解决springboot 多线程使用MultipartFile读取excel文件内容报错问题
springboot项目开启多线程
启动类加注解开启 @EnableAsync,实现类方法加注解 @Async
前端页面
报错信息
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 | java.io.FileNotFoundException: C:\Users\dongao\AppData\Local\Temp\tomcat. 1255209411477782290.8051 \work\Tomcat\localhost\ROOT\upload_7d7b99e5_38da_4a03_93e0_bff20cb48022_00000000.tmp (系统找不到指定的文件。) at java.io.FileInputStream.open0(Native Method) at java.io.FileInputStream.open(FileInputStream.java: 195 ) at java.io.FileInputStream.<init>(FileInputStream.java: 138 ) at org.apache.tomcat.util.http.fileupload.disk.DiskFileItem.getInputStream(DiskFileItem.java: 194 ) at org.apache.catalina.core.ApplicationPart.getInputStream(ApplicationPart.java: 100 ) at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile.getInputStream(StandardMultipartHttpServletRequest.java: 250 ) at com.dongao.project.utils.UploadUtil.readExcel(UploadUtil.java: 156 ) at com.dongao.project.utils.UploadUtil.readExcelToMap(UploadUtil.java: 98 ) at com.dongao.project.importbatch.service.ImportBatchServiceImpl.importData(ImportBatchServiceImpl.java: 161 ) at com.dongao.project.importbatch.service.ImportBatchServiceImpl$$FastClassBySpringCGLIB$$440ed2f6.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java: 218 ) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java: 749 ) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java: 163 ) at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java: 88 ) at com.dongao.support.cat.CatUtils.proceed(CatUtils.java: 18 ) at com.dongao.support.cat.CatSpringAop.getObject(CatSpringAop.java: 26 ) at com.dongao.support.cat.CatSpringAop.aroundServiceMethod(CatSpringAop.java: 22 ) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java: 62 ) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 43 ) at java.lang.reflect.Method.invoke(Method.java: 498 ) at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java: 644 ) at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java: 633 ) at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java: 70 ) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java: 186 ) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java: 294 ) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java: 98 ) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java: 186 ) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java: 93 ) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java: 186 ) at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java: 688 ) at com.dongao.project.importbatch.service.ImportBatchServiceImpl$$EnhancerBySpringCGLIB$$a16c4d4e.importData(<generated>) at com.dongao.project.importbatch.service.ImportBatchServiceImpl$$FastClassBySpringCGLIB$$440ed2f6.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java: 218 ) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java: 749 ) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java: 163 ) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java: 294 ) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java: 98 ) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java: 186 ) at org.springframework.aop.interceptor.AsyncExecutionInterceptor.lambda$invoke$ 0 (AsyncExecutionInterceptor.java: 115 ) at java.util.concurrent.FutureTask.run(FutureTask.java: 266 ) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java: 1149 ) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java: 624 ) at java.lang.Thread.run(Thread.java: 748 ) : 36 : 46.137 25472 [threadPoolTaskExecutor- 1 ] INFO com.ruoyi.framework.datasource.DynamicDataSourceContextHolder - [setDataSourceType, 26 ] - 切换到SLAVE数据源 : 36 : 46.163 25472 [threadPoolTaskExecutor- 1 ] ERROR org.springframework.aop.interceptor.SimpleAsyncUncaughtExceptionHandler - [handleUncaughtException, 39 ] - Unexpected exception occurred invoking async method: public void com.dongao.project.importbatch.service.ImportBatchServiceImpl.importData(org.springframework.web.multipart.MultipartFile,java.lang.Long) throws java.lang.Exception java.lang.IndexOutOfBoundsException: Index: 0 , Size: 0 at java.util.ArrayList.rangeCheck(ArrayList.java: 653 ) at java.util.ArrayList.get(ArrayList.java: 429 ) at com.dongao.project.importbatch.service.ImportBatchServiceImpl.importData(ImportBatchServiceImpl.java: 178 ) at com.dongao.project.importbatch.service.ImportBatchServiceImpl$$FastClassBySpringCGLIB$$440ed2f6.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java: 218 ) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java: 749 ) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java: 163 ) at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java: 88 ) at com.dongao.support.cat.CatUtils.proceed(CatUtils.java: 18 ) at com.dongao.support.cat.CatSpringAop.getObject(CatSpringAop.java: 26 ) at com.dongao.support.cat.CatSpringAop.aroundServiceMethod(CatSpringAop.java: 22 ) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java: 62 ) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 43 ) at java.lang.reflect.Method.invoke(Method.java: 498 ) at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java: 644 ) at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java: 633 ) at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java: 70 ) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java: 186 ) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java: 294 ) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java: 98 ) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java: 186 ) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java: 93 ) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java: 186 ) at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java: 688 ) at com.dongao.project.importbatch.service.ImportBatchServiceImpl$$EnhancerBySpringCGLIB$$a16c4d4e.importData(<generated>) at com.dongao.project.importbatch.service.ImportBatchServiceImpl$$FastClassBySpringCGLIB$$440ed2f6.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java: 218 ) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java: 749 ) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java: 163 ) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java: 294 ) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java: 98 ) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java: 186 ) at org.springframework.aop.interceptor.AsyncExecutionInterceptor.lambda$invoke$ 0 (AsyncExecutionInterceptor.java: 115 ) at java.util.concurrent.FutureTask.run(FutureTask.java: 266 ) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java: 1149 ) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java: 624 ) at java.lang.Thread.run(Thread.java: 748 ) |
问题分析
前端页面传过来的文件会存在临时文件夹中,如下
C:\Users\dongao\AppData\Local\Temp\tomcat.1255209411477782290.8051\work\Tomcat\localhost\ROOT\
这个时候如果单线程操作,即正常程序流程解析是不会有问题的;
如果走异步多线程解析文件,主线程已经结束了,临时文件会被清空,这时候再来读取文件就会报错
java.io.FileNotFoundException: C:\Users\dongao\AppData\Local\Temp\tomcat.1255209411477782290.8051\work\Tomcat\localhost\ROOT\upload_7d7b99e5_38da_4a03_93e0_bff20cb48022_00000000.tmp (系统找不到指定的文件。)
问题处理
由于主线程结束,临时文件被清空,导致多线程业务类无法获取到临时文件而报错(系统找不到指定的文件。),此时可以在主线程中转换获取文件流信息
InputStream is = file.getInputStream();
文件流信息存储在内存中,多线程时也可以获取到文件内容,解决问题。
以上这篇解决springboot 多线程使用MultipartFile读取excel文件内容报错问题就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持脚本之家。

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