Spring

AOP在Spring中的作用

提供声明式事务：允许用户自定义切面

• 横切关注点：跨越应用程序多个模块的方法或功能。即使与我们业务逻辑无关的，但是我们需要关注的部分，就是横切关注点。如日志，安全，缓存，事务。
• 切面（Aspect）：横切关注点 被模块化的特殊对象。它是一个类。
• 通知（Advice）：切面必须要完成的工作，它是类中的一个方法。
• 目标（Target）：被通知对象
• 代理（Proxy）：向目标对象应用通知之后创建的对象。
• 切入点（PointCut）：切面通知 执行的“地点”的定义。
• 连接点（JointPoint）：与切入点匹配的执行点。

使用Spring实现AOP

方式一：

使用Spring的API接口【主要是SpringAPI接口实现】

AfterLog

public class AfterLog implements AfterReturningAdvice {//returnValue 返回值public void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable {System.out.println("执行了" + method.getName() + "返回结果为：" + returnValue);}
}

Log

//method： 执行的目标对象的方法
//args：参数
//target：目标对象public class Log implements MethodBeforeAdvice {public void before(Method method, Object[] args, Object target) throws Throwable {System.out.println(target.getClass().getName()+"的"+method.getName()+"被执行了");}
}

UserService

public interface UserService {public void add();public void delete();public void update();public void select();}

UserServiceImpl

public class UserServiceImpl implements UserService {public void add() {System.out.println("增加用户");}public void delete() {System.out.println("删除用户");}public void update() {System.out.println("修改用户");}public void select() {System.out.println("查询用户");}
}

applicationContext.xml

    <!--注册bean--><bean id="userService" class="com.kang.service.UserServiceImpl"/><bean id="log" class="com.kang.log.Log"/><bean id="afterLog" class="com.kang.log.AfterLog"/><!--配置AOP--><aop:config><!--切入点 expression表达式: expression(要执行的位置！* * * *)--><aop:pointcut id="pointcut" expression="execution(* com.kang.service.UserServiceImpl.*(..))"></aop:pointcut><!--执行环绕增加！--><aop:advisor advice-ref="log" pointcut-ref="pointcut"/><aop:advisor advice-ref="afterLog" pointcut-ref="pointcut"/></aop:config>

MyTest

    public static void main(String[] args) {ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");//动态代理 代理的是接口UserService userService = context.getBean("userService", UserService.class);userService.add();}
}

方式二：

自定义实现AOP【主要是切面的定义】

DiyPointCut

public class DiyPointCut {public void before() {System.out.println("=====方法执行前=====");}public void after() {System.out.println("=====方法执行后=====");}}

UserService

public interface UserService {public void add();public void delete();public void update();public void select();}

UserServiceImpl

public class UserServiceImpl implements UserService {public void add() {System.out.println("增加用户");}public void delete() {System.out.println("删除用户");}public void update() {System.out.println("修改用户");}public void select() {System.out.println("查询用户");}
}

MyTest

    public static void main(String[] args) {ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");//动态代理 代理的是接口UserService userService = context.getBean("userService", UserService.class);userService.delete();}

方式三：

使用注解实现AOP

AnnotationPointCut

//方式三：使用注解方式实现AOP
@Aspect //标注这个类是一个切面
public class AnnotationPointCut {@Before("execution(* com.kang.service.UserServiceImpl.*(..))")public void before(){System.out.println("===方法执行前===");}@After("execution(* com.kang.service.UserServiceImpl.*(..))")public void after(){System.out.println("===执行方法后===");}//在环绕增强中，我们可以给定一个参数，代表我们要获取处理切入的点@Around("execution(* com.kang.service.UserServiceImpl.*(..))")public void around(ProceedingJoinPoint jp) throws Throwable {System.out.println("环绕前");Signature signature = jp.getSignature();//获得签名System.out.println("signature:"+signature);//执行方法Object proceed = jp.proceed();System.out.println("环绕后");System.out.println(proceed);}
}

UserService
public interface UserService {public void add();public void delete();public void update();public void select();}

UserServiceImpl

public class UserServiceImpl implements UserService {public void add() {System.out.println("增加用户");}public void delete() {System.out.println("删除用户");}public void update() {System.out.println("修改用户");}public void select() {System.out.println("查询用户");}
}

applicationContext.xml

	<!--注册bean--><bean id="userService" class="com.kang.service.UserServiceImpl"/><bean id="log" class="com.kang.log.Log"/><bean id="afterLog" class="com.kang.log.AfterLog"/><!--方式三--><bean id="annotationPointCut" class="com.kang.diy.AnnotationPointCut"/><!--开启注解支持--><aop:aspectj-autoproxy proxy-target-class="false"/>

整合Mybatis

导入相关jar包

• junit
• mybatis
• mysql数据库
• spring相关的
• aop织入
• mybatis-spring【new】

编写相关配置文件

Mybatis

User

public class User {private int id;private String name;private String pwd;public User(int id, String name, String pwd) {this.id = id;this.name = name;this.pwd = pwd;}public User() {}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPwd() {return pwd;}public void setPwd(String pwd) {this.pwd = pwd;}@Overridepublic String toString() {return "User{" +"id=" + id +", name='" + name + '\'' +", pwd='" + pwd + '\'' +'}';}
}

UserMapper

public interface UserMapper {public List<User> selectUser();}

UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.kang.mapper.UserMapper"><select id="selectUser" resultType="user">select *from mybatis.user;</select>
</mapper>

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration><typeAliases><package name="com.kang.pojo"/></typeAliases><environments default="development"><environment id="development"><transactionManager type="JDBC"/><dataSource type="POOLED"><property name="driver" value="com.mysql.cj.jdbc.Driver"/><property name="url"value="jdbc:mysql://localhost:3306/mybatis?useSSL=false&amp;characterEncoding=UTF-8&amp;useUnicode=True&amp;serverTimezone=Asia/Shanghai"/><property name="username" value="root"/><property name="password" value="123"/></dataSource></environment></environments><mappers><mapper class="com.kang.mapper.UserMapper"/>
</mappers></configuration>

MyTest09

public class MyTest09 {@Testpublic void test() throws IOException {String resources ="mybatis-config.xml";InputStream in = Resources.getResourceAsStream(resources);SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(in);SqlSession sqlSession = sessionFactory.openSession(true);UserMapper mapper = sqlSession.getMapper(UserMapper.class);List<User> userList = mapper.selectUser();for (User user : userList){System.out.println(user);}}
}

整合Spring方法一

1.实体类 User

package com.kang.pojo;public class User {private int id;private String name;private String pwd;public User(int id, String name, String pwd) {this.id = id;this.name = name;this.pwd = pwd;}public User() {}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPwd() {return pwd;}public void setPwd(String pwd) {this.pwd = pwd;}@Overridepublic String toString() {return "User{" +"id=" + id +", name='" + name + '\'' +", pwd='" + pwd + '\'' +'}';}
}

2. UserMapper.class

public interface UserMapper {public List<User> selectUser();}

3. UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.kang.mapper.UserMapper"><select id="selectUser" resultType="user">select *from mybatis.user;</select>
</mapper>

4. mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration><typeAliases><package name="com.kang.pojo"/></typeAliases><!--&lt;!&ndash;设置&ndash;&gt;--><!--<settings>--><!--    <setting name="" value=""/>--><!--</settings>--></configuration>

5. spring-dao.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"xsi:schemaLocation="http://www.springframework.org/schema/beanshttps://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttps://www.springframework.org/schema/context/spring-context.xsd"><!--DataSource:使用Spring的数据源替换Mybatis的配置  c3p0 dbcp druid我们这里使用Spring提供的JDBC org.springframework.jdbc.datasource--><bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"><property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/><property name="url"value="jdbc:mysql://localhost:3306/mybatis?useSSL=false&amp;characterEncoding=UTF-8&amp;useUnicode=True&amp;serverTimezone=Asia/Shanghai"/><property name="username" value="root"/><property name="password" value="123"/></bean><!--sqlSessionFactory--><bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><property name="dataSource" ref="dataSource"/><!--绑定Mybatis配置文件--><property name="configLocation" value="classpath:mybatis-config.xml"/><property name="mapperLocations" value="classpath:com/kang/mapper/UserMapper.xml"/></bean><!--SqlSessionTemplate:就是我们使用的sqlSession--><bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"><!--没有set方法，只能使用构造器注入--><constructor-arg index="0" ref="sqlSessionFactory"/></bean><bean id="userMapper" class="com.kang.mapper.UserMapperImpl"><property name="sqlSession" ref="sqlSession"/></bean></beans>

6. UserMapperImpl.class

package com.kang.mapper;import com.kang.pojo.User;
import org.mybatis.spring.SqlSessionTemplate;import java.util.List;public class UserMapperImpl implements UserMapper {//我们的所有操作，原来都使用sqlSession来执行，现在使用sqlSessionTemolateprivate SqlSessionTemplate sqlSession;public void setSqlSession(SqlSessionTemplate sqlSession) {this.sqlSession = sqlSession;}public List<User> selectUser() {UserMapper mapper = sqlSession.getMapper(UserMapper.class);return mapper.selectUser();}}

7. MyTest09.class

public class MyTest09 {@Testpublic void test() throws IOException {ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml");UserMapper userMapper = context.getBean("userMapper", UserMapper.class);List<User> userList = userMapper.selectUser();for (User user : userList) {System.out.println(user);}System.out.println(userList);}
}

整合Spring方法二

1. UserMapperImpl2.class

public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper {public List<User> selectUser() {
//        SqlSession sqlSession = getSqlSession();
//        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
//        return mapper.selectUser();return getSqlSession().getMapper(UserMapper.class).selectUser();}
}

2. applicationContext.xml

    <bean id="userMapper2" class="com.kang.mapper.UserMapperImpl2"><property name="sqlSessionFactory" ref="sqlSessionFactory"/></bean>