通过url下载视频，合并多个输入流到一个输出流

通过循环遍历url下载多个视频并合并在一起，合并多个输入流到一个输出流：

package com.xw.smart.market.product.rest.controller;

import com.xw.smart.market.product.common.utils.DateUtils;
import com.xw.smart.market.product.service.MqService;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import okhttp3.Response;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/**

 */
@Slf4j
@RestController
@RequestMapping("mq")
public class MqController {

    @Autowired
    private MqService mqService;

    /**
     * 合并文件流
     */
    @ApiOperation("合并文件流")
    @GetMapping("/down")
    public void down(HttpServletResponse response) throws Exception {
        //前置url
        String urlStart = "https:/26/f53b02eb387702304506466117/v.f146750_";
        //后置url
        String urlEnd = ".ts?t=6328eea1&us=AGe942c700_oiGmVVazEz&time=1663583714248";
//        String urlVideo = urlStart + num + urlEnd;
        String currentDateTime = DateUtils.getCurrentDateStr();
        String spName = currentDateTime + "-8月18日-导师研究课-《鲁滨逊漂流记》整本书教学" + ".ts";
        // 所以使用win系统的自行更换
        String bdPath = "D:\soft\" + spName; // 保存到服务器的地址
        boolean downVideo = downVideo(urlStart, urlEnd, bdPath);
    }

    /**
     * 下载视频
     *
     * @param downloadPath 视频保存地址
     */
    public static boolean downVideo(String urlStart, String urlEnd, String downloadPath) {

        int num = 1;
        HttpURLConnection connection = null;
        InputStream inputStream = null;
        boolean re = false;
        try {
            //创建合并流对象
            FileOutputStream fos = new FileOutputStream(downloadPath);
            for (int i = 1; i < 3000; i++) {
                URL url = new URL(urlStart + i + urlEnd);
                log.info(String.valueOf(i));
                connection = (HttpURLConnection) url.openConnection();
                connection.setRequestProperty("Range", "bytes=0-");
                connection.connect();
                //校验访问状态，用来判断是否继续循环
                if (connection.getResponseCode() / 100 != 2) {
                    System.out.println("连接中断,数据已传输完成。");
                    fos.close();
                    return re;
                }
                inputStream = connection.getInputStream();
                //一次读取一个字节数组
                byte[] bytes = new byte[1024];
                int len = 0;
                while ((len = inputStream.read(bytes)) != -1) {
                    //写
                    fos.write(bytes, 0, len);
                }
            }
            fos.close();
        } catch (MalformedURLException e) {
            e.printStackTrace();
            re = false;
            return re;
        } catch (IOException e) {
            e.printStackTrace();
            re = false;
            return re;
        } finally {

            try {
                connection.disconnect();
                inputStream.close();

            } catch (IOException e) {
                e.printStackTrace();
            }

        }
        return re;
    }
}