字典排序MD5生成代码

/*
 * Project: payment.framework
 *
 * File Created at 2017年12月23日
 *
 * Copyright 2016 CMCC Corporation Limited.
 * All rights reserved.
 *
 * This software is the confidential and proprietary information of
 * ZYHY Company. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license.
 */
package com.cmcc.hybj.payment.framework.https;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Comparator;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Set;
import java.util.TreeSet;

/**
 * @author gy
 * @Type Sign.java
 * @Desc 支付签名
 * @date 2017年12月23日 上午9:56:04
 */
public class Sign {
    private static Logger log = LoggerFactory.getLogger(Sign.class);

/**
     * // 服务器端生成签名
     *
     * @param map
     * @return
     */
    public static String buildSign(Hashtable<String, String> map) {
        Set<String> keys = new TreeSet<String>(new MyComparator());
        Enumeration<String> enumeration = map.keys();
        while (enumeration.hasMoreElements()) {
            String keyss = enumeration.nextElement();
            keys.add(keyss);
        }
        // 拼接有序的参数名-值串
        StringBuilder stringBuilder = new StringBuilder();
        for (String key : keys) {
            String value = map.get(key);
            if (value == null) {
                continue;
            } else if ("".equals(value.trim())) {
                continue;
            } else if ("sign".equals(key.trim())) {
                continue;
            } else {
                stringBuilder.append(key).append("=").append(value).append("&");
            }
        }
        String s = stringBuilder.toString();
        s = s.substring(0, s.length() - 1);
        log.info("排序后的参数 ：" + s);
        return s;
    }

/**
     * 内部类
     *
     * @author gy
     */
    public static class MyComparator implements Comparator<String> {

@Override
        public int compare(String o1, String o2) {

return o1.compareTo(o2);// 升序排列
        }

}
}

/**
 * Revision history
 * -------------------------------------------------------------------------
 * <p>
 * Date Author Note
 * -------------------------------------------------------------------------
 * 2017年12月23日 Administrator creat
 */