PaymentKit.java
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package com.jfinal.weixin.sdk.kit;
import com.jfinal.kit.HashKit;
import com.jfinal.kit.StrKit;
import com.jfinal.weixin.sdk.utils.Charsets;
import com.jfinal.weixin.sdk.utils.XmlHelper;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;
/**
* 微信支付的统一下单工具类
* @author L.cm
*/
public class PaymentKit {
/**
* 组装签名的字段
* @param params 参数
* @param urlEncoder 是否urlEncoder
* @return String
*/
public static String packageSign(Map<String, String> params, boolean urlEncoder) {
// 先将参数以其参数名的字典序升序进行排序
TreeMap<String, String> sortedParams = new TreeMap<String, String>(params);
// 遍历排序后的字典，将所有参数按"key=value"格式拼接在一起
StringBuilder sb = new StringBuilder();
boolean first = true;
for (Entry<String, String> param : sortedParams.entrySet()) {
String value = param.getValue();
if (StrKit.isBlank(value)) {
continue;
}
if (first) {
first = false;
} else {
sb.append("&");
}
sb.append(param.getKey()).append("=");
if (urlEncoder) {
try { value = urlEncode(value); } catch (UnsupportedEncodingException e) {}
}
sb.append(value);
}
return sb.toString();
}
/**
* urlEncode
* @param src 微信参数
* @return String
* @throws UnsupportedEncodingException 编码错误
*/
public static String urlEncode(String src) throws UnsupportedEncodingException {
return URLEncoder.encode(src, Charsets.UTF_8.name()).replace("+", "%20");
}
/**
* 生成签名
* @param params 参数
* @param paternerKey 支付密钥
* @return sign
*/
public static String createSign(Map<String, String> params, String paternerKey) {
// 生成签名前先去除sign
params.remove("sign");
String stringA = packageSign(params, false);
String stringSignTemp = stringA + "&key=" + paternerKey;
return HashKit.md5(stringSignTemp).toUpperCase();
}
/**
* 支付异步通知时校验sign
* @param params 参数
* @param paternerKey 支付密钥
* @return {boolean}
*/
public static boolean verifyNotify(Map<String, String> params, String paternerKey){
String sign = params.get("sign");
String localSign = PaymentKit.createSign(params, paternerKey);
return sign.equals(localSign);
}
/**
* 微信下单，map to xml
* @param params 参数
* @return String
*/
public static String toXml(Map<String, String> params) {
StringBuilder xml = new StringBuilder();
xml.append("<xml>");
for (Entry<String, String> entry : params.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
// 略过空值
if (StrKit.isBlank(value)) continue;
xml.append("<").append(key).append(">");
xml.append(entry.getValue());
xml.append("</").append(key).append(">");
}
xml.append("</xml>");
return xml.toString();
}
/**
* 针对支付的xml，没有嵌套节点的简单处理
* @param xmlStr xml字符串
* @return map集合
*/
public static Map<String, String> xmlToMap(String xmlStr) {
XmlHelper xmlHelper = XmlHelper.of(xmlStr);
return xmlHelper.toMap();
}
}