public class LoginCheck extends HttpServlet {
/**
* Constructor of the object.
*/
public LoginCheck() {
super();
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setCharacterEncoding("UTF-8");
request.setCharacterEncoding("utf-8");
response.setContentType("text/html; charset=utf-8");
PrintWriter out = response.getWriter();
String userid = request.getParameter("userid");
String password = request.getParameter("password");
System.out.println(userid+password+"====================");
if(request.getSession().getAttribute("loginUser")!=null){
request.getRequestDispatcher("/index.html").forward(request, response);
}else{
Integer loginuserid=Integer.parseInt(userid);
Management managementlogin = null ;
ManagementService managementServicelogin = new ManagementService();
managementlogin = managementServicelogin.getoneManagementbyID(loginuserid);
if(!(managementlogin.getName() == null) ){
String Chechpwd = managementlogin.getPwd();
if(Chechpwd.equals(password)){
request.getSession().setAttribute("loginUser", managementlogin);
request.getRequestDispatcher("/index.html").forward(request, response);
}else{
request.getRequestDispatcher("/login.jsp").forward(request, response);
}
}else{
request.getRequestDispatcher("/login.jsp").forward(request, response);
}
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}
当输入正确的用户ID和密码时候，成功登录，当输入一个错误的用户id时候报错：type Exception report
message
description The server encountered an internal error that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
com.jclg.control.LoginCheck.doGet(LoginCheck.java:41)
com.jclg.control.LoginCheck.doPost(LoginCheck.java:66)
javax.servlet.http.HttpServlet.service(HttpServlet.java:643)
javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.43 logs.
