[转载]Android应用开发之使用Socket进行大文件断点上传续传

在Android中 上传文件可以采用HTTP方式，也可以采用Socket方式，但是HTTP方式不能上传大文件，这里介绍一种通过Socket方式来进行断点续传的方式， 服务端会记录下文件的上传进度，当某一次上传过程意外终止后，下一次可以继续上传，这里用到的其实还是J2SE里的知识。

这个上传程序的原理是：客户端第一次上传时向服务端发送“Content-Length=35; filename=WinRAR_3.90_SC.exe;sourceid=“这种格式的字符串，服务端收到后会查找该文件是否有上传记录，如果有就返 回已经上传的位置，否则返回新生成的sourceid以及position为0，类似”sourceid=2324838389;position=0 “这样的字符串，客户端收到返回后的字符串后再从指定的位置开始上传文件。

首先是服务端代码：

SocketServer.java

  1. package com.android.socket.server;  
  2.   
  3. import java.io.File;  
  4. import java.io.FileInputStream;  
  5. import java.io.FileOutputStream;  
  6. import java.io.IOException;  
  7. import java.io.OutputStream;  
  8. import java.io.PushbackInputStream;  
  9. import java.io.RandomAccessFile;  
  10. import java.net.ServerSocket;  
  11. import java.net.Socket;  
  12. import java.text.SimpleDateFormat;  
  13. import java.util.Date;  
  14. import java.util.HashMap;  
  15. import java.util.Map;  
  16. import java.util.Properties;  
  17. import java.util.concurrent.ExecutorService;  
  18. import java.util.concurrent.Executors;  
  19.   
  20. import com.android.socket.utils.StreamTool;  
  21.   
  22. public class SocketServer {  
  23.     private ExecutorService executorService;// 线程池   
  24.     private ServerSocket ss = null;  
  25.     private int port;// 监听端口   
  26.     private boolean quit;// 是否退出   
  27.     private Map<Long, FileLog> datas = new HashMap<Long, FileLog>();// 存放断点数据，最好改为数据库存放   
  28.   
  29.     public SocketServer(int port) {  
  30.         this.port = port;  
  31.         // 初始化线程池   
  32.         executorService = Executors.newFixedThreadPool(Runtime.getRuntime()  
  33.                 .availableProcessors() * 50);  
  34.     }  
  35.   
  36.     // 启动服务   
  37.     public void start() throws Exception {  
  38.         ss = new ServerSocket(port);  
  39.         while (!quit) {  
  40.             Socket socket = ss.accept();// www.linuxidc.com接受客户端的请求   
  41.             // 为支持多用户并发访问，采用线程池管理每一个用户的连接请求   
  42.             executorService.execute(new SocketTask(socket));// 启动一个线程来处理请求   
  43.         }  
  44.     }  
  45.   
  46.     // 退出   
  47.     public void quit() {  
  48.         this.quit = true;  
  49.         try {  
  50.             ss.close();  
  51.         } catch (IOException e) {  
  52.             e.printStackTrace();  
  53.         }  
  54.     }  
  55.   
  56.     public static void main(String[] args) throws Exception {  
  57.         SocketServer server = new SocketServer(8787);  
  58.         server.start();  
  59.     }  
  60.   
  61.     private class SocketTask implements Runnable {  
  62.         private Socket socket;  
  63.   
  64.         public SocketTask(Socket socket) {  
  65.             this.socket = socket;  
  66.         }  
  67.   
  68.         @Override  
  69.         public void run() {  
  70.             try {  
  71.                 System.out.println("accepted connenction from "  
  72.                         + socket.getInetAddress() + " @ " + socket.getPort());  
  73.                 PushbackInputStream inStream = new PushbackInputStream(  
  74.                         socket.getInputStream());  
  75.                 // 得到客户端发来的第一行协议数据：Content-Length=143253434;filename=xxx.3gp;sourceid=   
  76.                 // 如果用户初次上传文件，sourceid的值为空。   
  77.                 String head = StreamTool.readLine(inStream);  
  78.                 System.out.println(head);  
  79.                 if (head != null) {  
  80.                     // 下面从协议数据中读取各种参数值   
  81.                     String[] items = head.split(";");  
  82.                     String filelength = items[0].substring(items[0].indexOf("=") + 1);  
  83.                     String filename = items[1].substring(items[1].indexOf("=") + 1);  
  84.                     String sourceid = items[2].substring(items[2].indexOf("=") + 1);  
  85.                     Long id = System.currentTimeMillis();  
  86.                     FileLog log = null;  
  87.                     if (null != sourceid && !"".equals(sourceid)) {  
  88.                         id = Long.valueOf(sourceid);  
  89.                         log = find(id);//查找上传的文件是否存在上传记录   
  90.                     }  
  91.                     File file = null;  
  92.                     int position = 0;  
  93.                     if(log==null){//如果上传的文件不存在上传记录,为文件添加跟踪记录   
  94.                         String path = new SimpleDateFormat("yyyy/MM/dd/HH/mm").format(new Date());  
  95.                         File dir = new File("file/"+ path);  
  96.                         if(!dir.exists()) dir.mkdirs();  
  97.                         file = new File(dir, filename);  
  98.                         if(file.exists()){//如果上传的文件发生重名，然后进行改名   
  99.                             filename = filename.substring(0, filename.indexOf(".")-1)+ dir.listFiles().length+ filename.substring(filename.indexOf("."));  
  100.                             file = new File(dir, filename);  
  101.                         }  
  102.                         save(id, file);  
  103.                     }else{// 如果上传的文件存在上传记录,读取上次的断点位置   
  104.                         file = new File(log.getPath());//从上传记录中得到文件的路径   
  105.                         if(file.exists()){  
  106.                             File logFile = new File(file.getParentFile(), file.getName()+".log");  
  107.                             if(logFile.exists()){  
  108.                                 Properties properties = new Properties();  
  109.                                 properties.load(new FileInputStream(logFile));  
  110.                                 position = Integer.valueOf(properties.getProperty("length"));//读取断点位置   
  111.                             }  
  112.                         }  
  113.                     }  
  114.                       
  115.                     OutputStream outStream = socket.getOutputStream();  
  116.                     String response = "sourceid="+ id+ ";position="+ position+ "\r\n";  
  117.                     //服务器收到客户端的请求信息后，给客户端返回响应信息：sourceid=1274773833264;position=0   
  118.                     //sourceid由服务生成，唯一标识上传的文件，position指示客户端从文件的什么位置开始上传   
  119.                     outStream.write(response.getBytes());  
  120.                       
  121.                     RandomAccessFile fileOutStream = new RandomAccessFile(file, "rwd");  
  122.                     if(position==0) fileOutStream.setLength(Integer.valueOf(filelength));//设置文件长度   
  123.                     fileOutStream.seek(position);//移动文件指定的位置开始写入数据   
  124.                     byte[] buffer = new byte[1024];  
  125.                     int len = -1;  
  126.                     int length = position;  
  127.                     while( (len=inStream.read(buffer)) != -1){//从输入流中读取数据写入到文件中   
  128.                         fileOutStream.write(buffer, 0, len);  
  129.                         length += len;  
  130.                         Properties properties = new Properties();  
  131.                         properties.put("length", String.valueOf(length));  
  132.                         FileOutputStream logFile = new FileOutputStream(new File(file.getParentFile(), file.getName()+".log"));  
  133.                         properties.store(logFile, null);//实时记录文件的最后保存位置   
  134.                         logFile.close();  
  135.                     }  
  136.                     if(length==fileOutStream.length()) delete(id);  
  137.                     fileOutStream.close();                    
  138.                     inStream.close();  
  139.                     outStream.close();  
  140.                     file = null;  
  141.                 }  
  142.             } catch (Exception e) {  
  143.                 e.printStackTrace();  
  144.             } finally {  
  145.                 try {  
  146.                     if(socket != null && !socket.isClosed()) socket.close();  
  147.                 } catch (IOException e) {}  
  148.             }  
  149.         }  
  150.   
  151.     }  
  152.   
  153.     public FileLog find(Long sourceid) {  
  154.         return datas.get(sourceid);  
  155.     }  
  156.   
  157.     // 保存上传记录   
  158.     public void save(Long id, File saveFile) {  
  159.         // 日后可以改成通过数据库存放   
  160.         datas.put(id, new FileLog(id, saveFile.getAbsolutePath()));  
  161.     }  
  162.   
  163.     // 当文件上传完毕，删除记录   
  164.     public void delete(long sourceid) {  
  165.         if (datas.containsKey(sourceid))  
  166.             datas.remove(sourceid);  
  167.     }  
  168.   
  169.     private class FileLog {  
  170.         private Long id;  
  171.         private String path;  
  172.           
  173.         public FileLog(Long id, String path) {  
  174.             super();  
  175.             this.id = id;  
  176.             this.path = path;  
  177.         }  
  178.   
  179.         public Long getId() {  
  180.             return id;  
  181.         }  
  182.   
  183.         public void setId(Long id) {  
  184.             this.id = id;  
  185.         }  
  186.   
  187.         public String getPath() {  
  188.             return path;  
  189.         }  
  190.   
  191.         public void setPath(String path) {  
  192.             this.path = path;  
  193.         }  
  194.   
  195.     }  
  196. }  

ServerWindow.java

  1. package com.android.socket.server;  
  2.   
  3. import java.awt.BorderLayout;  
  4. import java.awt.Frame;  
  5. import java.awt.Label;  
  6. import java.awt.event.WindowEvent;  
  7. import java.awt.event.WindowListener;  
  8.   
  9. public class ServerWindow extends Frame{  
  10.     private SocketServer server;  
  11.     private Label label;  
  12.       
  13.     public ServerWindow(String title){  
  14.         super(title);  
  15.         server = new SocketServer(8787);  
  16.         label = new Label();  
  17.         add(label, BorderLayout.PAGE_START);  
  18.         label.setText("服务器已经启动www.linuxidc.com");  
  19.         this.addWindowListener(new WindowListener() {  
  20.             @Override  
  21.             public void windowOpened(WindowEvent e) {  
  22.                 new Thread(new Runnable() {           
  23.                     @Override  
  24.                     public void run() {  
  25.                         try {  
  26.                             server.start();  
  27.                         } catch (Exception e) {  
  28.                             e.printStackTrace();  
  29.                         }  
  30.                     }  
  31.                 }).start();  
  32.             }  
  33.               
  34.             @Override  
  35.             public void windowIconified(WindowEvent e) {  
  36.             }  
  37.               
  38.             @Override  
  39.             public void windowDeiconified(WindowEvent e) {  
  40.             }  
  41.               
  42.             @Override  
  43.             public void windowDeactivated(WindowEvent e) {  
  44.             }  
  45.               
  46.             @Override  
  47.             public void windowClosing(WindowEvent e) {  
  48.                  server.quit();  
  49.                  System.exit(0);  
  50.             }  
  51.               
  52.             @Override  
  53.             public void windowClosed(WindowEvent e) {  
  54.             }  
  55.               
  56.             @Override  
  57.             public void windowActivated(WindowEvent e) {  
  58.             }  
  59.         });  
  60.     }  
  61.     /** 
  62.      * @param args 
  63.      */  
  64.     public static void main(String[] args) {  
  65.         ServerWindow window = new ServerWindow("文件上传服务端");   
  66.         window.setSize(300, 300);   
  67.         window.setVisible(true);  
  68.     }  
  69.   
  70. }  

工具类StreamTool.java

  1. package com.android.socket.utils;  
  2.   
  3. import java.io.ByteArrayOutputStream;  
  4. import java.io.File;  
  5. import java.io.FileOutputStream;  
  6. import java.io.IOException;  
  7. import java.io.InputStream;  
  8. import java.io.PushbackInputStream;  
  9.   
  10. public class StreamTool {  
  11.        
  12.      public static void save(File file, byte[] data) throws Exception {  
  13.          FileOutputStream outStream = new FileOutputStream(file);  
  14.          outStream.write(data);  
  15.          outStream.close();  
  16.      }  
  17.        
  18.      public static String readLine(PushbackInputStream in) throws IOException {  
  19.             char buf[] = new char[128];  
  20.             int room = buf.length;  
  21.             int offset = 0;  
  22.             int c;  
  23. loop:       while (true) {  
  24.                 switch (c = in.read()) {  
  25.                     case -1:  
  26.                     case '\n':  
  27.                         break loop;  
  28.                     case '\r':  
  29.                         int c2 = in.read();  
  30.                         if ((c2 != '\n') && (c2 != -1)) in.unread(c2);  
  31.                         break loop;  
  32.                     default:  
  33.                         if (--room < 0) {  
  34.                             char[] lineBuffer = buf;  
  35.                             buf = new char[offset + 128];  
  36.                             room = buf.length - offset - 1;  
  37.                             System.arraycopy(lineBuffer, 0, buf, 0, offset);  
  38.                              
  39.                         }  
  40.                         buf[offset++] = (char) c;  
  41.                         break;  
  42.                 }  
  43.             }  
  44.             if ((c == -1) && (offset == 0)) return null;  
  45.             return String.copyValueOf(buf, 0, offset);  
  46.     }  
  47.        
  48.     /** 
  49.     * 读取流 
  50.     * @param inStream 
  51.     * @return 字节数组 
  52.     * @throws Exception 
  53.     */  
  54.     public static byte[] readStream(InputStream inStream) throws Exception{  
  55.             ByteArrayOutputStream outSteam = new ByteArrayOutputStream();  
  56.             byte[] buffer = new byte[1024];  
  57.             int len = -1;  
  58.             while( (len=inStream.read(buffer)) != -1){  
  59.                 outSteam.write(buffer, 0, len);  
  60.             }  
  61.             outSteam.close();  
  62.             inStream.close();  
  63.             return outSteam.toByteArray();  
  64.     }  
  65. }  

Android客户端代码：

布局文件layout/main.xml

  1. <?xml version="1.0" encoding="utf-8"?>  
  2. <LinearLayout xmlns:Android="http://schemas.android.com/apk/res/android"  
  3.     android:orientation="vertical"  
  4.     android:layout_width="fill_parent"  
  5.     android:layout_height="fill_parent"  
  6.     >  
  7. <TextView    
  8.     android:layout_width="fill_parent"   
  9.     android:layout_height="wrap_content"   
  10.     android:text="@string/filename"  
  11.     />  
  12.       
  13.     <EditText    
  14.         android:layout_width="fill_parent"   
  15.         android:layout_height="wrap_content"   
  16.         android:text="WinRAR_3.90_SC.exe"  
  17.         android:id="@+id/filename"  
  18.         />  
  19.           
  20.     <Button    
  21.         android:layout_width="wrap_content"   
  22.         android:layout_height="wrap_content"   
  23.         android:text="@string/button"  
  24.         android:id="@+id/button"  
  25.         />  
  26.     <ProgressBar   
  27.             android:layout_width="fill_parent"   
  28.             android:layout_height="20px"  
  29.             style="?android:attr/progressBarStyleHorizontal"  
  30.             android:id="@+id/uploadbar"  
  31.             />   
  32.     <TextView    
  33.         android:layout_width="fill_parent"   
  34.         android:layout_height="wrap_content"   
  35.         android:gravity="center"  
  36.         android:id="@+id/result"  
  37.         />     
  38. </LinearLayout>  

数据文件values/strings.xml

  1. <?xml version="1.0" encoding="utf-8"?>  
  2. <resources>  
  3.     <string name="hello">Hello World, UploadActivity!</string>  
  4.     <string name="app_name">大视频文件断点上传</string>  
  5.     <string name="filename">文件名称</string>  
  6.     <string name="button">上传</string>  
  7.     <string name="sdcarderror">SDCard不存在或者写保护</string>  
  8.     <string name="success">上传完成</string>  
  9.     <string name="error">上传失败</string>  
  10.     <string name="filenotexsit">文件不存在</string>  
  11. </resources>  

AndroidManifest.xml

  1. <?xml version="1.0" encoding="utf-8"?>  
  2. <manifest xmlns:android="http://schemas.android.com/apk/res/android"  
  3.     package="com.android.upload"  
  4.     android:versionCode="1"  
  5.     android:versionName="1.0" >  
  6.   
  7.     <uses-sdk android:minSdkVersion="8" />  
  8.   
  9.     <application  
  10.         android:icon="@drawable/ic_launcher"  
  11.         android:label="@string/app_name" >  
  12.         <activity  
  13.             android:name=".UploadActivity"  
  14.             android:label="@string/app_name" >  
  15.             <intent-filter>  
  16.                 <action android:name="android.intent.action.MAIN" />  
  17.   
  18.                 <category android:name="android.intent.category.LAUNCHER" />  
  19.             </intent-filter>  
  20.         </activity>  
  21.     </application>  
  22.     <!-- 访问网络的权限 -->  
  23.     <uses-permission android:name="android.permission.INTERNET"/>  
  24.     <!-- 在SDCard中创建与删除文件权限 -->  
  25.     <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>  
  26.     <!-- 往SDCard写入数据权限 -->  
  27.     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>  
  28. </manifest>  

UploadActivity.java

  1. package com.android.upload;  
  2.   
  3. import java.io.File;  
  4. import java.io.OutputStream;  
  5. import java.io.PushbackInputStream;  
  6. import java.io.RandomAccessFile;  
  7. import java.net.Socket;  
  8.   
  9. import android.app.Activity;  
  10. import android.os.Bundle;  
  11. import android.os.Environment;  
  12. import android.os.Handler;  
  13. import android.os.Message;  
  14. import android.view.View;  
  15. import android.widget.Button;  
  16. import android.widget.EditText;  
  17. import android.widget.ProgressBar;  
  18. import android.widget.TextView;  
  19. import android.widget.Toast;  
  20.   
  21. import com.android.service.UploadLogService;  
  22. import com.android.utils.StreamTool;  
  23.   
  24. public class UploadActivity extends Activity {  
  25.     private EditText filenameText;  
  26.     private TextView resulView;  
  27.     private ProgressBar uploadbar;  
  28.     private UploadLogService logService;  
  29.     private Handler handler = new Handler(){  
  30.         @Override  
  31.         public void handleMessage(Message msg) {  
  32.             int length = msg.getData().getInt("size");  
  33.             uploadbar.setProgress(length);  
  34.             float num = (float)uploadbar.getProgress()/(float)uploadbar.getMax();  
  35.             int result = (int)(num * 100);  
  36.             resulView.setText(result+ "%");  
  37.             if(uploadbar.getProgress()==uploadbar.getMax()){  
  38.                 Toast.makeText(UploadActivity.this, R.string.success, 1).show();  
  39.             }  
  40.         }  
  41.     };  
  42.       
  43.     @Override  
  44.     public void onCreate(Bundle savedInstanceState) {  
  45.         super.onCreate(savedInstanceState);  
  46.         setContentView(R.layout.main);  
  47.           
  48.         logService = new UploadLogService(this);  
  49.         filenameText = (EditText)this.findViewById(R.id.filename);  
  50.         uploadbar = (ProgressBar) this.findViewById(R.id.uploadbar);  
  51.         resulView = (TextView)this.findViewById(R.id.result);  
  52.         Button button =(Button)this.findViewById(R.id.button);  
  53.         button.setOnClickListener(new View.OnClickListener() {  
  54.             @Override  
  55.             public void onClick(View v) {  
  56.                 String filename = filenameText.getText().toString();  
  57.                 if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){  
  58.                     File uploadFile = new File(Environment.getExternalStorageDirectory(), filename);  
  59.                     if(uploadFile.exists()){  
  60.                         uploadFile(uploadFile);  
  61.                     }else{  
  62.                         Toast.makeText(UploadActivity.this, R.string.filenotexsit, 1).show();  
  63.                     }  
  64.                 }else{  
  65.                     Toast.makeText(UploadActivity.this, R.string.sdcarderror, 1).show();  
  66.                 }  
  67.             }  
  68.         });  
  69.     }  
  70.     /** 
  71.      * 上传文件 
  72.      * @param uploadFile 
  73.      */  
  74.     private void uploadFile(final File uploadFile) {  
  75.         new Thread(new Runnable() {           
  76.             @Override  
  77.             public void run() {  
  78.                 try {  
  79.                     uploadbar.setMax((int)uploadFile.length());  
  80.                     String souceid = logService.getBindId(uploadFile);  
  81.                     String head = "Content-Length="+ uploadFile.length() + ";filename="+ uploadFile.getName() + ";sourceid="+  
  82.                         (souceid==null? "" : souceid)+"\r\n";  
  83.                     Socket socket = new Socket("192.168.1.123", 8787);  
  84.                     OutputStream outStream = socket.getOutputStream();  
  85.                     outStream.write(head.getBytes());  
  86.                       
  87.                     PushbackInputStream inStream = new PushbackInputStream(socket.getInputStream());      
  88.                     String response = StreamTool.readLine(inStream);  
  89.                     String[] items = response.split(";");  
  90.                     String responseid = items[0].substring(items[0].indexOf("=")+1);  
  91.                     String position = items[1].substring(items[1].indexOf("=")+1);  
  92.                     if(souceid==null){//代表原来没有上传过此文件，往数据库添加一条绑定记录   
  93.                         logService.save(responseid, uploadFile);  
  94.                     }  
  95.                     RandomAccessFile fileOutStream = new RandomAccessFile(uploadFile, "r");  
  96.                     fileOutStream.seek(Integer.valueOf(position));  
  97.                     byte[] buffer = new byte[1024];  
  98.                     int len = -1;  
  99.                     int length = Integer.valueOf(position);  
  100.                     while( (len = fileOutStream.read(buffer)) != -1){  
  101.                         outStream.write(buffer, 0, len);  
  102.                         length += len;  
  103.                         Message msg = new Message();  
  104.                         msg.getData().putInt("size", length);  
  105.                         handler.sendMessage(msg);  
  106.                     }  
  107.                     fileOutStream.close();  
  108.                     outStream.close();  
  109.                     inStream.close();  
  110.                     socket.close();  
  111.                     if(length==uploadFile.length()) logService.delete(uploadFile);  
  112.                 } catch (Exception e) {  
  113.                     e.printStackTrace();  
  114.                 }  
  115.             }  
  116.         }).start();  
  117.     }  
  118. }  

UploadLogService.java

  1. package com.android.service;  
  2.   
  3. import java.io.File;  
  4.   
  5. import android.content.Context;  
  6. import android.database.Cursor;  
  7. import android.database.sqlite.SQLiteDatabase;  
  8.   
  9. public class UploadLogService {  
  10.     private DBOpenHelper dbOpenHelper;  
  11.       
  12.     public UploadLogService(Context context){  
  13.         this.dbOpenHelper = new DBOpenHelper(context);  
  14.     }  
  15.       
  16.     public void save(String sourceid, File uploadFile){  
  17.         SQLiteDatabase db = dbOpenHelper.getWritableDatabase();  
  18.         db.execSQL("insert into uploadlog(uploadfilepath, sourceid) values(?,?)",  
  19.                 new Object[]{uploadFile.getAbsolutePath(),sourceid});  
  20.     }  
  21.       
  22.     public void delete(File uploadFile){  
  23.         SQLiteDatabase db = dbOpenHelper.getWritableDatabase();  
  24.         db.execSQL("delete from uploadlog where uploadfilepath=?", new Object[]{uploadFile.getAbsolutePath()});  
  25.     }  
  26.       
  27.     public String getBindId(File uploadFile){  
  28.         SQLiteDatabase db = dbOpenHelper.getReadableDatabase();  
  29.         Cursor cursor = db.rawQuery("select sourceid from uploadlog where uploadfilepath=?",   
  30.                 new String[]{uploadFile.getAbsolutePath()});  
  31.         if(cursor.moveToFirst()){  
  32.             return cursor.getString(0);  
  33.         }  
  34.         return null;  
  35.     }  
  36. }  

DBOpenHelper.java

  1. package com.android.service;  
  2.   
  3. import android.content.Context;  
  4. import android.database.sqlite.SQLiteDatabase;  
  5. import android.database.sqlite.SQLiteOpenHelper;  
  6.   
  7. public class DBOpenHelper extends SQLiteOpenHelper {  
  8.   
  9.     public DBOpenHelper(Context context) {  
  10.         super(context, "upload.db", null, 1);  
  11.     }  
  12.   
  13.     @Override  
  14.     public void onCreate(SQLiteDatabase db) {  
  15.         db.execSQL("CREATE TABLE uploadlog (_id integer primary key autoincrement, uploadfilepath varchar(100), sourceid varchar(10))");  
  16.     }  
  17.   
  18.     @Override  
  19.     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {  
  20.         db.execSQL("DROP TABLE IF EXISTS uploadlog");  
  21.         onCreate(db);         
  22.     }  
  23.   
  24. }  

StreamTool.java上面已经给出过了。

posted @ 2015-01-01 22:12  chenlinyunyi  阅读(190)  评论(0)  编辑  收藏  举报