简易的字段隐藏工具，用于选择性地对原值做全部、部分加密/解密; 用于一些页面展示/表单提交的信息展示场景

ValueHidingUtil.java

package test;

import java.nio.charset.Charset;

import org.apache.commons.codec.binary.Base64;
import org.springframework.security.crypto.encrypt.BytesEncryptor;
import org.springframework.security.crypto.encrypt.Encryptors;

/**
 * 简易的字段隐藏工具，用于选择性地对原值做全部、部分加密/解密; 用于一些页面展示/表单提交的信息展示场景
 * @author pf-miles Mar 31, 2016 4:27:53 PM
 */
public class ValueHidingUtil {
    private static final String         commonPass    = "`],9,cFPEO(\"WU2b";
    private static final String         commonSalt    = "2e461d09b7c3ad3f";
    private static final Charset        charset       = Charset.forName("UTF-8");

    private static final BytesEncryptor be            = Encryptors.standard(commonPass, commonSalt);
    /**
     *  做了信息隐藏的值的特征前缀
     */
    public static final String          VAL_HIDE_PREF = "_v_h_";

    /**
     * 加密
     */
    private static String encrypt(String text) {
        byte[] enc = be.encrypt(text.getBytes(charset));
        return Base64.encodeBase64String(enc);
    }

    /**
     * 解密
     */
    private static String decrypt(String cipher) {
        byte[] enc = Base64.decodeBase64(cipher);
        return new String(be.decrypt(enc), charset);
    }

    /**
     * 对输入值做信息隐藏加密
     */
    public static String valHideEncrypt(String val) {
        if (val != null && !val.startsWith(VAL_HIDE_PREF)) {
            return VAL_HIDE_PREF + ValueHidingUtil.encrypt(val);
        } else {
            return val;
        }
    }

    /**
     * 对被隐藏的密文做解密
     */
    public static String valHideDecrypt(String cipher) {
        if (cipher != null && cipher.startsWith(VAL_HIDE_PREF)) {
            return ValueHidingUtil.decrypt(cipher.substring(VAL_HIDE_PREF.length()));
        } else {
            return cipher;
        }
    }

}