解決springboot全局異常處理與aop日志處理中@afterthrowing失效問題的方法

本文講解"解決springboot全局異常處理與aop日志處理中@afterthrowing失效問題的方法"，希望能夠解決相關問題。

• 一、前言

• 二、問題

• 三、失效場景

一、前言

• 在實際業務場景中，我們通常會使用全局異常處理機制，也就是在業務代碼發生異常的時候，攔截異常并進行統一的處理，然后以json格式返回給前端。

• 同時我們也會使用aop進行操作日志記錄，在不發生異常時，可以使用四種advice方式記錄操作日志：@before(“”)，@after(“”)、 @afterreturning(“”)、 @around(“”)。當發生異常時，使用@afterthrowing(value = “”,throwing = “e”)進行日志記錄。

二、問題

同時使用上述兩種方式，可能出現某一種失效的場景。

三、失效場景

失效場景一： 如果采用前后端不分離架構，采用下屬代碼返回前端響應結果，如果統一異常處理執行順序在@afterthrowing之前，就會出現@afterthrowing中不執行情況。前后端分離架構不會出現此問題。

string?xrequestedwith?=?request.getheader("x-requested-with");
if?("xmlhttprequest".equals(xrequestedwith))?{
????response.setcontenttype("application/plain;charset=utf-8");
????printwriter?writer?=?response.getwriter();
????writer.write(communityutil.getjsonstring(1,?"服務器異常!"));
}?else?{
????response.sendredirect(request.getcontextpath()?+?"/error");
}

解決方案：讓aop日志處理類實現ordered 接口，并重寫getorder()方法，使其返回值為1，返回值越小，執行的順序越靠前，使其執行順序優先于全部異常處理類。

@component
@aspect
public?class?logaspecttest?implements?ordered?{
????@override
????public?int?getorder()?{
????????return?1;
????}
????????@afterthrowing(value?=?"pointcut()",throwing?=?"e")
????public?void?afterthrowing(joinpoint?joinpoint,exception?e){
????????string?classname?=?joinpoint.gettarget().getclass().getname();
????????string?methodname?=?joinpoint.getsignature().getname();
????????system.out.println("classname?is?:?"?+?classname?+?".?methodname?is?:?"?+?methodname);
????????system.out.println("afterthrowing?excute········"?+?e.getmessage());
????????e.printstacktrace();
????}
}

失效場景二：如果使用了 @around(“”)，在執行 joinpoint.proceed()方法時，捕獲了異常，會導致全局異常處理無法收到異常，因此失效。

@around("pointcut()")
public?void?around(proceedingjoinpoint?joinpoint)?throws?throwable?{
????string?classname?=?joinpoint.gettarget().getclass().getname();
????string?methodname?=?joinpoint.getsignature().getname();
????system.out.println("classname?is?:?"?+?classname?+?".?methodname?is?:?"?+?methodname);
????system.out.println("around?excute?before?········");
????object?obj?=?null;
????try?{
????????obj?=?joinpoint.proceed();
????}?catch?(throwable?e)?{
????????system.out.println("我捕獲了異常");
????}
????system.out.println("obj?對象：?"?+?obj);
????system.out.println("around?excute?after?········");
}

解決方案：不要進行異常捕獲，或者捕獲后重新拋出異常。

@around("pointcut()")
public?void?around(proceedingjoinpoint?joinpoint)?throws?throwable?{
????string?classname?=?joinpoint.gettarget().getclass().getname();
????string?methodname?=?joinpoint.getsignature().getname();
????system.out.println("classname?is?:?"?+?classname?+?".?methodname?is?:?"?+?methodname);
????system.out.println("around?excute?before?········");
????object?obj?=?null;
????try?{
????????obj?=?joinpoint.proceed();
????}?catch?(throwable?e)?{
????????system.out.println("我捕獲了異常");
????????throw?new?runtimeexception("執行失敗",e);
????}
????system.out.println("obj?對象：?"?+?obj);
????system.out.println("around?excute?after?········");
}

4、測試全部代碼

package?com.nowcoder.community.aspect;
import?org.aspectj.lang.joinpoint;
import?org.aspectj.lang.proceedingjoinpoint;
import?org.aspectj.lang.annotation.*;
import?org.springframework.core.ordered;
import?org.springframework.stereotype.component;
import?org.springframework.web.context.request.requestattributes;
import?org.springframework.web.context.request.requestcontextholder;
import?org.springframework.web.context.request.servletrequestattributes;
/**
?*?@description?aop?日志記錄
?*/
@component
@aspect
public?class?logaspecttest?implements?ordered?{
????/**
?????*?定義執行順序的優先級，值越小，優先級越高
?????*?@return
?????*/
????@override
????public?int?getorder()?{
????????return?1;
????}
????/**
?????*?定義切點（織入點）
?????*??execution(*?com.nowcoder.community.controller.*.*(..))
?????*??????-?第一個?*?表示?支持任意類型返回值的方法
?????*??????-?com.nowcoder.community.controller?表示這個包下的類
?????*??????-?第二個?*?表示?controller包下的任意類
?????*??????-?第三個?*?表示?類中的任意方法
?????*??????-?(..)?表示方法可以擁有任意參數
?????*???可以根據自己的需求替換。
?????*
?????*/
????@pointcut("execution(*?com.nowcoder.community.controller.*.*(..))")
????public?void?pointcut(){
????}
????/**
?????*?定義?advice?通知
?????*????-?1.?@before?目標方法執行之前
?????*????-?2.?@after??目標方法執行之后
?????*????-?3.?@afterreturning?目標方法返回執行結果之后
?????*????-?4.?@afterthrowing?目標方法拋出異常后
?????*????-?5.?@around?可以使用proceedingjoinpoint?joinpoint，獲取目標對象，通過動態代理，代理目標類執行，在目標對象執行前后均可
?????*/
????@before("pointcut()")
????public?void?before(joinpoint?joinpoint){
????????string?classname?=?joinpoint.gettarget().getclass().getname();
????????string?methodname?=?joinpoint.getsignature().getname();
????????servletrequestattributes?attributes?=?(servletrequestattributes)requestcontextholder.getrequestattributes();
????????if?(attributes?==?null){
????????????return;
????????}
????????//?請求ip
????????string?ip?=?attributes.getrequest().getremotehost();
????????//?請求路徑
????????string?requesturi?=?attributes.getrequest().getrequesturi();
????????//?請求方法
????????string?requestmethod?=?attributes.getrequest().getmethod();
????????system.out.println(string.format("用戶：?[%s]?的請求路徑為：[%s],?請求方式為：?[%s],請求類名為：?[%s],?請求方法名為：?[%s]",?ip,requesturi,
????????????????requestmethod,classname,methodname));
????????system.out.println("before?excute········");
????}
????@after("pointcut()")
????public?void?after(joinpoint?joinpoint){
????????string?classname?=?joinpoint.gettarget().getclass().getname();
????????string?methodname?=?joinpoint.getsignature().getname();
????????servletrequestattributes?attributes?=?(servletrequestattributes)requestcontextholder.getrequestattributes();
????????if?(attributes?==?null){
????????????return;
????????}
????????//?請求ip
????????string?ip?=?attributes.getrequest().getremotehost();
????????//?請求路徑
????????string?requesturi?=?attributes.getrequest().getrequesturi();
????????//?請求方法
????????string?requestmethod?=?attributes.getrequest().getmethod();
????????system.out.println(string.format("用戶：?[%s]?的請求路徑為：[%s],?請求方式為：?[%s],請求類名為：?[%s],?請求方法名為：?[%s]",?ip,requesturi,
?????????????????????????????????????????requestmethod,classname,methodname));
????????system.out.println("after?excute········");
????}
????@afterreturning("pointcut()")
????public?void?afterreturning(joinpoint?joinpoint){
????????string?classname?=?joinpoint.gettarget().getclass().getname();
????????string?methodname?=?joinpoint.getsignature().getname();
????????servletrequestattributes?attributes?=?(servletrequestattributes)requestcontextholder.getrequestattributes();
????????if?(attributes?==?null){
????????????return;
????????}
????????//?請求ip
????????string?ip?=?attributes.getrequest().getremotehost();
????????//?請求路徑
????????string?requesturi?=?attributes.getrequest().getrequesturi();
????????//?請求方法
????????string?requestmethod?=?attributes.getrequest().getmethod();
????????system.out.println(string.format("用戶：?[%s]?的請求路徑為：[%s],?請求方式為：?[%s],請求類名為：?[%s],?請求方法名為：?[%s]",?ip,requesturi,
?????????????????????????????????????????requestmethod,classname,methodname));
????????system.out.println("afterreturning?excute········");
????}
????@afterthrowing(value?=?"pointcut()",throwing?=?"e")
????public?void?afterthrowing(joinpoint?joinpoint,exception?e){
????????string?classname?=?joinpoint.gettarget().getclass().getname();
????????string?methodname?=?joinpoint.getsignature().getname();
????????servletrequestattributes?attributes?=?(servletrequestattributes)requestcontextholder.getrequestattributes();
????????if?(attributes?==?null){
????????????return;
????????}
????????//?請求ip
????????string?ip?=?attributes.getrequest().getremotehost();
????????//?請求路徑
????????string?requesturi?=?attributes.getrequest().getrequesturi();
????????//?請求方法
????????string?requestmethod?=?attributes.getrequest().getmethod();
????????system.out.println(string.format("用戶：?[%s]?的請求路徑為：[%s],?請求方式為：?[%s],請求類名為：?[%s],?請求方法名為：?[%s],請求失敗原因：?[%s]",?ip,
?????????????????????????????????????????requesturi,?requestmethod,classname,methodname,e.getmessage()+e.getcause()));
????????system.out.println("afterthrowing?excute········"?+?e.getmessage());
????????e.printstacktrace();
????}
????@around("pointcut()")
????public?void?around(proceedingjoinpoint?joinpoint)?throws?throwable?{
????????string?classname?=?joinpoint.gettarget().getclass().getname();
????????string?methodname?=?joinpoint.getsignature().getname();
????????system.out.println("classname?is?:?"?+?classname?+?".?methodname?is?:?"?+?methodname);
????????servletrequestattributes?attributes?=?(servletrequestattributes)requestcontextholder.getrequestattributes();
????????if?(attributes?==?null){
????????????return;
????????}
????????//?請求ip
????????string?ip?=?attributes.getrequest().getremotehost();
????????//?請求路徑
????????string?requesturi?=?attributes.getrequest().getrequesturi();
????????//?請求方法
????????string?requestmethod?=?attributes.getrequest().getmethod();
????????system.out.println(string.format("用戶：?[%s]?的請求路徑為：[%s],?請求方式為：?[%s],請求類名為：?[%s],?請求方法名為：?[%s]",?ip,requesturi,
?????????????????????????????????????????requestmethod,classname,methodname));
????????object?obj?=?null;
????????try?{
????????????obj?=?joinpoint.proceed();
????????}?catch?(throwable?e)?{
????????????system.out.println("我捕獲了異常");
????????????throw?new?runtimeexception("執行失敗",e);
????????}
????????system.out.println(string.format("用戶：?[%s]?的請求路徑為：[%s],?請求方式為：?[%s],請求類名為：?[%s],?請求方法名為：?[%s]",?ip,requesturi,
?????????????????????????????????????????requestmethod,classname,methodname));
????????system.out.println("around?excute?after?········");
????}
}

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