package com.gk.firework.Domain.Utils;
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import java.util.Map;
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import java.util.Random;
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import java.util.TreeMap;
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import static com.gk.firework.Domain.Utils.StringUtils.MD5Encoder;
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public class SignUtils {
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public static String getTimestamp() {
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//生成时间戳
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long timestampLong =System.currentTimeMillis();
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String timestampStr = String.valueOf(timestampLong);
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return timestampStr;
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}
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public static String getNonceStr(int length){
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//生成随机字符串
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String str="zxcvbnmlkjhgfdsaqwertyuiopQWERTYUIOPASDFGHJKLZXCVBNM1234567890";
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Random random=new Random();
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StringBuffer randomStr=new StringBuffer();
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// 设置生成字符串的长度，用于循环
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for(int i=0; i<length; ++i){
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//从62个的数字或字母中选择
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int number=random.nextInt(62);
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//将产生的数字通过length次承载到sb中
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randomStr.append(str.charAt(number));
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}
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//将承载的字符转换成字符串
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return randomStr.toString();
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}
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//类似微信接口的签名生成方法
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public static String createSign(Map<String, String> params, String privateKey){
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StringBuilder sb = new StringBuilder();
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// 将参数以参数名的字典升序排序
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Map<String, String> sortParams = new TreeMap<String, String>(params);
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// 遍历排序的字典,并拼接"key=value"格式
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for (Map.Entry<String, String> entry : sortParams.entrySet()) {
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String key = entry.getKey();
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String value = entry.getValue().trim();
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if (!StringUtils.isEmpty(value))
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sb.append("&").append(key).append("=").append(value);
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}
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String stringA = sb.toString().replaceFirst("&","");
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String stringSignTemp = stringA + "&"+"appkey="+privateKey;
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//将签名使用MD5加密并全部字母变为大写
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String signValue = MD5Encoder(stringSignTemp,"utf-8").toUpperCase();
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System.out.println("stringA+privateKey后MD5加密+转换全部大写生成sign为： "+signValue);
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return signValue;
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}
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}
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