通过String字符生成base64编码在生成图片

     * base64转图片        //对字节数组字符串进行Base64解码并生成图片
     * @param base64str base64码
     * @return 

    // @param savePath 图片路径
    private static final String savePath="image_ver\\verifyCode";

判断是否为base64编码

    public static void mainDDD(String[] args) throws JsonProcessingException {
        String base64Pattern = "^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{4}|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)$";
        if (stringBase64.lastIndexOf(",") != -1) {
            stringBase64= stringBase64.substring(stringBase64.lastIndexOf(",") + 1);
        }
        Boolean isLegal = stringBase64.matches(base64Pattern);
        if (!isLegal) {
            System.out.println("输入的不是Base64编码的字符串。");
        }
        return;
    }

生成base64编码，处理字符串            //Base64解码

判断base63str是否为空 

    private  static boolean ifBase64NotNull(String base64str){
        if (base64str == null) {
            return false;
        }
        System.out.println(true);
        return true;
    }

BASE64Decoder decoder = new BASE64Decoder();
log.info(decoder);
//开始解码
byte[] b = decoder.decodeBuffer(base64str); 

    public static boolean GenerateImage(String base64str) throws IOException {
        ifBase64NotNull(base64str);
        BASE64Decoder decoder = new BASE64Decoder();
        byte[] b = decoder.decodeBuffer(base64str);
        for (int i = 0; i < b.length; ++i) {  //调整异常数据
            if (b[i] < 0) {
                b[i] += 256;
            }
        }
        outFileStream(b);
        return true;
    }

生成图片

    public static void outFileStream(byte[] b) throws IOException {
        //生成jpeg图片
        String date = "MMdd-HH：mm：ss";
        SimpleDateFormat time = new SimpleDateFormat(date);
        Date data = new Date();
        String timeName=time.format(data);
        String filename = savePath + timeName + ".png";
        OutputStream out = Files.newOutputStream(Paths.get(filename));
        out.write(b);
        out.flush();
        out.close();
    }