java中base64

// 将 s 进行 BASE64 编码
public static String getBASE64(String s) {
if (s == null) return null;
return (new sun.misc.BASE64Encoder()).encode( s.getBytes() );
}

// 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;
}
}

或者apache的包

 

import java.io.UnsupportedEncodingException;

import org.apache.commons.codec.binary.Base64;
public class Base64Util {


    /**
     * 将二进制数据编码为BASE64字符串
     * @param binaryData
     * @return
     */
    public static String encode( byte [] binaryData) {
        try {
            return new String(Base64.encodeBase64(binaryData), "UTF-8" );
        } catch (UnsupportedEncodingException e) {
            return null ;
        }
    }

    /**
     * 将BASE64字符串恢复为二进制数据
     * @param base64String
     * @return
     */
    public static byte [] decode(String base64String) {
        try {
            return Base64.decodeBase64(base64String.getBytes( "UTF-8" ));
        } catch (UnsupportedEncodingException e) {
            return null ;
        }
    }

}