DataInputStream的使用,读阻塞

今天写了个程序,观看HTTP上传文件的流格式,发现:

DataInputSteam的 readFully(byte b[ ] )方法,当不能完全填充b[ ]时, 会阻塞程序的执行,直到读到足够的数据为止,

程序才继续执行下去!

代码:

 

import  java.io.BufferedReader;
import  java.io.DataInputStream;
import  java.io.DataOutputStream;
import  java.io.EOFException;
import  java.io.IOException;
import  java.io.InputStreamReader;
import  java.io.OutputStream;
import  java.net.ServerSocket;
import  java.net.Socket;

public   class  HttpServer  extends  Thread  ... {
    private int SERVER_PORT=3221;
    private ServerSocket s=null;
    public HttpServer() throws IOException...{
       
        s=new ServerSocket(SERVER_PORT);
        
    
}
    public HttpServer(int SERVER_PORT) throws IOException...{
            this.SERVER_PORT=SERVER_PORT;
            s=new ServerSocket(SERVER_PORT);
            
        
    }
    
    public void run()...{
        try ...{
            
            while(true)...{
            Socket socket=s.accept();
            System.out.println("响应客户端："+System.currentTimeMillis());
            new Answer2Client(socket).start();
            }
            
        } catch (IOException e) ...{
            System.out.println("HttpServer-->run()方法中出错");
            e.printStackTrace();
        }
        
    }
     
    public static void main(String sssp[]) throws Exception...{
        HttpServer server=null;
        if(sssp.length!=0)
            server=new HttpServer(Integer.parseInt(sssp[0]));
        else
           server=new HttpServer();
        
        server.start();
    }
    
}
class  Answer2Client  extends  Thread ... {
    private Socket client=null;
    private byte[] b=new byte[10240];
    public Answer2Client(Socket ss)...{
         this.client=ss;
    }
    
    
    public void run()...{
        try ...{
            BufferedReader  datain=new BufferedReader(new InputStreamReader(client.getInputStream()));
            while(true)...{
                
        //    datain.readFully(b);
            String line=datain.readLine();
            if(line==null)break;
                System.out.println(line);
            
            }//while
            
            System.out.println("  结--------束");
            
        }catch(IOException e) ...{
            System.out.print("  结束");
            e.printStackTrace();
        }
        //响应
        
        DataOutputStream dataout;
        try ...{
            dataout = new DataOutputStream(client.getOutputStream());
            String time=System.currentTimeMillis()+" 时间time";
            dataout.writeChars(""+time+"");
            dataout.flush();
            dataout.close();
            client.shutdownOutput();
            client.shutdownInput();    
            client.close();
    
            
        } catch (IOException e) ...{
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    
        
    }
}

程序不能正长结束,不知道怎么关闭套界字,和流