Java Web问题 出现这种情况是什么原因

Question

package servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import dao.UserOperate;
import entity.users;

public class UpdateInfo extends HttpServlet {

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    String name=request.getParameter("username");
    String password=request.getParameter("password");
    String sex=request.getParameter("sex");
    String tel=request.getParameter("tel");
    String birth=request.getParameter("birth1");
    String addr=request.getParameter("addr1");
    users user=new users();
    user.setLoginName(name);
    user.setUserPassword(password);
    user.setGender(sex);
    user.setTel(tel);
    user.setAge(birth);
    user.setAddress(addr);
    UserOperate u=new UserOperate();
    int num= u.updateuser(user);

    if(num>0){
        HttpSession session=request.getSession();
        session.setAttribute("user", user);
        request.getRequestDispatcher("index.jsp").forward(request,response);
    }
}


@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    doGet(request, response);

}

}

Answer 1

500是server端内部错误，也就是说你服务器端接收到了客户端的请求，但是在处理这个请求的过程中出现了未能处理的错误或者异常。你的错误显示的是在你进行servlet这个类中UpdateInfo()写的有问题。个人理解，你可以用debug 在你显示错误的代码段中打上段点，慢慢调试，看上面得到的结果是不是你想要的。