目录
1.IP
package com.qyx.www.lesson11;
import java.net.InetAddress;
import java.net.UnknownHostException;
//测试IP
public class TestInetAddress {
public static void main(String[] args) {
try {
InetAddress inetAddress1 = InetAddress.getByName("127.0.0.1");
System.out.println(inetAddress1);
InetAddress inetAddress3 = InetAddress.getByName("localhost");
System.out.println(inetAddress3);
InetAddress inetAddress4 = InetAddress.getLocalHost();
System.out.println(inetAddress4);
//查询网站ip地址
InetAddress inetAddress2 = InetAddress.getByName("www.baidu.com");
System.out.println(inetAddress2);
//常用方法
//System.out.println(inetAddress2.getAddress());
System.out.println(inetAddress2.getCanonicalHostName());//规范的名字
System.out.println(inetAddress2.getHostAddress());//ip
System.out.println(inetAddress2.getHostName()); //域名，或者自己电脑的名字
} catch (UnknownHostException e) {
e.printStackTrace();
}
}
}
2.TcpClientDemo01客户端
package com.qyx.www.lesson11;
import java.io.IOException;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
public class TcpClientDemo01 {
public static void main(String[] args) {
Socket socket = null;
OutputStream os = null;
try {
//1.要知道服务器的地址，端口号
InetAddress serverIP = InetAddress.getByName("127.0.0.1");
int port = 8080;
//2.创建一个socket连接
socket = new Socket(serverIP,port);
//3.发送消息 IO流
os = socket.getOutputStream();
os.write("你好，欢迎学习狂神说java".getBytes());
}catch (Exception e){
e.printStackTrace();
}finally {
if (os!=null){
try {
os.close();
}catch (IOException e){
e.printStackTrace();
}
}
if (socket!=null){
try {
socket.close();
}catch (IOException e){
e.printStackTrace();
}
}
}
}
}
3.TcpServerDemo01服务端
package com.qyx.www.lesson11;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class TcpServerDemo01 {
public static void main(String[] args) {
ServerSocket serverSocket = null;
Socket socket = null;
InputStream is = null;
ByteArrayOutputStream baos = null;
try {
//1.我得有一个地址
serverSocket = new ServerSocket(9999);
//2.等待客户端连接过来
socket = serverSocket.accept();
//3.读取客户端的消息
is = socket.getInputStream();
//管道流
baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len;
while ((len=is.read(buffer))!=-1){
baos.write(buffer,0,len);
}
System.out.println(baos.toString());
} catch (IOException e){
e.printStackTrace();
}finally {
//关闭资源
if (baos!=null){
try {
baos.close();
}catch (IOException e){
e.printStackTrace();
}finally {
//关闭资源
if (baos!=null){
try {
baos.close();
}catch (IOException e){
e.printStackTrace();
}
}
if (is!=null){
try {
is.close();
}catch (IOException e){
e.printStackTrace();
}
}
if (socket!=null){
try{
socket.close();
}catch (IOException e){
e.printStackTrace();
}
}
if (serverSocket!=null){
try{
serverSocket.close();
}catch (IOException e){
e.printStackTrace();
}
}
}
}
}
}
}
4.UdpClientDemo01 客户端
package com.qyx.www.lesson11;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.nio.charset.StandardCharsets;
//不需要连接服务器
public class UdpClientDemo01 {
public static void main(String[] args) throws Exception{
//1.建立一个Socket
DatagramSocket socket = new DatagramSocket();
//2.建个包
String msg = "你好啊，服务器！";
InetAddress localhost = InetAddress.getByName("localhost");
int port = 9095;
//数据，数据的长度起始，要发送给谁
DatagramPacket packet = new DatagramPacket(msg.getBytes(),0,msg.getBytes().length,localhost,port);
//3.发送包
socket.send(packet);
//4.关闭流
socket.close();
}
}
5.UdpServerDemo01 服务端
package com.qyx.www.lesson11;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
public class UdpServerDemo01 {
public static void main(String[] args) throws Exception{
//开放端口
DatagramSocket socket = new DatagramSocket(9090);
//接受数据包
byte[] buffer = new byte[1024];
DatagramPacket packet = new DatagramPacket(buffer,0,buffer.length);
socket.receive(packet); //阻塞接受
System.out.println(packet.getAddress().getHostAddress());
System.out.println(new String(packet.getData(),0, packet.getLength()));
//关闭连接
socket.close();
}
}
6.循环发送消息
package com.qyx.www.lesson11;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;
public class UdpSenderDemo01 {
public static void main(String[] args) throws Exception {
DatagramSocket socket = new DatagramSocket(8080);
//准备数据： 控制台读取 System.in
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
while (true){
String data = reader.readLine();
byte[] datas = data.getBytes();
DatagramPacket packet = new DatagramPacket(datas,0,datas.length,new InetSocketAddress("localhost",6666));
socket.send(packet);
if (data.equals("byte")){
break;
}
}
socket.close();
}
}
7.循环接收消息
package com.qyx.www.lesson11;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
public class UdpReceiveDemo01 {
public static void main(String[] args) throws Exception {
DatagramSocket socket = new DatagramSocket(6666);
while (true){
//准备接收包裹
byte[] container = new byte[1024];
DatagramPacket packet = new DatagramPacket(container,0,container.length);
socket.receive(packet); //阻塞式接受包裹
//断开连接 bye
byte[] data = packet.getData();
String receiveData = new String(data,0, data.length);
System.out.println(receiveData);
if (receiveData.equals("bye")){
break;
}
}
socket.close();
}
}
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