[Java知识库]java 下载文件

package com.chat;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

public class UrlDemo {
    public static void main(String[] args) throws IOException {
//       1.创建下载地址
        final URL url = new URL("http://file.znclass.com/1648534784367检查必传字段.mp4");
//       2.链接这个资源
        final URLConnection urlConnection = url.openConnection();
        final InputStream inputStream = urlConnection.getInputStream();
        final FileOutputStream fileOutputStream = new FileOutputStream("1.mp4");
        final byte[] bytes = new byte[1024];
        int len;

        while ((len = inputStream.read(bytes)) != -1){
            fileOutputStream.write(bytes,0 ,len);
        }
        fileOutputStream.close();
        inputStream.close();
    }
}