Servlet.service() for servlet jsp threw exception java.lang.Il在jsp中使用jspsmartupload组件下载文件时将抛出异常的解决方案

来源：互联网发布：便宜好用的爽肤水知乎编辑：程序博客网时间：2024/05/19 17:58

严重: Servlet.service() for servlet jsp threw exceptionjava.lang.IllegalStateException: getOutputStream() has already been called for this responseat org.apache.catalina.connector.Response.getWriter(Response.java:611)at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:198)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:188)at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:118)at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:77)at org.apache.jsp.downAction_jsp._jspService(downAction_jsp.java:82)at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)at java.lang.Thread.run(Thread.java:619)

解决:

由于jsp container在处理完成请求后会调用releasePageContet方法释放所用的PageContext object,并且同时调用getWriter方法,由于getWriter方法与在jsp页面中使用流相关的getOutputStream方法冲突,所以会造成这种异常,

解决办法是:只需要在jsp页面的最后加上两条语句:

out.clear();

out=pageContext.pushBody();即可(其中out,pageContext均为jsp内置对象!)