Basic64 编码解码

import sun.misc.BASE64Decoder;   

public class Base64 {  

    /**
     * 字符串转Base64编码
     * @param s
     * @return
     */
    public static String getBASE64(String s) {
    if (s == null) return null;
    return (new sun.misc.BASE64Encoder()).encode( s.getBytes() );
    }
    /**
     * 将 字符数组 进行 BASE64 编码
     * @param s
     * @return
     */
    public static String getBASE64Byte(byte[] s){
        if (s == null) return null;
        return (new sun.misc.BASE64Encoder()).encode(s);
    }  

    // 将 BASE64 编码的字符串 s 进行解码
    public static String getFromBASE64(String s) {
    if (s == null) return null;
    BASE64Decoder decoder = new BASE64Decoder();
    try {
    byte[] b = decoder.decodeBuffer(s);
    return new String(b);
    } catch (Exception e) {
    return null;
    }
    }
    public static void main(String[] args) {
        //String str = "123456";
        String str = "21b51cdb887c2d5a0e09e8c3187a18de66285bd316bcf36b6d43da152abfe91666f396068fac9efbd6bfac3f9e7d4745695b2e7bda02a2b04fb6790965eb65be568b6d3428f850ee9f648dc7cf1d97a73905dd584857194f0d8f9d2354bb9c938d6a9548d0220c03795d8070a9668700e9afcf7dd9ab2f8d7d757512358ab2ac";
        System.out.println(Base64.getBASE64(str));
        System.out.println(Base64.getFromBASE64(Base64.getBASE64(str)));
    }
}