android 网络编程详解代码第7章（android的Socket编程）

package com.wangjialin.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; } 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+ "\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; } } }