是要看报错界面吗报错代码如下HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error that prevented it from fulfilling this request.exception java.lang.NullPointerException com.yxl.LoginCl.doGet(LoginCl.java:26) javax.servlet.http.HttpServlet.service(HttpServlet.java:621) javax.servlet.http.HttpServlet.service(HttpServlet.java:728) note The full stack trace of the root cause is available in the Apache Tomcat/7.0.47 logs. --------------------------------------------------------------------------------Apache Tomcat/7.0.47
是要看报错界面吗报错代码如下HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error that prevented it from fulfilling this request.exception java.lang.NullPointerException
com.yxl.LoginCl.doGet(LoginCl.java:26)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.47 logs.
--------------------------------------------------------------------------------Apache Tomcat/7.0.47
谢谢这个有用 我按照你说的改了 可是它就无法跳转到欢迎界面了 老是跳转到登录界面
我有三个java文件 一个是登录的 这个可以编译 还有一个是登录验证的 最后就是欢迎界面了