Struts2标签库

时间：2017-08-25 20:30:28 阅读：241 评论：0 收藏：0 [点我收藏+]

标签：ext logs border sch blog erp getc dynamic size

这是个音乐播放列表

1、queryMusic.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>Music List</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  
  <body>
    <table border="1" cellpadding="0" cellspacing="0" width="700" height="300">
        <tr height="200">
            <td align="center">序号</td>
            <td align="center">歌曲名</td>
            <td align="center">歌手名</td>
            <td align="center">歌曲大小</td>
            <td align="center">试听</td>
            <td align="center">下载</td>
            <td align="center">操作</td>
        </tr>
        <s:iterator var="music" value="musicList" status="no">
        <tr>
            <td align="center">${no.count}</td>
            <td align="center">${music.musicName}</td>
            <td align="center">${music.singer}</td>
            <td align="center">${music.size}</td>
            <td align="center"><img src="image/st.png" /></td>
            <td align="center"><img src="image/xz.png" /></td>
            <td align="center"><a href="#">删除</a></td>
        </tr>
        </s:iterator>
    </table>
  </body>
</html>

2、Music.java

package com.cn.pojo;

public class Music {
    private String musicName;
    private String singer;
    private String size;
    public String getMusicName() {
        return musicName;
    }
    public void setMusicName(String musicName) {
        this.musicName = musicName;
    }
    public String getSinger() {
        return singer;
    }
    public void setSinger(String singer) {
        this.singer = singer;
    }
    public String getSize() {
        return size;
    }
    public void setSize(String size) {
        this.size = size;
    }
    
    public Music() {
        super();
    }
    public Music(String musicName, String singer, String size) {
        super();
        this.musicName = musicName;
        this.singer = singer;
        this.size = size;
    }
    
}

3、DBHelper.java

package com.cn.tools;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * 获取数据库操作的连接对象
 * 关闭数据库操作的各种资源
 * @author 晏先政
 *
 */
public class DBHelper {
    private static final String className = "com.mysql.jdbc.Driver";
    private static final String url = "jdbc:mysql://localhost:3306/tlx?characterEncoding=utf8&useSSL=true";
    private static final String uname = "root";
    private static final String upass = "211599100yxz";
    
    /**
     * 获取数据库连接对象的方法
     */
    public static Connection getConn(){
        Connection conn = null;
        try{
            Class.forName(className);
            conn = DriverManager.getConnection(url,uname, upass);
        } catch(Exception e){
            e.printStackTrace();
        }
        
        return conn;
    }
    
    /**
     * 关闭数据库连接对象
     */
    public static void closeConn(Connection conn){
        try{
            if(conn!=null){
                conn.close();
            }
        } catch(Exception e){
            e.printStackTrace();
        }
    }
    
    /**
     * 关闭数据库操作对象
     */
    public static void closeStmt(Statement stmt){
        try{
            if(stmt!=null){
                stmt.close();
            }
        } catch(Exception e){
            e.printStackTrace();
        }
    }

    /**
     * 关闭数据库操作对象
     */
    public static void closePstmt(PreparedStatement pstmt){
        try{
            if(pstmt!=null){
                pstmt.close();
            }
        } catch(Exception e){
            e.printStackTrace();
        }
    }
    
    /**
     * 关闭数据库操作对象
     */
    public static void closeRs(ResultSet rs){
        try{
            if(rs!=null){
                rs.close();
            }
        } catch(Exception e){
            e.printStackTrace();
        }
    }
}

4、MusicDao.java

package com.cn.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.servlet.jsp.jstl.sql.Result;
import javax.servlet.jsp.jstl.sql.ResultSupport;

import com.cn.pojo.Music;
import com.cn.tools.DBHelper;

public class MusicDao {
    private Connection conn = null;
    private PreparedStatement pstmt = null;
    private ResultSet rs = null;
    public void addMusic(Music music){
        try {
            conn = DBHelper.getConn();
            String sql = "insert into music_info(musicName,singer,size) values(?,?,?)";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, music.getMusicName());
            pstmt.setString(2, music.getSinger());
            pstmt.setString(3, music.getSize());
            pstmt.execute();
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            DBHelper.closePstmt(pstmt);
            DBHelper.closeConn(conn);
        }
    }
    
    public List<Music> queryMusic() {
        List<Music> musicList = new ArrayList<Music>();
//        Music music = new Music();
        try {
            conn = DBHelper.getConn();
            String sql = "select * from music_info";
            pstmt = conn.prepareStatement(sql);
            rs = pstmt.executeQuery();
            Result rst = ResultSupport.toResult(rs);
            Map[] rows = rst.getRows();
            for(Map row:rows){
                String musicName = row.get("musicName").toString();
                String singer = row.get("singer").toString();
                String size = row.get("size").toString();
                Music music = new Music(musicName,singer,size);
                musicList.add(music);
                System.out.println(musicList);
            }                
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            DBHelper.closeRs(rs);
            DBHelper.closePstmt(pstmt);
            DBHelper.closeConn(conn);
        }
        return musicList;
    }
    
    public void deleteMusic(){
        
    }

    public void updateMusic(Music music) {
        // TODO Auto-generated method stub
        
    }
}

5、MusicManagerAction.java

package com.cn.action;

import java.util.List;

import com.cn.dao.MusicDao;
import com.cn.pojo.Music;

public class MusicManagerAction {
    
    private List<Music> musicList;
    private MusicDao musicDao = new MusicDao();
    private Music music;
    
    public String queryMusic(){
        musicList = musicDao.queryMusic();
        System.out.println(musicList);
        return "queryMusic";
    }
    
    public String deleteMusic(){
        musicDao.deleteMusic();
        musicList = musicDao.queryMusic();
        return "deletemusic";
    }
    
    public String addMusic(){
        musicDao.addMusic(music);
        return "addMusic";
    }
    
    public String updateMusic(){
        musicDao.updateMusic(music);
        return "updatemusic";
    }
    
    public List<Music> getMusicList() {
        return musicList;
    }

    public void setMusicList(List<Music> musicList) {
        this.musicList = musicList;
    }
    
}

6、struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

    <constant name="struts.action.extension" value="do"></constant>
    <!-- 实现对动态调用的支持 -->
    <constant name="struts.enable.DynamicMethodInvocation" value="true"></constant>
    <package name="test" namespace="/" extends="struts-default">
        
        <action name="labelAction_*" class="com.cn.action.LabelAction" method="{1}">
             <result name="{1}">/{1}.jsp</result>
        </action>
        
        <action name="MusicManagerAction" class="com.cn.action.MusicManagerAction">
            <result name="queryMusic">/queryMusic.jsp</result>
            <result name="deleteMusic">/queryMusic.jsp</result>
            <result name="addMusic" type="redirectAction">
                <param name="actionName">MusicManagerAction</param>
                <param name="method">queryMusic</param>
            </result>
            <result name="updateMusic" type="redirectAction">
                <param name="actionName">MusicManagerAction</param>
                <param name="method">queryMusic</param>
            </result>
        </action>
        
        <action name="UserManagerAction_*" class="com.cn.action.UserManagerAction" method="{1}">
             <result name="{1}">/register.jsp</result>
        </action>
    </package>

</struts>

Struts2标签库

标签：ext logs border sch blog erp getc dynamic size

原文地址：http://www.cnblogs.com/Vito-Yan/p/7429497.html

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