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httpstatus
• 1.定义Aspect
• 2.使用
• 3.ApiResponse响应体
• 4.ApiUtil
• Spring AOP前后置通知最简单案例
• 1.首先导jar包
• 2.写applicationContext.xml
• 3.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();
        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

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脚本之家。