后置通知修改响应httpstatus
CatalpaFlat 人气:0Spring 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(); result.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
<?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:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- 将Demo放入bean容器中 --> <bean id="demo" class="com.hym.bean.Demo"></bean> <!-- 将前置通知和后置通知也放入到bean容器中 id 自己任意取,后续引用就取id ,class是全类名 --> <bean id ="myBefore" class="com.hym.advice.MyBeforeAdvice"></bean> <bean id ="myAfter" class="com.hym.advice.MyAfterAdvice"></bean> <aop:config> <!-- 围绕的哪一个切点进行前后置通知 execution(* 全类名+方法名 ) 这是固定写法 id 自己取名,后续引用就取id--> <aop:pointcut expression="execution(* com.hym.bean.Demo.Demo2())" id="mypoint"/> <!-- 通知 根据advice-ref中的值 来区分是前置通知还是后置通知 。 值就是前后置通知的id pointcut-ref 是切点的id--> <aop:advisor advice-ref="myBefore" pointcut-ref="mypoint"/> <aop:advisor advice-ref="myAfter" pointcut-ref="mypoint"/> </aop:config> <!-- r如果存在两个参数,name和id 那么用以下的写法 --> <!-- <aop:config> <aop:pointcut expression="execution(* com.hym.bean.Demo.Demo2(String,int) and args(name,id)) " id=""/> </aop:config> --> </beans>
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。
以上为个人经验,希望能给大家一个参考,也希望大家多多支持。
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