corejava第10版

corejava第10版/v2ch04/threaded/ThreadedEchoServer.java

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+package threaded;
+
+import java.io.*;
+import java.net.*;
+import java.util.*;
+
+/**
+ * This program implements a multithreaded server that listens to port 8189 and echoes back 
+ * all client input.
+ * @author Cay Horstmann
+ * @version 1.22 2016-04-27
+ */
+public class ThreadedEchoServer
+{  
+   public static void main(String[] args )
+   {  
+      try (ServerSocket s = new ServerSocket(8189))
+      {  
+         int i = 1;
+
+         while (true)
+         {  
+            Socket incoming = s.accept();
+            System.out.println("Spawning " + i);
+            Runnable r = new ThreadedEchoHandler(incoming);
+            Thread t = new Thread(r);
+            t.start();
+            i++;
+         }
+      }
+      catch (IOException e)
+      {  
+         e.printStackTrace();
+      }
+   }
+}
+
+/**
+ * This class handles the client input for one server socket connection. 
+ */
+class ThreadedEchoHandler implements Runnable
+{ 
+   private Socket incoming;
+
+   /**
+      Constructs a handler.
+      @param incomingSocket the incoming socket
+   */
+   public ThreadedEchoHandler(Socket incomingSocket)
+   { 
+      incoming = incomingSocket; 
+   }
+
+   public void run()
+   {  
+      try (InputStream inStream = incoming.getInputStream();
+         OutputStream outStream = incoming.getOutputStream())
+      {            
+            Scanner in = new Scanner(inStream, "UTF-8");         
+            PrintWriter out = new PrintWriter(
+               new OutputStreamWriter(outStream, "UTF-8"),
+               true /* autoFlush */);
+            
+            out.println( "Hello! Enter BYE to exit." );
+            
+            // echo client input
+            boolean done = false;
+            while (!done && in.hasNextLine())
+            {  
+               String line = in.nextLine();            
+               out.println("Echo: " + line);            
+               if (line.trim().equals("BYE"))
+                  done = true;
+            }
+      }
+      catch (IOException e)
+      {  
+         e.printStackTrace();
+      }
+   }
+}