struts通过response.getWriter()往jsp页面写入json串时，IllegalStateException异常求解！

hx405936929 2015-09-16 10:34:09
（1.错误代码如下）
2015-9-16 10:11:54 org.apache.catalina.core.StandardWrapperValve invoke

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

java.lang.IllegalStateException

	at org.apache.catalina.connector.ResponseFacade.sendError(ResponseFacade.java:407)

	at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:108)

	at org.springframework.security.context.HttpSessionContextIntegrationFilter$OnRedirectUpdateSessionResponseWrapper.sendError(HttpSessionContextIntegrationFilter.java:498)

	at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:771)

	at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:504)

	at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

	at qlight.frames.log.util.LogMdcFilter.doFilter(LogMdcFilter.java:44)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:378)

	at org.springframework.security.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:99)

	at org.springframework.security.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)

	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)

	at org.springframework.security.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)

	at org.springframework.security.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)

	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)

	at org.springframework.security.ui.SessionFixationProtectionFilter.doFilterHttp(SessionFixationProtectionFilter.java:67)

	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)

	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)

	at org.springframework.security.ui.ExceptionTranslationFilter.doFilterHttp(ExceptionTranslationFilter.java:101)

	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)

	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)

	at org.springframework.security.providers.anonymous.AnonymousProcessingFilter.doFilterHttp(AnonymousProcessingFilter.java:105)

	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)

	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)

	at org.springframework.security.wrapper.SecurityContextHolderAwareRequestFilter.doFilterHttp(SecurityContextHolderAwareRequestFilter.java:91)

	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)

	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)

	at org.springframework.security.ui.AbstractProcessingFilter.doFilterHttp(AbstractProcessingFilter.java:277)

	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)

	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)

	at org.springframework.security.ui.logout.LogoutFilter.doFilterHttp(LogoutFilter.java:89)

	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)

	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)

	at org.springframework.security.context.HttpSessionContextIntegrationFilter.doFilterHttp(HttpSessionContextIntegrationFilter.java:235)

	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)

	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)

	at org.springframework.security.concurrent.ConcurrentSessionFilter.doFilterHttp(ConcurrentSessionFilter.java:99)

	at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)

	at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)

	at org.springframework.security.util.FilterChainProxy.doFilter(FilterChainProxy.java:175)

	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236)

	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)

	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:96)

	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.Http11Processor.process(Http11Processor.java:861)

	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)

	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)

	at java.lang.Thread.run(Unknown Source)

（2.源码如下）
public String getMetaDataInfoList() {

		HttpServletResponse response = ServletActionContext.getResponse();

		List<Object> resultList = dbService.queryList(ServletActionContext.getRequest().getParameter("keyWords"), null);/*此处确定获取到了resultList数据*/

		String jsonStr = JSON.toJSONString(resultList);/*打印jsonStr也可以输出json串*/

		try {

			response.setContentType("text/html;charset=utf-8");/*contentType改成application/json也试过，无效*/

			response.setCharacterEncoding("UTF-8");

			PrintWriter pw = response.getWriter();

			pw.write(jsonStr);

			pw.flush();

			pw.close();

		} catch (IOException e) {

			e.printStackTrace();

		}

		return SUCCESS;/*改成return null也试过，后台没有报java.lang.IllegalStateException异常了，但jsp页面仍然接收不到json数据*/

	}

（3.struts.xml配置）


<package name="mdservice" extends="struts-default"><!-- 改成json-default也试过，无效 --> 

        <action name="getMetaDataInfoList" class="com.DataExchangeAction" method="getMetaDataInfoList"/>

</package>


（4.问题描述）
action中return SUCCESS时，才会报java.lang.IllegalStateException异常，页面接收不到json数据，改成return null后，不报异常了，但还是接收不到json数据，可以肯定的是确实可以在action打印出json串，为什么用response写到jsp就出不来，求解问题原因所在，谢谢！
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baidu_31006959 2015-09-16
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源码修改： private Map<String,List<Object> > dataMap; public Map<String, List<Object>> getDataMap() { return dataMap; } public String getMetaDataInfoList() { HttpServletResponse response = ServletActionContext.getResponse(); List<Object> resultList = dbService.queryList(ServletActionContext.getRequest().getParameter("keyWords"), null);/*此处确定获取到了resultList数据*/ dataMap = new HashMap<String, List<Object> >(); dataMap.put("json",resultList ); return “json”; } struts.xml修改： <package name="mdservice" extends="json-default"> <action name="getMetaDataInfoList" class="com.DataExchangeAction" method="getMetaDataInfoList"> <result type="json"> <!-- 这里指定将被Struts2序列化的属性，该属性在action中必须有对应的getter方法 --> <param name="root">dataMap</param> </result> </action> </package> 你试下能不能行。
hx405936929 2015-09-16
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引用 1 楼 baidu_31006959 的回复:
Struts2返回JSON对象的方法总结 希望对你有帮助。
试着将struts的action方法改成了void，jsp页面的ajax请求还是无法获取json数据啊！
baidu_31006959 2015-09-16
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Struts2返回JSON对象的方法总结 希望对你有帮助。
Java/JSP中使用response.getWriter().write(json.toString());或json.write(response.getW
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