最近在做一個文件下載的功能，測試中發現一個很奇怪的異常java.io.IOException: UT010029: Stream is closed；

我的實際下載文件邏輯代碼如下：

@RequestMapping(value = "/bill/testDownload") public Map<String, String> testDownload(@RequestParam(value = "test",required = false) String test,HttpServletResponse response) { Map<String, String> returnMap = new HashMap<String, String>(); returnMap.put("returnCode", "SUCCESS"); logger.info("makeStatementFileService.billDownload result:" + returnMap.toString()); byte[] fileDatas = "測試文件下載".getBytes(); String fileName = "test.txt"; response.setHeader("content-type", "text/html"); response.setHeader("Content-Disposition", "attachment;filename=" + fileName); response.setCharacterEncoding("UTF-8"); ServletOutputStream out = null; try{ out = response.getOutputStream(); out.write(fileDatas); out.flush(); }catch (Exception e) { logger.info("testDownload occurs exception:" + e.getMessage()); }finally { if(null != out){ try{ out.close(); }catch (Exception e) { logger.info("testDownload close OutputStream occurs exception:" + e.getMessage()); } } } return returnMap; } 運行后在瀏覽器里測試發現文件下載成功，但實際上后臺服務器確拋出了下面的異常： java.io.IOException: UT010029: Stream is closed
?? ?at io.undertow.servlet.spec.ServletOutputStreamImpl.write(ServletOutputStreamImpl.java:132)
?? ?at org.springframework.cloud.sleuth.instrument.web.TraceServletOutputStream.write(TraceServletOutputStream.java:120)
?? ?at org.springframework.security.web.util.OnCommittedResponseWrapper$SaveContextServletOutputStream.write(OnCommittedResponseWrapper.java:639)
?? ?at com.fasterxml.jackson.core.json.UTF8JsonGenerator._flushBuffer(UTF8JsonGenerator.java:2039)
?? ?at com.fasterxml.jackson.core.json.UTF8JsonGenerator.flush(UTF8JsonGenerator.java:1051)
?? ?at com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:953)
?? ?at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:292)
?? ?at org.springframework.http.converter.AbstractGenericHttpMessageConverter.write(AbstractGenericHttpMessageConverter.java:106)
?? ?at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:231)
?? ?at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:174)
?? ?at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:81)
?? ?at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:113)
?? ?at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
?? ?at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
?? ?at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
?? ?at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
?? ?at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
?? ?at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
?? ?at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
?? ?at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
?? ?at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
?? ?at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
?? ?at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
?? ?at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
?? ?at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)
?? ?at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
?? ?at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
?? ?at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
?? ?at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:110)
?? ?at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
?? ?at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
?? ?at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
?? ?at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317)
?? ?at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)
?? ?at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)
?? ?at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
?? ?at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)
?? ?at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
?? ?at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)
?? ?at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
?? ?at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
?? ?at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
?? ?at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170)
?? ?at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
?? ?at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
?? ?at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
?? ?at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
?? ?at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
?? ?at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64)
?? ?at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
?? ?at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
?? ?at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
?? ?at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
?? ?at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
?? ?at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
?? ?at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
?? ?at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)
?? ?at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)
?? ?at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
?? ?at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
?? ?at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
?? ?at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
?? ?at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
?? ?at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
?? ?at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
?? ?at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
?? ?at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105)
?? ?at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
?? ?at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
?? ?at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
?? ?at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
?? ?at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
?? ?at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
?? ?at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
?? ?at org.springframework.cloud.sleuth.instrument.web.TraceFilter.doFilter(TraceFilter.java:153)
?? ?at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
?? ?at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
?? ?at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
?? ?at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
?? ?at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
?? ?at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
?? ?at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106)
?? ?at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
?? ?at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
?? ?at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
?? ?at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
?? ?at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
?? ?at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
?? ?at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
?? ?at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
?? ?at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
?? ?at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
?? ?at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
?? ?at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
?? ?at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
?? ?at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
?? ?at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
?? ?at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
?? ?at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)
?? ?at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)
?? ?at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)
?? ?at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)
?? ?at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
?? ?at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
?? ?at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)
?? ?at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
?? ?at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)
?? ?at io.undertow.server.Connectors.executeRootHandler(Connectors.java:211)
?? ?at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:809)
?? ?at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
?? ?at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
?? ?at java.lang.Thread.run(Thread.java:745)

從異常日志和Debug跟蹤，發現異常是從Spring框架層拋出的，自己的下載業務邏輯并未出現異常，就分析猜測：問題可能出在out.close()上，果然如我所料，我把流關閉注釋掉后就正常了。后面進一步測試發現：如果要保留關閉流的習慣，那testDownload方法就不要有任何返回值，這樣也是ok的。

總結：

1、使用SpringMVC框架時，在我們的業務代碼中處理完業務邏輯后，不要對HttpServletResponse對象的ServletOutputStream做流關閉處理；

2、使用SpringMVC框架時，對于下載文件的方法請不要有任何返回值，因為我們寫完業務邏輯后Spring框架層還會做一些額外的工作（可能會用到ServletOutputStream對象，所以不能關閉）。

轉載于:https://my.oschina.net/u/3499964/blog/3010661

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