第十次作业

1.实现 删除 回复邮件
2.实现阅读邮件功能：在main.jsp中点击任意邮件的标题，进入到detail.jsp显示邮件详情，包括发件人，主题，内容，时间。同时需要把邮件状态修改为已读。

package com.jw.dao;

import java.sql.Connection;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import com.qmt.entity.Msg;

public class MsgDao extends basedao{    
    //插入邮件
    
    //删除邮件
    
    //修改邮件状态
    
    //按照接收者查询全部邮件
    public List<Msg> getMailByReceiver(String name){
        List<Msg> list=new ArrayList<Msg>();
        Connection conn=getConnection();
        String sql="select * from msg where sendto=?";
        PreparedStatement ps;
        ResultSet rs;
        try {
            ps = conn.prepareStatement(sql);
            ps.setString(1, name);
            rs=ps.executeQuery();
            while(rs.next()){
                Msg m=new Msg();
                m.setMsgid(rs.getInt(1));
                m.setUsername(rs.getString(2));
                m.setTitle(rs.getString(3));
                m.setMsgcontent(rs.getString(4));
                m.setState(rs.getInt(5));
                m.setSendto(rs.getString(6));
                m.setMsg_create_date(rs.getDate(7));
                list.add(m);
            }
            
            closeAll(conn, ps, rs);
            
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }        
        return list;
    }
}

　　

package com.jw.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import com.qmt.entity.Msg;



public class MsgDao extends BaseDao {
    // 1，插入邮件
    public void addMsg(Msg m) {
        Connection con = getConnection();
        String sql = "insert into msg(username,title,msgcontent,state,sendto,msg_create_date) values(?,?,?,?,?,?)";
        PreparedStatement ps = null;
        try {
            ps = con.prepareStatement(sql);
            ps.setString(1, m.getUsername());
            ps.setString(2, m.getTitle());
            ps.setString(3, m.getMsgcontent());
            ps.setInt(4, 1);
            ps.setString(5, m.getSendto());
            ps.setDate(6, new java.sql.Date(new Date().getTime()));// 系统当前时间
            ps.executeUpdate();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            closeAll(con, ps, null);
        }

    }

    // 2.删除邮件
    public void delMail(int id) {
        Connection conn = getConnection();
        String sql = "delete from msg where msgid=?";
        PreparedStatement ps = null;
        try {
            ps = conn.prepareStatement(sql);
            ps.setInt(1, id);
            ps.executeUpdate();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            closeAll(conn, ps, null);
        }

    }
     //(测试删除邮件的代码是否编写成功)
     //    public static void main(String[] args) {
     //    MsgDao md=new MsgDao();
    //    md.delMail(3);
    //}


    // 3.修改邮件状态
    public void update(int id) {
        Connection con = getConnection();
        String sql = "update  msg set state='1' where msgid=?";
        PreparedStatement ps = null;
        try {
            ps = con.prepareStatement(sql);
            ps.setInt(1, id);
            ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            closeAll(con, ps, null);
        }
    }

    // 4.按照接收者查询全部邮件
    public List<Msg> getMailByReceiver(String name) {
        List<Msg> list = new ArrayList<Msg>();
        Connection con = getConnection();
        String sql = "select * from msg where sendto=?";
        PreparedStatement ps=null;
        ResultSet rs=null;
        try {
            ps = con.prepareStatement(sql);
            ps.setString(1, name);
            rs = ps.executeQuery();
            while (rs.next()) {
                Msg m = new Msg();
                m.setMsgid(rs.getInt("msgid"));
                m.setUsername(rs.getString("username"));
                m.setTitle(rs.getString("title"));
                m.setMsgcontent(rs.getString("msgcontent"));
                m.setState(rs.getInt("state"));
                m.setSendto(rs.getString("sendto"));
                m.setMsg_create_date(rs.getDate("msg_create_date"));
                list.add(m);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }finally{
            closeAll(con, ps, rs);
        }
        return list;

    }
    //5.实现阅读邮件功能
    public Msg read(int id) {
        Connection con = getConnection();
        String sql = "select msgid,username,sendto,title,msgcontent,msg_create_date from msg where msgid=?";
        PreparedStatement ps = null;
        ResultSet rs = null;
        try {
            ps = con.prepareStatement(sql);
            ps.setInt(1, id);
            rs = ps.executeQuery();
            while (rs.next()) {
                Msg m = new Msg();
                m.setMsgid(rs.getInt("msgid"));
                m.setUsername(rs.getString("username"));
                m.setTitle(rs.getString("title"));
                m.setMsgcontent(rs.getString("msgcontent"));
                m.setSendto(rs.getString("sendto"));
                m.setMsg_create_date(rs.getDate("msg_create_date"));
                return m;
            }

        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            closeAll(con, ps, rs);
        }
        return null;
    }


}

　　

<%@page import="entity.Msg"%>
<%@page import="dao.MsgDao"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
<head>
<title>My JSP 'index.jsp' main page</title>
</head>
<body>
<%
    String uname=(String)session.getAttribute("uname");
 %>
 欢迎你 <% out.print(uname); %> <a href="write.jsp">写邮件</a>
 <table height="20px" width="100%" align="center" border="1">
       <tr>
           <td>发件人</td>
           <td>主题</td>
           <td>状态</td>
           <td>时间</td>
           <td>操作</td>
           <td>操作</td>
       </tr>
         <%
         MsgDao md=new MsgDao();
         List<Msg> list=md.getMailByReceiver(uname);   
            for(Msg m:list)
            {%>
           <tr>
               <td><%=m.getUsername() %></td>
               <td><a href="detail.jsp?reply=<%=m.getMsgid()%>"><%=m.getTitle() %></a></td>
               <td><%
               int state=m.getState();
               if(state==1){ %>
                   <img src ="image/已读消息.png" />
                   <%;
               }else{%>
                   <img src ="image/未读.png" />
                   <%;
               } 
               %></td>
               <td><%=m.getMsg_create_date() %></td>
               <td><a href="write.jsp?reply=<%=m.getUsername()%>">回复</a></td>
               <td><a href="del.jsp?id=<%=m.getMsgid()%>">删除</a></td>
           </tr>
            <%}
        %>
   </table>
</body>
</html>

　　

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<%@page import="entity.Msg"%>
<%@page import="dao.MsgDao"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
    String uname=(String)session.getAttribute("uname");
 %>
 <%
 request.setCharacterEncoding("utf-8");
 String msgid=request.getParameter("reply");
 int id=Integer.parseInt(msgid);
 %>
 <table height="20px" width="100%" align="center" border="1">
       <tr>
           <td>发件人</td>
           <td>主题</td>
           <td>内容</td>
           <td>时间</td>
       </tr>
         <%
         MsgDao md=new MsgDao();
         Msg m=md.Cha(id); 
         md.updateMsg(id);
          %>
           <tr>
               <td><%=m.getUsername() %></td>
               <td><%=m.getTitle() %></td>
               <td><%=m.getMsgcontent() %></td>
               <td><%=m.getMsg_create_date() %></td>
           </tr>
   </table>
</body>
</html>