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        <meta property="og:description" content="注意事项：  标准base64是一种编码转换，不是加密方法，过程可逆； 标准base64的64个可打印字符由52个大小写英文字母和10个数字（0-9）以及 / 和 + 组成； base64为了方便把含" />
        
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                  				  				  				<div id="content_views" class="htmledit_views"> <p>注意事项：</p> <ul> <li>标准base64是一种编码转换，不是加密方法，过程可逆；</li> <li>标准base64的64个可打印字符由52个大小写英文字母和10个数字（0-9）以及 / 和 + 组成；</li> <li>base64为了方便把含有不可见字符串的信息用可见字符串表示出来；</li> </ul> <p>代码如下：</p> <div class="has"> <pre class="has"><code>import</code></pre> </div> <p>运行结果：</p> <div class="has"> <pre class="has"><code>编码后</code></pre> </div> <p><b>java8可以直接使用Base64，转换原理如下：</b></p> <ol> <li>将二进制数据每三个字节分为一组，每个字节占8bit，那么共有24个二进制位。</li> <li>将上面的24个二进制位每6个一组，共分为4组。</li> <li>在每组前添加2个0，每组由6个变为8个二进制位，总共32个二进制位，也就是四个字节。</li> <li>根据base64编码对照表将每个字节转化成对应的可打印字符</li> </ol> <p>转化实例如下图：</p> <div style="text-align:center;"><img decoding="async" src="http://img.555519.xyz/uploads3/20220609/d9b8279da23413cf47c4cd1175a3b962.jpg" alt="springboot base64_base64转码"></div> <p>标准base64的64个可打印字符由52个大小写英文字母和10个数字（0-9）以及 / 和 + 组成，编码对照表如下：</p> <div style="text-align:center;"><img decoding="async" src="http://img.555519.xyz/uploads3/20220609/d7789c7473990d03704077e2b2fc949e.jpg" alt="springboot base64_base64转码"></div> <p>base64是将二进制每三个字节转为4个字节，会有不足三个字节的情况，处理如下：</p> <ol> <li>两个字节：两个字节共16个二进制位，依旧按照规则进行分组。此时总共16个二进制位，每6个一组，则第三组缺少2位，用0补齐，得到三个Base64编码，第四组完全没有数据则用“=”补上。因此，如下图中“BC”转换之后为“QKM=”；</li> <li>一个字节：一个字节共8个二进制位，依旧按照规则进行分组。此时共8个二进制位，每6个一组，则第二组缺少4位，用0补齐，得到两个Base64编码，而后面两组没有对应数据，都用“=”补上。因此，如下图中“A”转换之后为“QQ==”</li> </ol> <div style="text-align:center;"><img decoding="async" src="http://img.555519.xyz/uploads3/20220609/e7e82c873bae4eef3a752a9925d550da.jpg" alt="springboot base64_base64转码"></div> <p>参考连接：base64编码 - 豁然高 - 博客园</p> </div> 			                <div class="clearfix"></div>
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