十三周作业

1.第十二周上机作业（邮件功能）的控制层代码改用为servlet实现。

 

登录的：

package com.nn.servlet;

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

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 com.nn.Dao.usersDao;

public class Login extends HttpServlet {

    /**
     * Constructor of the object.
     */
    public Login() {
        super();
    }

    /**
     * Destruction of the servlet. <br>
     */
    public void destroy() {
        super.destroy(); // Just puts "destroy" string in log
        // Put your code here
    }

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doPost(request, response);
    }

    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        HttpSession session=request.getSession();
        String uname = request.getParameter("uname");
        String upwd =request.getParameter("upwd");
        

        usersDao usersDao=new usersDao();
        try {
            if(usersDao.login(uname, upwd)){
                session.setAttribute("uname", uname);
                request.getRequestDispatcher("zhuye.jsp").forward(request, response);
            }
            else{
                
                response.setHeader("refresh", "5;url=login.jsp");
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    /**
     * Initialization of the servlet. <br>
     *
     * @throws ServletException if an error occurs
     */
    public void init() throws ServletException {
        // Put your code here
    }

}

注册的：

package com.nn.servlet;

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

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

import com.nn.Dao.usersDao;

public class Reg extends HttpServlet {

    /**
     * Constructor of the object.
     */
    public Reg() {
        super();
    }

    /**
     * Destruction of the servlet. <br>
     */
    public void destroy() {
        super.destroy(); // Just puts "destroy" string in log
        // Put your code here
    }

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doPost(request, response);
    }

    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
            request.setCharacterEncoding("utf-8");
            response.setCharacterEncoding("utf-8");
            String uid=request.getParameter("id");
            Integer id=Integer.parseInt(uid);
            String uname=request.getParameter("uname");
            String upwd =request.getParameter("upwd");
            String upwd2 =request.getParameter("upwd2");
            usersDao usersDao=new usersDao();
            if(upwd.equals(upwd2)){
                try {
                    if(usersDao.id(id)){
                        out.print("已经有这个id了，即将跳回注册页.....");
                    response.setHeader("refresh", "5;url=zhuce.jsp");
                    }
                    else{
                        usersDao.zhuce(id, uname, upwd);
                        out.print("注册成功，即将跳回登录页.....");
                    response.setHeader("refresh", "5;url=login.jsp");
}
                } catch (SQLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            else{
            out.print("两次密码不一致，即将跳回注册页.....");
            response.setHeader("refresh", "5;url=zhuce.jsp");
}
        out.close();
    }

    /**
     * Initialization of the servlet. <br>
     *
     * @throws ServletException if an error occurs
     */
    public void init() throws ServletException {
        // Put your code here
    }

}

 

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