第十三周作业

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。 
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.MsgDao;
@WebServlet("/delete")
public class delete extends HttpServlet {
    private static final long serialVersionUID = 1L;
    public dodelete() {
        super();
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        int id=Integer.parseInt(request.getParameter("id"));
        MsgDao md=new MsgDao();
        md.delMail(id);
        response.sendRedirect("main.jsp");
    }

}

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.UsersDao;
@WebServlet("/doreg")
public class doreg extends HttpServlet {
    private static final long serialVersionUID = 1L;
    public doreg() {
        super();
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String uname = request.getParameter("uname");
        String upwd = request.getParameter("upwd");
        UsersDao ud=new UsersDao();
        ud.reg(uname, upwd);
        request.getRequestDispatcher("login.jsp").forward(request, response);
    }

}

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import dao.UsersDao;

/**
 * Servlet implementation class dologin
 */
@WebServlet("/login")
public class login extends HttpServlet {
    private static final long serialVersionUID = 1L;
    public login() {
        super();
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        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{
            response.getWriter().print("登陆失败，即将跳回登陆页.....");
            response.setHeader("refresh", "5;url=login.jsp");
        }
    }

}

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import Dao.MsgDao;
import Entity.Msg;

@WebServlet("/dowrite")
public class dowrite extends HttpServlet {
    private static final long serialVersionUID = 1L;
    public dowrite() {
        super();
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        String uname=(String)request.getSession().getAttribute("uname");
        String addressee=request.getParameter("addressee");
        String title=request.getParameter("title");
        String content=request.getParameter("content");
        Msg m=new Msg();
        m.setContent(content);
        m.setSender(uname);
        m.setAddressee(addressee);
        m.setTitle(title);
        MsgDao md=new MsgDao();
        md.addMsg(m);
        response.getWriter().print("发送成功.....");
        response.setHeader("refresh", "5;url=main.jsp");
    }

}