一、问题概述

前段时间加了个aop日志切面打印，根据注解将入参信息全部打印出来。

在遇到上传文件这个接口时突然报了下面的错误，

错误对应关键代码，详见下面代码块11行。

2022-03-24 12:03:16.829 ERROR 1 --- [nio-8080-exec-4] c.i.x.exception.GlobalExceptionHandler   : write javaBean error, fastjson version 1.2.75, class org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile, write javaBean error, fastjson version 1.2.75, class org.springframework.web.multipart.MultipartFileResource, fieldName : resourcecom.alibaba.fastjson.JSONException: write javaBean error, fastjson version 1.2.75, class org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile, write javaBean error, fastjson version 1.2.75, class org.springframework.web.multipart.MultipartFileResource, fieldName : resource        at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:539) ~[fastjson-1.2.75.jar!/:na]        at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:149) ~[fastjson-1.2.75.jar!/:na]        at com.alibaba.fastjson.serializer.JSONSerializer.write(JSONSerializer.java:312) ~[fastjson-1.2.75.jar!/:na]        at com.alibaba.fastjson.JSON.toJSONString(JSON.java:769) ~[fastjson-1.2.75.jar!/:na]        at com.alibaba.fastjson.JSON.toJSONString(JSON.java:707) ~[fastjson-1.2.75.jar!/:na]        at com.alibaba.fastjson.JSON.toJSONString(JSON.java:672) ~[fastjson-1.2.75.jar!/:na]        at com.itheima.xiaotuxian.aspect.LogAspect.preHandle(LogAspect.java:119) ~[webCommon-1.0.0.jar!/:1.0.0]        at com.itheima.xiaotuxian.aspect.LogAspect.handle(LogAspect.java:56) ~[webCommon-1.0.0.jar!/:1.0.0]        at jdk.internal.reflect.GeneratedMethodAccessor127.invoke(Unknown Source) ~[na:na]        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]        at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]        at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:644) ~[spring-aop-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:633) ~[spring-aop-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70) ~[spring-aop-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95) ~[spring-aop-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749) ~[spring-aop-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691) ~[spring-aop-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at com.itheima.xiaotuxian.controller.material.PictureController$$EnhancerBySpringCGLIB$$fc0b9216.savePicture(<generated>) ~[classes!/:1.0.0]        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]        at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]        at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878) ~[spring-webmvc-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792) ~[spring-webmvc-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) ~[tomcat-embed-core-9.0.37.jar!/:4.0.FR]        at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.37.jar!/:4.0.FR]        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.37.jar!/:9.0.37]        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:92) ~[spring-web-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) ~[na:na]        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) ~[na:na]        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.37.jar!/:9.0.37]        at java.base/java.lang.Thread.run(Thread.java:832) ~[na:na]Caused by: com.alibaba.fastjson.JSONException: write javaBean error, fastjson version 1.2.75, class org.springframework.web.multipart.MultipartFileResource, fieldName : resource        at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:539) ~[fastjson-1.2.75.jar!/:na]        at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:149) ~[fastjson-1.2.75.jar!/:na]        at com.alibaba.fastjson.serializer.FieldSerializer.writeValue(FieldSerializer.java:318) ~[fastjson-1.2.75.jar!/:na]        at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:470) ~[fastjson-1.2.75.jar!/:na]        ... 66 common frames omittedCaused by: java.io.FileNotFoundException: MultipartFile resource [file] cannot be resolved to absolute file path        at org.springframework.core.io.AbstractResource.getFile(AbstractResource.java:138) ~[spring-core-5.2.8.RELEASE.jar!/:5.2.8.RELEASE]        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]        at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]        at com.alibaba.fastjson.util.FieldInfo.get(FieldInfo.java:571) ~[fastjson-1.2.75.jar!/:na]        at com.alibaba.fastjson.serializer.FieldSerializer.getPropertyValueDirect(FieldSerializer.java:143) ~[fastjson-1.2.75.jar!/:na]        at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:282) ~[fastjson-1.2.75.jar!/:na]        ... 69 common frames omitted

修改前，打印日志方法（报错行17行）

………………省略private String preHandle(ProceedingJoinPoint joinPoint, HttpServletRequest request) {        StringBuilder reqParam = new StringBuilder();        Signature signature = joinPoint.getSignature();        MethodSignature methodSignature = (MethodSignature) signature;        java.lang.reflect.Method targetMethod = methodSignature.getMethod();        Object[] args = joinPoint.getArgs();        Annotation[][] parameterAnnotations = targetMethod.getParameterAnnotations();        int i = 0;        for (Annotation[] annotations : parameterAnnotations) {            for1: for (Annotation annotation : annotations) {                if (annotation instanceof RequestParam) {                         reqParam.append(((RequestParam) annotation).name()).append(":").append(JSON.toJSONString(args[i]))                                .append(",");                    i++;                    break for1;                } else if (annotation instanceof PathVariable) {                    reqParam.append(JSON.toJSONString(args[i])).append(",");                    i++;                    break for1;                } else if (annotation instanceof RequestBody) {                    reqParam.append(JSON.toJSONString(args[i])).append(",");                    i++;                    break for1;                }            }        }        return reqParam.toString();    }………………省略

报错信息主要是:

write javaBean error, fastjson version 1.2.75, class org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile, write javaBean error, fastjson version 1.2.75, class org.springframework.web.multipart.MultipartFileResource, fieldName : resource

和MultipartFile resource [file] cannot be resolved to absolute file path

出错原因：MultipartFile文件无法转成JSON串

三、解决方案

分析知道了，是日志打印导致的。

切面日志将file转json，并打印了出来，此时转json失败了。

接口如下：

@Slf4j@RestController@RequestMapping("/material/picture")public class PictureController extends BaseController {@PostMapping    public MaterialUploadResultVo savePicture(@RequestParam(name = "file") MultipartFile file            , @RequestParam(name = "isMask", defaultValue = "false") Boolean isMask            , @RequestParam(name = "styleWidth", required = false) Integer styleWidth            , @RequestParam(name = "groupId", required = false) String groupId            , @RequestParam(name = "id", required = false) String id) {      // TODO 处理业务                      return ;    }}

切面日志代码，将@RequestParam(name = "file") MultipartFile file转成json，然后进行打印，此处，在转换json的时候，报错了，报错如问题概述中描述的

解决方案：增加判断20-24行已经解决了

修改后的切面日志如下

@Aspect@Component@Slf4jpublic class LogAspect {   private String preHandle(ProceedingJoinPoint joinPoint, HttpServletRequest request) {        StringBuilder reqParam = new StringBuilder();        Signature signature = joinPoint.getSignature();        MethodSignature methodSignature = (MethodSignature) signature;        java.lang.reflect.Method targetMethod = methodSignature.getMethod();        Object[] args = joinPoint.getArgs();        Annotation[][] parameterAnnotations = targetMethod.getParameterAnnotations();        int i = 0;        for (Annotation[] annotations : parameterAnnotations) {            for1: for (Annotation annotation : annotations) {                if (annotation instanceof RequestParam) {                    if(args[i] instanceof MultipartFile){                        reqParam.append(((RequestParam) annotation).name()).append(":").append(((MultipartFile)args[i]).getOriginalFilename())                                .append(",");                    }else{                        reqParam.append(((RequestParam) annotation).name()).append(":").append(JSON.toJSONString(args[i]))                                .append(",");                    }                    i++;                    break for1;                } else if (annotation instanceof PathVariable) {                    reqParam.append(JSON.toJSONString(args[i])).append(",");                    i++;                    break for1;                } else if (annotation instanceof RequestBody) {                    reqParam.append(JSON.toJSONString(args[i])).append(",");                    i++;                    break for1;                }            }        }        return reqParam.toString();    }  }

在面对日志打印中，一定要小心特殊参数，防止一些参数不能序列化

五、参考

1、记vue+elementUI+springBoot上传文件时因日志切面引起的错误