1、建立服务端，用于接收上传的文件。这里使用Socket，文件可能会比较大。采用多线程编程，防止并发。
package com.socket.service; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.io.PushbackInputStream; import java.io.RandomAccessFile; import java.net.ServerSocket; import java.net.Socket; import java.text.SimpleDateFormat; import java.util.Date; import java.util.HashMap; import java.util.Map; import java.util.Properties; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import com.socket.service.util.StreamTool; public class FileServer { private ExecutorService executorService;// 线程池,实现网络多用户并发 private int port;// 监听端口 private boolean quit = false;// 退出 private ServerSocket server; private Map<Long, FileLog> datas = new HashMap<Long, FileLog>();// 存放断点数据 public FileServer(int port) { this.port = port; // 创建线程池，池中具有(cpu个数*50)条线程 executorService = Executors.newFixedThreadPool(Runtime.getRuntime() .availableProcessors() * 50); } /** * 退出 */ public void quit() { this.quit = true; try { server.close(); } catch (IOException e) { } } /** * 启动服务 * * @throws Exception */ public void start() throws Exception { server = new ServerSocket(port); while (!quit) { try { Socket socket = server.accept(); // 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 executorService.execute(new SocketTask(socket)); } catch (Exception e) { // e.printStackTrace(); } } } private final class SocketTask implements Runnable { private Socket socket = null; public SocketTask(Socket socket) { this.socket = socket; } public void run() { try { System.out.println("accepted connection " + socket.getInetAddress() + ":" + socket.getPort()); PushbackInputStream inStream = new PushbackInputStream( socket.getInputStream()); // 得到客户端发来的第一行协议数据：Content-Length=143253434;filename=xxx.3gp;sourceid= // 如果用户初次上传文件，sourceid的值为空。 String head = StreamTool.readLine(inStream); System.out.println(head); if (head != null) { // 下面从协议数据中提取各项参数值 String[] items = head.split(";"); String filelength = items[0].substring(items[0].indexOf("=") + 1); String filename = items[1].substring(items[1].indexOf("=") + 1); String sourceid = items[2].substring(items[2].indexOf("=") + 1); long id = System.currentTimeMillis();// 生产资源id，如果需要唯一性，可以采用UUID FileLog log = null; if (sourceid != null && !"".equals(sourceid)) { id = Long.valueOf(sourceid); log = find(id);// 查找上传的文件是否存在上传记录 } File file = null; int position = 0; if (log == null) {// 如果不存在上传记录,为文件添加跟踪记录 String path = new SimpleDateFormat("yyyy/MM/dd/HH/mm").format(new Date()); File dir = new File("file/" + path); if (!dir.exists()) dir.mkdirs(); file = new File(dir, filename); if (file.exists()) {// 如果上传的文件发生重名，然后进行改名 filename = filename.substring(0,filename.indexOf(".") - 1) + dir.listFiles().length + filename.substring(filename.indexOf(".")); file = new File(dir, filename); } save(id, file); } else {// 如果存在上传记录,读取已经上传的数据长度 file = new File(log.getPath());// 从上传记录中得到文件的路径 if (file.exists()) { File logFile = new File(file.getParentFile(),file.getName() + ".log"); if (logFile.exists()) { Properties properties = new Properties(); properties.load(new FileInputStream(logFile)); position = Integer.valueOf(properties.getProperty("length"));// 读取已经上传的数据长度 } } } OutputStream outStream = socket.getOutputStream(); String response = "sourceid=" + id + ";position=" + position + " "; // 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 // sourceid由服务器端生成，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 outStream.write(response.getBytes()); RandomAccessFile fileOutStream = new RandomAccessFile(file, "rwd"); if (position == 0) fileOutStream.setLength(Integer.valueOf(filelength));// 设置文件长度 fileOutStream.seek(position);// 指定从文件的特定位置开始写入数据 byte[] buffer = new byte[1024]; int len = -1; int length = position; while ((len = inStream.read(buffer)) != -1) {// 从输入流中读取数据写入到文件中 fileOutStream.write(buffer, 0, len); length += len; Properties properties = new Properties(); properties.put("length", String.valueOf(length)); FileOutputStream logFile = new FileOutputStream( new File(file.getParentFile(), file.getName() + ".log")); properties.store(logFile, null);// 实时记录已经接收的文件长度 logFile.close(); } if (length == fileOutStream.length()) delete(id); fileOutStream.close(); inStream.close(); outStream.close(); file = null; } } catch (Exception e) { e.printStackTrace(); } finally { try { if (socket != null && !socket.isClosed()) socket.close(); } catch (IOException e) { } } } } public FileLog find(Long sourceid) { return datas.get(sourceid); } // 保存上传记录 public void save(Long id, File saveFile) { // 日后可以改成通过数据库存放 datas.put(id, new FileLog(id, saveFile.getAbsolutePath())); } // 当文件上传完毕，删除记录 public void delete(long sourceid) { if (datas.containsKey(sourceid)) datas.remove(sourceid); } private class FileLog { private Long id; private String path; public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getPath() { return path; } public void setPath(String path) { this.path = path; } public FileLog(Long id, String path) { this.id = id; this.path = path; } } }
2、通过swing编程启动服务：可以导出运行时jar文件。
package com.socket.service; import java.awt.BorderLayout; import java.awt.Frame; import java.awt.Label; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; public class ServerWindow extends Frame { /** * */ private static final long serialVersionUID = -2723969590211090349L; private FileServer s = new FileServer(7788); private Label label; public ServerWindow(String title) { super(title); label = new Label(); add(label, BorderLayout.PAGE_START); label.setText("服务器已经启动"); this.addWindowListener(new WindowListener() { public void windowOpened(WindowEvent e) { new Thread(new Runnable() { public void run() { try { s.start(); } catch (Exception e) { // e.printStackTrace(); } } }).start(); } public void windowIconified(WindowEvent e) { } public void windowDeiconified(WindowEvent e) { } public void windowDeactivated(WindowEvent e) { } public void windowClosing(WindowEvent e) { s.quit(); System.exit(0); } public void windowClosed(WindowEvent e) { } public void windowActivated(WindowEvent e) { } }); } /** * @param args */ public static void main(String[] args) { ServerWindow window = new ServerWindow("文件上传服务端"); window.setSize(300, 300); window.setVisible(true); } }
3、解析socket协议工具类：
package com.socket.service.util; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.PushbackInputStream; public class StreamTool { public static void save(File file, byte[] data) throws Exception { FileOutputStream outStream = new FileOutputStream(file); outStream.write(data); outStream.close(); } public static String readLine(PushbackInputStream in) throws IOException { char buf[] = new char[128]; int room = buf.length; int offset = 0; int c; loop: while (true) { switch (c = in.read()) { case -1: case ' ': break loop; case ' ': int c2 = in.read(); if ((c2 != ' ') && (c2 != -1)) in.unread(c2); break loop; default: if (--room < 0) { char[] lineBuffer = buf; buf = new char[offset + 128]; room = buf.length - offset - 1; System.arraycopy(lineBuffer, 0, buf, 0, offset); } buf[offset++] = (char) c; break; } } if ((c == -1) && (offset == 0)) return null; return String.copyValueOf(buf, 0, offset); } /** * 读取流 * * @param inStream * @return 字节数组 * @throws Exception */ public static byte[] readStream(InputStream inStream) throws Exception { ByteArrayOutputStream outSteam = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len = -1; while ((len = inStream.read(buffer)) != -1) { outSteam.write(buffer, 0, len); } outSteam.close(); inStream.close(); return outSteam.toByteArray(); } }
4、java客户端测试：
package com.socket.service; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.InputStream; import java.io.OutputStream; import java.io.PushbackInputStream; import java.io.RandomAccessFile; import java.net.Socket; import com.socket.service.util.StreamTool; public class SocketClient { /** * @param args */ public static void main(String[] args) { try { String filename = "1.zip"; String dir=SocketClient.class.getClassLoader().getResource(filename).getPath(); System.out.println(dir); Socket socket = new Socket("127.0.0.1", 7878); OutputStream outStream = socket.getOutputStream(); File file = new File("src/"+filename); System.out.println(file.exists()); String head = "Content-Length=" + file.length() + ";filename=" +filename + ";sourceid= "; outStream.write(head.getBytes()); PushbackInputStream inStream = new PushbackInputStream(socket.getInputStream()); String response = StreamTool.readLine(inStream); System.out.println(response); String[] items = response.split(";"); String position = items[1].substring(items[1].indexOf("=") + 1); RandomAccessFile fileOutStream = new RandomAccessFile(file, "r"); fileOutStream.seek(Integer.valueOf(position)); byte[] buffer = new byte[1024]; int len = -1; while ((len = fileOutStream.read(buffer)) != -1) { outStream.write(buffer, 0, len); } System.out.println(" finish .. "); fileOutStream.close(); outStream.close(); inStream.close(); socket.close(); } catch (Exception e) { e.printStackTrace(); } } /** * 读取流 * * @param inStream * @return 字节数组 * @throws Exception */ public static byte[] readStream(InputStream inStream) throws Exception { ByteArrayOutputStream outSteam = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len = -1; while ((len = inStream.read(buffer)) != -1) { outSteam.write(buffer, 0, len); } outSteam.close(); inStream.close(); return outSteam.toByteArray(); } }
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下面是android客户端测试
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1、activity后台代码：
package com.example.fileupclient; import java.io.File; import java.io.OutputStream; import java.io.PushbackInputStream; import java.io.RandomAccessFile; import java.net.Socket; import android.app.Activity; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.os.Message; import android.view.Menu; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.ProgressBar; import android.widget.TextView; import android.widget.Toast; import com.example.service.UploadLogService; import com.example.util.StreamTool; public class MainActivity extends Activity { private EditText filenameText; private TextView resultView; private ProgressBar uploadbar; private UploadLogService service; private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { uploadbar.setProgress(msg.getData().getInt("length")); float num = (float) uploadbar.getProgress() / (float) uploadbar.getMax(); int result = (int) (num * 100); resultView.setText(result + "%"); if (uploadbar.getProgress() == uploadbar.getMax()) { Toast.makeText(MainActivity.this, R.string.success, 1).show(); } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); service = new UploadLogService(this); filenameText = (EditText) findViewById(R.id.filename); resultView = (TextView) findViewById(R.id.result); uploadbar = (ProgressBar) findViewById(R.id.uploadbar); Button button = (Button) findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { String filename = filenameText.getText().toString(); if (Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) { File file = new File(Environment .getExternalStorageDirectory(), filename); if (file.exists()) { uploadbar.setMax((int) file.length()); uploadFile(file); } else { Toast.makeText(MainActivity.this, R.string.notexsit, Toast.LENGTH_LONG).show(); } } else { Toast.makeText(MainActivity.this, R.string.sdcarderror, Toast.LENGTH_LONG).show(); } } }); } private void uploadFile(final File file) { new Thread(new Runnable() { public void run() { try { String sourceid = service.getBindId(file); Socket socket = new Socket("192.168.8.101", 7788); OutputStream outStream = socket.getOutputStream(); String head = "Content-Length=" + file.length() + ";filename=" + file.getName() + ";sourceid=" + (sourceid != null ? sourceid : "") + " "; outStream.write(head.getBytes()); PushbackInputStream inStream = new PushbackInputStream( socket.getInputStream()); String response = StreamTool.readLine(inStream); String[] items = response.split(";"); String responseSourceid = items[0].substring(items[0] .indexOf("=") + 1); String position = items[1].substring(items[1].indexOf("=") + 1); if (sourceid == null) { // 如果是第一次上传文件，在数据库中不存在该文件所绑定的资源id service.save(responseSourceid, file); } RandomAccessFile fileOutStream = new RandomAccessFile(file, "r"); fileOutStream.seek(Integer.valueOf(position)); byte[] buffer = new byte[1024]; int len = -1; int length = Integer.valueOf(position); while ((len = fileOutStream.read(buffer)) != -1) { outStream.write(buffer, 0, len); length += len;// 累加已经上传的数据长度 Message msg = new Message(); msg.getData().putInt("length", length); handler.sendMessage(msg); } if (length == file.length()) service.delete(file); fileOutStream.close(); outStream.close(); inStream.close(); socket.close(); } catch (Exception e) { Toast.makeText(MainActivity.this, R.string.error, Toast.LENGTH_LONG).show(); } } }).start(); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); return true; } }
2、业务代码：
package com.example.service; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; public class DBOpenHelper extends SQLiteOpenHelper { public DBOpenHelper(Context context) { super(context, "itcast.db", null, 1); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL("CREATE TABLE IF NOT EXISTS uploadlog (_id integer primary key autoincrement, path varchar(20), sourceid varchar(20))"); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { } }
package com.example.service; import java.io.File; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; public class UploadLogService { private DBOpenHelper dbOpenHelper; public UploadLogService(Context context) { dbOpenHelper = new DBOpenHelper(context); } public String getBindId(File file) { SQLiteDatabase db = dbOpenHelper.getReadableDatabase(); Cursor cursor = db.rawQuery( "select sourceid from uploadlog where path=?", new String[] { file.getAbsolutePath() }); if (cursor.moveToFirst()) { return cursor.getString(0); } return null; } public void save(String sourceid, File file) { SQLiteDatabase db = dbOpenHelper.getWritableDatabase(); db.execSQL("insert into uploadlog(path,sourceid) values(?,?)", new Object[] { file.getAbsolutePath(), sourceid }); } public void delete(File file) { SQLiteDatabase db = dbOpenHelper.getWritableDatabase(); db.execSQL("delete from uploadlog where path=?", new Object[] { file.getAbsolutePath() }); } }
3、布局界面：
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/filename" /> <EditText android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="5.jpg" android:id="@+id/filename" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/button" android:id="@+id/button" /> <ProgressBar android:layout_width="fill_parent" android:layout_height="20px" style="?android:attr/progressBarStyleHorizontal" android:id="@+id/uploadbar" /> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center" android:id="@+id/result" /> </LinearLayout>