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网络编程_发送端的数据来自于键盘录入案例

package cn.itcast_04;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class ReceiveDemo {
  public static void main(String[] args) throws IOException {
    // 创建接收端Socket对象
    DatagramSocket ds = new DatagramSocket(12345);

    while (true) {
      // 创建接收数据包对象
      byte[] bys = new byte[1024];
      DatagramPacket dp = new DatagramPacket(bys, bys.length);

      // 接收数据包
      ds.receive(dp);

      // 解析数据,并显示在控制台
      String ip = dp.getAddress().getHostAddress();
      String s = new String(dp.getData(), 0, dp.getLength());
      System.out.println("from" + ip + " data is:" + s);
    }
    // 释放资源
    // ds.close();
  }
}      
package cn.itcast_04;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

/*
 * 数据来自于键盘录入
 * 键盘录入要自已控制录入结束。
 */
public class SedDemo {
  public static void main(String[] args) throws IOException {
    // 创建发送端Socket对象
    DatagramSocket ds = new DatagramSocket();

    // 封装键盘录入数据
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String line = null;
    while ((line = br.readLine()) != null) {
      if ("886".equals(line)) {
        break;
      }

      // 创建数据,并打包
      byte[] bys = line.getBytes();
      // DatagramPacket dp = new DatagramPacket(bys, bys.length,
      // InetAddress.getByName("192.168.31.165"), 12345);

      DatagramPacket dp = new DatagramPacket(bys, bys.length,
          InetAddress.getByName("192.168.31.255"), 12345);

      // 发送数据
      ds.send(dp);
    }

    // 释放资源
    ds.close();

  }
}