代码如下

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import java.util.Base64;

public class Base64Tools {

    final static Base64.Decoder decoder = Base64.getDecoder();
    final static Base64.Encoder encoder = Base64.getEncoder();

    public static void main(String[] args) {

        // Base64编码
        String encodeText = encode("Hello World");
        System.out.println(encodeText);

        // Base64解码
        String decodeText = decode(encodeText);
        System.out.println(decodeText);
    }

    /**
     * Java8中的Base64编码
     *
     * @param str
     * @return
     */
    public static String encode(String str) {
        try {
            return encoder.encodeToString(str.getBytes("UTF-8"));
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    /**
     * Java8中的Base64解码
     *
     * @param str
     * @return
     */
    public static String decode(String str) {
        byte[] result = decoder.decode(str.getBytes());
        return new String(result);
    }
}