at java.lang.Integer.parseInt(Integer.java:542)
at java.lang.Integer.valueOf(Integer.java:766)
at www.pengzheng.web.LoginServlet.service(LoginServlet.java:33)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1521)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1478)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
代码： request.setCharacterEncoding("Utf-8");
response.setContentType("text/html;charset=utf-8");
PrintWriter out=response.getWriter();
Integer empno=Integer.valueOf(request.getParameter("name"));
out.println(empno);
EmpDao dao=new EmpDaoImpl();
Emp emp=dao.queryEmpByNo(empno.intValue());
if(empno.toString()==""||empno==null){
out.print("empno为空");
request.setAttribute("error", "用户编号不存在");
request.getRequestDispatcher("login.jsp").forward(request, response);
}
if(emp!=null){
request.setAttribute("empno", empno);
response.sendRedirect("ok.jsp");
jsp代码：
<form method="get" action="login">
<input type="text" name="empname" /><span>${error!=null?error:""}</span><br/>
<input type="submit" value="登录"/>
</form>
