URL下载网络资源

/**
 * @Description URL下载网络资源
 */
package com.ai.lesson04;

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

public class URLDemo01 {
    public static void main(String[] args) throws MalformedURLException {
        URL url = new URL("http://localhost:8080/helloworld/index.jsp?username=aifu&password=123");
        System.out.println(url.getProtocol());  //协议
        System.out.println(url.getHost());  //主机ip
        System.out.println(url.getPort());  //端口
        System.out.println(url.getPath());  //文件
        System.out.println(url.getFile());  //全路径
        System.out.println(url.getQuery()); //参数
    }
}

/**
 * @Description URL下载网络资源
 */
package com.ai.lesson04;

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

public class UrlDown {
    public static void main(String[] args) throws Exception{
        //1.下载地址
        URL url = new URL("https://localhost:8080/aifu/SecurityFile.txt");

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

        InputStream inputStream = urlConnection.getInputStream();

        FileOutputStream fos = new FileOutputStream("SecurityFile.jpg");

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

        fos.close();
        inputStream.close();
        urlConnection.disconnect(); //断开连接
    }
}