java26

一.学习内容
网络编程
练习代码
（1）服务器端代码

package com.demo02;

import java.io.*;
import java.net.*;
import java.util.*;
public class ServerDemo {
public static void main(String[] args) {
	try (
		ServerSocket server =new ServerSocket(4259);
		Socket socket=server.accept();
		BufferedReader is=new BufferedReader(new InputStreamReader(socket.getInputStream()));
		PrintWriter os = new PrintWriter(socket.getOutputStream());
		Scanner input=new Scanner(System.in);
		){
		System.out.println("客户端："+is.readLine());
		System.out.println("服务器端：");
		String line=input.nextLine();
		while(!line.equals("bye")){
			os.println(line);
			os.flush();
			System.out.println("客户端："+is.readLine());
			System.out.println("服务器端：");
			line=input.nextLine();
		}
	}catch(IOException e) {
		System.out.println("发生异常："+e);
	}
}
}

（2）客户端代码

package com.demo02;
import java.io.*;
import java.net.*;
import java.util.*;

public class ClinentDemo {
public static void main(String[] args) {
	try(
		Socket socket=new Socket("127.0.0.1",4259);
		BufferedReader is=new BufferedReader(new InputStreamReader(socket.getInputStream()));
		PrintWriter os=new PrintWriter(socket.getOutputStream());
		Scanner input=new Scanner(System.in);
		){
		System.out.println("客户端：");
		String line=input.nextLine();
		while(!line.equals("bye")){
			os.println(line);
			os.flush();
			System.out.println("服务器端："+is.readLine());
			System.out.println("客户端：");
			line=input.nextLine();
		}
	}catch(IOException e) {
		System.out.println("发生异常："+e);
	}
}
}

（3）查询IP

package com.demo02;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class FindIpDemo {
 public static void main(String[] args) {
	try {//查询网络地址
		InetAddress idAddress1 =InetAddress.getByName("127.0.0.1");
		System.out.println(idAddress1);
		InetAddress idAddress2=InetAddress.getLocalHost();
		System.out.println(idAddress2);
		InetAddress idAddress3=InetAddress.getByName("localhaost");
		System.out.println(idAddress3);
		//查询网站地址
		InetAddress idAddress4=InetAddress.getByName("www.baidu.com");
		System.out.println(idAddress4);
        //常用方法		System.out.println(idAddress4.getAddress());
		System.out.println(idAddress4.getHostAddress());
		System.out.println(idAddress4.getHostName());
		System.out.println(idAddress4.getCanonicalHostName());
		System.out.println();
	}catch(UnknownHostException e) {
		e.printStackTrace();
	}
}
}

（4）通过URL获取文件内容

package com.demo02;

import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Date;
public class MyURL {
void display() {
	byte buffer[]=new byte[50];
	System.out.println("请你输入要获取文件的URL地址");
	try {
		int count=System.in.read(buffer);
		String addr=new String(buffer,0,count);
		URL url=new URL(addr);
		URLConnection c =url.openConnection();
	    c.connect();
		System.out.println("内容类型："+c.getContentType());
		System.out.println("内容编号："+c.getContentEncoding());
		System.out.println("内容长度："+c.getContentLength());
		System.out.println("创建日期："+new Date(c.getDate()));
		System.out.println("最后修改日期："+new Date(c.getLastModified()));
		System.out.println("终止日期："+new Date(c.getExpiration()));
	}catch(IOException e) {
		e.printStackTrace();
	}
}
public static void main(String[] args) {
	MyURL app=new MyURL();
	app.display();
}
}

标签：java,java26,System,import,println,new,out
来源： https://blog.csdn.net/m0_55680205/article/details/117701870