项目实例：https://download.csdn.net/download/qq_37437983/10484636

实现环境：

1)Lenovo G50-80 Ubuntu16.04笔记本

2)Android Studio

3)Eclipse J2EE

4)Tomcat 8.5

5)sqlServer

6)jdk1.8

概要设计

基于Android平台的MP3在线播放器的设计与实现的目标为:

(l)采用布局和组件绘制系统界面。

(2)完成系统中登录界面和播放界面之间的跳转。

(3)实现界面上端的歌曲信息展示。

(4)实现在线播放功能。

(4)实现歌曲的上一首和下一首切换。

数据库表设计

(1) 用户表Userlogin，管理员信息表用于存放管理员的相关信息，结构如表1所示。

(2) 题目表Mp3Info，题目表用于存放用户答错的题目，结构如表2所示。

登录模块

运行在线Mp3播放系统，首先进入系统的登录界面。如图所示：

图8 登陆界面

　　登陆时需要判断用户名和密码是否正确，首先Android端提出登录请求并将请求帐号和密码通过Get形式传送出去，代码如下：

public class UserLogin extends AsyncTask<Void,Void,String> {private String account;private String password;UserLogin(String account,String password){this.account = account;this.password = password;}@Overrideprotected String doInBackground(Void... voids) {String PATH = "http://192.168.43.102:8080/Mp3Manager/login?account="+account+"&password="+password;String result = "";try {HttpGet get = new HttpGet(new URI(PATH));HttpClient client = new DefaultHttpClient();HttpResponse response = client.execute(get);if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {result = EntityUtils.toString(response.getEntity());Log.v("+++++++++++++++++++", result);}else {Log.v("-------------------", result);}} catch (Exception e) {e.printStackTrace();}return result;}protected void onPostExecute(String result){if(result.equals("yes")){Intent intent = new Intent(mactivity,PlayArea.class);mactivity.startActivity(intent);//    Toast.makeText(mactivity, "登录成功", Toast.LENGTH_SHORT).show();}else{Toast.makeText(mactivity, "登录失败,请输入正确的帐号和密码", Toast.LENGTH_SHORT).show();}}
}

JavaEE后台收到请求后，通过web.xml筛选后执行UserLogin.java文件,代码如下：

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubString account = request.getParameter("account");String password = request.getParameter("password");String sql = "select password from UserCollection where account = '"+account+"'";DBOper db = new DBOper();ResultSet rs = db.exeQuery(sql);try {if(rs.next()&&rs.getString(1).equals(password)) {response.getWriter().append("yes");// System.out.println("yes");}else {response.getWriter().append("no");// System.out.println("no");}} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}

图9，用户名后台

5.2 播放音乐模块

登录成功之后进入主界面，如图所示：

图10 主界面

此界面分为两部分，上面的部分是歌曲列表，可以根据歌曲多少自适应调整高度，并且点击之后会显示出歌曲的详细信息；下面部分是播放模块，可进行音乐的播放和暂停，并且还可进行上一曲和下一曲的音乐切换．Android端实现的代码如下：

public class myAsyncTask extends AsyncTask<Void, Void, String> {/*** 用于异步下载数据*/@Overrideprotected String doInBackground(Void... arg0) {// TODO Auto-generated method stubString result = "";String PATH = "http://192.168.43.102:8080/Mp3Manager/getMp3Info?";try {HttpGet get = new HttpGet(new URI(PATH));HttpClient client = new DefaultHttpClient();HttpResponse response = client.execute(get);if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {result = EntityUtils.toString(response.getEntity());// 从后台获得的数据去掉空格result = result.trim();Log.v("++++++++++", result);}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return result;}/*** 解析result（json格式的字符串）并将之存入到lists中*/@Overrideprotected void onPostExecute(String result) {// TODO Auto-generated method stubtry {JSONArray array = new JSONObject(result).getJSONArray("MP3INFO");for (int i = 0; i < array.length(); i++) {Mp3Info mp3 = new Mp3Info();JSONObject object = array.getJSONObject(i);//    Log.v("+++++++++++++++++++++", i+"+++++++++++++++++++");String id = object.getString("id").toString();String song = object.getString("song").toString();String Zsong = object.getString("Zsong").toString();String singer = object.getString("singer").toString();String album = object.getString("album").toString();String notes = object.getString("notes").toString();mp3.setAlbum(album);mp3.setId(id);mp3.setNotes(notes);mp3.setSong(song);mp3.setZsong(Zsong);mp3.setSinger(singer);lists.add(mp3);listSong.add(Zsong);}lenMp3 = lists.size();ArrayAdapter<String> adapter = new ArrayAdapter<String>(PlayArea.this,android.R.layout.simple_list_item_1,listSong);listView.setAdapter(adapter);listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {curMp3 = i;Mp3Info mp3Info = (Mp3Info)lists.get(i);String id = mp3Info.getId().toString();final String song = mp3Info.getSong().toString();final String Zsong = mp3Info.getZsong().toString();final String singer = mp3Info.getSinger().toString();String album = mp3Info.getAlbum().toString();String notes = mp3Info.getNotes().toString();new AlertDialog.Builder(PlayArea.this).setIcon(R.drawable.title).setTitle("歌曲简介").setMessage("歌曲:  "+Zsong+"\n\nｉ ｄ:  "+id+"\n\n歌 手:  "+singer+"\n\n专 辑:  "+album+"\n\n备 注:  "+notes).setPositiveButton("播放",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {PlayMp3 playMp3 = new PlayMp3();playMp3.init(song,Zsong,singer);//    Toast.makeText(PlayArea.this, "点击播放 ", Toast.LENGTH_SHORT).show();}}).setNegativeButton("关闭",null).show();}});ivMusicPlay.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {PlayMp3 playMp3 = new PlayMp3();playMp3.init();}});ivMusicPre.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {curMp3--;if(curMp3<0) curMp3 = lenMp3-1;Mp3Info mp3Info = (Mp3Info) lists.get(curMp3);final String song = mp3Info.getSong().toString();final String Zsong = mp3Info.getZsong().toString();final String singer = mp3Info.getSinger().toString();PlayMp3 playMp3 = new PlayMp3();playMp3.init(song,Zsong,singer);}});ivMusicNext.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {curMp3++;if(curMp3>=lenMp3) curMp3 = 0;Mp3Info mp3Info = (Mp3Info) lists.get(curMp3);final String song = mp3Info.getSong().toString();final String Zsong = mp3Info.getZsong().toString();final String singer = mp3Info.getSinger().toString();PlayMp3 playMp3 = new PlayMp3();playMp3.init(song,Zsong,singer);}});} catch (Exception e) {// TODO Auto-generated catch blockLog.v("+++++++++++++++++++++", e.getMessage());e.printStackTrace();}super.onPostExecute(result);}
}

图11 点击列表显示详情信息

Android端显示的信息是后台Gson将封装好的list转换为String对象传给Android端解析．代码如下：

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stub//获取gsonGson gson = new Gson();List<Mp3Info> infos = new ArrayList<>();//获取数据库信息DBOper db = new DBOper();String sql = "select * from Mp3Info";ResultSet rs = db.exeQuery(sql);try {while(rs.next()) {Mp3Info info = new Mp3Info();String id = rs.getString(1);String song = rs.getString(2);String Zsong = rs.getString(3);String singer = rs.getString(4);String album = rs.getString(5);String notes = rs.getString(6);info.setId(id);info.setSong(song);info.setAlbum(album);info.setNotes(notes);info.setZsong(Zsong);info.setSinger(singer);infos.add(info);}//将infos转换为json格式的字符串String str = gson.toJson(infos);request.setAttribute("MP3INFO", "{\"MP3INFO\":"+str+"}");request.getRequestDispatcher("index.jsp").forward(request, response);} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}response.getWriter().append("Served at: ").append(request.getContextPath());}

图12 后台歌曲信息界面

5.3 播放器数据源获取

本系统的最关键之处就是从后台Mp3库中获取数据源交给MediaPlayer.主要想法就是定义两个Socket：远程Socket和本地Socket．其中远程Socket用于请求服务器资源，本地Socket负责监听mediaplayer请求，并将远程Socket获得数据写入mediaPlayer中进行播放．

（１）首先初始化本地Socket，代码如下：

public MediaPlayerProxy(String writeFileName, boolean writeFile) throws Exception {currPlayDegree = 0;//当前音乐播放进度proxyFail = false;//代理播放失败了cachedFileLength = 0;//已缓存的文件长度fileTotalLength = 0;//要缓存的文件总长度currMusicCachedProgress = 0;//当前的音乐缓冲值（seekbar上的缓冲值）proxyIdle = false;  //代理忙this.writeFile = writeFile;this.writeFileName = writeFileName;try {if (localServer == null || localServer.isClosed()) {//创建本地socket服务器，用来监听mediaplayer请求和给mediaplayer提供数据localServer = new ServerSocket();localServer.setReuseAddress(true);//创建IP地址为192.168.43.1，端口号为9090的本地端口地址InetSocketAddress socketAddress = new InetSocketAddress(InetAddress.getByName(LOCAL_IP_ADDRESS), local_ip_port);//本地socket绑定本地端口地址localServer.bind(socketAddress);}} catch (Exception e) {Log.e("1111111111111111+++++++",e.getMessage());try {local_ip_port--;  //端口号非空闲，自减localServer = new ServerSocket();localServer.setReuseAddress(true);//创建IP地址为192.168.43.1，端口号为9090的本地端口地址InetSocketAddress socketAddress = new InetSocketAddress(InetAddress.getByName(LOCAL_IP_ADDRESS), local_ip_port);//本地socket绑定本地端口地址localServer.bind(socketAddress);} catch (Exception e2) {Log.e("22222222222222++++++",e2.getMessage());throw new Exception();}}
}

（２）根据真实的请求音源文件地址，得到本地音源文件地址将本地音源地址通过setDataSource的方式传递给mediaplayer. 前面创建的本地socket对象监听这个地址，用于获取mediaplayer的请求数据。代码如下：

public String getLocalURLAndSetRemotSocketAddr(String url) {try {remotUrl = url;if (writeFile) {  //正在缓存的音乐地址bufferingMusicUrlList.add(remotUrl);}String localProxyUrl = "";final URI originalURI = URI.create(url);final String remoteHost = originalURI.getHost();  //服务器主机if (!TextUtils.isEmpty(remoteHost)) {  //存在主机if (originalURI.getPort() != -1) {//URL带Portnew Thread(new Runnable() {@Overridepublic void run() {//服务器的主机号和端口remoteAddress = new InetSocketAddress(remoteHost, originalURI.getPort());}}).start();//替换localProxyUrl = url.replace(remoteHost + ":" + originalURI.getPort(), LOCAL_IP_ADDRESS + ":" + local_ip_port);remoteHostAndPort = remoteHost + ":" + originalURI.getPort();} else {//URL不带Port,使用80端口if (!TextUtils.isEmpty(remoteHost)) {new Thread(new Runnable() {@Overridepublic void run() {remoteAddress = new InetSocketAddress(remoteHost, HTTP_PORT);//使用80端口}}).start();localProxyUrl = url.replace(remoteHost, LOCAL_IP_ADDRESS + ":" + local_ip_port);remoteHostAndPort = remoteHost;}}}return localProxyUrl;} catch (Exception e) {Log.e("+333333333333++++++++++",e.getMessage());return "";}
}

　　（３）本地socket监听mediaplayer,通过getInputStream方法可以获取到mediaplayer传递过来的请求信息数据，由于我们是通过本地代理地址的方式获取到的，所以我们需要根据这个本地的请求信息替换成真实的远程socket请求信息，向服务器获取真实请求数据。代码如下：

public void getTrueSocketRequestInfo(Socket localSocket) throws Exception {InputStream in_localSocket = localSocket.getInputStream();String trueSocketRequestInfoStr = "";//保存MediaPlayer的真实HTTP请求byte[] local_request = new byte[1024];while (in_localSocket.read(local_request) != -1) {String str = new String(local_request);trueSocketRequestInfoStr = trueSocketRequestInfoStr + str;if (trueSocketRequestInfoStr.contains("GET") && trueSocketRequestInfoStr.contains("\r\n\r\n")) {//把request中的本地ip改为远程iptrueSocketRequestInfoStr = trueSocketRequestInfoStr.replace(LOCAL_IP_ADDRESS + ":" + local_ip_port, remoteHostAndPort);this.trueSocketRequestInfoStr = trueSocketRequestInfoStr;//如果用户拖动了进度条，因为拖动了滚动条还有Range则表示本地歌曲还未缓存完，不再保存if (trueSocketRequestInfoStr.contains("Range")) {Log.e("+44444++++Range++++++","");writeFile = false;}break;}}
}

（４）上一步我们获取到了真实的请求数据信息，此时通过远程socket连接远程请求，代码如下：

public Socket sendRemoteRequest() throws Exception {//创建远程socket用来请求网络数据Socket remoteSocket = new Socket();remoteSocket.connect(remoteAddress, socketTimeoutTime);remoteSocket.getOutputStream().write(trueSocketRequestInfoStr.getBytes());remoteSocket.getOutputStream().flush();return remoteSocket;
}

（５）将远程socket的数据，通过本地socket写入mediaplayer进行播放

（６）最后在PlayMp3.java文件中调用,代码如下：

private void playMusic() {if(Zsong!=""&&singer!=""){tv_Name.setText(Zsong);tv_author.setText(singer);}ivMusicPlay.setImageResource(R.mipmap.music_button_pause);currentState = STATE_PLAY;* 第一次执行加载数据，之后执行暂停，开始* */if (!firstPlay && mediaPlayer.getCurrentPosition() > 0) {mediaPlayerHttpProxy = null;mediaPlayer.start();} else {try {//   Toast.makeText(playArea, Zsong+"加载"+mediaPlayer.getCurrentPosition(), Toast.LENGTH_SHORT).show();mediaPlayerHttpProxy = new MediaPlayerProxy(Zsong, false);//setProgress是文件写入本地进度，setSecondaryProgress就是文件加载进度mediaPlayerHttpProxy.setOnCaChedProgressUpdateListener(new MediaPlayerProxy.OnCaChedProgressUpdateListener() {@Overridepublic void updateCachedProgress(int progress) {sb_music.setSecondaryProgress(progress);}});//得到从服务器得到的数据源String localProxyUrl = mediaPlayerHttpProxy.getLocalURLAndSetRemotSocketAddr(TEST_URL);mediaPlayerHttpProxy.startProxy();mediaPlayer.setDataSource(localProxyUrl);mediaPlayer.prepareAsync();firstPlay = false;} catch (Exception e) {Log.e("++++++++++++++++++++",e.getMessage());}}
}

项目实例：https://download.csdn.net/download/qq_37437983/10484636

下载积分不够的，留言中有百度云下载链接。

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