问题描述
在我的Java web项目中,写了一个获取验证码的方法,代码如下所示
@WebServlet("/checkCodeServlet")
public class CheckCodeServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 生成验证码
ServletOutputStream os = response.getOutputStream();
String checkCode = CheckCodeUtil.outputVerifyImage(100, 50, os, 4);
// 存入Session
HttpSession session = request.getSession();
session.setAttribute("checkCodeGen",checkCode);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
}
结果运行的时候报错如下所示:
严重: Servlet.service() for servlet [edu.aviation.web.servlet.CheckCodeServlet] in context with path [/aviation] threw exception
java.lang.IllegalStateException: Cannot create a session after the response has been committed
at org.apache.catalina.connector.Request.doGetSession(Request.java:2921)
at org.apache.catalina.connector.Request.getSession(Request.java:2318)
at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:899)
at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:911)
at edu.aviation.web.servlet.CheckCodeServlet.doGet(CheckCodeServlet.java:20)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at edu.aviation.web.filter.EncodingFilter.doFilter(EncodingFilter.java:31)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
原因分析
有时候在操作Session时,系统会抛出如下异常
java.lang.IllegalStateException: Cannot create a session after the response has been committed
之所以会出现此类问题是因为我们在Response输出响应后才创建Session的。
(因为那时候服务器已经将数据发送到客户端了,即:就无法发送Session ID 了)
解决办法:
你只需要在你的程序中将创建访问Session的语句【request.getSession()】提前至Response输出数据之前就好了。
我们将下面代码
// 存入Session
HttpSession session = request.getSession();
移动到最前面
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 存入Session
HttpSession session = request.getSession();
// 生成验证码
ServletOutputStream os = response.getOutputStream();
String checkCode = CheckCodeUtil.outputVerifyImage(100, 50, os, 4);
session.setAttribute("checkCodeGen",checkCode);
}