JKXY的视频内容下载工具类

package cn.jsonlu.make.license;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import org.junit.Test;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

/**
 * Author:JsonLu
 * DateTime:16/7/28 09:23
 * Email:jsonlu@qq.com
 * Desc:
 */
public class FileUpload {

    private List<File> list = new ArrayList();
    private List<String> urls = new ArrayList<String>();
    private final String path = "D:\res\cordova";

    @Test
    public void test() throws Exception {
        File root = new File(path);
        getAllFiles(root);
        for (File file : list) {
            readTxtFile(file);
        }
        for (String url : urls) {
            int len = url.split("/").length;
            String name = url.split("/")[len - 1];
            DownloadMP4 downloadMP4 = new DownloadMP4();
            downloadMP4.downLoadFromUrl(url, name, path);
        }

    }

    /**
     * 读取目录下的文件内容
     *
     * @param file
     */
    private void readTxtFile(File file) {
        try {
            String encoding = "UTF-8";
            if (file.isFile() && file.exists()) { //判断文件是否存在
                InputStreamReader read = new InputStreamReader(new FileInputStream(file), encoding);//考虑到编码格式
                BufferedReader bufferedReader = new BufferedReader(read);
                String lineTxt = null;
                while ((lineTxt = bufferedReader.readLine()) != null) {
                    JSONObject object = JSON.parseObject(lineTxt);
                    JSONObject u = object.getJSONObject("data");
                    String url = u.getString("url");
                    urls.add(url);
                }
                read.close();
            } else {
                System.out.println("找不到指定的文件");
            }
        } catch (Exception e) {
            System.out.println("读取文件内容出错");
            e.printStackTrace();
        }

    }

    /**
     * 遍历目录下的文件
     *
     * @param dir
     * @throws Exception
     */
    private void getAllFiles(File dir) throws Exception {
        File[] fs = dir.listFiles();
        for (int i = 0; i < fs.length; i++) {
            list.add(fs[i].getAbsoluteFile());
            if (fs[i].isDirectory()) {
                try {
                    getAllFiles(fs[i]);
                } catch (Exception e) {
                }
            }
        }
    }

    class DownloadMP4 {

        /**
         * 从网络Url中下载文件
         *
         * @param urlStr
         * @param fileName
         * @param savePath
         * @throws IOException
         */
        public void downLoadFromUrl(String urlStr, String fileName, String savePath) throws IOException {
            URL url = new URL(urlStr);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            //设置超时间为3秒
            conn.setConnectTimeout(3 * 1000);
            //防止屏蔽程序抓取而返回403错误
            conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Linux; Android 6.0; HUAWEI NXT-DL00 Build/HUAWEINXT-DL00) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/37.0.0.0 Mobile MQQBrowser/6.2 TBS/036523 Safari/537.36 V1_AND_SQ_6.3.7_374_YYB_D QQ/6.3.7.2795 NetType/WIFI WebP/0.3.0 Pixel/1080");
            //得到输入流
            InputStream inputStream = conn.getInputStream();
            //获取自己数组
            byte[] getData = readInputStream(inputStream);

            //文件保存位置
            File saveDir = new File(savePath);
            if (!saveDir.exists()) {
                saveDir.mkdir();
            }
            File file = new File(saveDir + File.separator + fileName);
            FileOutputStream fos = new FileOutputStream(file);
            fos.write(getData);
            if (fos != null) {
                fos.close();
            }
            if (inputStream != null) {
                inputStream.close();
            }
            System.out.println("download success:" + url);
        }


        /**
         * 从输入流中获取字节数组
         *
         * @param inputStream
         * @return
         * @throws IOException
         */
        private byte[] readInputStream(InputStream inputStream) throws IOException {
            byte[] buffer = new byte[1024];
            int len = 0;
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            while ((len = inputStream.read(buffer)) != -1) {
                bos.write(buffer, 0, len);
            }
            bos.close();
            return bos.toByteArray();
        }
    }

}