Java学习之路--网络编程相关04

package com.kuang.lesson04;

import java.net.MalformedURLException;
import java.net.URL;

//2023.3.8/9 URL 下载网络资源
public class URLDemo01 {
    public static void main(String[] args) throws MalformedURLException {
        URL url = new URL("https://localhost:8080/helloworld/index.jsp?usename=caidingchao&password=123");
        System.out.println(url.getProtocol());//协议
        System.out.println(url.getHost());//主机IP
        System.out.println(url.getPort());//端口号
        System.out.println(url.getPath());//全路径
        System.out.println(url.getFile());//下载的文件
        System.out.println(url.getQuery());//参数
    }
}

//

package com.kuang.lesson04;

import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

//2023.3.10 URL 下载文件资源
public class URLDown {
    public static void main(String[] args) throws Exception {
        //1.下载地址
        URL url = new URL("http://localhost:8080/CaiDingChao/study.txt");

        //2.连接到这个资源 HTTP
        HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();

        InputStream inputStream = httpURLConnection.getInputStream();

        FileOutputStream fileOutputStream = new FileOutputStream("study.txt");

        byte[] buffer = new byte[1024];
        int len;
        while ((len = inputStream.read(buffer))!= -1){
            fileOutputStream.write(buffer,0,len);//写出这个数据
        }

        fileOutputStream.close();
        inputStream.close();
        httpURLConnection.disconnect();
    }
}