[Java知识库]java把base64位编码转为File文件并存到本地

@RequestMapping(value = "/api/faceData/uploadFileTest", produces = "application/json;charset=UTF-8", method = {RequestMethod.POST})
    @ResponseBody
    public Map<String, Object> savePic(@RequestBody JSONObject params) throws Exception {

        String base64Pic = "";
        Map<String, Object> resultMap = new HashMap<String, Object>();
        base64Pic = params.getString("file_base64");
        if (base64Pic == null) { // 图像数据为空
            resultMap.put("resultCode", 0);
            resultMap.put("msg", "图片为空");
        } else {
            BASE64Decoder decoder = new BASE64Decoder();
            String baseValue = base64Pic.replaceAll(" ", "+");//前台在用Ajax传base64值的时候会把base64中的+换成空格，所以需要替换回来。
            byte[] b = decoder.decodeBuffer(baseValue.replace("data:image/jpeg;base64,", ""));//去除base64中无用的部分
            base64Pic = base64Pic.replace("base64,", "");
            System.out.println(b);
            String imgFilePath = "C:\\Users\\ron\\Desktop\\2.jpg";
            try {
                for (int i = 0; i < b.length; ++i) {
                    if (b[i] < 0) {// 调整异常数据
                        b[i] += 256;
                    }
                }
                // 生成jpeg图片
                File file = new File(imgFilePath);
                // 如果要返回file文件这边return就可以了
                System.err.println("file.getName = " + file.getName());
                System.err.println("file.getPath = " + file.getPath());
                OutputStream out = new FileOutputStream(file.getPath());
                out.write(b);
                out.flush();
                out.close();
                resultMap.put("resultCode", 1);
                resultMap.put("msg", "存储成功");
            } catch (Exception e) {
                resultMap.put("resultCode", 0);
                resultMap.put("msg", "存储异常");
            }

        }
        return resultMap;
    }