Android MediaPlayer与Http Proxy结合之提高篇

来源：互联网发布：狸窝ppt转换器 mac 编辑：程序博客网时间：2024/04/28 13:28

本文来自http://blog.csdn.net/hellogv/ ，引用必须注明出处！

基础篇实现一个简单的代理服务器与Android的MediaPlayer结合(仅支持Http Get)，可以通过代理服务器来转发MediaPlayer的Request以及传输服务器的Response，但基础篇还不能支持Seek，这次提高篇支持了Seek。代理服务器可以增强MediaPlayer对复杂的Http情况的适应，可以播放带防盗链的媒体文件，边播边存，还可以对大体积的媒体文件（如视频）进行多线程预加载，达到快速播放的效果。

本文代码运行在模拟器上，使用Microsoft Network Monitor 3.4来抓包，通过抓包可以发现seek的操作会重新连接服务器，并在Http Get请求中加入Range 字段，所以代理服务器每次监听到MediaPlayer的request都需要新建socket与远程服务器连接。

本文的代码可以到http://download.csdn.net/detail/hellogv/4332362下载，本文程序运行效果如图：

接下来贴出核心代码HttpGetProxy.java：

[java] view plaincopyprint?

public class HttpGetProxy {
final static private String TAG = "HttpGetProxy";
final static private String LOCAL_IP_ADDRESS = "127.0.0.1";
final static private int HTTP_PORT = 80;
private int local_ip_port;
private ServerSocket localServer = null;
private Socket localSocket = null;
private Socket remoteSocket = null;
private String remoteHost;
private InputStream in_remoteSocket;
private OutputStream out_remoteSocket;
private InputStream in_localSocket;
private OutputStream out_localSocket;
private SocketAddress address;
private interface OnFinishListener {
void onFinishListener();
}
/**
* 初始化代理服务器
* @param localport 代理服务器监听的端口
*/
public HttpGetProxy(int localport) {
local_ip_port=localport;
try {
localServer = new ServerSocket(localport, 1,
InetAddress.getByName(LOCAL_IP_ADDRESS));
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* 结束时，清除所有资源
*/
private OnFinishListener finishListener = new OnFinishListener() {
@Override
public void onFinishListener() {
System.out.println("..........release all..........");
Log.e(TAG, "..........release all..........");
try {
in_localSocket.close();
out_remoteSocket.close();
in_remoteSocket.close();
out_localSocket.close();
localSocket.close();
remoteSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
/**
* 把网络URL转为本地URL，127.0.0.1替换网络域名
* @param url 网络URL
* @return 本地URL
*/
public String getLocalURL(String url){
String result = null;
URI originalURI=URI.create(url);
remoteHost=originalURI.getHost();
if(originalURI.getPort()!=-1){//URL带Port
address = new InetSocketAddress(remoteHost,
originalURI.getPort());//使用默认端口
result=url.replace(remoteHost+":"+originalURI.getPort(),
LOCAL_IP_ADDRESS+":"+local_ip_port);
}
else{//URL不带Port
address = new InetSocketAddress(remoteHost,
HTTP_PORT);//使用80端口
result=url.replace(remoteHost,LOCAL_IP_ADDRESS+":"+local_ip_port);
}
return result;
}
/**
* 启动代理服务器
* @throws IOException
*/
public void startProxy() throws IOException {
new Thread() {
public void run() {
int bytes_read;
byte[] local_request = new byte[1024];
byte[] remote_reply = new byte[1024];
while (true) {
try {
//--------------------------------------
//监听MediaPlayer的请求，MediaPlayer->代理服务器
//--------------------------------------
localSocket = localServer.accept();
Log.e(TAG, "..........localSocket connected..........");
in_localSocket = localSocket.getInputStream();
out_localSocket = localSocket.getOutputStream();
Log.e(TAG, "..........init local Socket I/O..........");
String buffer = "";//保存MediaPlayer的HTTP请求
while ((bytes_read = in_localSocket.read(local_request)) != -1) {
String str = new String(local_request);
Log.e("localSocket---->", str);
buffer = buffer + str;
if (buffer.contains("GET")
&& buffer.contains("\r\n\r\n")) {
// ---把request中的本地ip改为远程ip---//
buffer = buffer.replace(LOCAL_IP_ADDRESS,remoteHost);
break;
}
}
Log.e(TAG, "..........local finish receive..........");
//--------------------------------------
//把MediaPlayer的请求发到网络服务器，代理服务器->网络服务器
//--------------------------------------
remoteSocket = new Socket();
remoteSocket.connect(address);
Log.e(TAG,"..........remote Server connected..........");
in_remoteSocket = remoteSocket.getInputStream();
out_remoteSocket = remoteSocket.getOutputStream();
out_remoteSocket.write(buffer.getBytes());//发送MediaPlayer的请求
out_remoteSocket.flush();
//------------------------------------------------------
//把网络服务器的反馈发到MediaPlayer，网络服务器->代理服务器->MediaPlayer
//------------------------------------------------------
Log.e(TAG,"..........remote start to receive..........");
while ((bytes_read = in_remoteSocket.read(remote_reply)) != -1) {
out_localSocket.write(remote_reply, 0, bytes_read);
out_localSocket.flush();
}
Log.e(TAG, "..........over..........");
finishListener.onFinishListener();//释放资源
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}.start();
}
}

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