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)));  
    }  
}