Java 视频流分段返回

package com.example.demo.controller;

import ch.qos.logback.core.net.SyslogOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.io.RandomAccessFile;

/**
 * Description: videoTest
 *
 * @author 
 * @CalssName: videoController
 * @Email 
 * @date 2021/6/29 15:06
 */
@RestController
public class videoController {
    @GetMapping("video")
    public void play(HttpServletRequest request, HttpServletResponse response) throws IOException {
        response.reset();
        File file = new File("F:\\test\\pyjwt_test\\1.mp4");
        long fileLength = file.length();
        // 随机读文件
        RandomAccessFile randomAccessFile = new RandomAccessFile(file, "r");

        //获取从那个字节开始读取文件
        String rangeString = request.getHeader("Range");
        System.out.println(rangeString);
        long range=0;
        if (rangeString!=null) {
            range = Long.valueOf(rangeString.substring(rangeString.indexOf("=") + 1, rangeString.indexOf("-")));
        }
        //获取响应的输出流
        OutputStream outputStream = response.getOutputStream();
        //设置内容类型
        response.setHeader("Content-Type", "video/mp4");
        //返回码需要为206，代表只处理了部分请求，响应了部分数据
        response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT);

        // 移动访问指针到指定位置
        randomAccessFile.seek(range);
        // 每次请求只返回1MB的视频流
        byte[] bytes = new byte[1024 * 1024];
        int len = randomAccessFile.read(bytes);
        //设置此次相应返回的数据长度
        response.setContentLength(len);
        //设置此次相应返回的数据范围
        response.setHeader("Content-Range", "bytes "+range+"-"+(fileLength-1)+"/"+fileLength);
        // 将这1MB的视频流响应给客户端
        outputStream.write(bytes, 0, len);
        outputStream.close();
        randomAccessFile.close();

        System.out.println("返回数据区间:【"+range+"-"+(range+len)+"】");
    }
}