Java后台接收二进制流和Base64数据保存图片

Java后台接收二进制流和Base64数据保存图片

Java后台用的是Springmvc框架，接收前台传过来的二进制流数据或者是base64的字符串图片数据。

接收二进制流数据：

@RequestMapping("/uploadImg")
@ResponseBody
public Object uploadImg(HttpServletRequest request, HttpServletResponse response) throws IOException {
    System.out.println("图片上传开始...");
    String destDir = "/upload/image";

    /* response.setHeader("Access-Control-Allow-Origin", "*");
     response.setHeader("Access-Control-Allow-Methods", "POST");*/

    ServletInputStream inputStream = request.getInputStream();

    //获取文件上传的真实路径
    String uploadPath = request.getSession().getServletContext().getRealPath("/");
    //保存文件的路径
    String filepath = destDir + File.separator + createNewDir();
    File destfile = new File(uploadPath + filepath);
    if (!destfile.exists()) {
        destfile.mkdirs();
    }
    //文件新名称
    String fileNameNew = getFileNameNew() + ".png";
    File f = new File(destfile.getAbsoluteFile() + File.separator + fileNameNew);
    if (!f.exists()) {
        OutputStream os = new FileOutputStream(f);
        BufferedOutputStream bos = new BufferedOutputStream(os);

        byte[] buf = new byte[1024];
        int length;
        length = inputStream.read(buf, 0, buf.length);

        while (length != -1) {
            bos.write(buf, 0, length);
            length = inputStream.read(buf);
        }
        bos.close();
        os.close();
        inputStream.close();
        String lastpath = filepath + File.separator + fileNameNew;
        System.out.println("返回图片路径：" + lastpath);       
        return lastpath;
    }
    return false;
}

接收base64的字符串数据：

/**
 * 将接收的base64转换成图片保存
 *
 * @param imgByte
 *            base64数据
 * @param cardNum
 *            号码
 * @return 成功返回图片保存路径，失败返回false
 */
@RequestMapping("/saveToImgByStr")
@ResponseBody
public Object saveToImgByStr(String imgByte,String cardNum,HttpServletRequest request,HttpServletResponse response) {
    String destDir = "/upload/image";
    /* response.setHeader("Access-Control-Allow-Origin", "*");
     response.setHeader("Access-Control-Allow-Methods", "POST");*/
    imgByte=imgByte.replaceAll("data:image/png;base64,","");
    BASE64Decoder decoder =  new BASE64Decoder();
    byte[] imageByte = null;
    try{
        imageByte = decoder.decodeBuffer(imgByte);
        for (int i = 0; i < imageByte.length; ++i) {
            if (imageByte[i] < 0) {// 调整异常数据
                imageByte[i] += 256;
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    if (imageByte.length>0) {
        try {
            //获取文件上传的真实路径
            String uploadPath = request.getSession().getServletContext().getRealPath("/");
            //保存文件的路径
            String filepath = destDir + File.separator + createNewDir();
            File destfile = new File(uploadPath + filepath);
            if (!destfile.exists()) {
                destfile.mkdirs();
            }
            //文件新名称
            String fileNameNew = getFileNameNew() + ".png";
            File f = new File(destfile.getAbsoluteFile() + File.separator + fileNameNew);
            // 将字符串转换成二进制，用于显示图片
            // 将上面生成的图片格式字符串 imgStr，还原成图片显示
            InputStream in = new ByteArrayInputStream(imageByte);
            FileOutputStream fos = new FileOutputStream(f);
           // BufferedOutputStream bos = new BufferedOutputStream(fos);
            byte[] buf = new byte[1024];
            int length;
            length = in.read(buf, 0, buf.length);

            while (length != -1) {
                fos.write(buf,0,length);
                length = in.read(buf);
            }
            fos.flush();
            fos.close();
            in.close();
            String lastpath = filepath + File.separator + fileNameNew;
            System.out.println("返回图片路径：" + lastpath);  
            return lastpath;

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
        }
    }
    return false;
}

util方法：

/**
 * 为文件重新命名，命名规则为当前系统时间毫秒数
 *
 * @return string
 */
private static String getFileNameNew() {
    SimpleDateFormat fmt = new SimpleDateFormat("yyyyMMddHHmmssSSS");
    return fmt.format(new Date());
}

/**
 * 以当前日期为名，创建新文件夹
 *
 * @return
 */
private static String createNewDir() {
    SimpleDateFormat fmt = new SimpleDateFormat("yyyyMMdd");
    return fmt.format(new Date());
}