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  • java base64转文件

        /**
         * 把base64转化为文件.
         *
         * @param base64   base64
         * @param filePath 目标文件路径
         * @return boolean isTrue
         */
        public static Boolean decryptByBase64(String base64, String filePath) {
    
            if (Strings.isNullOrEmpty(base64) && Strings.isNullOrEmpty(filePath)) {
                return Boolean.FALSE;
            }
            try {
                Files.write(Paths.get(filePath),
                        Base64.decodeBase64(base64.substring(base64.indexOf(",") + 1)), StandardOpenOption.CREATE);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return Boolean.TRUE;
        }
    
        /**
         * 把文件转化为base64.
         *
         * @param filePath 源文件路径
         * @return String 转化后的base64
         */
        public static String encryptToBase64(String filePath) {
            if (!Strings.isNullOrEmpty(filePath)) {
                try {
                    byte[] bytes = Files.readAllBytes(Paths.get(filePath));
                    return Base64.encodeBase64String(bytes);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return null;
        }
    

    代码解释

    Files.write(Paths.get(filePath),Base64.decodeBase64(base64.substring(base64.indexOf(",") + 1)), StandardOpenOption.CREATE);
    

    这段代码中 base64.substring(base64.indexOf(",") + 1) 是截取前台传递过来的base64中带的文件标识

    data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDABALDA4MChAODQ4SERATGCgaGYWGDEjJR0o......
    

    base64.substring(base64.indexOf(",") + 1) 执行后

     /9j/4AAQSkZJRgABAQAAAQABAAD/2wBDABALDA4MChAODQ4SERATGCgaGYWGDEjJR0o......
    

    同样java 中 Base64.encodeBase64String(bytes) 执行结束后 base64 不携带文件标识

    转载 https://www.jianshu.com/p/2becba13d9cf

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  • 原文地址:https://www.cnblogs.com/sunBinary/p/11725255.html
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