- 给出需要扫描Dao接口包 -->
<property name="basePackage" value="com.dao"/>
</bean>
</beans>
dao接口 UserMapper
package com.dao;
import com.pojo.User;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface UserMapper {
List getAllUser();
int addUser(User user);
int deleteUser(@Param("id") int id);
int updateUser(User user);
User getUser(@Param("id") int id);
}
接口映射器(sql配置)
如果是配置文件,最好和接口同包同名 , 也可以在接口上使用注解
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.dao.UserMapper">
<insert id="addUser" parameterType="com.pojo.User">
insert into `user`
values (#{id}, #{name}, #{pwd});
</insert>
<delete id="deleteUser" parameterType="int">
delete from `user` where id=#{id}
</delete>
<update id="updateUser" parameterType="com.pojo.User">
update `user`
set id = #{id},name = #{name},pwd = #{pwd}
where id = #{id}
</update>
<select id="getUser" resultType="int">
select * from `user`
where id = #{id};
</select>
<select id="getAllUser" resultType="com.pojo.User">
SELECT * from `user`
</select>
</mapper>
service层(业务层)
Service接口 ,非必需,根据项目情况而定
package com.service;
import com.pojo.User;
import org.apache.ibatis.annotations.Param;
import java.util.List;
interface UserService {
List getAllUser();
int addUser(User user);
int deleteUser(@Param("id") int id);
int updateUser(User user);
User getUser(@Param("id") int id);
}
Service实现类
ServiceImp
package com.service;
import com.dao.UserMapper;
import com.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserServiceImp implements UserService {
/*
业务层调用dao层(Mapper对象)来执行对应的数据库操作; 对应接口的MapperBean由Spring的MapperScannerConfigurer生成
由于UserMapper的映射器对象已经在spring-dao.xml配置中用扫描器注册了,所以可以使用自动装配
此外: // 官方不建议字段自动装配,而是推荐setter注入更灵活
*/
@Autowired
@Qualifier("userMapper")
private UserMapper userMapper;
@Override
public List getAllUser() {
return userMapper.getAllUser();
}
@Override
public int addUser(User user) {
return userMapper.addUser(user);
}
@Override
public int deleteUser(int id) {
return userMapper.deleteUser(id);
}
@Override
public int updateUser(User user) {
return userMapper.updateUser(user);
}
@Override
public User getUser(int id) {
return userMapper.getUser(id);
}
}
Spring中Service层配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="www.springframework.org/schema/beans"
xmlns:xsi="www.w3.org/2001/XMLSchema-instance"
xmlns:context="www.springframework.org/schema/context"
xsi:schemaLocation="www.springframework.org/schema/beans
www.springframework.org/schema/beans/spring-beans.xsd
www.springframework.org/schema/context
www.springframework.org/schema/context/spring-context.xsd">
<!-- 扫描service相关的bean -->
<context:component-scan base-package="com.service" />
<!--
UserServiceImpl注入到IOC容器中,用 注解@Service来注册bean了就不在需要
<bean id="UserServiceImpl" class="com.service.UserServiceImp">
这里引用的userMapper,在spring-dao.xml中注入了,使用到了Spring自带的扫描器 MapperScannerConfigurer
<property name="userMapper" ref="userMapper"/>
</bean>
-->
<!-- 配置事务管理器,为啥要在这里配置事务管理呢,因为业务层嘛,可能会有一些会回滚的操作,所以业务层才需要事务管理 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- 注入数据库连接池,在spring-dao.xml里配置啦 -->
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
controller层
控制器
UserController.java
package com.controller;
import com.pojo.User;
import com.service.UserServiceImp;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.List;
@Controller
@RequestMapping("/user")
public class UserController {
/* controller层调用业务层,
业务层通过 @Service 注解在Spring中注入了
这里自动装配 业务层实现类(bean对象)
控制层通过调用业务层实现类来进行对应的业务操作
*/
@Autowired // 官方不建议字段注入 自动装配,而是推荐setter注入更灵活更安全
@Qualifier("userServiceImp")
private UserServiceImp mapperImp;
//由于类也有url,所以请求的url为:user/getAllUser
@RequestMapping(value = "/getAllUser",produces = "text/html;charset=utf-8")
@ResponseBody
public String getAllUser(){
String date ="";
List<User> users = mapperImp.getAllUser();
for (User user:users){
date+=user+"<br>" ;
System.out.println(user);
}
//返回数据
return date;
}
}
Spring中的控制层配置文件
spring-controller.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="www.springframework.org/schema/beans"
xmlns:xsi="www.w3.org/2001/XMLSchema-instance"
xmlns:context="www.springframework.org/schema/context"
xmlns:mvc="www.springframework.org/schema/mvc"
xsi:schemaLocation="www.springframework.org/schema/beans
www.springframework.org/schema/beans/spring-beans.xsd
www.springframework.org/schema/context
www.springframework.org/schema/context/spring-context.xsd
www.springframework.org/schema/mvc
www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 4.扫描web相关的bean -->
<context:component-scan base-package="com.controller" />
<!-- 配置SpringMVC -->
<!-- 1.开启SpringMVC注解驱动 -->
<mvc:annotation-driven />
<!-- 2.静态资源默认servlet配置-->
<mvc:default-servlet-handler/>
<!-- 3.配置jsp 设置ViewResolver视图解析器相关属性 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
Spring整合所有应用上下文配置
applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="www.springframework.org/schema/beans"
xmlns:xsi="www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="www.springframework.org/schema/beans www.springframework.org/schema/beans/spring-beans.xsd">
<import resource="spring-dao.xml"/> <!--引入dao层配置-->
<import resource="spring-service.xml"/> <!--引入业务层配置-->
<import resource="spring-controller.xml"/> <!--引入控制层层配置-->
</beans>
web配置
配置整个web应用程序的配置文件``web.xml`
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="xmlns.jcp.org/xml/ns/javaee xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!--DispatcherServlet-->
<servlet>
<servlet-name>DispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<!--一定要注意:我们这里加载的是总的配置文件，之前被这里坑了
tomcat是根据总配置文件来启动的-->
<param-value>classpath:applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>DispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!--encodingFilter-->
<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>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--Session过期时间(根据需要设置)-->
<session-config>
<session-timeout>15</session-timeout>
</session-config>
</web-app>
至此,所有的配置都做完了,完结撒花
本文共计2987个文字，预计阅读时间需要12分钟。
SSM整合Maven依赖配置示例：xml junit junit 4.13 test org.springframework spring-core
SSM整合 Maven依赖包 <!-- 测试工具-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
<scope>test</scope>
</dependency>
<!-- Spring重要核心-->
<!-- mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.3.16</version>
</dependency>
<!-- SpringAOP织入-->
<!-- mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.4</version>
</dependency>
<!-- spring中的Mybatis-->
<!-- mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.6</version>
</dependency>
<!-- mysql驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.21</version>
</dependency>
<!-- spring的jdbc(使用连接池技术可不用)-->
<!-- mvnrepository.com/artifact/org.springframework/spring-jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.3.16</version>
</dependency>
<!-- 数据库连接池 -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
<!-- Mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.7</version>
</dependency>
<!--Servlet - JSP -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
Maven资源过滤文件
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>
pojo实体类
实体类User
package com.pojo;
public class User {
private int id;
private String name;
private String pwd;
public User() {
}
public User(int id, String name, String pwd) {
this.id = id;
this.name = name;
this.pwd = pwd;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", pwd='" + pwd + '\'' +
'}';
}
/* getter 和 setter */
}
dao层
数据库相关配置与Mybatis
数据库配置文件
database.properties
# 注意! 使用了 c3p0 数据库链接池的属性要设置为 jdbc.属性名,不加会报错!
jdbc.driver = com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?useSSL=true&serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=123456
mybati核心配置
mybatis-config.xml , 也可以进行mybatis其他的设置,如起别名等
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<mappers>
<!-- 将包内的映射器接口实现全部注册为映射器,注意配置文件要与接口同名同包 -->
<package name="com.dao"/>
</mappers>
</configuration>
Spring中dao层配置文件
spring-dao.xml
<beans xmlns="www.springframework.org/schema/beans"
xmlns:xsi="www.w3.org/2001/XMLSchema-instance"
xmlns:context="www.springframework.org/schema/context"
xsi:schemaLocation="www.springframework.org/schema/beans
www.springframework.org/schema/beans/spring-beans.xsd
www.springframework.org/schema/context
www.springframework.org/schema/context/spring-context.xsd">
<!-- 配置整合mybatis -->
<!-- 关联数据库配置文件 -->
<context:property-placeholder location="classpath:database.properties"/>
<!-- 2.设置mybatis数据源 -->
<!--数据库连接池
dbcp 半自动化操作 不能自动连接
c3p0 自动化操作（自动的加载配置文件 并且设置到对象里面） -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!-- 配置连接池属性 -->
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<!-- c3p0连接池的私有属性-->
<!-- <property name="maxPoolSize" value="30"/>-->
<!-- <property name="minPoolSize" value="10"/>-->
<!-- 关闭连接后不自动commit-->
<!-- <property name="autoCommitOnClose" value="false"/>-->
<!-- 获取连接超时时间-->
<!-- <property name="checkoutTimeout" value="10000"/>-->
<!-- 当获取连接失败重试次数-->
<!-- <property name="acquireRetryAttempts" value="2"/>-->
</bean>
<!-- 3.配置SqlSessionFactory对象 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 注入数据库连接池 -->
<property name="dataSource" ref="dataSource"/>
<!-- 关联MyBaties核心配置文件 -->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<!-- 4.配置扫描Dao接口包，动态实现Dao接口注入到spring容器中 -->
<!--解释 ：www.cnblogs.com/jpfss/p/7799806.html
Mybatis在与Spring集成的时候可以配置MapperFactoryBean来生成Mapper接口的代理.
MapperFactoryBean 创建的代理类实现了 UserMapper 接口,并且注入到应用程序中。 因为代理创建在运行时环境中(Runtime,译者注) ,那么指定的映射器必须是一个接口,而 不是一个具体的实现类。
没有必要在Spring的XML配置文件中注册所有的映射器。相反,你可以使用一个MapperScannerConfigurer, 它将会查找类路 径 下 的 映射器并自动将它们创建成MapperFactoryBean。
<注意!!!>, 没有必要去指定SqlSessionFactory 或 SqlSessionTemplate , 因为MapperScannerConfigurer 将会创建 MapperFactoryBean,之后自动装配。但是,如果你使 用了一个以上的 DataSource ,那么自动装配可能会失效 。这种 情况下,你可以使用 sqlSessionFactoryBeanName 或 sqlSessionTemplateBeanName 属性来设置正确的 bean 名 称来使用。这就是它如何来配置的,<注意!!!>bean的名称是必须的,而不是 bean 的引用,因 此,value 属性在这里替代通常的 ref:
即: 这个扫描类帮我们做了这些事: 扫描指定包下的接口,获得Mapper对象,随后业务层将会用到此Mapper来进行操作
ApplicationContext context = new ClassPathXmlApplicationContext("appconfig.xml");
UserDao userDaoMapper = context.getBean("daoMapper", DaoMapper.class).getMapper(UserDao.class);
-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 注入sqlSessionFactory -->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<!-- 给出需要扫描Dao接口包 -->
<property name="basePackage" value="com.dao"/>
</bean>
</beans>
dao接口 UserMapper
package com.dao;
import com.pojo.User;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface UserMapper {
List getAllUser();
int addUser(User user);
int deleteUser(@Param("id") int id);
int updateUser(User user);
User getUser(@Param("id") int id);
}
接口映射器(sql配置)
如果是配置文件,最好和接口同包同名 , 也可以在接口上使用注解
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.dao.UserMapper">
<insert id="addUser" parameterType="com.pojo.User">
insert into `user`
values (#{id}, #{name}, #{pwd});
</insert>
<delete id="deleteUser" parameterType="int">
delete from `user` where id=#{id}
</delete>
<update id="updateUser" parameterType="com.pojo.User">
update `user`
set id = #{id},name = #{name},pwd = #{pwd}
where id = #{id}
</update>
<select id="getUser" resultType="int">
select * from `user`
where id = #{id};
</select>
<select id="getAllUser" resultType="com.pojo.User">
SELECT * from `user`
</select>
</mapper>
service层(业务层)
Service接口 ,非必需,根据项目情况而定
package com.service;
import com.pojo.User;
import org.apache.ibatis.annotations.Param;
import java.util.List;
interface UserService {
List getAllUser();
int addUser(User user);
int deleteUser(@Param("id") int id);
int updateUser(User user);
User getUser(@Param("id") int id);
}
Service实现类
ServiceImp
package com.service;
import com.dao.UserMapper;
import com.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserServiceImp implements UserService {
/*
业务层调用dao层(Mapper对象)来执行对应的数据库操作; 对应接口的MapperBean由Spring的MapperScannerConfigurer生成
由于UserMapper的映射器对象已经在spring-dao.xml配置中用扫描器注册了,所以可以使用自动装配
此外: // 官方不建议字段自动装配,而是推荐setter注入更灵活
*/
@Autowired
@Qualifier("userMapper")
private UserMapper userMapper;
@Override
public List getAllUser() {
return userMapper.getAllUser();
}
@Override
public int addUser(User user) {
return userMapper.addUser(user);
}
@Override
public int deleteUser(int id) {
return userMapper.deleteUser(id);
}
@Override
public int updateUser(User user) {
return userMapper.updateUser(user);
}
@Override
public User getUser(int id) {
return userMapper.getUser(id);
}
}
Spring中Service层配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="www.springframework.org/schema/beans"
xmlns:xsi="www.w3.org/2001/XMLSchema-instance"
xmlns:context="www.springframework.org/schema/context"
xsi:schemaLocation="www.springframework.org/schema/beans
www.springframework.org/schema/beans/spring-beans.xsd
www.springframework.org/schema/context
www.springframework.org/schema/context/spring-context.xsd">
<!-- 扫描service相关的bean -->
<context:component-scan base-package="com.service" />
<!--
UserServiceImpl注入到IOC容器中,用 注解@Service来注册bean了就不在需要
<bean id="UserServiceImpl" class="com.service.UserServiceImp">
这里引用的userMapper,在spring-dao.xml中注入了,使用到了Spring自带的扫描器 MapperScannerConfigurer
<property name="userMapper" ref="userMapper"/>
</bean>
-->
<!-- 配置事务管理器,为啥要在这里配置事务管理呢,因为业务层嘛,可能会有一些会回滚的操作,所以业务层才需要事务管理 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- 注入数据库连接池,在spring-dao.xml里配置啦 -->
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
controller层
控制器
UserController.java
package com.controller;
import com.pojo.User;
import com.service.UserServiceImp;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.List;
@Controller
@RequestMapping("/user")
public class UserController {
/* controller层调用业务层,
业务层通过 @Service 注解在Spring中注入了
这里自动装配 业务层实现类(bean对象)
控制层通过调用业务层实现类来进行对应的业务操作
*/
@Autowired // 官方不建议字段注入 自动装配,而是推荐setter注入更灵活更安全
@Qualifier("userServiceImp")
private UserServiceImp mapperImp;
//由于类也有url,所以请求的url为:user/getAllUser
@RequestMapping(value = "/getAllUser",produces = "text/html;charset=utf-8")
@ResponseBody
public String getAllUser(){
String date ="";
List<User> users = mapperImp.getAllUser();
for (User user:users){
date+=user+"<br>" ;
System.out.println(user);
}
//返回数据
return date;
}
}
Spring中的控制层配置文件
spring-controller.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="www.springframework.org/schema/beans"
xmlns:xsi="www.w3.org/2001/XMLSchema-instance"
xmlns:context="www.springframework.org/schema/context"
xmlns:mvc="www.springframework.org/schema/mvc"
xsi:schemaLocation="www.springframework.org/schema/beans
www.springframework.org/schema/beans/spring-beans.xsd
www.springframework.org/schema/context
www.springframework.org/schema/context/spring-context.xsd
www.springframework.org/schema/mvc
www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 4.扫描web相关的bean -->
<context:component-scan base-package="com.controller" />
<!-- 配置SpringMVC -->
<!-- 1.开启SpringMVC注解驱动 -->
<mvc:annotation-driven />
<!-- 2.静态资源默认servlet配置-->
<mvc:default-servlet-handler/>
<!-- 3.配置jsp 设置ViewResolver视图解析器相关属性 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
Spring整合所有应用上下文配置
applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="www.springframework.org/schema/beans"
xmlns:xsi="www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="www.springframework.org/schema/beans www.springframework.org/schema/beans/spring-beans.xsd">
<import resource="spring-dao.xml"/> <!--引入dao层配置-->
<import resource="spring-service.xml"/> <!--引入业务层配置-->
<import resource="spring-controller.xml"/> <!--引入控制层层配置-->
</beans>
web配置
配置整个web应用程序的配置文件``web.xml`
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="xmlns.jcp.org/xml/ns/javaee xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!--DispatcherServlet-->
<servlet>
<servlet-name>DispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<!--一定要注意:我们这里加载的是总的配置文件，之前被这里坑了
tomcat是根据总配置文件来启动的-->
<param-value>classpath:applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>DispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!--encodingFilter-->
<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>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--Session过期时间(根据需要设置)-->
<session-config>
<session-timeout>15</session-timeout>
</session-config>
</web-app>
至此,所有的配置都做完了,完结撒花