【Java TCP/IP Socket】TCP Socket通信中由read返回值造成的的死锁问题（含代码）

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  书上示例

    在第一章《基本套接字》中，作者给出了一个TCP Socket通信的例子——反馈服务器，即服务器端直接把从客户端接收到的数据原原本本地反馈回去。

     书上客户端代码如下：

import java.net.Socket;
import java.net.SocketException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class TCPEchoClient {

	public static void main(String[] args) throws IOException {

		if ((args.length < 2) || (args.length > 3))  // Test for correct # of args
			throw new IllegalArgumentException("Parameter(s): <Server> <Word> [<Port>]");

		String server = args[0];       // Server name or IP address
		// Convert argument String to bytes using the default character encoding
		byte[] data = args[1].getBytes();

		int servPort = (args.length == 3) ? Integer.parseInt(args[2]) : 7;

		// Create socket that is connected to server on specified port
		Socket socket = new Socket(server, servPort);
		System.out.println("Connected to server...sending echo string");

		InputStream in = socket.getInputStream();
		OutputStream out = socket.getOutputStream();

		out.write(data);  // Send the encoded string to the server

		// Receive the same string back from the server
		int totalBytesRcvd = 0;  // Total bytes received so far
		int bytesRcvd;           // Bytes received in last read
		while (totalBytesRcvd < data.length) {
			if ((bytesRcvd = in.read(data, totalBytesRcvd,data.length - totalBytesRcvd)) == -1)
				throw new SocketException("Connection closed prematurely");
			totalBytesRcvd += bytesRcvd;
		}  // data array is full

		System.out.println("Received: " + new String(data));

		socket.close();  // Close the socket and its streams
	}
}

      书上的服务器端代码如下：

import java.net.*;  // for Socket, ServerSocket, and InetAddress
import java.io.*;   // for IOException an