【问题记录】getWriter() has already been called for this response

最新推荐文章于 2025-09-05 13:49:11 发布

原创最新推荐文章于 2025-09-05 13:49:11 发布 · 1.7k 阅读

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本文讲述了作者在开发过程中遇到的登录session过期后接口报500错误，通过排查发现是Shiro权限拦截框架的问题。解决方法是修改onAccessDenied方法，避免getWriter被多次调用，最终采用ServletOutputStream输出JSON响应。

最近做公司的管理系统，发现登录的session过期以后，刷新页面，很多接口页面会报500错误，getWriter() has already been called for this response

起初没有在意，以往是页面中断了请求，导致的错误，后面发现调用接口，大面积（seesion过期后）会报错，并不影响会跳登录页面，但是这个500的弹框，很不友好，也很不爽；

决心查看一番：

查看后台日志详细错误信息如下：

in context with path [/owner] threw exception
java.lang.IllegalStateException: getWriter() has already been called for this response
	at org.apache.catalina.connector.Response.getOutputStream(Response.java:546)
	at org.apache.catalina.connector.ResponseFacade.getOutputStream(ResponseFacade.java:210)
	at com.aciga.framework.logger.filter.AccessLoggerFilter.doFilterInternal(AccessLoggerFilter.java:112)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at com.aciga.framework.logger.filter.TraceIdFilter.doFilter(TraceIdFilter.java:33)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:109)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1639)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

断点调试

发现接口都没有进去，然后在报错的地方在日志组件里面：

根据报错信息猜测：

IllegalStateException: getWriter() has already been called for this response

从字面意思不难得出错误原因：HttpServletResponse中的PrintWriter已经被手动调用过了。所以当servlet执行到方法结果处理逻辑时，需要将返回值输出到writer中去，这时发现PrintWriter已经被调用过。于是servlet认为这是使用混乱的逻辑错误，于是抛出错误。

验证：由于接口都没有进去，怀疑是权限拦截框架的逻辑处理；

翻看代码发现还真是，在shiro的鉴权处理时，发现已经登录过期了，需要返回给页面，跳转登录页面信息；

 @Override
    protected boolean onAccessDenied(ServletRequest request, ServletResponse response)
            throws Exception {
        if (isLoginRequest(request, response)) {
            if (isLoginSubmission(request, response)) {
                return executeLogin(request, response);
            } else {
                return true;
            }
        } else {
            // 返回固定的JSON串
            WebUtils.toHttp(response).setContentType("application/json; charset=utf-8");
            JSONObject result = new JSONObject();
            result.put("message", "登录失效");
            result.put("code", 1000);
            WebUtils.toHttp(response).getWriter().print(result);
            return false;
        }
    }

找到地方就好办了，改写一下处理方式，使用ServletOutputStream进行返回：

@Override
    protected boolean onAccessDenied(ServletRequest request, ServletResponse response)
            throws Exception {
        if (isLoginRequest(request, response)) {
            if (isLoginSubmission(request, response)) {
                return executeLogin(request, response);
            } else {
                return true;
            }
        } else {
            // 返回固定的JSON串
            WebUtils.toHttp(response).setContentType("application/json; charset=utf-8");
            JSONObject result = new JSONObject();
            result.put("message", "登录失效");
            result.put("code", 1000);
            ServletOutputStream output = response.getOutputStream();
            output.write(result.toString().getBytes());
            output.flush();
            return false;
        }
    }

实测，完美解决，控制台不报错了，页面也能正常返回，完美！