JAVA 小练习-５ 生成URL中要下载的文件名

import java.util.ArrayList;

public class GetFileName {
	public static void main(String[] args) {
		String url01 = "https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3252521864,872614242&fm=26&gp=0.jpeg";
		String url02 = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1589343968765&di=5fc5f226b8c89db60b9a07bc4fa5cc3d&imgtype=0&src=http%3A%2F%2Fa0.att.hudong.com%2F27%2F10%2F01300000324235124757108108752.gif";
		String url03 = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1589343968759&di=117c8e833e790986acf90ed8eb9e669a&imgtype=0&src=http%3A%2F%2Ffile.mtchome.com%2Fp%2F2014%2F12-16%2F7012d73ff9b73b117b12a30bbe7e718c.jpg";
		String url04 = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1589343968759&di=117c8e833e790986acf90ed8eb9e669a&imgtype=0&src=http%3A%2F%2Ffile.mtchome.com%2Fp%2F2014%2F12-16%2F7012d73ff9b73b117b12a30bbe7e718c.bmp";
		String url05 = "https://www.python.org/ftp/python/3.8.2/python-3.8.2.exe";
		String url06 = "https://downloads.mysql.com/archives/get/p/23/file/mysql-8.0.19-winx64.zip";
		String ur107 = "https://dlc2.pconline.com.cn/filedown4_1322_39001579/RabVgJwo/Adobe_Reader_XI_zh_CN@1918_1322.exe";
		
		ArrayList<String> arr = new ArrayList<String>();
		arr.add(url01);
		arr.add(url02);
		arr.add(url03);
		arr.add(url04);
		arr.add(url05);
		arr.add(url06);
		arr.add(ur107);
		for(String s: arr){
			Get_Wanted_Str(s);
		}
	}
	
	public static String Get_Wanted_Str(String original_str){
		ArrayList<String> arr_image = new ArrayList<String>();
		arr_image.add(".jpg");
		arr_image.add(".jpeg");
		arr_image.add(".bmp");
		arr_image.add(".gif");
		String ss;
		for(String s1:arr_image){
			Boolean bb = original_str.endsWith(s1);
			if (bb == true){
				ss = "timg"+s1;
				System.out.println(ss);
				return ss;
			}
		}
		int sub_string_index = original_str.lastIndexOf("/");
		String substring = original_str.substring(sub_string_index+1, original_str.length());
		System.out.println(substring);
		return substring;
	}
}

timg.jpeg
timg.gif
timg.jpg
timg.bmp
python-3.8.2.exe
mysql-8.0.19-winx64.zip
Adobe_Reader_XI_zh_CN@1918_1322.exe