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今天就跟大家聊聊有关利用java怎么实现一个微信公众号支付功能，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
工具类：
MD5Util.java
package com.yiexpress.core.utils.wechat;
import java.security.MessageDigest;
/**
* MD5工具类
*/
public class MD5Util {
public final static String MD5(String s) {
char hexDigits[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
try {
byte[] btInput = s.getBytes();
MessageDigest mdInst = MessageDigest.getInstance("MD5");
mdInst.update(btInput);
byte[] md = mdInst.digest();
int j = md.length;
char str[] = new char[j * 2];
int k = 0;
for (int i = 0; i < j; i++) {
byte byte0 = md[i];
str[k++] = hexDigits[byte0 >>> 4 & 0xf];
str[k++] = hexDigits[byte0 & 0xf];
}
String md5Str = new String(str);
return md5Str;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
}SapUtils.java
package com.yiexpress.core.utils;
import java.lang.reflect.*;
import java.util.List;
import java.io.IOException;
import java.io.StringWriter;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;
public class SapUtils {
private static final Logger logger = LoggerFactory.getLogger(SapUtils.class);
/** 根据反射对javabean转成xml文件的格式
* 以类名为第一标签，所有属性作为第二节点，并放入对应的值，如果属性为空 就不放入该熟悉
* @param dto 传入的对象
* @param operationName 操作名称
* @return
*/
public static String formatToXml(Object dto,String operationName){
logger.info("解析当前类{}为指定的xml文档格式的数据",dto.getClass().getName());
logger.info("当前的同步方法是,{}",operationName);
String result = null;
Field fields[]=dto.getClass().getDeclaredFields();//dto 是实体类名称
//DocumentHelper提供了创建Document对象的方法
Document document = DocumentHelper.createDocument();
//添加节点信息
String className=dto.getClass().getName();
// 操作的名称
Element rootElement = document.addElement(operationName);
try {
Field.setAccessible(fields, true);
for (int i = 0; i < fields.length; i++) {
//添加节点信息
if(!StringUtils.isEmpty(fields[i].get(dto))){
Class<?> type = fields[i].getType();
// 如果是list
if(type == List.class){
String listName = fields[i].getName();
createElement(rootElement, fields[i].get(dto),listName);
}
else{
Element element = rootElement.addElement(fields[i].getName());
element.setText((String) fields[i].get(dto));
}
}
}
// 设置XML文档格式
OutputFormat outputFormat = OutputFormat.createPrettyPrint();
// 设置XML编码方式,即是用指定的编码方式保存XML文档到字符串(String),这里也可以指定为GBK或是ISO8859-1
outputFormat.setEncoding("UTF-8");
// outputFormat.setSuppressDeclaration(true); //是否生产xml头
outputFormat.setIndent(true); //设置是否缩进
outputFormat.setIndent(" "); //以四个空格方式实现缩进
outputFormat.setNewlines(true); //设置是否换行
StringWriter stringWriter =null;
// Writer fileWriter =null;
// xmlWriter是用来把XML文档写入字符串的(工具)
XMLWriter xmlWriter = null;
try {
// stringWriter字符串是用来保存XML文档的
stringWriter = new StringWriter();
// fileWriter = new FileWriter("D:\\modu11le.xml");
// xmlWriter是用来把XML文档写入字符串的(工具)
xmlWriter = new XMLWriter(stringWriter, outputFormat);
// 把创建好的XML文档写入字符串
xmlWriter.write(document);
//fileWriter.write(stringWriter.toString());
result=stringWriter.toString();
} catch (IOException e) {
logger.error("写入数据失败");
throw new RuntimeException("写入数据失败"+e);
}finally{
try {
if(xmlWriter!=null){
xmlWriter.flush();
xmlWriter.close();
}
/* if(fileWriter!=null){
fileWriter.flush();
fileWriter.close();
}*/
} catch (IOException e) {
logger.error("关闭输出流出错");
throw new RuntimeException("关闭输出流出错"+e);
}
}
} catch (Exception e) {
logger.error("添加xml的节点失败"+e);
}
logger.error("转换xml结束");
return result;
}
/**
* 添加类中的list
* @param element
* @param object
* @param name
* @return
* @throws IllegalArgumentException
* @throws IllegalAccessException
*/
public static Element createElement(Element element ,Object object,String name ) throws IllegalArgumentException, IllegalAccessException{
Element nameElement = element.addElement(name);
List info = (List)object;
for(int j= 0;j<info.size();j++){
// 添加row的标签
Element rowElement = nameElement.addElement("row");
// 添加 对象的熟悉
Field fields[]=info.get(j).getClass().getDeclaredFields();//dto 是实体类名称
Field.setAccessible(fields, true);
for (int i = 0; i < fields.length; i++) {
//添加节点信息
if(!StringUtils.isEmpty(fields[i].get(info.get(j)))){
Element childElement = rowElement.addElement(fields[i].getName());
childElement.setText((String) fields[i].get(info.get(j)));
}
}
}
return element;
}
}UnifiedOrderRequest.java
package com.yiexpress.core.utils.wechat;
public class UnifiedOrderRequest {
private String appid;// 公众账号ID
private String mch_id;//商户号
private String device_info; //设备号 否
private String nonce_str;//随机字符串
private String sign;//签名
private String sign_type;//签名类型
private String body;//商品描述
private String detail;//商品详情
private String attach;//附加数据
private String out_trade_no;//商户订单号
private String fee_type;//标价币种
private String total_fee;//标价金额
private String spbill_create_ip;//终端IP
private String time_start;//交易起始时间
private String time_expire;//交易结束时间
private String goods_tag;//订单优惠标记
private String notify_url;//通知地址
private String trade_type;//交易类型
private String product_id;//商品ID
private String limit_pay;//指定支付方式
private String openid;//用户标识
public String getAppid() {
return appid;
}
public void setAppid(String appid) {
this.appid = appid;
}
public String getMch_id() {
return mch_id;
}
public void setMch_id(String mch_id) {
this.mch_id = mch_id;
}
public String getDevice_info() {
return device_info;
}
public void setDevice_info(String device_info) {
this.device_info = device_info;
}
public String getNonce_str() {
return nonce_str;
}
public void setNonce_str(String nonce_str) {
this.nonce_str = nonce_str;
}
public String getSign() {
return sign;
}
public void setSign(String sign) {
this.sign = sign;
}
public String getSign_type() {
return sign_type;
}
public void setSign_type(String sign_type) {
this.sign_type = sign_type;
}
public String getBody() {
return body;
}
public void setBody(String body) {
this.body = body;
}
public String getDetail() {
return detail;
}
public void setDetail(String detail) {
this.detail = detail;
}
public String getAttach() {
return attach;
}
public void setAttach(String attach) {
this.attach = attach;
}
public String getOut_trade_no() {
return out_trade_no;
}
public void setOut_trade_no(String out_trade_no) {
this.out_trade_no = out_trade_no;
}
public String getFee_type() {
return fee_type;
}
public void setFee_type(String fee_type) {
this.fee_type = fee_type;
}
public String getTotal_fee() {
return total_fee;
}
public void setTotal_fee(String total_fee) {
this.total_fee = total_fee;
}
public String getSpbill_create_ip() {
return spbill_create_ip;
}
public void setSpbill_create_ip(String spbill_create_ip) {
this.spbill_create_ip = spbill_create_ip;
}
public String getTime_start() {
return time_start;
}
public void setTime_start(String time_start) {
this.time_start = time_start;
}
public String getTime_expire() {
return time_expire;
}
public void setTime_expire(String time_expire) {
this.time_expire = time_expire;
}
public String getGoods_tag() {
return goods_tag;
}
public void setGoods_tag(String goods_tag) {
this.goods_tag = goods_tag;
}
public String getNotify_url() {
return notify_url;
}
public void setNotify_url(String notify_url) {
this.notify_url = notify_url;
}
public String getTrade_type() {
return trade_type;
}
public void setTrade_type(String trade_type) {
this.trade_type = trade_type;
}
public String getProduct_id() {
return product_id;
}
public void setProduct_id(String product_id) {
this.product_id = product_id;
}
public String getLimit_pay() {
return limit_pay;
}
public void setLimit_pay(String limit_pay) {
this.limit_pay = limit_pay;
}
public String getOpenid() {
return openid;
}
public void setOpenid(String openid) {
this.openid = openid;
}
}UnifiedOrderRespose.java
package com.yiexpress.core.utils.wechat;
public class UnifiedOrderRespose {
private String return_code; //返回状态码
private String return_msg; //返回信息
private String appid; //公众账号ID
private String mch_id; //商户号
private String device_info; //设备号
private String nonce_str; //随机字符串
private String sign; //签名
private String result_code; //业务结果
private String err_code; //错误代码
private String err_code_des; //错误代码描述
private String trade_type; //交易类型
private String prepay_id; //预支付交易会话标识
private String code_url; //二维码链接
public String getReturn_code() {
return return_code;
}
public void setReturn_code(String return_code) {
this.return_code = return_code;
}
public String getReturn_msg() {
return return_msg;
}
public void setReturn_msg(String return_msg) {
this.return_msg = return_msg;
}
public String getAppid() {
return appid;
}
public void setAppid(String appid) {
this.appid = appid;
}
public String getMch_id() {
return mch_id;
}
public void setMch_id(String mch_id) {
this.mch_id = mch_id;
}
public String getDevice_info() {
return device_info;
}
public void setDevice_info(String device_info) {
this.device_info = device_info;
}
public String getNonce_str() {
return nonce_str;
}
public void setNonce_str(String nonce_str) {
this.nonce_str = nonce_str;
}
public String getSign() {
return sign;
}
public void setSign(String sign) {
this.sign = sign;
}
public String getResult_code() {
return result_code;
}
public void setResult_code(String result_code) {
this.result_code = result_code;
}
public String getErr_code() {
return err_code;
}
public void setErr_code(String err_code) {
this.err_code = err_code;
}
public String getErr_code_des() {
return err_code_des;
}
public void setErr_code_des(String err_code_des) {
this.err_code_des = err_code_des;
}
public String getTrade_type() {
return trade_type;
}
public void setTrade_type(String trade_type) {
this.trade_type = trade_type;
}
public String getPrepay_id() {
return prepay_id;
}
public void setPrepay_id(String prepay_id) {
this.prepay_id = prepay_id;
}
public String getCode_url() {
return code_url;
}
public void setCode_url(String code_url) {
this.code_url = code_url;
}
}WXPayConstants.java
package com.yiexpress.core.utils.wechat;
public class WXPayConstants {
public enum SignType {
MD5, HMACSHA256
}
public static final String FAIL = "FAIL";
public static final String SUCCESS = "SUCCESS";
public static final String HMACSHA256 = "HMAC-SHA256";
public static final String MD5 = "MD5";
public static final String FIELD_SIGN = "sign";
public static final String FIELD_SIGN_TYPE = "sign_type";
}WXPayUtil.java
package com.yiexpress.core.utils.wechat;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringWriter;
import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.*;
import java.security.MessageDigest;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import com.yiexpress.core.utils.SapUtils;
import com.yiexpress.core.utils.XmlUtil;
import com.yiexpress.core.utils.wechat.WXPayConstants.SignType;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
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 org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.input.SAXBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* 支付工具类
*/
public class WXPayUtil {
private static Logger log = LoggerFactory.getLogger(WXPayUtil.class);
/**
* 生成订单对象信息
* @param orderId 订单号
* @param appId 微信appId
* @param mch_id 微信分配的商户ID
* @param body 支付介绍主体
* @param price 支付价格（放大100倍）
* @param spbill_create_ip 终端IP
* @param notify_url 异步直接结果通知接口地址
* @param noncestr
* @return
*/
public static Map<String,Object> createOrderInfo(Map<String, String> requestMap,String shopKey) {
//生成订单对象
UnifiedOrderRequest unifiedOrderRequest = new UnifiedOrderRequest();
unifiedOrderRequest.setAppid(requestMap.get("appId"));//公众账号ID
unifiedOrderRequest.setBody(requestMap.get("body"));//商品描述
unifiedOrderRequest.setMch_id(requestMap.get("mch_id"));//商户号
unifiedOrderRequest.setNonce_str(requestMap.get("noncestr"));//随机字符串
unifiedOrderRequest.setNotify_url(requestMap.get("notify_url"));//通知地址
unifiedOrderRequest.setOpenid(requestMap.get("userWeixinOpenId"));
unifiedOrderRequest.setDetail(requestMap.get("detail"));//详情
unifiedOrderRequest.setOut_trade_no(requestMap.get("out_trade_no"));//商户订单号
unifiedOrderRequest.setSpbill_create_ip(requestMap.get("spbill_create_ip"));//终端IP
unifiedOrderRequest.setTotal_fee(requestMap.get("payMoney")); //金额需要扩大100倍:1代表支付时是0.01
unifiedOrderRequest.setTrade_type("JSAPI");//JSAPI--公众号支付、NATIVE--原生扫码支付、APP--app支付
SortedMap<String, String> packageParams = new TreeMap<String, String>();
packageParams.put("appid", unifiedOrderRequest.getAppid());
packageParams.put("body", unifiedOrderRequest.getBody());
packageParams.put("mch_id", unifiedOrderRequest.getMch_id());
packageParams.put("nonce_str", unifiedOrderRequest.getNonce_str());
packageParams.put("notify_url", unifiedOrderRequest.getNotify_url());
packageParams.put("openid", unifiedOrderRequest.getOpenid());
packageParams.put("detail", unifiedOrderRequest.getDetail());
packageParams.put("out_trade_no", unifiedOrderRequest.getOut_trade_no());
packageParams.put("spbill_create_ip", unifiedOrderRequest.getSpbill_create_ip());
packageParams.put("total_fee", unifiedOrderRequest.getTotal_fee());
packageParams.put("trade_type", unifiedOrderRequest.getTrade_type());
try {
unifiedOrderRequest.setSign(generateSignature(packageParams,shopKey));//签名
} catch (Exception e) {
e.printStackTrace();
}
//将订单对象转为xml格式
String orderstr=SapUtils.formatToXml(unifiedOrderRequest,"xml").replace("<?xml version=\"1.0\" encoding=\"UTF-8\"?>","");
log.debug("封装好的统一下单请求数据："+orderstr.replace("__", "_"));
Map<String,Object> responseMap = new HashMap<String,Object>();
responseMap.put("orderInfo_toString", orderstr.replace("__", "_"));
responseMap.put("unifiedOrderRequest",unifiedOrderRequest);
return responseMap;
}
public static void main(String[] args) {
// UnifiedOrderRequest ut=new UnifiedOrderRequest();
// ut.setAppid("wx1234156789");
// ut.setBody("内容body");
// ut.setMch_id("商户号");
// ut.setNonce_str("随机字符串");
// ut.setNotify_url("回调地址");
// ut.setOpenid("openid");
// ut.setDetail("详情");
// ut.setOut_trade_no("订单号");
// ut.setSpbill_create_ip("终端IP");
// ut.setTotal_fee("金额");
// ut.setTrade_type("调用类型JSAPI");
// System.out.println("---"+SapUtils.formatToXml(ut,"xml")+"---");
// UnifiedOrderRequest unifiedOrderRequest = new UnifiedOrderRequest();
// unifiedOrderRequest.setAppid("dsfsdf");//公众账号ID
// unifiedOrderRequest.setBody("sdfsdf");//商品描述
// unifiedOrderRequest.setMch_id("sdfsd");//商户号
// unifiedOrderRequest.setNonce_str("dfsd");//随机字符串
// unifiedOrderRequest.setNotify_url("sdfdsf");//通知地址
// unifiedOrderRequest.setOpenid("sdfsdf");
//
// unifiedOrderRequest.setTrade_type("JSAPI");//JSAPI--公众号支付、NATIVE--原生扫码支付、APP--app支付
//
// System.out.println("---"+SapUtils.formatToXml(unifiedOrderRequest,"xml").replace("<?xml version=\"1.0\" encoding=\"UTF-8\"?>","")+"---");
// String str="<xml><appid>dsfsdf</appid><mch_id>sdfsd</mch_id><nonce_str>dfsd</nonce_str><body>sdfsdf</body><notify_url>sdfdsf</notify_url><trade_type>JSAPI</trade_type><openid>sdfsdf</openid></xml>";
// UnifiedOrderRequest s=SapUtils.getBeanByxml(str,UnifiedOrderRequest.class);
// System.out.println(s.getAppid()+"---"+s.getMch_id()+"--"+s.getFee_type());
}
/**
* 生成签名
* @param appid_value
* @param mch_id_value
* @param productId
* @param nonce_str_value
* @param trade_type
* @param notify_url
* @param spbill_create_ip
* @param total_fee
* @param out_trade_no
* @return
*/
private static String createSign(UnifiedOrderRequest unifiedOrderRequest,String shopKey) {
//根据规则创建可排序的map集合
SortedMap<String, String> packageParams = new TreeMap<String, String>();
packageParams.put("appid", unifiedOrderRequest.getAppid());
packageParams.put("body", unifiedOrderRequest.getBody());
packageParams.put("mch_id", unifiedOrderRequest.getMch_id());
packageParams.put("nonce_str", unifiedOrderRequest.getNonce_str());
packageParams.put("notify_url", unifiedOrderRequest.getNotify_url());
packageParams.put("out_trade_no", unifiedOrderRequest.getOut_trade_no());
packageParams.put("spbill_create_ip", unifiedOrderRequest.getSpbill_create_ip());
packageParams.put("trade_type", unifiedOrderRequest.getTrade_type());
packageParams.put("total_fee", unifiedOrderRequest.getTotal_fee());
StringBuffer sb = new StringBuffer();
Set es = packageParams.entrySet();//字典序
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
//为空不参与签名、参数名区分大小写
if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {
sb.append(k + "=" + v + "&");
}
}
//第二步拼接key，key设置路径：微信商户平台(pay.weixin.qq.com)-->账户设置-->API安全-->密钥设置
sb.append("key="+shopKey);
String sign = MD5Util.MD5(sb.toString()).toUpperCase();//MD5加密
log.error("方式一生成的签名="+sign);
return sign;
}
//xml解析
public static SortedMap<String, String> doXMLParseWithSorted(String strxml) throws Exception {
strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");
if(null == strxml || "".equals(strxml)) {
return null;
}
SortedMap<String,String> m = new TreeMap<String,String>();
InputStream in = new ByteArrayInputStream(strxml.getBytes("UTF-8"));
SAXBuilder builder = new SAXBuilder();
Document doc = builder.build(in);
Element root = doc.getRootElement();
List list = root.getChildren();
Iterator it = list.iterator();
while(it.hasNext()) {
Element e = (Element) it.next();
String k = e.getName();
String v = "";
List children = e.getChildren();
if(children.isEmpty()) {
v = e.getTextNormalize();
} else {
v = getChildrenText(children);
}
m.put(k, v);
}
//关闭流
in.close();
return m;
}
public static String getChildrenText(List children) {
StringBuffer sb = new StringBuffer();
if(!children.isEmpty()) {
Iterator it = children.iterator();
while(it.hasNext()) {
Element e = (Element) it.next();
String name = e.getName();
String value = e.getTextNormalize();
List list = e.getChildren();
sb.append("<" + name + ">");
if(!list.isEmpty()) {
sb.append(getChildrenText(list));
}
sb.append(value);
sb.append("</" + name + ">");
}
}
return sb.toString();
}
/**
* 调统一下单API
* @param orderInfo
* @return
*/
public static UnifiedOrderRespose httpOrder(String orderInfo,int index) {
//统一下单接口地址 自动适应 1中国境内 2东南亚 3其他
String[] urlList={"https://api.mch.weixin.qq.com/pay/unifiedorder","https://apihk.mch.weixin.qq.com/pay/unifiedorder"
,"https://apius.mch.weixin.qq.com/pay/unifiedorder "};
//String url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
try {
HttpURLConnection conn = (HttpURLConnection) new URL(urlList[index]).openConnection();
//加入数据
conn.setRequestMethod("POST");
conn.setDoOutput(true);
BufferedOutputStream buffOutStr = new BufferedOutputStream(conn.getOutputStream());
buffOutStr.write(orderInfo.getBytes("UTF-8"));
buffOutStr.flush();
buffOutStr.close();
//获取输入流
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
String line = null;
StringBuffer sb = new StringBuffer();
while((line = reader.readLine())!= null){
sb.append(line);
}
//xml转对象
UnifiedOrderRespose unifiedOrderRespose =XmlUtil.getBeanByxml(sb.toString(),UnifiedOrderRespose.class);
return unifiedOrderRespose;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 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> xmlToMap(String strXML) throws Exception {
try {
Map<String, String> data = new HashMap<String, String>();
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.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) {
WXPayUtil.getLogger().warn("Invalid XML, can not convert to map. Error message: {}. XML content: {}", ex.getMessage(), strXML);
throw ex;
}
}
/**
* 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 mapToXml(Map<String, String> data) throws Exception {
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder= documentBuilderFactory.newDocumentBuilder();
org.w3c.dom.Document document = documentBuilder.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;
}
/**
* 生成带有 sign 的 XML 格式字符串
*
* @param data Map类型数据
* @param key API密钥
* @return 含有sign字段的XML
*/
public static String generateSignedXml(final Map<String, String> data, String key) throws Exception {
return generateSignedXml(data, key, SignType.MD5);
}
/**
* 生成带有 sign 的 XML 格式字符串
*
* @param data Map类型数据
* @param key API密钥
* @param signType 签名类型
* @return 含有sign字段的XML
*/
public static String generateSignedXml(final Map<String, String> data, String key, SignType signType) throws Exception {
String sign = generateSignature(data, key, signType);
data.put(WXPayConstants.FIELD_SIGN, sign);
return mapToXml(data);
}
/**
* 判断签名是否正确
*
* @param xmlStr XML格式数据
* @param key API密钥
* @return 签名是否正确
* @throws Exception
*/
public static boolean isSignatureValid(String xmlStr, String key) throws Exception {
Map<String, String> data = xmlToMap(xmlStr);
if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) {
return false;
}
String sign = data.get(WXPayConstants.FIELD_SIGN);
return generateSignature(data, key).equals(sign);
}
/**
* 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, SignType.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, SignType signType) throws Exception {
if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) {
return false;
}
String sign = data.get(WXPayConstants.FIELD_SIGN);
return generateSignature(data, key, signType).equals(sign);
}
/**
* 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, SignType.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, SignType 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(WXPayConstants.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 (SignType.MD5.equals(signType)) {
return MD5(sb.toString()).toUpperCase();
}
else if (SignType.HMACSHA256.equals(signType)) {
return HMACSHA256(sb.toString(), key);
}
else {
log.error("获取签名失败，失败原因："+String.format("Invalid sign_type: %s", signType));
throw new Exception(String.format("Invalid sign_type: %s", signType));
}
}
/**
* 获取随机字符串 Nonce Str
* @return String 随机字符串
*/
public static String generateNonceStr() {
return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);
}
/**
* Map转xml数据
*/
public static String GetMapToXML(Map<String,String> param){
StringBuffer sb = new StringBuffer();
sb.append("<xml>");
for (Map.Entry<String,String> entry : param.entrySet()) {
sb.append("<"+ entry.getKey() +">");
sb.append(entry.getValue());
sb.append("</"+ entry.getKey() +">");
}
sb.append("</xml>");
return sb.toString();
}
/**
* 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();
}
/**
* 生成 HMACSHA256
* @param data 待处理数据
* @param key 密钥
* @return 加密结果
* @throws Exception
*/
public static String HMACSHA256(String data, String key) throws Exception {
Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
SecretKeySpec secret_key = new SecretKeySpec(key.getBytes("UTF-8"), "HmacSHA256");
sha256_HMAC.init(secret_key);
byte[] array = sha256_HMAC.doFinal(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();
}
/**
* 日志
* @return
*/
public static Logger getLogger() {
Logger logger = LoggerFactory.getLogger("wxpay java sdk");
return logger;
}
/**
* 获取当前时间戳，单位秒
* @return
*/
public static long getCurrentTimestamp() {
return System.currentTimeMillis()/1000;
}
/**
* 获取当前时间戳，单位毫秒
* @return
*/
public static long getCurrentTimestampMs() {
return System.currentTimeMillis();
}
/**
* 生成 uuid， 即用来标识一笔单，也用做 nonce_str
* @return
*/
public static String generateUUID() {
return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);
}
/**
* 支付签名
* @param timestamp
* @param noncestr
* @param packages
* @return
* @throws UnsupportedEncodingException
*/
public static String paySign(String timestamp, String noncestr,String packages,String appId){
Map<String, String> paras = new HashMap<String, String>();
paras.put("appid", appId);
paras.put("timestamp", timestamp);
paras.put("noncestr", noncestr);
paras.put("package", packages);
paras.put("signType", "MD5");
StringBuffer sb = new StringBuffer();
Set es = paras.entrySet();//字典序
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
//为空不参与签名、参数名区分大小写
if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {
sb.append(k + "=" + v + "&");
}
}
String sign = MD5Util.MD5(sb.toString()).toUpperCase();//MD5加密
return sign;
}
}XmlUtil.java
package com.yiexpress.core.utils;
import java.io.StringReader;
import java.lang.reflect.Field;
import java.util.Date;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.xml.sax.InputSource;
public class XmlUtil{
/**
* json 数据转换对象
*
* @param Element
* 要转换的Element数据
* @param pojo
* 要转换的目标对象类型
* @return 转换的目标对象
* @throws Exception
* 转换失败
*/
@SuppressWarnings("rawtypes")
public static Object fromXmlToBean(Element rootElt, Class pojo) throws Exception{
// 首先得到pojo所定义的字段
Field[] fields = pojo.getDeclaredFields();
// 根据传入的Class动态生成pojo对象
Object obj = pojo.newInstance();
for (Field field : fields)
{
// 设置字段可访问（必须，否则报错）
field.setAccessible(true);
// 得到字段的属性名
String name = field.getName();
// 这一段的作用是如果字段在Element中不存在会抛出异常，如果出异常，则跳过。
try
{
rootElt.elementTextTrim(name);
}
catch (Exception ex)
{
continue;
}
if (rootElt.elementTextTrim(name) != null && !"".equals(rootElt.elementTextTrim(name)))
{
// 根据字段的类型将值转化为相应的类型，并设置到生成的对象中。
if (field.getType().equals(Long.class) || field.getType().equals(long.class))
{
field.set(obj, Long.parseLong(rootElt.elementTextTrim(name)));
}
else if (field.getType().equals(String.class))
{
field.set(obj, rootElt.elementTextTrim(name));
}
else if (field.getType().equals(Double.class) || field.getType().equals(double.class))
{
field.set(obj, Double.parseDouble(rootElt.elementTextTrim(name)));
}
else if (field.getType().equals(Integer.class) || field.getType().equals(int.class))
{
field.set(obj, Integer.parseInt(rootElt.elementTextTrim(name)));
}
else if (field.getType().equals(java.util.Date.class))
{
field.set(obj, Date.parse(rootElt.elementTextTrim(name)));
}
else
{
continue;
}
}
}
return obj;
}
/**
* 把xml格式转化为指定对象
*
* @param xml
* @return
*/
@SuppressWarnings("unchecked")
public static <T> T getBeanByxml(String xml, Class<T> valueType) {
T person = null;
InputSource in = new InputSource(new StringReader(xml));
in.setEncoding("UTF-8");
SAXReader reader = new SAXReader();
Document document;
try {
document = reader.read(in);
Element root = document.getRootElement();
person = (T) XmlUtil.fromXmlToBean(root, valueType);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println("数据解析错误");
}
return person;
}
}获取预支付ID和签名的controller
package com.yiexpress.jerry.controller.ewe.wechat;
import java.util.HashMap;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import javax.servlet.http.HttpServletRequest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import com.yiexpress.core.utils.wechat.UnifiedOrderRequest;
import com.yiexpress.core.utils.wechat.UnifiedOrderRespose;
import com.yiexpress.core.utils.wechat.WXPayUtil;
/**
* 微信支付controller
*/
@Controller
@RequestMapping(value = "/wxpay")
public class WXPayController{
private static final Logger LOGGER = LoggerFactory.getLogger(WXPayController.class);
private String appId="公总号 appid";//公总号 appid
private String mchId="商家号";//商家号
private String apiKey="商户密匙";//商户密匙
/**
* 获取终端IP
* @param request
* @return
*/
public static String getIpAddr(HttpServletRequest request) {
String ip = request.getHeader( " x-forwarded-for " );
if (ip == null || ip.length() == 0 || " unknown " .equalsIgnoreCase(ip)) {
ip = request.getHeader( " Proxy-Client-IP " );
}
if (ip == null || ip.length() == 0 || " unknown " .equalsIgnoreCase(ip)) {
ip = request.getHeader( " WL-Proxy-Client-IP " );
}
if (ip == null || ip.length() == 0 || " unknown " .equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
}
return ip;
}
/**
* 支付初始化 返回预支付ID、签名等信息
* @param payMoney
* @return map
* result -1
*/
@RequestMapping("/toPayInit")
@ResponseBody
public Map<String,Object> toPay(HttpServletRequest request,@RequestParam(value="payMoney",required=true)float payMoney,@RequestParam(value="openId",required=true) String openId,@RequestParam(value="orderId",required=true)String orderId){
Map<String,Object> map = new HashMap<>();
//订单号 目前生产的随机数 后面放入指定系统唯一的单号
//判断单号是否存在
String noncestr = WXPayUtil.generateNonceStr();
Map<String,String> requestMap = new HashMap<String, String>();
requestMap.put("appId",appId);
requestMap.put("userWeixinOpenId",openId);
//之前使用ETCA单号作为商户订单号，现在改为自动生成的账单号 2018-10-25 Peter
//requestMap.put("out_trade_no",auShipmentBrief.getShipmentReference());
requestMap.put("out_trade_no","订单号");
requestMap.put("mch_id",mchId);
//计算金额 微信支付的金额的单位是分，例如：实际支付1.23元，传入参数就是123
int money=0;
try {
money=(int)(payMoney*100);
} catch (Exception e) {
map.put("result",-1);
map.put("msg","金额格式不正确");
return map;
}
requestMap.put("payMoney",money+"");
requestMap.put("spbill_create_ip", getIpAddr(request));
requestMap.put("notify_url","回调地址");
requestMap.put("noncestr", noncestr);
requestMap.put("body","微信下单账单支付");
requestMap.put("detail","散客下单账单支付");
Map<String,Object> requestInfo = WXPayUtil.createOrderInfo(requestMap,apiKey);
String orderInfo_toString = (String) requestInfo.get("orderInfo_toString");
LOGGER.debug("request 请求字符串:"+orderInfo_toString);
//判断返回码
UnifiedOrderRespose orderResponse = WXPayUtil.httpOrder(orderInfo_toString,0);// 调用统一下单接口
//判断超时的情况
if(orderResponse==null || orderResponse.getReturn_code()==null || ("SUCCESS".equals(orderResponse.getReturn_code()) && (orderResponse.getErr_code()==null || "SYSTEMERROR".equals(orderResponse.getErr_code())))){
orderResponse = WXPayUtil.httpOrder(orderInfo_toString,1);
if(orderResponse==null || orderResponse.getReturn_code()==null || ("SUCCESS".equals(orderResponse.getReturn_code()) && (orderResponse.getErr_code()==null || "SYSTEMERROR".equals(orderResponse.getErr_code())))){
orderResponse = WXPayUtil.httpOrder(orderInfo_toString,2);
}
}
LOGGER.debug("response 返回字段:==》{}",orderResponse);
//根据微信文档return_code 和result_code都为SUCCESS的时候才会返回code_url
if(null!=orderResponse && "SUCCESS".equals(orderResponse.getReturn_code()) && "SUCCESS".equals(orderResponse.getResult_code())){
String timestamp = String.valueOf(WXPayUtil.getCurrentTimestamp());
map.put("timestamp",timestamp);
map.put("noncestr",noncestr);
UnifiedOrderRequest unifiedOrderRequest = (UnifiedOrderRequest) requestInfo.get("unifiedOrderRequest");
map.put("unifiedOrderRequest",unifiedOrderRequest);
SortedMap<String, String> packageParams = new TreeMap<String, String>();
packageParams.put("appId",appId);
packageParams.put("signType","MD5");
packageParams.put("nonceStr", noncestr);
packageParams.put("timeStamp", timestamp);
String packages = "prepay_id="+orderResponse.getPrepay_id();
packageParams.put("package",packages);
String sign = null;
try {
//生成签名
sign = WXPayUtil.generateSignature(packageParams,apiKey);
} catch (Exception e) {
map.put("result",-1);
map.put("msg","支付签名信息异常");
e.printStackTrace();
}
if(sign!=null && !"".equals(sign)){
LOGGER.debug("------------支付签名："+sign+"-------------------");
map.put("paySign",sign);
map.put("result",1);
map.put("appId",appId);
}else{
map.put("result",-1);
map.put("msg","支付签名信息异常");
}
map.put("prepay_id",orderResponse.getPrepay_id());
return map;
}else{ //不成功
if(orderResponse!=null){
String text = "调用微信支付出错，返回状态码："+orderResponse.getReturn_code()+"，返回信息："+orderResponse.getReturn_msg();
if(orderResponse.getErr_code()!=null && !"".equals(orderResponse.getErr_code())){
text = text +"，错误码："+orderResponse.getErr_code()+"，错误描述："+orderResponse.getErr_code_des();
}
LOGGER.error(text);
}else{
LOGGER.error("返回值 orderResponse对象为空");
}
map.put("result",-1);
map.put("msg","支付环境异常,请稍后再试");
return map;
}
}
}jsp代码
<script type="text/javascript">
//点击支付按钮 开始支付
function toPay(){
//初步判断数据
var openId=$("#openId").val();
var payMoney=$("#payMoney").val();
$.ajax({
url : "${pageContext.request.contextPath}/toPayInit",
type:"POST",
dataType : 'json',
data:{
payMoney:payMoney,
openId:openId,
orderId:"订单号"
},
success : function(result) {
if(result.result==1){
var paySign = result.paySign;
var prepay_id = result.prepay_id;
var nonceStr = result.noncestr;
var timestamp = result.timestamp;
var unifiedOrderRequest = result.unifiedOrderRequest;
var spbill_create_ip = unifiedOrderRequest.spbill_create_ip;
var detail = unifiedOrderRequest.detail;
var out_trade_no = unifiedOrderRequest.out_trade_no;
var appId=result.appId;
onBridgeReady(paySign,prepay_id,nonceStr,timestamp,appId);
}else{
alert("失败");
}
},
error : function(data, status, e) { // 服务器响应失败时的处理函数
alert("数据异常,支付失败", 'error');
}
});
}
//调起公众号支付
function onBridgeReady(paySign,prepay_id,nonceStr,timestamp,appId){
WeixinJSBridge.invoke(
'getBrandWCPayRequest', {
"appId":appId, //appid
"timeStamp":timestamp,
"nonceStr":nonceStr, //随机串
"package":"prepay_id="+prepay_id,
"signType":"MD5",
"paySign":paySign //微信签名
},
function(res){
// 使用以上方式判断前端返回,微信团队郑重提示：res.err_msg将在用户支付成功后返回 ok，但并不保证它绝对可靠。
if(res.err_msg == "get_brand_wcpay_request:ok" ) {
alert("支付完成", 'success');
}else if(res.err_msg == "get_brand_wcpay_request:cancel" ) {
alert("取消支付", 'success');
}else if(res.err_msg == "get_brand_wcpay_request:fail"){
alert("支付失败", 'success');
}
}
);
}
</script>定义微信支付成功回调接口APIAupostController.java
package com.yiexpress.api.controller.ewe.aupost;
import java.util.HashMap;
import java.util.Map;
import javax.annotation.Resource;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.collections.MapUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.yiexpress.core.utils.wechat.WXPayUtil;
@Controller
@RequestMapping("/api")
public class APIAupostController {
private static final Logger LOGGER=LoggerFactory.getLogger(APIAupostController.class);
@Resource(name = "jacksonBean")
private MappingJackson2HttpMessageConverter jackson;
private String apiKey="商户密匙";//商户密匙
/**
* 异步回调接口
* @param request
* @param response
* @throws Exception
*/
@RequestMapping(value="/paymentNotice",produces="text/html;charset=utf-8")
@ResponseBody
public String WeixinParentNotifyPage(HttpServletRequest request,HttpServletResponse response) throws Exception{
ServletInputStream instream = request.getInputStream();
StringBuffer sb = new StringBuffer();
int len = -1;
byte[] buffer = new byte[1024];
while((len = instream.read(buffer)) != -1){
sb.append(new String(buffer,0,len));
}
instream.close();
Map<String,String> map = WXPayUtil.xmlToMap(sb.toString());//接受微信的回调的通知参数
Map<String,String> return_data = new HashMap<String,String>();
//判断签名是否正确
if(WXPayUtil.isSignatureValid(map,apiKey)){
if(map.get("return_code").toString().equals("FAIL")){
return_data.put("return_code", "FAIL");
return_data.put("return_msg", map.get("return_msg"));
}else {
String return_code=MapUtils.getString(map,"return_code");
String result_code=MapUtils.getString(map,"result_code");
if(return_code!=null && "SUCCESS".equals(return_code) && result_code!=null && "SUCCESS".equals(result_code)){
String out_trade_no =MapUtils.getString(map,"out_trade_no");//系统订单号
//支付成功,可以自定义新逻辑
}
}
}else{
return_data.put("return_code", "FAIL");
return_data.put("return_msg", "签名错误");
}
String xml = WXPayUtil.GetMapToXML(return_data);
LOGGER.error("支付通知回调结果："+xml);
return xml;
}
}看完上述内容，你们对利用java怎么实现一个微信公众号支付功能有进一步的了解吗？如果还想了解更多知识或者相关内容，请关注亿速云行业资讯频道，感谢大家的支持。
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