1. 加密目标文件

2. 代码如下

package com.xgt.util;import java.io.*;public class VideoEncodeUtil {    public static void main(String[] args) throws Exception {        encrypt("D:\\py交易\\11.mp4","fuckyourself");        decrypt("D:\\py交易\\11.mp4","D:\\py交易\\22.mp4",4);        System.out.println(readFileLastByte("D:\\py交易\\11.mp4",12));    }    /**     * 文件file进行加密     * @param fileUrl 文件路径     * @param key 密码     * @throws Exception     */    public static void encrypt(String fileUrl, String key) throws Exception {        File file = new File(fileUrl);        String path = file.getPath();        if(!file.exists()){            return;        }        int index = path.lastIndexOf("\\");        String destFile = path.substring(0, index)+"\\"+"abc";        File dest = new File(destFile);        //获取待加密文件的输入流        InputStream in = new FileInputStream(fileUrl);        //创建中转文件输出流        OutputStream out = new FileOutputStream(destFile);        //待加密文件的流        byte[] buffer = new byte[1024];        int r;        //加密之后的文件的流        byte[] buffer2=new byte[1024];        while (( r= in.read(buffer)) > 0) {            for(int i=0;i
   
    >10);        int count = mod==0?div:(div+1);        int k = 1, r;        while ((k <= count && ( r = is.read(buffer)) > 0)) {            if(mod != 0 && k==count) {                r = mod;            }            for(int i = 0;i < r;i++)            {                byte b=buffer[i];                //buffer2[i]=b==0?bMax:--b;                //每个字节减2解码                b-=2;                buffer2[i] = b;            }            out.write(buffer2, 0, r);            k++;        }        out.close();        is.close();        return tempUrl;    }    /**     * 判断文件是否加密     * @param fileName     * @return     *     * 加密成功返回key     * 加密失败返回非key的字符串     */    public static String readFileLastByte(String fileName, int keyLength) {        File file = new File(fileName);        if(!file.exists())return "没有文件";        StringBuffer str = new StringBuffer();        try {            // 打开一个随机访问文件流，按读写方式            RandomAccessFile randomFile = new RandomAccessFile(fileName, "rw");            // 文件长度，字节数            long fileLength = randomFile.length();            //将写文件指针移到文件尾。            for(int i = keyLength ; i>=1 ; i--){                randomFile.seek(fileLength-i);                str.append((char)randomFile.read());            }            randomFile.close();            return str.toString();        } catch (IOException e) {            e.printStackTrace();        }        return "异常";    }}

3. 加密和解密接口

/**     * 加密视频     * @param fileName     */    public void encryptVideo(String fileName){        try {            File file = new File(fileUrl);            FileToolUtil.judeDirExists(file);            /**             * 加密不可进行多次             * 判断是否有加密，加密过无需在加密            */            if(!VideoEncodeUtil.readFileLastByte(fileUrl+"\\"+fileName,key.length()).equals(key)) {                VideoEncodeUtil.encrypt(fileUrl + "\\" + fileName, key);            }        } catch (Exception e) {            e.printStackTrace();        }    }    /**     * 解密视频     * @param fileName     */    public String decryptVideo(String fileName) throws Exception {            File file = new File(SystemConstant.VIDEO_TEMP_PATH);            FileToolUtil.judeDirExists(file);            return VideoEncodeUtil.decrypt(SAFETY_EDU_LOCAL_PATH +  fileName,                    SystemConstant.VIDEO_TEMP_PATH +  fileName,                    SystemConstant.VIDEO_ENCRYPT_DECRYPT_KEY.length());    }

4. 播放加密视频方法（播放解密后的流）：

/**     * 播放加密MP4     * @param response     * @throws IOException     */    @RequestMapping("/playMp4")    @ResponseBody    public void playMp4(HttpServletResponse response,String fileName) throws Exception {        // TODO 测试联调结束后需删除        fileName = "edu/video/6689AC1A506133C13FDA593135E2D923.mp4";        String tempFilePath = SystemConstant.VIDEO_TEMP_PATH +  fileName;        try {            tempFilePath = videoMaterialService.decryptVideo(fileName);            // 解密过后的临时文件路径            FileInputStream inputStream = new FileInputStream(tempFilePath);            byte[] data = FileToolUtil.inputStreamToByte(inputStream);            String diskfilename = "final.mp4";            response.setContentType("video/mp4");            response.setHeader("Content-Disposition", "attachment; filename=\"" + diskfilename + "\"" );            System.out.println("data.length " + data.length);            response.setContentLength(data.length);            response.setHeader("Content-Range", "" + Integer.valueOf(data.length-1));            response.setHeader("Accept-Ranges", "bytes");            response.setHeader("Etag", "W/\"9767057-1323779115364\"");            OutputStream os = response.getOutputStream();            os.write(data);            //先声明的流后关掉！            os.flush();            os.close();            inputStream.close();        }catch (Exception e){            logger.error("....", e);        }finally {            VideoMaterialService.deleteVideoFile(tempFilePath);        }    }