JSP十三周

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。

package com.ym.servlet;

import java.io.IOException;
import java.io.PrintWriter;

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

import com.ym.dao.UsersDao;

public class Dologinservlet extends HttpServlet {

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

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

    
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        request.setCharacterEncoding("utf-8");
        String uname = request.getParameter("uname");
        String upwd = request.getParameter("upwd");
        UsersDao ud = new UsersDao();
        if (ud.login(uname, upwd)) {
            request.getSession().setAttribute("uname",uname);
            request.getRequestDispatcher("main.jsp").forward(
                    request,response);
        } else {
            out.print("登录失败，即将跳回登录页......");
            response.setHeader("refresh", "3;url=denglu.jsp");
        }
    }

    
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doGet(request,response); 
    }

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

}

package com.ym.servlet;

import java.io.IOException;
import java.io.PrintWriter;

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

import com.ym.dao.MsgDao;
import com.ym.entity.Msg;

public class Dowriteservlet extends HttpServlet {

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

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

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        request.setCharacterEncoding("utf-8");
        String uname = (String) request.getSession().getAttribute("uname");
        String sendto = request.getParameter("receiver");
        String title = request.getParameter("title");
        String content = request.getParameter("content");

        Msg m = new Msg();
        m.setMsgcontent(content);
        m.setUsername(uname);
        m.setSendto(sendto);
        m.setTitle(title);

        MsgDao md = new MsgDao();
        md.addMsg(m);

        out.print("发送成功.....");
        response.setHeader("refresh", "3;url=main.jsp");
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doGet(request,response);     }

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

}

package com.ym.servlet;

import java.io.IOException;
import java.io.PrintWriter;

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

import com.ym.dao.MsgDao;
import com.ym.dao.UsersDao;

public class Doregservlet extends HttpServlet {

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

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

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        request.setCharacterEncoding("utf-8");
        String uname = request.getParameter("uname");
        String upwd = request.getParameter("upwd");

        UsersDao ud = new UsersDao();
        MsgDao md = new MsgDao();
        if (ud.register(uname, upwd) > 0) {
            request.getSession().setAttribute("uname", uname);
            request.getRequestDispatcher("denglu.jsp").forward(request,
                    response);
        } else {
            out.print("注册失败，请重新注册.......");
            response.setHeader("refresh", "3;url=reg.jsp");
        }
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doGet(request,response); 
    }

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

}

 

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