Cannot forward after response has been committed

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Cannot forward after response has been committed 博客分类：异常

java.lang.IllegalStateException: Cannot forward after response has bee...

严重: Servlet.service() for servlet StudentLoginSvlt threw exception
java.lang.IllegalStateException: Cannot forward after response has been committed
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:312)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
at StudentLoginSvlt.doError(StudentLoginSvlt.java:109)
at StudentLoginSvlt.doEnrol(StudentLoginSvlt.java:71)
at StudentLoginSvlt.doGet(StudentLoginSvlt.java:46)
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.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:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)

这个是错误是由于response多次提交或者是由于有页面显示后仍然含请求转向产生的，

或者是多个filter的惹reponse的页面跳转

就是说程序在return之前就已经执行了跳转或者执行过response，之后遇到return的话，程序想再次执行跳转，也就是重定向，这时功能也许会实现了，但是控制台会报错，所以控制好跳转是很重要的，我现在的解决办法还是加return null，还没找到更好的解决办法，return null就不能转到另外的页面。”

还看到有这样的指点：“

它是关于跳转转发问题是由于有页面显示后仍然含有请求转向产生的。即：在请求进入action中后没有返回再次请求跳转。解决办法： 1．在request.getRequestDispatcher("how_much.jsp"). forward(request, response);后加return;

转载于:https://my.oschina.net/xiaominmin/blog/1598236

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