我尝试在 jsp 中下载生成的 pdf。但是我的日志显示以下错误。我如何避免此错误。我的代码和错误如下
List<SDO> sdolist = new ArrayList<SDO>();
try{
sdolist = TravelAdvanceRequest.generatePDF(objSession,objList); //calling service
infoMsg="Pdf Generation Success";
if (sdolist != null) {
StringType stringMsg = (StringType) sdolist.get(0);
infoMsg="pdf generation success......";
System.out.println("pdf generation success......");
System.out.println("file path===========>>"+stringMsg.getString());
ServletOutputStream op =response.getOutputStream();
//throw new IllegalStateException("MyException");
String filename = stringMsg.getString() == null ? "" : stringMsg.getString();
File f = new File(filename);
int length = 0;
ServletContext context = getServletConfig().getServletContext();
String mimetype = context.getMimeType( filename );
if(f.isFile()){
response.setContentType( (mimetype != null) ? mimetype : "application/octet-stream" );
response.setContentLength( (int)f.length() );
response.setHeader( "Content-Disposition", "attachment; filename=\"Axis template for "+strCurrency+" account.pdf\"" );
byte[] bbuf = new byte[1000];
DataInputStream in = new DataInputStream(new FileInputStream(f));
while ((in != null) && ((length = in.read(bbuf)) != -1))
{
op.write(bbuf,0,length);
}
in.close();
response.getOutputStream().flush();
// op.flush();
op.close();
return;
}else{
System.out.println("Exception throws there is no such file in the Directory : "+filename);
}
}
}catch(IllegalStateException e1)
{
System.out.println("Illegal State Exception......"+e1.getMessage());
}
catch(Exception e)
{
System.out.println("Error in Pdf Creation......"+e.getMessage());
errMsg=e.getMessage();
}
java.lang.IllegalStateException: getOutputStream() has already been called for this response
at org.apache.catalina.connector.Response.getWriter(Response.java:619)
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.DebitDetails_jsp._jspService(DebitDetails_jsp.java:374)
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:369)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249)
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.tuscany.sca.host.webapp.TuscanyServletFilter.doFilter(TuscanyServletFilter.java:103)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
您收到此错误的原因是因为您正在使用 JSP 执行逻辑。 JSP 使用以下方式呈现其输出Writer的对象response，但你正在打电话getOutputStreamJSP 内部也是如此。因此，你会得到一个异常，因为你试图同时使用OutputStream和Writer同时。您还没有显示完整的 JSP 代码，但我猜您正在主要逻辑之后执行一些输出（可能是一些空白字符）。正如 @VigneshVino 所说，您应该在 servlet 内执行逻辑。 JSP 应该仅用于呈现视图。
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