How to use outputStream to write data to web client?

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Terry

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Oct 30, 2012, 12:52:52 PM10/30/12

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Hi John,

I'm trying to use this good framework in my new proj. And I just want to know is it possible to use outputStream(httpServletResponse) to write data(file) to web browser?

Now I created a controller and a method in it, and tried to writer a xls file to the client:

public String testFileDownLoad() {

HttpServletResponse response = null;

OutputStream os=null;

try{

response = getHttpServletResponse();

os=response.getOutputStream();

response.setHeader( "Content-Disposition", "attachment;filename=" + new String("testExport.xls".getBytes(),"UTF-8"));

response.setContentType("application/msexcel");

/* write some data

.........................................

} catch(Exception e) {

log.error("export exception", e);

}

But I got the exception like this,

ERROR RestfulRequestProcessor - Error in "/dataexport/publicroomexport": java.lang.IllegalStateException: Committed

java.lang.IllegalStateException: Committed

at org.mortbay.jetty.Response.resetBuffer(Response.java:1023)

at javax.servlet.ServletResponseWrapper.resetBuffer(ServletResponseWrapper.java:202)

at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:211)

at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)

at com.scooterframework.web.controller.ActionControl.doForward(ActionControl.java:1414)

at com.scooterframework.web.controller.BaseRequestProcessor.doForward(BaseRequestProcessor.java:734)

at com.scooterframework.web.controller.BaseRequestProcessor.processNullResult(BaseRequestProcessor.java:561)

at com.scooterframework.web.controller.BaseRequestProcessor.process(BaseRequestProcessor.java:115)

at com.scooterframework.web.controller.MainActionServlet.process(MainActionServlet.java:199)

at com.scooterframework.web.controller.MainActionServlet.service(MainActionServlet.java:168)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)

at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)

at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1221)

at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:119)

at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:55)

at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)

at com.scooterframework.web.controller.ScooterRequestFilter.doFilter(ScooterRequestFilter.java:138)

at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)

at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)

at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)

at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)

at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)

at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)

at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)

at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)

at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)

at org.mortbay.jetty.Server.handle(Server.java:322)

at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)

at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)

at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)

at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)

at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)

at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)

at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

12/10/31 00:48:28,945 ERROR ScooterRequestFilter - Error from chain.doFilter: Committed