PC客户端与Android服务端的Socket同步通信（USB）

需求：

1.一个android端的service后台运行的程序，作为socket的服务器端;用于接收Pc client端发来的命令，来处理数据后，把结果发给PC client

2.PC端程序，作为socket的客户端，用于给android手机端发操作命令

难点分析：

1.手机一定要有adb模式，即插上USB线时马上提示的对话框选adb。好多对手机的操作都可以用adb直接作。

不过，我发现LG GW880就没有，要去下载个

2.android默认手机端的IP为“127.0.0.1”

3.要想联通PC与android手机的sokcet，一定要用adb forward 来作下端口转发才能连上socket.

Runtime.getRuntime().exec("adb forward tcp:12580 tcp:10086");
			Thread.sleep(3000);

4.android端的service程序Install到手机上容易，但是还要有方法来从PC的client端来启动手机上的service ，这个办法可以通过PC端adb命令来发一个Broastcast，手机端再写个接收BroastcastReceive来接收这个Broastcast，在这个BroastcastReceive来启动service

pc端命令：

Runtime.getRuntime().exec(
"adb shell am broadcast -a NotifyServiceStart");

android端的代码:ServiceBroadcastReceiver.java

package com.otheri.service;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

public class ServiceBroadcastReceiver extends BroadcastReceiver {
	private static String START_ACTION = "NotifyServiceStart";
	private static String STOP_ACTION = "NotifyServiceStop";

	@Override
	public void onReceive(Context context, Intent intent) {
		Log.d(androidService.TAG, Thread.currentThread().getName() + "---->"
				+ "ServiceBroadcastReceiver onReceive");

		String action = intent.getAction();
		if (START_ACTION.equalsIgnoreCase(action)) {
			context.startService(new Intent(context, androidService.class));

			Log.d(androidService.TAG, Thread.currentThread().getName() + "---->"
					+ "ServiceBroadcastReceiver onReceive start end");
		} else if (STOP_ACTION.equalsIgnoreCase(action)) {
			context.stopService(new Intent(context, androidService.class));
			Log.d(androidService.TAG, Thread.currentThread().getName() + "---->"
					+ "ServiceBroadcastReceiver onReceive stop end");
		}
	}

}

5.由于是USB连接，所以socket就可以设计为一但连接就一直联通，即在new socket和开完out,in流后，就用个while(true){}来循环PC端和android端的读和写

android的代码：

public void run() {
		Log.d(androidService.TAG, Thread.currentThread().getName() + "---->"
				+ "a client has connected to server!");
		BufferedOutputStream out;
		BufferedInputStream in;
		try {
			/* PC端发来的数据msg */
			String currCMD = "";
			out = new BufferedOutputStream(client.getOutputStream());
			in = new BufferedInputStream(client.getInputStream());
			// testSocket();// 测试socket方法
			androidService.ioThreadFlag = true;
			while (androidService.ioThreadFlag) {
				try {
					if (!client.isConnected()) {
						break;
					}

					/* 接收PC发来的数据 */
					Log.v(androidService.TAG, Thread.currentThread().getName()
							+ "---->" + "will read......");
					/* 读操作命令 */
					currCMD = readCMDFromSocket(in);
					Log.v(androidService.TAG, Thread.currentThread().getName()
							+ "---->" + "**currCMD ==== " + currCMD);

					/* 根据命令分别处理数据 */
					if (currCMD.equals("1")) {
						out.write("OK".getBytes());
						out.flush();
					} else if (currCMD.equals("2")) {
						out.write("OK".getBytes());
						out.flush();
					} else if (currCMD.equals("3")) {
						out.write("OK".getBytes());
						out.flush();
					} else if (currCMD.equals("4")) {
						/* 准备接收文件数据 */
						try {
							out.write("service receive OK".getBytes());
							out.flush();
						} catch (IOException e) {
							e.printStackTrace();
						}

						/* 接收文件数据，4字节文件长度，4字节文件格式，其后是文件数据 */
						byte[] filelength = new byte[4];
						byte[] fileformat = new byte[4];
						byte[] filebytes = null;

						/* 从socket流中读取完整文件数据 */
						filebytes = receiveFileFromSocket(in, out, filelength,
								fileformat);

						// Log.v(Service139.TAG, "receive data =" + new
						// String(filebytes));
						try {
							/* 生成文件 */
							File file = FileHelper.newFile("R0013340.JPG");
							FileHelper.writeFile(file, filebytes, 0,
									filebytes.length);
						} catch (IOException e) {
							e.printStackTrace();
						}
					} else if (currCMD.equals("exit")) {

					}
				} catch (Exception e) {
					// try {
					// out.write("error".getBytes("utf-8"));
					// out.flush();
					// } catch (IOException e1) {
					// e1.printStackTrace();
					// }
					Log.e(androidService.TAG, Thread.currentThread().getName()
							+ "---->" + "read write error111111");
				}
			}
			out.close();
			in.close();
		} catch (Exception e) {
			Log.e(androidService.TAG, Thread.currentThread().getName()
					+ "---->" + "read write error222222");
			e.printStackTrace();
		} finally {
			try {
				if (client != null) {
					Log.v(androidService.TAG, Thread.currentThread().getName()
							+ "---->" + "client.close()");
					client.close();
				}
			} catch (IOException e) {
				Log.e(androidService.TAG, Thread.currentThread().getName()
						+ "---->" + "read write error333333");
				e.printStackTrace();
			}
		}

6.如果是在PC端和android端的读写操作来while(true){}循环，这样socket流的结尾不好判断，不能用“-1”来判断，因为“-1”是只有在socket关闭时才作为判断结尾。

7.socket在out.write(bytes);时，要是数据太大时，超过socket的缓存，socket自动分包发送，所以对方就一定要用循环来多次读。最好的办法就是服务器和客户端协议好，比如发文件时，先写过来一个要发送的文件的大小，然后再发送文件;对方用这个大小，来循环读取数据。

android端接收数据的代码:

/**
	 * 功能：从socket流中读取完整文件数据
	 * 
	 * InputStream in：socket输入流
	 * 
	 * byte[] filelength: 流的前4个字节存储要转送的文件的字节数
	 * 
	 * byte[] fileformat：流的前5-8字节存储要转送的文件的格式（如.apk）
	 * 
	 * */
	public static byte[] receiveFileFromSocket(InputStream in,
			OutputStream out, byte[] filelength, byte[] fileformat) {
		byte[] filebytes = null;// 文件数据
		try {
			int filelen = MyUtil.bytesToInt(filelength);// 文件长度从4字节byte[]转成Int
			String strtmp = "read file length ok:" + filelen;
			out.write(strtmp.getBytes("utf-8"));
			out.flush();

			filebytes = new byte[filelen];
			int pos = 0;
			int rcvLen = 0;
			while ((rcvLen = in.read(filebytes, pos, filelen - pos)) > 0) {
				pos += rcvLen;
			}
			Log.v(androidService.TAG, Thread.currentThread().getName()
					+ "---->" + "read file OK:file size=" + filebytes.length);
			out.write("read file ok".getBytes("utf-8"));
			out.flush();
		} catch (Exception e) {
			Log.v(androidService.TAG, Thread.currentThread().getName()
					+ "---->" + "receiveFileFromSocket error");
			e.printStackTrace();
		}
		return filebytes;
	}

8.socket的最重要的机制就是读写采用的是阻塞的方式，如果客户端作为命令发起者，服务器端作为接收者的话，只有当客户端client用out.writer()写到输出流里后，即流中有数据service的read才会执行，不然就会一直停在read()那里等数据。

9.还要让服务器端可以同时连接多个client，即服务器端用new thread()来作数据读取操作。

源码：

客户端（pc端）：

testPcClient.java

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

public class testPcClient {

	/**
	 * @param args
	 * @throws InterruptedException
	 */
	public static void main(String[] args) throws InterruptedException {
		try {
			Runtime.getRuntime().exec(
					"adb shell am broadcast -a NotifyServiceStop");
			Thread.sleep(3000);
			Runtime.getRuntime().exec("adb forward tcp:12580 tcp:10086");
			Thread.sleep(3000);
			Runtime.getRuntime().exec(
					"adb shell am broadcast -a NotifyServiceStart");
			Thread.sleep(3000);
		} catch (IOException e3) {
			e3.printStackTrace();
		}

		Socket socket = null;
		try {
			InetAddress serverAddr = null;
			serverAddr = InetAddress.getByName("127.0.0.1");
			System.out.println("TCP 1111" + "C: Connecting...");
			socket = new Socket(serverAddr, 12580);
			String str = "hi,wufenglong";
			System.out.println("TCP 221122" + "C:RECEIVE");
			BufferedOutputStream out = new BufferedOutputStream(socket
					.getOutputStream());
			BufferedInputStream in = new BufferedInputStream(socket
					.getInputStream());
			BufferedReader br = new BufferedReader(new InputStreamReader(
					System.in));
			boolean flag = true;
			while (flag) {
				System.out.print("请输入1~6的数字,退出输入exit：");
				String strWord = br.readLine();// 从控制台输入1~6
				if (strWord.equals("1")) {
					out.write("1".getBytes());
					out.flush();
					System.out.println("1 finish sending the data");
					String strFormsocket = readFromSocket(in);
					System.out.println("the data sent by server is:\r\n"
							+ strFormsocket);
					System.out
							.println("=============================================");
				} else if (strWord.equals("2")) {
					out.write("2".getBytes());
					out.flush();
					System.out.println("2 finish sending the data");
					String strFormsocket = readFromSocket(in);
					System.out.println("the data sent by server is:\r\n"
							+ strFormsocket);
					System.out
							.println("=============================================");
				} else if (strWord.equals("3")) {
					out.write("3".getBytes());
					out.flush();
					System.out.println("3 finish sending the data");
					String strFormsocket = readFromSocket(in);
					System.out.println("the data sent by server is:\r\n"
							+ strFormsocket);
					System.out
							.println("=============================================");
				} else if (strWord.equals("4")) {
					/* 发送命令 */
					out.write("4".getBytes());
					out.flush();
					System.out.println("send file finish sending the CMD：");
					/* 服务器反馈：准备接收 */
					String strFormsocket = readFromSocket(in);
					System.out
							.println("service ready receice data:UPDATE_CONTACTS:"
									+ strFormsocket);
					byte[] filebytes = FileHelper.readFile("R0013340.JPG");
					System.out.println("file size=" + filebytes.length);
					/* 将整数转成4字节byte数组 */
					byte[] filelength = new byte[4];
					filelength = tools.intToByte(filebytes.length);
					/* 将.apk字符串转成4字节byte数组 */
					byte[] fileformat = null;
					fileformat = ".apk".getBytes();
					System.out
							.println("fileformat length=" + fileformat.length);
					/* 字节流中前4字节为文件长度，4字节文件格式，以后是文件流 */
					/* 注意如果write里的byte[]超过socket的缓存，系统自动分包写过去，所以对方要循环写完 */
					out.write(filelength);
					out.flush();
					String strok1 = readFromSocket(in);
					System.out.println("service receive filelength :" + strok1);
					// out.write(fileformat);
					// out.flush();
					// String strok2 = readFromSocket(in);
					// System.out.println("service receive fileformat :" +
					// strok2);
					System.out.println("write data to android");
					out.write(filebytes);
					out.flush();
					System.out.println("*********");

					/* 服务器反馈：接收成功 */
					String strread = readFromSocket(in);
					System.out.println(" send data success:" + strread);
					System.out
							.println("=============================================");
				} else if (strWord.equalsIgnoreCase("EXIT")) {
					out.write("EXIT".getBytes());
					out.flush();
					System.out.println("EXIT finish sending the data");
					String strFormsocket = readFromSocket(in);
					System.out.println("the data sent by server is:\r\n"
							+ strFormsocket);
					flag = false;
					System.out
							.println("=============================================");
				}
			}

		} catch (UnknownHostException e1) {
			System.out.println("TCP 331133" + "ERROR:" + e1.toString());
		} catch (Exception e2) {
			System.out.println("TCP 441144" + "ERROR:" + e2.toString());
		} finally {
			try {
				if (socket != null) {
					socket.close();
					System.out.println("socket.close()");
				}
			} catch (IOException e) {
				System.out.println("TCP 5555" + "ERROR:" + e.toString());
			}
		}
	}

	/* 从InputStream流中读数据 */
	public static String readFromSocket(InputStream in) {
		int MAX_BUFFER_BYTES = 4000;
		String msg = "";
		byte[] tempbuffer = new byte[MAX_BUFFER_BYTES];
		try {
			int numReadedBytes = in.read(tempbuffer, 0, tempbuffer.length);
			msg = new String(tempbuffer, 0, numReadedBytes, "utf-8");

			tempbuffer = null;
		} catch (Exception e) {
			e.printStackTrace();
		}
		// Log.v(Service139.TAG, "msg=" + msg);
		return msg;
	}
}

android服务器端：

主类androidService.java

package com.otheri.service;

import java.io.File;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.util.Log;

/**
 * 设置：android手机
 * 
 * 
 * */
public class androidService extends Service {
	public static final String TAG = "TAG";
	public static Boolean mainThreadFlag = true;
	public static Boolean ioThreadFlag = true;
	ServerSocket serverSocket = null;
	final int SERVER_PORT = 10086;
	File testFile;
	private sysBroadcastReceiver sysBR;

	@Override
	public void onCreate() {
		super.onCreate();
		Log.v(TAG, Thread.currentThread().getName() + "---->" + "  onCreate");
		/* 创建内部类sysBroadcastReceiver 并注册registerReceiver */
		sysRegisterReceiver();
		new Thread() {
			public void run() {
				doListen();
			};
		}.start();
	}

	private void doListen() {
		Log.d(TAG, Thread.currentThread().getName() + "---->"
				+ " doListen() START");
		serverSocket = null;
		try {
			Log.d(TAG, Thread.currentThread().getName() + "---->"
					+ " doListen() new serverSocket");
			serverSocket = new ServerSocket(SERVER_PORT);

			boolean mainThreadFlag = true;
			while (mainThreadFlag) {
				Log.d(TAG, Thread.currentThread().getName() + "---->"
						+ " doListen() listen");

				Socket client = serverSocket.accept();

				new Thread(new ThreadReadWriterIOSocket(this, client)).start();
			}
		} catch (IOException e1) {
			Log.v(androidService.TAG, Thread.currentThread().getName()
					+ "---->" + "new serverSocket error");
			e1.printStackTrace();
		}
	}

	/* 创建内部类sysBroadcastReceiver 并注册registerReceiver */
	private void sysRegisterReceiver() {
		Log.v(TAG, Thread.currentThread().getName() + "---->"
				+ "sysRegisterReceiver");
		sysBR = new sysBroadcastReceiver();
		/* 注册BroadcastReceiver */
		IntentFilter filter1 = new IntentFilter();
		/* 新的应用程序被安装到了设备上的广播 */
		filter1.addAction("android.intent.action.PACKAGE_ADDED");
		filter1.addDataScheme("package");
		filter1.addAction("android.intent.action.PACKAGE_REMOVED");
		filter1.addDataScheme("package");
		registerReceiver(sysBR, filter1);
	}

	/* 内部类：BroadcastReceiver 用于接收系统事件 */
	private class sysBroadcastReceiver extends BroadcastReceiver {

		@Override
		public void onReceive(Context context, Intent intent) {
			String action = intent.getAction();
			if (action.equalsIgnoreCase("android.intent.action.PACKAGE_ADDED")) {
				// ReadInstalledAPP();
			} else if (action
					.equalsIgnoreCase("android.intent.action.PACKAGE_REMOVED")) {
				// ReadInstalledAPP();
			}
			Log.v(TAG, Thread.currentThread().getName() + "---->"
					+ "sysBroadcastReceiver onReceive");
		}
	}

	@Override
	public void onDestroy() {
		super.onDestroy();

		// 关闭线程
		mainThreadFlag = false;
		ioThreadFlag = false;
		// 关闭服务器
		try {
			Log.v(TAG, Thread.currentThread().getName() + "---->"
					+ "serverSocket.close()");
			serverSocket.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		Log.v(TAG, Thread.currentThread().getName() + "---->"
				+ "**************** onDestroy****************");
	}

	@Override
	public void onStart(Intent intent, int startId) {
		Log.d(TAG, Thread.currentThread().getName() + "---->" + " onStart()");
		super.onStart(intent, startId);

	}

	@Override
	public IBinder onBind(Intent arg0) {
		Log.d(TAG, "  onBind");
		return null;
	}

}

用于接收PC发来的Broastcast并启动主类service的ServiceBroadcastReceiver.java

package com.otheri.service;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

public class ServiceBroadcastReceiver extends BroadcastReceiver {
	private static String START_ACTION = "NotifyServiceStart";
	private static String STOP_ACTION = "NotifyServiceStop";

	@Override
	public void onReceive(Context context, Intent intent) {
		Log.d(androidService.TAG, Thread.currentThread().getName() + "---->"
				+ "ServiceBroadcastReceiver onReceive");

		String action = intent.getAction();
		if (START_ACTION.equalsIgnoreCase(action)) {
			context.startService(new Intent(context, androidService.class));

			Log.d(androidService.TAG, Thread.currentThread().getName() + "---->"
					+ "ServiceBroadcastReceiver onReceive start end");
		} else if (STOP_ACTION.equalsIgnoreCase(action)) {
			context.stopService(new Intent(context, androidService.class));
			Log.d(androidService.TAG, Thread.currentThread().getName() + "---->"
					+ "ServiceBroadcastReceiver onReceive stop end");
		}
	}

}

用于新socket连接的读写线程类ThreadReadWriterIOSocket.java

package com.otheri.service;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

import android.content.Context;
import android.util.Log;

import com.otheri.util.FileHelper;
import com.otheri.util.MyUtil;

/**
 * 功能：用于socket的交互
 * 
 * @author wufenglong
 * 
 */
public class ThreadReadWriterIOSocket implements Runnable {
	private Socket client;
	private Context context;

	ThreadReadWriterIOSocket(Context context, Socket client) {

		this.client = client;
		this.context = context;
	}

	@Override
	public void run() {
		Log.d(androidService.TAG, Thread.currentThread().getName() + "---->"
				+ "a client has connected to server!");
		BufferedOutputStream out;
		BufferedInputStream in;
		try {
			/* PC端发来的数据msg */
			String currCMD = "";
			out = new BufferedOutputStream(client.getOutputStream());
			in = new BufferedInputStream(client.getInputStream());
			// testSocket();// 测试socket方法
			androidService.ioThreadFlag = true;
			while (androidService.ioThreadFlag) {
				try {
					if (!client.isConnected()) {
						break;
					}

					/* 接收PC发来的数据 */
					Log.v(androidService.TAG, Thread.currentThread().getName()
							+ "---->" + "will read......");
					/* 读操作命令 */
					currCMD = readCMDFromSocket(in);
					Log.v(androidService.TAG, Thread.currentThread().getName()
							+ "---->" + "**currCMD ==== " + currCMD);

					/* 根据命令分别处理数据 */
					if (currCMD.equals("1")) {
						out.write("OK".getBytes());
						out.flush();
					} else if (currCMD.equals("2")) {
						out.write("OK".getBytes());
						out.flush();
					} else if (currCMD.equals("3")) {
						out.write("OK".getBytes());
						out.flush();
					} else if (currCMD.equals("4")) {
						/* 准备接收文件数据 */
						try {
							out.write("service receive OK".getBytes());
							out.flush();
						} catch (IOException e) {
							e.printStackTrace();
						}

						/* 接收文件数据，4字节文件长度，4字节文件格式，其后是文件数据 */
						byte[] filelength = new byte[4];
						byte[] fileformat = new byte[4];
						byte[] filebytes = null;

						/* 从socket流中读取完整文件数据 */
						filebytes = receiveFileFromSocket(in, out, filelength,
								fileformat);

						// Log.v(Service139.TAG, "receive data =" + new
						// String(filebytes));
						try {
							/* 生成文件 */
							File file = FileHelper.newFile("R0013340.JPG");
							FileHelper.writeFile(file, filebytes, 0,
									filebytes.length);
						} catch (IOException e) {
							e.printStackTrace();
						}
					} else if (currCMD.equals("exit")) {

					}
				} catch (Exception e) {
					// try {
					// out.write("error".getBytes("utf-8"));
					// out.flush();
					// } catch (IOException e1) {
					// e1.printStackTrace();
					// }
					Log.e(androidService.TAG, Thread.currentThread().getName()
							+ "---->" + "read write error111111");
				}
			}
			out.close();
			in.close();
		} catch (Exception e) {
			Log.e(androidService.TAG, Thread.currentThread().getName()
					+ "---->" + "read write error222222");
			e.printStackTrace();
		} finally {
			try {
				if (client != null) {
					Log.v(androidService.TAG, Thread.currentThread().getName()
							+ "---->" + "client.close()");
					client.close();
				}
			} catch (IOException e) {
				Log.e(androidService.TAG, Thread.currentThread().getName()
						+ "---->" + "read write error333333");
				e.printStackTrace();
			}
		}
	}

	/**
	 * 功能：从socket流中读取完整文件数据
	 * 
	 * InputStream in：socket输入流
	 * 
	 * byte[] filelength: 流的前4个字节存储要转送的文件的字节数
	 * 
	 * byte[] fileformat：流的前5-8字节存储要转送的文件的格式（如.apk）
	 * 
	 * */
	public static byte[] receiveFileFromSocket(InputStream in,
			OutputStream out, byte[] filelength, byte[] fileformat) {
		byte[] filebytes = null;// 文件数据
		try {
			in.read(filelength);// 读文件长度
			int filelen = MyUtil.bytesToInt(filelength);// 文件长度从4字节byte[]转成Int
			String strtmp = "read file length ok:" + filelen;
			out.write(strtmp.getBytes("utf-8"));
			out.flush();

			filebytes = new byte[filelen];
			int pos = 0;
			int rcvLen = 0;
			while ((rcvLen = in.read(filebytes, pos, filelen - pos)) > 0) {
				pos += rcvLen;
			}
			Log.v(androidService.TAG, Thread.currentThread().getName()
					+ "---->" + "read file OK:file size=" + filebytes.length);
			out.write("read file ok".getBytes("utf-8"));
			out.flush();
		} catch (Exception e) {
			Log.v(androidService.TAG, Thread.currentThread().getName()
					+ "---->" + "receiveFileFromSocket error");
			e.printStackTrace();
		}
		return filebytes;
	}

	/* 读取命令 */
	public static String readCMDFromSocket(InputStream in) {
		int MAX_BUFFER_BYTES = 2048;
		String msg = "";
		byte[] tempbuffer = new byte[MAX_BUFFER_BYTES];
		try {
			int numReadedBytes = in.read(tempbuffer, 0, tempbuffer.length);
			msg = new String(tempbuffer, 0, numReadedBytes, "utf-8");
			tempbuffer = null;
		} catch (Exception e) {
			Log.v(androidService.TAG, Thread.currentThread().getName()
					+ "---->" + "readFromSocket error");
			e.printStackTrace();
		}
		// Log.v(Service139.TAG, "msg=" + msg);
		return msg;
	}
}

后面是两个辅助类：

package com.otheri.util;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import com.otheri.service.androidService;

import android.util.Log;

public class FileHelper {
	// private static String FILEPATH = "/data/local/tmp";

	private static String FILEPATH = "/sdcard";

	// private static String FILEPATH = "/tmp";

	public static File newFile(String fileName) {
		File file = null;
		try {
			file = new File(FILEPATH, fileName);
			file.delete();
			file.createNewFile();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return file;
	}

	public static void writeFile(File file, byte[] data, int offset, int count)
			throws IOException {

		FileOutputStream fos = new FileOutputStream(file, true);
		fos.write(data, offset, count);
		fos.flush();
		fos.close();
	}

	public static byte[] readFile(String fileName) throws IOException {
		File file = new File(FILEPATH, fileName);
		file.createNewFile();
		FileInputStream fis = new FileInputStream(file);
		BufferedInputStream bis = new BufferedInputStream(fis);
		int leng = bis.available();
		Log.v(androidService.TAG, "filesize = " + leng);
		byte[] b = new byte[leng];
		bis.read(b, 0, leng);
		// Input in = new Input(fis);
		// byte[] ret = in.readAll();
		// in.close();
		bis.close();
		return b;

	}
}

package com.otheri.util;

import java.io.InputStream;

import android.util.Log;

import com.otheri.service.androidService;

public class MyUtil {
	/* byte[]转Int */
	public static int bytesToInt(byte[] bytes) {
		int addr = bytes[0] & 0xFF;
		addr |= ((bytes[1] << 8) & 0xFF00);
		addr |= ((bytes[2] << 16) & 0xFF0000);
		addr |= ((bytes[3] << 24) & 0xFF000000);
		return addr;
	}

	/* Int转byte[] */
	public static byte[] intToByte(int i) {
		byte[] abyte0 = new byte[4];
		abyte0[0] = (byte) (0xff & i);
		abyte0[1] = (byte) ((0xff00 & i) >> 8);
		abyte0[2] = (byte) ((0xff0000 & i) >> 16);
		abyte0[3] = (byte) ((0xff000000 & i) >> 24);
		return abyte0;
	}

	
	
	
}