17.网络编程
2021/5/31 12:25:31
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package com.atguigu.java2; import java.net.InetAddress; import java.net.UnknownHostException; /* 一、网络编程中两个主要的问题: 1.定位网络上一台或多台主机:定位主机上的特定应用 2.找到主机后,可靠高效地进行数据传输 二、网络编程中两要素 1.提供具体的ip以及端口号 2.提供网络通信协议:TCP/IP参考模型:应用层、传输层、网络层、物理+数据链路层 IP和端口号 在java中使用InetAddress类代表IP IP分类 :Ipv4 和IPv6 域名: www.baidu.com 本地回路地址:127.0.0.1 对应 localhost 端口号标识正在计算机上运行的进程 传输控制协议TCP协议 用户数据报协议UDP */ public class InterAddressTest { public static void main(String[] args) { try { InetAddress inet = InetAddress.getByName("192.168.10.14"); } catch (UnknownHostException e) { e.printStackTrace(); } } }
TCP
package com.atguigu.java2; import org.junit.Test; import java.io.*; import java.net.InetAddress; import java.net.ServerSocket; import java.net.Socket; /* TCP网络编程 练习:客户端发送文件给服务器,服务器端保存到本地, 并返回”发送成功“给客户端,并关闭相应连接 */ public class TCPTest { @Test public void clinet(){ Socket socket = null; OutputStream os = null; FileInputStream fis = null; InputStream is = null; ByteArrayOutputStream baos =null; try { //1. socket = new Socket(InetAddress.getByName("127.0.0.1"), 9988); //2 os = socket.getOutputStream(); // fis = new FileInputStream(new File("timg.jpg")); // byte[] buffer = new byte[1024]; int len; while((len = fis.read(buffer)) != -1) { os.write(buffer,0,len); } //关闭数据的输出 socket.shutdownOutput(); //接受来自服务器端信息,并显示到控制台 is = socket.getInputStream(); baos = new ByteArrayOutputStream(); byte[] buffer1 = new byte[20]; int len1 ; while((len1 = is.read(buffer1))!=-1){ baos.write(buffer1,0,len1); } System.out.println(baos.toString()); } catch (IOException e) { e.printStackTrace(); } finally { //5.关闭流操作 try { baos.close(); } catch (Exception e) { e.printStackTrace(); } try { fis.close(); } catch (IOException e) { e.printStackTrace(); } try { os.close(); } catch (IOException e) { e.printStackTrace(); } try { socket.close(); } catch (IOException e) { e.printStackTrace(); } } } @Test public void server(){ ServerSocket ss = null; Socket socket = null; InputStream is = null; FileOutputStream fos = null; OutputStream os = null; try { //1 ss = new ServerSocket(9988); //2 socket = ss.accept(); //3 is = socket.getInputStream(); //4 fos = new FileOutputStream(new File("longmao.jpg")); byte[] buffer = new byte[1024]; int len; while((len = is.read(buffer))!=-1){ fos.write(buffer,0,len); } os = socket.getOutputStream(); os.write("你好,图片已收到".getBytes()); } catch (IOException e) { e.printStackTrace(); } finally { try { os.close(); } catch (Exception e) { e.printStackTrace(); } try { fos.close(); } catch (IOException e) { e.printStackTrace(); } try { is.close(); } catch (IOException e) { e.printStackTrace(); } try { socket.close(); } catch (IOException e) { e.printStackTrace(); } try { ss.close(); } catch (IOException e) { e.printStackTrace(); } } } }
UDP
package com.atguigu.java2; import org.junit.Test; import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; /* UDP的网络编程 */ public class UDPTest { //发送端 @Test public void sender() throws IOException { DatagramSocket socket = new DatagramSocket(); String str= "UDP方式发送信息"; byte[] data = str.getBytes(); InetAddress inet = InetAddress.getLocalHost(); DatagramPacket packet = new DatagramPacket(data,0,data.length,inet,9090); socket.send(packet); socket.close(); } //接受端 @Test public void receiver() throws IOException { DatagramSocket socket = new DatagramSocket(9090); byte[] buffer = new byte[100]; DatagramPacket packet = new DatagramPacket(buffer,0,buffer.length); socket.receive(packet); System.out.println(new String(packet.getData(),0,packet.getLength())); socket.close(); } }
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