程序一；客戶端public class client2 { public static void main(String argv[]) throws UnknownHostException, IOException{ String str[]={"4","5","6"}; Socket socket=new Socket("localhost",8080); DataInputStream input=new DataInputStream(socket.getInputStream()); DataOutputStream output=new DataOutputStream(socket.getOutputStream()); for(String str1:str){ output.writeUTF(str1); String yourStr=input.readUTF(); System.out.println(yourStr); } socket.close(); }}服務器端public class Server2 { @SuppressWarnings("Deprecated") public static void main(String argv[]) throws UnknownHostException, IOException{ String str[]={"1","2","3"}; ServerSocket server=new ServerSocket(8080); Socket socket=server.accept(); System.out.println("succeed"); DataInputStream input=new DataInputStream(socket.getInputStream()); DataOutputStream output=new DataOutputStream(socket.getOutputStream()); for(String str1:str){ String yourStr=input.readUTF(); System.out.println(yourStr); output.writeUTF(str1); } socket.close(); server.close(); }}這里并沒有使用socket.shutdownOutput();程序正常運行程序二服務器端；public class Server { public static void main(String argv[]) throws IOException{ ServerSocket serverSocket=new ServerSocket(8888); System.out.println("succeed,wait client connects"); Socket socket=serverSocket.accept(); InputStream is=socket.getInputStream(); InputStreamReader isr=new InputStreamReader(is); BufferedReader reader=new BufferedReader(isr); String info=null; while((info=reader.readLine())!=null){ System.out.println("我是服務器，客戶端說"+info);} socket.shutdownInput(); OutputStream out=socket.getOutputStream(); PrintWriter writer=new PrintWriter(out); writer.write("welcome!"); writer.flush(); socket.close(); serverSocket.close(); }}客戶端；public class Client { public static void main(String[]argv) throws UnknownHostException, IOException{ Socket socket=new Socket("localhost",8888); OutputStream stream=socket.getOutputStream(); PrintWriter writer=new PrintWriter(stream); writer.println("用戶名:我;密碼:19"); writer.flush();// 此處 socket.shutdownOutput(); InputStream st=socket.getInputStream(); InputStreamReader read=new InputStreamReader(st); BufferedReader bu=new BufferedReader(read); String info=null; while((info=bu.readLine())!=null){ System.out.println(info); } socket.close(); }}這里如果去掉客戶端的?socket.shutdownOutput();程序將不能運行我不是很明白，請問有誰知道這是為什么嗎？