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int threadCount=3; String url_st = "http://192.168.11.60:8080/mytry/FilePush?file=122.PNG"; String file_path = "D:/zhang.png"; //连接网络，获得文件大小。 URL url = new URL(url_st); HttpURLConnection http = (HttpURLConnection) url.openConnection(); http.setRequestMethod("GET"); http.setConnectTimeout(10000); int status = http.getResponseCode(); if(status == 200){ int len = http.getContentLength(); //设置存储的位置 File file = new File(file_path); RandomAccessFile raf = new RandomAccessFile(file, "rw"); //设置缓存文件大小。充大内容。 raf.setLength(len); raf.close(); int blocksize = len/threadCount; for(int i=0;i<threadCount;i++){ //按照数组的序号 int start=i*blocksize; int end = (i+1)*blocksize-1; if(i == (threadCount-1)){ end = len-1; } System.out.println("需要下载大小："+len); new Thread(new MyRunnable(url_st,file_path,start,end)).start(); } }else{ //网络错误响应 } class MyRunnable implements Runnable{ private String url_st; private String file_path; private int start; private int end; public MyRunnable(String url_st, String file_path, int start, int end) { this.url_st = url_st; this.file_path = file_path; this.start = start; this.end = end; System.out.println(">>>>>>>>>开启一个新的线程。start:"+start+" end:"+end); } @Override public void run() { try { URL url = new URL(url_st); HttpURLConnection http = (HttpURLConnection) url.openConnection(); http.setRequestMethod("GET"); http.setRequestProperty("Range", "bytes="+start+"-"+end); http.setConnectTimeout(10000); //开始写 InputStream is = http.getInputStream(); RandomAccessFile raf = new RandomAccessFile(file_path,"rwd"); raf.seek(start); byte[] buffer = new byte[1024*10]; int len =0; while((len = is.read(buffer)) != -1){ raf.write(buffer, 0, len); //标记写的位置，可以用来续传 } raf.close(); http.disconnect(); } catch (MalformedURLException e) { e.printStackTrace(); }catch(IOException e){ e.printStackTrace(); } } } // 客户端进行 Range 网络请求，或者进行接收的 skip 输入流的: skip(long bytes);//由于skip不稳定，一般不直接使用 public static void skipFully(InputStream is,long bytes) throws IOException{ long remaining = bytes; long len = 0; while(remaining > 0){ len = is.skip(remaining); remaining -= len; } }

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