tech.mhuang.ext.interchan.payment.wechat.util.PayCommonUtil Maven / Gradle / Ivy
package tech.mhuang.ext.interchan.payment.wechat.util;
import java.util.Iterator;
import java.util.Map;
import java.util.Random;
import java.util.Set;
import java.util.SortedMap;
public class PayCommonUtil {
/**
* 是否签名正确,规则是:按参数名称a-z排序,遇到空值的参数不参加签名。
*
* @param characterEncoding 验证签名的编码
* @param packageParams 验证param
* @param API_KEY API_KEY
* @return boolean
*/
@SuppressWarnings({"rawtypes"})
public static boolean isTenpaySign(String characterEncoding, SortedMap packageParams, String API_KEY) {
StringBuffer sb = new StringBuffer();
Set es = packageParams.entrySet();
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
if (!"sign".equals(k) && null != v && !"".equals(v)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key=" + API_KEY);
//算出摘要
String mysign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toLowerCase();
String tenpaySign = ((String) packageParams.get("sign")).toLowerCase();
return tenpaySign.equals(mysign);
}
private final static String CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
public static String CreateNoncestr() {
StringBuilder res = new StringBuilder();
for (int i = 0; i < 16; i++) {
Random rd = new Random();
res.append(CHARS.charAt(rd.nextInt(CHARS.length() - 1)));
}
return res.toString();
}
/**
* sign签名
*
* @param characterEncoding 签名的编码
* @param packageParams 签名的map
* @param API_KEY 签名需要的key
* @return String
*/
@SuppressWarnings({"rawtypes"})
public static String createSign(String characterEncoding, SortedMap packageParams, String API_KEY) {
StringBuffer sb = new StringBuffer();
Set es = packageParams.entrySet();
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key=" + API_KEY);
String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
return sign;
}
/**
* 将请求参数转换为xml格式的string
*
* @param parameters 参数
* @return String
*/
@SuppressWarnings({"rawtypes"})
public static String getRequestXml(SortedMap parameters) {
StringBuffer sb = new StringBuffer();
sb.append("");
Set es = parameters.entrySet();
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
if ("attach".equalsIgnoreCase(k) || "body".equalsIgnoreCase(k) || "sign".equalsIgnoreCase(k)) {
sb.append("<" + k + ">" + "");
} else {
sb.append("<" + k + ">" + v + "");
}
}
sb.append(" ");
return sb.toString();
}
/**
* 取出一个指定长度大小的随机正整数.
*
* @param length 长度
* @return int
*/
public static int buildRandom(int length) {
int num = 1;
double random = Math.random();
if (random < 0.1) {
random = random + 0.1;
}
for (int i = 0; i < length; i++) {
num = num * 10;
}
return (int) ((random * num));
}
}