Java后台接收二进制流和Base64数据

2023-10-14 09:22| 来源: 网络整理| 查看: 265

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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()); }

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