InputStream has already been read - do not use InputStreamResource if a stream needs to be read mult-优快云博客

本文链接：https://blog.youkuaiyun.com/zyw0101/article/details/139528673

错误

java.lang.IllegalStateException: InputStream has already been read - do not use InputStreamResource if a stream needs to be read multiple times
	at org.springframework.core.io.InputStreamResource.getInputStream(InputStreamResource.java:97) ~[spring-core-6.1.5.jar:6.1.5]
	at org.springframework.http.converter.ResourceHttpMessageConverter.writeContent(ResourceHttpMessageConverter.java:147) ~[spring-web-6.1.5.jar:6.1.5]
	at org.springframework.http.converter.ResourceHttpMessageConverter.writeInternal(ResourceHttpMessageConverter.java:139) ~[spring-web-6.1.5.jar:6.1.5]
	at org.springframework.http.converter.ResourceHttpMessageConverter.writeInternal(ResourceHttpMessageConverter.java:46) ~[spring-web-6.1.5.jar:6.1.5]
	at org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:235) ~[spring-web-6.1.5.jar:6.1.5]
	at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:300) ~[spring-webmvc-6.1.5.jar:6.1.5]
	at org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:245) ~[spring-webmvc-6.1.5.jar:6.1.5]
	at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:78) ~[spring-web-6.1.5.jar:6.1.5]
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:136) ~[spring-webmvc-6.1.5.jar:6.1.5]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:925) ~[spring-webmvc-6.1.5.jar:6.1.5]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:830) ~[spring-webmvc-6.1.5.jar:6.1.5]
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-6.1.5.jar:6.1.5]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089) ~[spring-webmvc-6.1.5.jar:6.1.5]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979) ~[spring-webmvc-6.1.5.jar:6.1.5]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) ~[spring-webmvc-6.1.5.jar:6.1.5]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903) ~[spring-webmvc-6.1.5.jar:6.1.5]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564) ~[tomcat-embed-core-10.1.19.jar:6.0]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) ~[spring-webmvc-6.1.5.jar:6.1.5]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) ~[tomcat-embed-core-10.1.19.jar:6.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-10.1.19.jar:10.1.19]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
	at com.alibaba.druid.support.jakarta.WebStatFilter.doFilter(WebStatFilter.java:113) ~[druid-1.2.22.jar:?]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.1.5.jar:6.1.5]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.1.5.jar:6.1.5]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.1.5.jar:6.1.5]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.5.jar:6.1.5]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) [tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) [tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482) [tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) [tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) [tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) [tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:391) [tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) [tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:896) [tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1744) [tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) [tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) [tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) [tomcat-embed-core-10.1.19.jar:10.1.19]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63) [tomcat-embed-core-10.1.19.jar:10.1.19]
	at java.base/java.lang.Thread.run(Thread.java:833) [?:?]

场景

springboot读取文件转成InputStreamResource，操作InputStreamResource

File file = new File("E:\\test.png");
InputStream inputStream = new FileInputStream(file);
InputStreamResource inputStreamResource = new InputStreamResource(inputStream);
long fileLength = inputStreamResource.contentLength();
return ResponseEntity.ok()
                    .contentLength(fileLength)
                    .contentType(MediaType.APPLICATION_OCTET_STREAM)
                    .body(inputStreamResource);

原因

InputStreamResource只能读取一次内容，当InputStreamResource 被读取一次后，第二次读取就会抛异常

解决办法

使用ByteArrayResource替换InputStreamResource

File file = new File("E:\\test.png");
InputStream inputStream = new FileInputStream(file);
ByteArrayResource byteArrayResource = new ByteArrayResource(inputStream.readAllBytes());
long fileLength = byteArrayResource.contentLength();
return ResponseEntity.ok()
                    .contentLength(fileLength)
                    .contentType(MediaType.APPLICATION_OCTET_STREAM)
                    .body(byteArrayResource);