SpringMVC下载文件问题

一叶轻舟_ 2019-02-12 09:38:49
SpringMvc架构，
下载大文件时后台提示如下，下载小文件时没问题。


严重: Servlet.service() for servlet jsp threw exception

java.lang.IllegalStateException: getOutputStream() has already been called for this response

	at org.apache.catalina.connector.Response.getWriter(Response.java:662)

	at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:213)

	at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:104)

	at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:125)

	at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:118)

	at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:186)

	at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:125)

	at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:79)

	at org.apache.jsp.WEB_002dINF.jsp.common.error_jsp._jspService(error_jsp.java:130)

	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)

	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)

	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:743)

	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:603)

	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:542)

	at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:160)

	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)

	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228)

	at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011)

	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955)

	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)

	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)

	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)

	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)

	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)

	at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)

	at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)

	at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)

	at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)

	at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)

	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)

	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)

	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)

	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)

	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)

	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)

	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)

	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)

	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)

	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)

	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)

	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115)

	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)

	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2549)

	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2538)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

	at java.lang.Thread.run(Thread.java:748)

后台方法中调用的封装的方法


public static void downLoadBrowser(HttpServletRequest request, HttpServletResponse response, String fileName,String fileType, OutputStream outputStream){

		ByteArrayOutputStream byteArrayOutputStream  = null;

		OutputStream outputStreamDownload  = null;

		try {

			response.reset();

			response.resetBuffer();

			if (request.getHeader("user-agent").toLowerCase().contains("msie")||request.getHeader("user-agent").toLowerCase().contains("like gecko") ) {

				response.setHeader("Content-Disposition", "attachment; filename=\"" + new String(fileName.getBytes("GB2312"), "ISO8859-1" ) +fileType+ "\"");

			}else{

				response.setHeader("Content-Disposition", "attachment; filename=\"" + new String(fileName.getBytes("utf-8"), "ISO8859-1" ) +fileType+ "\"");

			}

			response.setContentType("application/octet-stream");

			response.setContentType("text/html;charset=UTF-8");

			byteArrayOutputStream = (ByteArrayOutputStream) outputStream;

			byte[] date = byteArrayOutputStream.toByteArray();

			outputStreamDownload = response.getOutputStream();

			outputStreamDownload.write(date);

		} catch (UnsupportedEncodingException e) {

			e.printStackTrace();

		} catch (IOException e) {

			e.printStackTrace();

		} finally {

			try {

				if(byteArrayOutputStream != null){

					byteArrayOutputStream.close();

				}

				if(outputStreamDownload != null){

					outputStreamDownload.close();

				}

			} catch (IOException e) {

				e.printStackTrace();

			}

		}

	}
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110成成 2019-02-13
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引用 3 楼 一叶轻舟_ 的回复:
[quote=引用 2 楼 110成成 的回复:]
个人感觉是因为你这里是一次性从文件流中读，如果遇到大文件，会导致内存不够，定义字节数组时，应设置一个合理的大小，多次读取。

真实情况是系统将N多个小文档合并成一个大文档，然后进行下载，现在6M的文档都无法导出，2M的文档没有问题。[/quote]
那你把数组大小就设置为2M，分批多次读取。
一叶轻舟_ 2019-02-12
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引用 2 楼 110成成 的回复:
个人感觉是因为你这里是一次性从文件流中读，如果遇到大文件，会导致内存不够，定义字节数组时，应设置一个合理的大小，多次读取。

真实情况是系统将N多个小文档合并成一个大文档，然后进行下载，现在6M的文档都无法导出，2M的文档没有问题。
110成成 2019-02-12
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个人感觉是因为你这里是一次性从文件流中读，如果遇到大文件，会导致内存不够，定义字节数组时，应设置一个合理的大小，多次读取。
一叶轻舟_ 2019-02-12
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百度查了错误信息，说是write和outputStream冲突，不知道该怎么改
一叶轻舟_ 2019-02-12
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有没有大神给解答下
SpringMVC文件下载-2021-04-12.txt
SpringMVC的文件下载方式
SpringMVC demo 完整源码实例下载
比较完整的SpringMVC的demo，里面包含了对数据增删改查，上传下载文件的实现，异常处理，拦截器，国际化等等功能的实现
SpringMVC帮助文档
springMVC开发实例、配置详解、快速入门
SpringMVC文件上传，多文件上传实例
在上一篇SpringMVC基础教程的源码基础上增加了文件上传，多文件上传
Spring+SpringMVC+Mybatis框架整合例子(SSM) 下载
本资源对应博文：http://blog.csdn.net/zhshulin/article/details/37956105，可以通过博文进行学习，不建议下载完整源码，博文有详细教程，以及代码。
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