解决DataInputStream read不等于-1,socket文件传输只能传输一个文件无法传输多个问题

  // 开始接收文件
                    byte[] bytes = new byte[1024];
                    //byte[] bytes = new byte[dis.available()];
                    int length = 0;
                    while((length = dis.read(bytes, 0, bytes.length)) != -1) {
                    	 System.out.println(bytes.length);
                        fos.write(bytes, 0, length);
                        fos.flush();
                        
                        
                        
                    }
                    System.out.println("======== 文件接收成功 [File Name：" + fileName + "] [Size：" + getFormatFileSize(fileLength) + "] ========");

  //dis就是DataInputStream
 String fileName = dis.readUTF();//文件名字
                    long fileLength = dis.readLong();//文件长度
                    File directory = new File(savepath);
                    if(!directory.exists()) {
                        directory.mkdir();
                    }
                    File file = new File(directory.getAbsolutePath() + File.separatorChar + fileName);
                    fos = new FileOutputStream(file);
                    // 开始接收文件
                    byte[] bytes = new byte[1024];
                    //byte[] bytes = new byte[dis.available()];
                    int length = 0;
                    while((length = dis.read(bytes, 0, bytes.length)) != -1) {
                    	 System.out.println(bytes.length);
                    	 //fos就是FileOutputStream
                        fos.write(bytes, 0, length);
                        fos.flush();

                       //*************关键的一步**************//
                        if(fileLength == file.length()) break;
                        //***************************//
                    }
                    System.out.println("======== 文件接收成功 [File Name：" + fileName + "] [Size：" + getFormatFileSize(fileLength) + "] ========");