J2SE通过TCPIP协议实现断点续传上传实现
服务器代码：
FileServer.java
package cn.itcast.net.server;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 cn.itcast.utils.StreamTool;public class FileServer { private ExecutorService executorService;//线程池 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;}@Overridepublic 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UUIDFileLog 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){//如果上传的文件不存在上传记录,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{// 如果上传的文件存在上传记录,读取上次的断点位置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"));//读取断点位置}}}OutputStream outStream = socket.getOutputStream();String response = "sourceid="+ id+ ";position="+ position+ "\r\n";//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);//移动文件指定的位置开始写入数据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);//实时记录文件的最后保存位置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;} }}ServerWindow.java
package cn.itcast.net.server;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 FileServer s = new FileServer(7878);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() {@Overridepublic void windowOpened(WindowEvent e) {new Thread(new Runnable() {@Overridepublic void run() {try {s.start();} catch (Exception e) {e.printStackTrace();}}}).start();}@Overridepublic void windowIconified(WindowEvent e) {}@Overridepublic void windowDeiconified(WindowEvent e) {}@Overridepublic void windowDeactivated(WindowEvent e) {}@Overridepublic void windowClosing(WindowEvent e) { s.quit(); System.exit(0);}@Overridepublic void windowClosed(WindowEvent e) {}@Overridepublic 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);}}
客户端代码：
SocketClient.java
package cn.itcast.net.client;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 cn.itcast.utils.StreamTool;public class SocketClient {/** * @param args */public static void main(String[] args) {try { //Socket socket = new Socket("127.0.0.1", 7878);Socket socket = new Socket("127.0.0.1", 7878); OutputStream outStream = socket.getOutputStream(); String filename = "QQWubiSetup.exe"; File file = new File(filename); String head = "Content-Length="+ file.length() + ";filename="+ filename + ";sourceid=1278916111468\r\n"; 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;int i = 0;while( (len = fileOutStream.read(buffer)) != -1){outStream.write(buffer, 0, len);i++;//if(i==10) break;}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();}}
项目源码下载：http://pan.baidu.com/share/link?shareid=267312&uk=1796216265