求解决springMVC 中出现getOutputStream() has already been called for this response的有关问题

求解决springMVC 中出现getOutputStream() has already been called for this response的问题。

@RequestMapping(value="queryMenusForManage")
public @ResponseBody Map<String, Object> queryMenusForManage(ModelAndView mav, HttpServletRequest request, HttpServletResponse response) throws Exception {
List<SysMenu> menuList = menuService.queryMenusForManage();
dealMenu(menuList);
NodeTree<SysMenu> nodeTree = new NodeTree<SysMenu>();
List<SysMenu> dataList = nodeTree.getRootNodeTreeForJqgrid(menuList);
Map<String, Object> resultMap = new HashMap<String, Object>();
resultMap.put("rows", dataList); 
return resultMap;
}

我在controller中返回 @ResponseBody到前台，通过freemarker进行展示，就报了下面这样的错误，虽然对前台页面没啥影响，但后台一直这样报错很烦的。求解决

java.lang.IllegalStateException: getOutputStream() has already been called for this response
at org.apache.catalina.connector.Response.getWriter(Response.java:611)
at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:198)
at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112)
at org.springframework.web.servlet.view.freemarker.FreeMarkerView.processTemplate(FreeMarkerView.java:366)
at org.springframework.web.servlet.view.freemarker.FreeMarkerView.doRender(FreeMarkerView.java:283)
at org.springframework.web.servlet.view.freemarker.FreeMarkerView.renderMergedTemplateModel(FreeMarkerView.java:233)
at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:167)
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1180)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:950)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
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.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:167)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
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: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:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:879)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:600)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1703)
at java.lang.Thread.run(Thread.java:662)

我找了下，

org.springframework.web.servlet.view.freemarker.FreeMarkerView.processTemplate(FreeMarkerView.java:366)

这行代码正好是调用getWriter()的，所以是和前面的冲突了。

template.process(model, response.getWriter());

[解决办法]
我也遇到一个问题，就下载视频的时候，报找不到文件异常。。可是那个地址是可以访问的，上面也确实存在那个文件。。。
[解决办法]
jsp中加下面两行试
out.clear();  
out = pageContext.pushBody();  

[解决办法]
看来是流使用了两次，或者是没有关闭
[解决办法]
接连使用getOutputStream就会报这个错（getWriter底层貌似也是使用了getOutputStream）

这里说的接连可能是指上一个获得的OutputStream没有关闭就连着用。

但仅仅从楼主给出的方法貌似看不出迹象，可能在方法内部。

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