Java实现文件上传服务器和客户端 Java实现文件上传服务器和客户端

/** 
 * 使用TCP协议实现上传功能的服务器端 
 * 思路： 
 * 新建ServerSocket 
 * 等待客户端连接 
 * 连接上后开启子线程，把连接获取的Socket传给子线程 
 * 循环进行 
 * @author yajun 
 * 
 */ 
public class UploadServer { 
  
 public static void main(String[] args) { 
  UploadServer server=new UploadServer(); 
  UploadThread command=new UploadThread(); 
  server.start(command); 
 } 
  
 /** 
  * 功能：接受连接，开启子线程，循环 
  * @param command 用于下载的子线程对象，该对象实现了Runnable接口 
  */ 
 private void start(UploadThread command){ 
  //局部变量 
  ServerSocket serverSocket = null; 
  Socket transSocket; 
  //业务逻辑 
  try { 
   serverSocket=new ServerSocket(55555); 
   while(true){ 
    System.out.println("等待连接……"); 
    transSocket=serverSocket.accept(); 
    int i=0; 
    i++; 
    System.out.println("第"+i+"个连接"); 
    //用不用在下载完后关闭线程呢？？？ 
    command.setSocket(transSocket); 
    Executors.newFixedThreadPool(5).execute(command); 
   } 
  //异常捕获 
  } catch (IOException e) { 
   e.printStackTrace(); 
  //关闭资源 
  } finally{ 
   try { 
    serverSocket.close(); 
   } catch (IOException e) { 
    e.printStackTrace(); 
   } 
  }//End of try 
 }//End of connect 
 @Test 
 public void testConnect() { 
  //测试任务：先运行服务器端，然后多次运行客户端，服务器段可以不断创建子线程，则测试成功 
  //测试准备：构造一个线程，用于模拟下载线程 
  UploadThread command=new UploadThread(); 
  start(command); 
   
 } 
 
 @Test 
 public void testDown() throws IOException { 
  byte[] buf; 
  ByteArrayInputStream bis; 
  String str="canglaoshi.avi\ncontent,content,content"; 
  buf=str.getBytes(); 
  bis=new ByteArrayInputStream(buf); 
  UploadThread ut=new UploadThread(); 
  ut.down(bis); 
 } 
} 
//完成各个传输任务的子线程 
class UploadThread implements Runnable{ 
  
 Socket socket; 
 public UploadThread(){} 
 public UploadThread(Socket socket){ 
  this.socket=socket; 
 } 
 @Override 
 public void run() { 
  InputStream in; 
  try { 
    
   in = socket.getInputStream(); 
   down(in); 
    
  //异常处理 
  } catch (IOException e) { 
   e.printStackTrace(); 
  } finally{ 
   try { 
    socket.close(); 
   } catch (IOException e) { 
    e.printStackTrace(); 
   } 
  } 
  //测试代码 
  /*try { 
   Thread.sleep(5000); 
   System.out.println(Thread.currentThread().getName()+",复制完毕"); 
  } catch (InterruptedException e) { 
   e.printStackTrace(); 
  }*/ 
 }//End of run 
 public void setSocket(Socket socket){ 
  this.socket=socket; 
 } 
 //下载方法 
 /** 
  * 目标：把InputStream中的数据写入到本地 
  * 思路： 
  * 1.获取输入流,最好传入输入流，而不是直接从Socket获取，传入有利用单元测试 
  * 2.从输入流中读到文件名 
  * 3.新建文件和文件输出流 
  * 4.从输入流中读到文件内容到文件输出流 
  * 5. 
  * @throws IOException 
  */ 
 public void down(InputStream in) throws IOException{ 
  //局部变量 
  char ch; 
  char[] nameArr=new char[256]; 
  byte[] buf=new byte[1024]; 
  String name=""; 
  OutputStream out = null; 
  //业务逻辑 
  try { 
   //第一步：获取文件名，构造文件输出流 
   int i=0; 
   while((ch=(char) in.read())!='\n'){ 
    nameArr[i++]= ch; 
   } 
   //name=nameArr.toString();//这句话无法将字符数组转换为字符串，需用下面的语句 
   name=new String(nameArr); 
   System.out.println("要下载的文件为："+name); 
   out=new FileOutputStream("src\\down\\"+name); 
   //第二步：将输入流中的其他内容写入到文件 
   int len; 
   while((len=in.read(buf))!=-1){ 
    out.write(buf,0,len); 
   } 
   out.flush(); 
  //异常捕获 
  } catch (IOException e) { 
   e.printStackTrace(); 
  //关闭资源 
  }finally{ 
   //疑问：两个捕获可不可以放到一块呢，怎样处理关闭流时的异常最好呢？ 
   in.close(); 
   out.close(); 
  } 
  //调试 
  System.out.println(name); 
 } 
  
}//End of UploadThread 

/** 
 * 使用TCP协议实现上传功能的客户端 
 * @author yajun 
 */ 
public class UploadClient { 
  
 public static void main(String[] args) { 
  UploadClient client=new UploadClient(); 
  client.upload("src\\thursday\\AsListTest.java"); 
 } 
 
 /** 
  * 作用：上传文件到服务器 
  * 1.建立到服务器的连接 
  * 2.获取输出流 
  * 3.将文件内容写入到输出流 
  * 4.获取服务器的响应 
  */ 
 private void upload(String name){ 
  Socket socket=null; 
  OutputStream out; 
  try { 
   socket=new Socket("127.0.0.1", 55555); 
   out=socket.getOutputStream(); 
   write2OutputStream(name, out); 
  //异常捕获 
  } catch (UnknownHostException e) { 
   e.printStackTrace(); 
  } catch (IOException e) { 
   e.printStackTrace(); 
  } 
 } 
 @Test 
 public void testUpload() { 
  upload("src\\status.xml"); 
 } 
 /** 
  * 作用：传入文件名和输出流，将文件写入到输出流 
  * @param path 
  * @throws IOException 
  */ 
 private void write2OutputStream(String path,OutputStream out) throws IOException{ 
   
  FileInputStream fis = null; 
  byte[] buf=new byte[1024]; 
  String fileName=""; 
  //业务逻辑 
  try { 
    
   //1.写入文件名 
   fileName=path.substring(path.lastIndexOf('\\')+1); 
   System.out.println("您要上传的文件名为："+fileName); 
   out.write(fileName.getBytes()); 
   out.write('\n'); 
   //2.写入文件内容 
   fis=new FileInputStream(path); 
   int len; 
   while((len=fis.read(buf))!=-1){ 
    out.write(buf, 0, len); 
   } 
   out.flush(); 
  //异常处理 
  } catch (IOException e) { 
   e.printStackTrace(); 
  //关闭资源 
  } finally{ 
   fis.close(); 
   out.close(); 
  } 
 }//End of upload 
 @Test 
 public void testWrite2OutputStream() throws IOException { 
  ByteArrayOutputStream out = null; 
  try { 
   out=new ByteArrayOutputStream(); 
   write2OutputStream("src\\status.xml", out); 
   System.out.println(out.toString("utf-8")); 
  } catch (IOException e) { 
   e.printStackTrace(); 
  } finally{ 
   out.close(); 
  } 
   
 } 
  
}