一个基于Java实现的Github issue图片自动下载工具

package youdao;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.json.JSONObject;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class Github {

	private static String mTitle = null;
	private static final String PREFIX = "C:\\Users\\i042416\\Pictures\\";
	
	private static void createFolder(String title){
		DownloadTask.FOLDER = PREFIX + title;
		File file = new File( DownloadTask.FOLDER);
		file.mkdir();
	}
	
	
	private static List<DownloadTask> getGithubPicUrlList(String formattedUrl){
		HttpClient client = HttpClients.createDefault();
		List<DownloadTask> resultPic = new ArrayList<DownloadTask>();
		int index = 0;
		
	    HttpGet get = new HttpGet(formattedUrl);
	        try {
	            HttpResponse response = client.execute(get);
	            HttpEntity entity = response.getEntity();
	            String result = EntityUtils.toString(entity, "UTF-8");
	            JSONObject obj = new JSONObject(result);
	            
	            mTitle = obj.get("tl").toString();
	            createFolder(mTitle);
	            String content = obj.get("content").toString();
	            // System.out.println("content: " + content);
	            
	            Matcher m = Pattern.compile("src\\s*=\\s*\"?(.*?)(\"|>|\\s+)").matcher(content);
	            while (m.find()) {
	                    // System.out.println(m.group(1));
	                    DownloadTask task = new DownloadTask(m.group(1), index++);
	                    resultPic.add(task);
	            }
	        } catch (Exception e){
	        	e.printStackTrace();
	        }
	        return resultPic;
	}
	
	private static List<DownloadTask> getGithubIssuePicUrlList(String githubIssueUrl){
		HttpClient client = HttpClients.createDefault();
		List<DownloadTask> resultPic = new ArrayList<DownloadTask>();
		int index = 0;
		
	    HttpGet get = new HttpGet(githubIssueUrl);
	        try {
	            HttpResponse response = client.execute(get);
	            HttpEntity entity = response.getEntity();
	            String result = EntityUtils.toString(entity, "UTF-8");
	            JSONObject obj = new JSONObject(result);
	            
	            mTitle = obj.get("title").toString();
	            createFolder(mTitle);
	            String content = obj.get("body").toString();
	            System.out.println("content: " + content);
	            
	            // ![clipboard2](https://user-int.com/5669954/32708736946.png)
	            
	            
	            // Matcher m = Pattern.compile("^\\d{n,}$").matcher(content);
	            Matcher m = Pattern.compile(".*!\\[.*?\\]\\(.*?\\).*").matcher(content);
	            while (m.find()) {
	                    // System.out.println(m.group(1));
	                    DownloadTask task = new DownloadTask(m.group(1), index++);
	                    resultPic.add(task);
	            }
	        } catch (Exception e){
	        	e.printStackTrace();
	        }
	        return resultPic;
	}
	
	private static void start(List<DownloadTask> task){
		if( task.isEmpty()){
			System.out.println("No picture to download!");
			return;
		}
		System.out.println("Total pic to be downloaded: " + task.size());
		ExecutorService executor = Executors.newFixedThreadPool(10);
		
		for( int i = 0; i < task.size(); i++){
			PictureDownloader cc = new PictureDownloader(task.get(i));
			executor.execute(cc);			
		}
		
		executor.shutdown();
		while (!executor.isTerminated()) {
        }
		
		System.out.println("download finished");
	}
	
	public static void main(String[] args) {
		
		/*String urlStr = "https://api.github.com/repos/i042416/KnowlegeRepository/issues/955";
		
		System.out.println(urlStr);
		List<DownloadTask> task = getGithubIssuePicUrlList(urlStr);
		start(task);*/
		
		String a = "![clipboard1](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/985c0d6b1bd0421b8fbec98d3814de97~tplv-k3u1fbpfcp-zoom-1.image) fuck";
		a = a + "\n" + "![clipboard2](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/34f114badbce4a9a8f2bd386e78d8a21~tplv-k3u1fbpfcp-zoom-1.image)";
		Matcher m = Pattern.compile(".*\\!\\[.*\\]\\((.*)\\).*").matcher(a);
        while (m.find()) {
        		int group_code = m.groupCount();
        		System.out.println("group count: " + group_code);
                System.out.println("image: " + m.group(1));
        }
		
	}
}