微信支付工具类
WechatPayXmlUtil
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import org.w3c.dom.Document;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
/**
* 2018/7/3
*/
public final class WechatPayXmlUtil {
public static DocumentBuilder newDocumentBuilder() throws ParserConfigurationException {
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
documentBuilderFactory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
documentBuilderFactory.setFeature("http://xml.org/sax/features/external-general-entities", false);
documentBuilderFactory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
documentBuilderFactory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
documentBuilderFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
documentBuilderFactory.setXIncludeAware(false);
documentBuilderFactory.setExpandEntityReferences(false);
return documentBuilderFactory.newDocumentBuilder();
}
public static Document newDocument() throws ParserConfigurationException {
return newDocumentBuilder().newDocument();
}
}
WechatPayUtil
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import com.kgc.scd.constant.WechatPayConstant;
import lombok.extern.slf4j.Slf4j;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.StringWriter;
import java.security.MessageDigest;
import java.security.SecureRandom;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.*;
/**
* Created On : 3/11/2022.
* <p>
* Author : huayu
* <p>
* Description: WechatPayUtil
*/
@Slf4j
public class WechatPayUtil {
//随机字符库
private static final String SYMBOLS = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
//随机字符对象
private static final Random RANDOM = new SecureRandom();
/**
* @author : huayu
* @date : 3/11/2022
* @param : []
* @return : java.lang.String
* @description : 获取随机字符串 Nonce Str 支持指定长度
*
*/
public static String generateNonceStr(int length) {
//限制随机字符串的长度
if(length < 6 || length> 32){
length = 32;
}
//根据指定的长度生成随机字符串
char[] nonceChars = new char[length];
for (int index = 0; index < nonceChars.length; ++index) {
nonceChars[index] = SYMBOLS.charAt(RANDOM.nextInt(SYMBOLS.length()));
}
return new String(nonceChars);
}
/**
* @author : huayu
* @date : 3/11/2022
* @param : []
* @return : java.lang.String
* @description : 获取随机字符串 Nonce Str 固定长度32
*
*/
public static String generateNonceStr() {
return generateNonceStr(32);
}
/**
* @author : huayu
* @date : 3/11/2022
* @param : []
* @return : java.lang.String
* @description : 获取随机字符串 Nonce Str 使用UUID
*
*/
public static String generateNonceStrUUID(int length) {
return (length < 6 || length> 32)
? UUID.randomUUID().toString().replace("-","").substring(0,32)
: generateNonceStr(32);
}
/**
* @author : zhukang
* @date : 2022/11/3
* @param : []
* @return : java.lang.String
* @description : 生成内部订单号，要求32个字符内（最少6个字符），只能是数字、大小写字母
*/
public static String generateTradeOrderNo(){
// 系统内订单号规则：统一头标识 + 时间戳 + 随机序号
return new StringBuilder(WechatPayConstant.WECHAT_PAY_TRADE_ORDER_PREFIX )
.append(LocalDateTime.now().format(DateTimeFormatter.ofPattern(WechatPayConstant.WECHAT_PAY_TIME_PATTERN_ALL)))
.append(generateNonceStr(6)).toString();
}
/**
* 生成签名
*
* @param data 待签名数据
* @param key API密钥
* @return 签名
*/
public static String generateSignature(final Map<String, String> data, String key) throws Exception {
return generateSignature(data, key, WechatPayConstant.WECHAT_PAY_SIGN_TYPE_MD5);
}
/**
* 生成签名. 注意，若含有sign_type字段，必须和signType参数保持一致。
*
* @param data 待签名数据
* @param key API密钥
* @param signType 签名方式
* @return 签名
*/
public static String generateSignature(final Map<String, String> data, String key, String signType) throws Exception {
Set<String> keySet = data.keySet();
String[] keyArray = keySet.toArray(new String[keySet.size()]);
Arrays.sort(keyArray);
StringBuilder sb = new StringBuilder();
for (String k : keyArray) {
if (k.equals(WechatPayConstant.WECHAT_PAY_FIELD_SIGN)) {
continue;
}
if (data.get(k).trim().length() > 0) // 参数值为空，则不参与签名
sb.append(k).append("=").append(data.get(k).trim()).append("&");
}
sb.append("key=").append(key);
if (WechatPayConstant.WECHAT_PAY_SIGN_TYPE_MD5.equals(signType)) {
return MD5(sb.toString()).toUpperCase();
}
else {
throw new Exception(String.format("Invalid sign_type: %s", signType));
}
}
/**
* 生成 MD5
*
* @param data 待处理数据
* @return MD5结果
*/
public static String MD5(String data) throws Exception {
java.security.MessageDigest md = MessageDigest.getInstance("MD5");
byte[] array = md.digest(data.getBytes("UTF-8"));
StringBuilder sb = new StringBuilder();
for (byte item : array) {
sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
}
return sb.toString().toUpperCase();
}
/**
* 将Map转换为XML格式的字符串
*
* @param data Map类型数据
* @return XML格式的字符串
* @throws Exception
*/
public static String generateMapToXml(Map<String, String> data) throws Exception {
org.w3c.dom.Document document = WechatPayXmlUtil.newDocument();
org.w3c.dom.Element root = document.createElement("xml");
document.appendChild(root);
for (String key: data.keySet()) {
String value = data.get(key);
if (value == null) {
value = "";
}
value = value.trim();
org.w3c.dom.Element filed = document.createElement(key);
filed.appendChild(document.createTextNode(value));
root.appendChild(filed);
}
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
DOMSource source = new DOMSource(document);
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
StringWriter writer = new StringWriter();
StreamResult result = new StreamResult(writer);
transformer.transform(source, result);
String output = writer.getBuffer().toString(); //.replaceAll("\n|\r", "");
try {
writer.close();
}
catch (Exception ex) {
}
return output;
}
/**
* XML格式字符串转换为Map
*
* @param strXML XML字符串
* @return XML数据转换后的Map
* @throws Exception
*/
public static Map<String, String> generateXmlToMap(String strXML) throws Exception {
try {
Map<String, String> data = new HashMap<String, String>();
DocumentBuilder documentBuilder = WechatPayXmlUtil.newDocumentBuilder();
InputStream stream = new ByteArrayInputStream(strXML.getBytes("UTF-8"));
org.w3c.dom.Document doc = documentBuilder.parse(stream);
doc.getDocumentElement().normalize();
NodeList nodeList = doc.getDocumentElement().getChildNodes();
for (int idx = 0; idx < nodeList.getLength(); ++idx) {
Node node = nodeList.item(idx);
if (node.getNodeType() == Node.ELEMENT_NODE) {
org.w3c.dom.Element element = (org.w3c.dom.Element) node;
data.put(element.getNodeName(), element.getTextContent());
}
}
try {
stream.close();
} catch (Exception ex) {
// do nothing
}
return data;
} catch (Exception ex) {
log.warn("Invalid XML, can not convert to map. Error message: {}. XML content: {}", ex.getMessage(), strXML);
throw ex;
}
}
/**
* 判断签名是否正确，必须包含sign字段，否则返回false。使用MD5签名。
*
* @param data Map类型数据
* @param key API密钥
* @return 签名是否正确
* @throws Exception
*/
public static boolean isSignatureValid(Map<String, String> data, String key) throws Exception {
return isSignatureValid(data, key, WechatPayConstant.WECHAT_PAY_SIGN_TYPE_MD5);
}
/**
* 判断签名是否正确，必须包含sign字段，否则返回false。
*
* @param data Map类型数据
* @param key API密钥
* @param signType 签名方式
* @return 签名是否正确
* @throws Exception
*/
public static boolean isSignatureValid(Map<String, String> data, String key, String signType) throws Exception {
if (!data.containsKey(WechatPayConstant.WECHAT_PAY_FIELD_SIGN) ) {
return false;
}
String sign = data.get(WechatPayConstant.WECHAT_PAY_FIELD_SIGN);
return generateSignature(data, key, signType).equals(sign);
}
}
