【Spring】AOP面向切面编程（二）

2023-09-15 97

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简介： 【Spring】AOP面向切面编程（二）

3.2.前置通知

MyMethodBeforeAdvice.java

package com.csdn.xw.aop.advice;
import org.springframework.aop.MethodBeforeAdvice;
import java.lang.reflect.Method;
import java.util.Arrays;
/**
 * 买书、评论前加系统日志
 * @author Administrator
 *
 */
public class MyMethodBeforeAdvice implements MethodBeforeAdvice {
  @Override
  public void before(Method arg0, Object[] arg1, Object arg2) throws Throwable {
//    在这里，可以获取到目标类的全路径及方法及方法参数，然后就可以将他们写到日志表里去
    String target = arg2.getClass().getName();
    String methodName = arg0.getName();
    String args = Arrays.toString(arg1);
    System.out.println("【前置通知：系统日志】："+target+"."+methodName+"("+args+")被调用了");
  }
}

Spring-Context.xml

<!--目标对象-->
    <bean class="com.csdn.xw.aop.biz.impl.BookBizImpl" id="bookBiz"></bean>
<!--前置通知-->
    <bean class="com.csdn.xw.aop.advice.MyMethodBeforeAdvice" id="methodBeforeAdvice"></bean>
    <!--代理-->
    <bean class="org.springframework.aop.framework.ProxyFactoryBean" id="proxyFactoryBean">
        <!--配置目标对象-->
        <property name="target" ref="bookBiz"></property>
        <!--配置代理接口-->
        <property name="proxyInterfaces">
            <list>
                <value>com.csdn.xw.aop.biz.IBookBiz</value>
            </list>
        </property>
        <!--配置通知-->
        <property name="interceptorNames">
           <list>
               <value>methodBeforeAdvice</value>
           </list>
        </property>
    </bean>

Demo01.java(模拟)

package com.csdn.xw.aop.demo;
import com.csdn.xw.aop.biz.IBookBiz;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
 * @author Java方文山
 * @compay csdn_Java方文山
 * @create 2023-08-17-16:14
 */
public class demo01 {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext("/Spring-Context.xml");
        IBookBiz bookbiz = (IBookBiz) context.getBean("proxyFactoryBean");
        bookbiz.buy("Java方文山","《大话西游》",9.9d);
        bookbiz.comment("Java方文山","绝了");
    }
}

测试结果：

3.3.后置通知

MyAfterReturningAdvice.java

package com.csdn.xw.aop.advice;
import org.springframework.aop.AfterReturningAdvice;
import java.lang.reflect.Method;
import java.util.Arrays;
/**
 * 买书返利
 * @author Administrator
 *
 */
public class MyAfterReturningAdvice implements AfterReturningAdvice {
  @Override
  public void afterReturning(Object arg0, Method arg1, Object[] arg2, Object arg3) throws Throwable {
    String target = arg3.getClass().getName();
    String methodName = arg1.getName();
    String args = Arrays.toString(arg2);
    System.out.println("【后置通知：买书返利】："+target+"."+methodName+"("+args+")被调用了，"+"该方法被调用后的返回值为："+arg0);
  }
}

Spring-Context.xml

 <!--目标对象-->
    <bean class="com.csdn.xw.aop.biz.impl.BookBizImpl" id="bookBiz"></bean> 
<!--后置通知-->
    <bean class="com.csdn.xw.aop.advice.MyAfterReturningAdvice" id="myAfterReturningAdvice"></bean>
    <!--代理-->
    <bean class="org.springframework.aop.framework.ProxyFactoryBean" id="proxyFactoryBean">
        <!--配置目标对象-->
        <property name="target" ref="bookBiz"></property>
        <!--配置代理接口-->
        <property name="proxyInterfaces">
            <list>
                <value>com.csdn.xw.aop.biz.IBookBiz</value>
            </list>
        </property>
        <!--配置通知-->
        <property name="interceptorNames">
           <list>
               <value>myAfterReturningAdvice</value>
           </list>
        </property>

Demo01.java无变化我们直接看打印结果：

3.3.环绕通知

MyMethodInterceptor.java

package com.csdn.xw.aop.advice;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import java.util.Arrays;
/**
 * 环绕通知
 *  包含了前置和后置通知
 * 
 * @author Administrator
 *
 */
public class MyMethodInterceptor implements MethodInterceptor {
  @Override
  public Object invoke(MethodInvocation arg0) throws Throwable {
    String target = arg0.getThis().getClass().getName();
    String methodName = arg0.getMethod().getName();
    String args = Arrays.toString(arg0.getArguments());
    System.out.println("【环绕通知调用前：】："+target+"."+methodName+"("+args+")被调用了");
//    arg0.proceed()就是目标对象的方法
    Object proceed = arg0.proceed();
    System.out.println("【环绕通知调用后：】：该方法被调用后的返回值为："+proceed);
    return proceed;
  }
}

Spring-Context.xml

 <!--目标对象-->
    <bean class="com.csdn.xw.aop.biz.impl.BookBizImpl" id="bookBiz"></bean>
<!--环绕通知-->
    <bean class="com.csdn.xw.aop.advice.MyMethodInterceptor" id="methodInterceptor"></bean>
    <!--代理-->
    <bean class="org.springframework.aop.framework.ProxyFactoryBean" id="proxyFactoryBean">
        <!--配置目标对象-->
        <property name="target" ref="bookBiz"></property>
        <!--配置代理接口-->
        <property name="proxyInterfaces">
            <list>
                <value>com.csdn.xw.aop.biz.IBookBiz</value>
            </list>
        </property>
        <!--配置通知-->
        <property name="interceptorNames">
           <list>
               <value>methodInterceptor</value>
           </list>
        </property>
    </bean>

Demo01.java无变化我们直接看打印结果：

3.4.异常通知

MyThrowsAdvice.java

package com.csdn.xw.aop.advice;
import com.csdn.xw.aop.exception.PriceException;
import org.springframework.aop.ThrowsAdvice;
/**
 * 出现异常执行系统提示，然后进行处理。价格异常为例
 * @author Administrator
 *
 */
public class MyThrowsAdvice implements ThrowsAdvice {
  public void afterThrowing(PriceException ex) {
    System.out.println("【异常通知】：当价格发生异常，那么执行此处代码块！！！");
  }
}

Spring-Context.xml

 <!--目标对象-->
    <bean class="com.csdn.xw.aop.biz.impl.BookBizImpl" id="bookBiz"></bean>
<!--异常通知-->
    <bean class="com.csdn.xw.aop.advice.MyThrowsAdvice" id="advice"></bean>
    <!--代理-->
    <bean class="org.springframework.aop.framework.ProxyFactoryBean" id="proxyFactoryBean">
        <!--配置目标对象-->
        <property name="target" ref="bookBiz"></property>
        <!--配置代理接口-->
        <property name="proxyInterfaces">
            <list>
                <value>com.csdn.xw.aop.biz.IBookBiz</value>
            </list>
        </property>
        <!--配置通知-->
        <property name="interceptorNames">
           <list>
               <value>advice</value>
           </list>
        </property>
    </bean>

Demo01.java(模拟)我们将价格改为负数

package com.csdn.xw.aop.demo;
import com.csdn.xw.aop.biz.IBookBiz;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
 * @author Java方文山
 * @compay csdn_Java方文山
 * @create 2023-08-17-16:14
 */
public class demo01 {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext("/Spring-Context.xml");
        IBookBiz bookbiz = (IBookBiz) context.getBean("proxyFactoryBean");
        bookbiz.buy("Java方文山","《大话西游》",-9.9d);
        bookbiz.comment("Java方文山","绝了");
    }
}

测试结果：

3.4.过滤通知

Spring-Context.xml

<!--目标对象-->
    <bean class="com.csdn.xw.aop.biz.impl.BookBizImpl" id="bookBiz"></bean>
    <!--后置通知-->
    <bean class="com.csdn.xw.aop.advice.MyAfterReturningAdvice" id="myAfterReturningAdvice"></bean>
    <!--过滤配置-->
    <bean class="org.springframework.aop.support.RegexpMethodPointcutAdvisor" id="regexpMethodPointcutAdvisor">
        <property name="advice" ref="myAfterReturningAdvice"></property>
        <property name="pattern" value=".*buy"></property>
    </bean>
    <!--代理-->
    <bean class="org.springframework.aop.framework.ProxyFactoryBean" id="proxyFactoryBean">
        <!--配置目标对象-->
        <property name="target" ref="bookBiz"></property>
        <!--配置代理接口-->
        <property name="proxyInterfaces">
            <list>
                <value>com.csdn.xw.aop.biz.IBookBiz</value>
            </list>
        </property>
        <!--配置通知-->
        <property name="interceptorNames">
           <list>
               <value>regexpMethodPointcutAdvisor</value>
           </list>
        </property>
    </bean>