java base64编码和解码

通过反射使用java 中不对外公开的类：

 

/*** 
     * encode by Base64 
     */  
    public static String encodeBase64(byte[]input) throws Exception{  
        Class clazz=Class.forName("com.sun.org.apache.xerces.internal.impl.dv.util.Base64");  
        Method mainMethod= clazz.getMethod("encode", byte[].class);  
        mainMethod.setAccessible(true);  
         Object retObj=mainMethod.invoke(null, new Object[]{input});  
         return (String)retObj;  
    }  
    /*** 
     * decode by Base64 
     */  
    public static byte[] decodeBase64(String input) throws Exception{  
        Class clazz=Class.forName("com.sun.org.apache.xerces.internal.impl.dv.util.Base64");  
        Method mainMethod= clazz.getMethod("decode", String.class);  
        mainMethod.setAccessible(true);  
         Object retObj=mainMethod.invoke(null, input);  
         return (byte[])retObj;  
    }