还是一个socket的问题，大人物们，谢谢了！

lewiha 2004-11-22 12:45:51

这是一个多客户端的服务器上的代码，我的问题是：为什么在给每个客户打开一个thread后
在thread里的run中为什么还有个死循环while(true)，它有什么作用？但运行后，确不会一直
运行那个死循环？
见代码：（第二个while(true））
// MultiThreadsServer.java: The server can communicate with
// multiple clients concurrently using the multiple threads
import java.io.*;
import java.net.*;

public class MultiThreadServer
{
// Main method
public static void main(String[] args)
{
try
{
// Create a server socket
ServerSocket serverSocket = new ServerSocket(8000);

// To number a client
int clientNo = 1;
Socket connectToClient = serverSocket.accept();

while (true)
{
// Listen for a new connection request

// Print the new connect number on the console
System.out.println("Start thread for client " + clientNo);

// Find the client's hostname, and IP address
InetAddress clientInetAddress =
connectToClient.getInetAddress();
System.out.println("Client " + clientNo + "'s hostname is "
+ clientInetAddress.getHostName());
System.out.println("Client " + clientNo + "'s IP Address is "
+ clientInetAddress.getHostAddress());

// Create a new thread for the connection
HandleAClient thread = new HandleAClient(connectToClient, clientNo);

// Start the new thread
thread.start();

// Increment clientNo
clientNo++;
}
}
catch(IOException ex)
{
System.err.println(ex);
}
}
}

// Define the thread class for handling a new connection
class HandleAClient extends Thread
{
private Socket connectToClient; // A connected socket
private int clientNo; // Indicate client no

// Construct a thread
public HandleAClient(Socket socket, int clientNo)
{
connectToClient = socket;
this.clientNo = clientNo;
}

// Implement the run() method for the thread
public void run()
{
try
{
// Create data input and output streams
DataInputStream isFromClient = new DataInputStream(
connectToClient.getInputStream());
DataOutputStream osToClient = new DataOutputStream(
connectToClient.getOutputStream());

// Continuously serve the client
while (true) //就是这个，为什么要用？
{
// Receive radius from the client
double radius = isFromClient.readDouble();
System.out.println("radius received from client " +
clientNo + ": " + radius);

// Compute area
double area = radius*radius*Math.PI;

// Send area back to the client
osToClient.writeDouble(area);
System.out.println("Area found: " + area);
}
}
catch(IOException ex)
{
System.err.println(ex);
}
}
}

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