七牛クラウドストレージのダウンロードプライベートスペースファイル

package com.qiniu.kodo;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import com.qiniu.base.AccountMgr;
import com.qiniu.util.Auth;

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.ResponseBody;

/**
 *  
 * @author xuhuanchao
 *
 */
public class Download {

    // 
    Auth auth = Auth.create(AccountMgr.ACCESS_KEY, AccountMgr.SECRET_KEY);

    /**
     *  ， ：donwloadUrl
     * @return
     */
    public String getDownloadUrl(String targetUrl) {
        String downloadUrl = auth.privateDownloadUrl(targetUrl);
        return downloadUrl;
    }

    /**
     *  
     */
    public void download(String targetUrl) {
        // downloadUrl
        String downloadUrl = getDownloadUrl(targetUrl);
        // 
        String filePath = "/Users/xuhuanchao/Documents/admin/download/";
        download(downloadUrl, filePath);
    }


    /**
     *  http get  
     * @param url
     * @param filepath
     * @return
     */
    private static void download(String url, String filepath) {
        OkHttpClient client = new OkHttpClient();
        System.out.println(url);
        Request req = new Request.Builder().url(url).build();
        Response resp = null;
        try {
            resp = client.newCall(req).execute();
            System.out.println(resp.isSuccessful());
            if(resp.isSuccessful()) {
                ResponseBody body = resp.body();
                InputStream is = body.byteStream();
                byte[] data = readInputStream(is);
                File imgFile = new File(filepath + "admin_2.png");
                FileOutputStream fops = new FileOutputStream(imgFile);
                fops.write(data);
                fops.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("Unexpected code " + resp);
        }
    }

    /**
     *  
     * @param is
     * @return
     */
    private static byte[] readInputStream(InputStream is) {
        ByteArrayOutputStream writer = new ByteArrayOutputStream();
        byte[] buff = new byte[1024 * 2];
        int len = 0; 
        try {
            while((len = is.read(buff)) != -1) {
                writer.write(buff, 0, len);
            }
            is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return writer.toByteArray();
    }


    /**
     *  ： 
     * @param args
     */
    public static void main(String[] args) {
        // ；
        // ： http:// / 

        String targetUrl = "http://oddbqeh34.bkt.clouddn.com/admin_2.png";
        new Download().download(targetUrl);
    }

}