Spring AOP 后置通知修改响应httpstatus方式

Spring AOP 后置通知修改响应httpstatus方式

目录Spring AOP后置通知修改响应httpstatus1.定义Aspect2.使用3.ApiResponse响应体4.ApiUtilSpring AOP前后置通知最简单案例1.首先导jar包2.写applicationContext.xml3.项目架构4.Demo类5.前后置通知

Spring AOP后置通知修改响应httpstatus

1.定义Aspect

/**

* 响应体切面

* 后置通知修改httpstatus

*

* @author ： CatalpaFlat

*/

@Component

@Aspect

public class ApiResponseAspect {

private Logger logger = LoggerFactory.getLogger(this.getClass());

/**

* 切面

*/

private final String POINT_CUT = "execution(* com.xxx.web.controller..*(..))";

@Pointcut(POINT_CUT)

private void pointcut() {

}

@AfterReturning(value = POINT_CUT, returning = "apiResponse", argNames = "apiResponse")

public void doAfterReturningAdvice2(ApiResponse apiResponse) {

logger.info("apiResponse：" + apiResponse);

Integer state = apiResponse.getState();

if (state != null) {

ServletRequestAttributes res = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();

res.getResponse().setStatus(state);

}

}

}

2.使用

2.1.请求体

return ApiUtil.error(HttpStatus.UNSUPPORTED_MEDIA_TYPE.value(),"the request body is empty");

2.2.参数缺失

return ApiUtil.error(HttpStatus.BAD_REQUEST.value(),"Parameter id is empty");

2.3.权限认证

return ApiUtil.error(HttpStatus.UNAUTHORIZED.value(),"Current requests need user validation");

2.4.与资源存在冲突

return ApiUtil.error(HttpStatus.CONFLICT.value(),"Conflict with resources");

2.5.携带error信息

return ApiUtil.error(HttpStatus.BAD_REQUEST.value(),"There are some mistakes",obj);

3.ApiResponse响应体

public class ApiResponse {

private Integer state;

private String message;

private Object result;

private Object error;

}

4.ApiUtil

public class ApiUtil {

/**

* http回调错误

*/

public static ApiResponse error(Integer code, String msg) {

ApiResponse result = new ApiResponse();

resuhttp://lt.setState(code);

result.setMessage(msg);

return result;

}

/**

* http回调错误

*/

public static ApiResponse error(Integer code, String msg,Object error) {

ApiResponse result = new ApiResponse();

result.setState(code);

result.setMessage(msg);

result.setError(error);

return result;

}

}

Spring AOP前后置通知最简单案例

仅仅针对于spring

案例分析：

该案例执行Demo类中的三个方法，分别输出Demo1,Demo2,Demo3

我们以Demo2为切点，分别执行前置通知和后置通知

1.首先导jar包

2.写applicationContext.xml

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xmlns:aop="http://springframework.org/schema/aop"

xsi:schemaLocation="http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans.xsd

http://springframework.org/schema/aop

http://springframework.org/schema/aop/spring-aop.xsd">

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xmlns:aop="http://springframework.org/schema/aop"

xsi:schemaLocation="http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans.xsd

http://springframework.org/schema/aop

http://springframework.org/schema/aop/spring-aop.xsd">

3.项目架构

4.Demo类

package com.hym.bean;

public class Demo {

public void Demo1() {

System.out.println("Demo1");

}

public void Demo2() {

System.out.println("Demo2");

}

public void Demo3() {

System.out.println("Demo3");

}

}

5.前后置通知

前置通知：

类中方法需要实现MethodBeforeAdvice

package com.hym.advice;

import java.lang.reflect.Method;

import org.springframework.aop.AfterReturningAdvice;

public class MyAfterAdvice implements AfterReturningAdvice{

@Override

public void afterReturning(Object arg0, Method arg1, Object[] arg2, Object arg3) throws Throwable {

System.out.println("执行后置通知");

}

}

后置通知：

类中方法需要实现AfterReturningAdvice

该接口命名规范与前置通知有差异，需注意

package com.hym.advice;

import java.lang.reflect.Method;

import org.springframework.aop.AfterReturningAdvice;

public class MyAfterAdvice implements AfterReturningAdvice{

@Override

public void afterReturning(Object arg0, Method arg1, Object[] arg2, Object arg3) throws Throwable {

System.out.println("执行后置通知");

}

}

最后测试类：

package com.hym.test;

import org.apache.catalina.core.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.hym.bean.Demo;

public class Test {

public static void main(String[] args) {

ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");

Demo demo = ac.getBean("demo",Demo.class);

demo.Demo1();

demo.Demo2();

demo.Demo3();

}

}

最终执行结果：

AOP：面向切面编程

在执行Demo时，是纵向执行的，先Demo1,Demo2，Demo3.

但是我们以Demo2为切点，添加了前后置通知，这三个形成了一个横向的切面过程。

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