corejava第10版

corejava第10版/v2ch04/server/EchoServer.java

@@ -0,0 +1,46 @@
+package server;
+
+import java.io.*;
+import java.net.*;
+import java.util.*;
+
+/**
+ * This program implements a simple server that listens to port 8189 and echoes back all client
+ * input.
+ * @version 1.21 2012-05-19
+ * @author Cay Horstmann
+ */
+public class EchoServer
+{
+   public static void main(String[] args) throws IOException
+   {
+      // establish server socket
+      try (ServerSocket s = new ServerSocket(8189))
+      {
+         // wait for client connection
+         try (Socket incoming = s.accept())
+         {
+            InputStream inStream = incoming.getInputStream();
+            OutputStream outStream = incoming.getOutputStream();
+   
+            try (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;
+               }
+            }
+         }
+      }
+   }
+}