微信支付 APP支付 Java 服务器端

微信支付 APP支付 Java 服务器端

本文介绍微信支付中APP支付的java服务端。

微信APP支付文档：https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=8_1

编写之前请先浏览文档中的业务流程、API列表中的统一下单和支付结果通知。

调用需要用到微信商户的APPID、商户号、API密钥。请参考微信支付文档申请和获取。

加入微信支付需要的jar.或者配置maven

需要加入

<dependency>
<groupId>org.jdom</groupId>
<artifactId>jdom</artifactId>
<version>1.0</version>
</dependency>

下面直接上代码。

一：商户后台收到用户支付单，调用微信支付统一下单接口。

服务器端提供接口，接收APP端传过来的订单id。服务器端根据id查询订单的信息。

注意：

1.微信的价格是需要乘以100的。也就是传过去1元，显示的是0.01元。

2.回调的地址必须是外网可以访问的。我的网是公司内网，所以用了花生壳弄了个映射。至于怎么使用，大家自行百度。

/**
* 微信统一下单接口
* @param request
* @param response
*/
@ResponseBody
@RequestMapping("/wxPrePay.html")
public Map<String,Object> wxPrePay(HttpServletRequest request,HttpServletResponse response){
Map<String, Object> resultMap = new HashMap<String, Object>();
GoodsTrade goodsTrade = goodsTradeService.queryGoodsTradeById(request.getParameter("tradeId"));//获取订单，根据需要自己编写
String price = goodsTrade.getPrice();
int price100 = new BigDecimal(price).multiply(new BigDecimal(100)).intValue();
if(price100<=0){
resultMap.put("msg","付款金额错误")
resultMap.put("code","500");
return resultMap;
}
//设置回调地址-获取当前的地址拼接回调地址
String url = request.getRequestURL().toString();
String domain = url.substring(0, url.length()-13);
//生产环境
String notify_url= domain+"wxNotify.html";
//测试环境
//String notify_url = "http://1f504p5895.51mypc.cn/cia/app/wxNotify.html";

SortedMap<Object,Object> parameters = new TreeMap<Object,Object>();
parameters.put("appid", ConfigUtil.APPID);
parameters.put("mch_id", ConfigUtil.MCH_ID);
parameters.put("nonce_str", PayCommonUtil.CreateNoncestr());
parameters.put("body", "购买测试");
parameters.put("out_trade_no", goodsTrade.getTid()); //订单id
parameters.put("fee_type", "CNY");
parameters.put("total_fee", String.valueOf(price100));
parameters.put("spbill_create_ip",CommonUtil.toIpAddr(request));
parameters.put("notify_url", notify_url);
parameters.put("trade_type", "APP");
//设置签名
String sign = PayCommonUtil.createSign("UTF-8",parameters);
parameters.put("sign", sign);
//封装请求参数结束
String requestXML = PayCommonUtil.getRequestXml(parameters);
//调用统一下单接口
String result = PayCommonUtil.httpsRequest(ConfigUtil.UNIFIED_ORDER_URL, "POST", requestXML);
System.out.println("\n"+result);
try {
/**统一下单接口返回正常的prepay_id，再按签名规范重新生成签名后，将数据传输给APP。参与签名的字段名为appId，partnerId，prepayId，nonceStr，timeStamp，package。注意：package的值格式为Sign=WXPay**/
Map<String, String> map = XMLUtil.doXMLParse(result);
SortedMap<Object, Object> parameterMap2 = new TreeMap<Object, Object>();
parameterMap2.put("appid", ConfigUtil.APPID);
parameterMap2.put("partnerid", ConfigUtil.MCH_ID);
parameterMap2.put("prepayid", map.get("prepay_id"));
parameterMap2.put("package", "Sign=WXPay");
parameterMap2.put("noncestr", PayCommonUtil.CreateNoncestr());
//本来生成的时间戳是13位，但是ios必须是10位，所以截取了一下
parameterMap2.put("timestamp", Long.parseLong(String.valueOf(System.currentTimeMillis()).toString().substring(0,10)));
String sign2 = PayCommonUtil.createSign("UTF-8",parameterMap2);
parameterMap2.put("sign", sign2);
resultMap.put("code","200");
resultMap.put("msg",parameterMap2);
} catch (JDOMException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return resultMap;
}

二：商户后台接收支付通知

接下来是微信的回调。当用户支付后，微信服务器端会给我们的服务器端发送异步回调。

做该步骤值之前，请先详细参考文档https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=9_7&index=3

上代码：

/**
* 微信异步通知

*/
@RequestMapping("/wxNotify.html")
public void wxNotify(HttpServletRequest request,HttpServletResponse response) throws IOException, JDOMException{
//读取参数
InputStream inputStream ;
StringBuffer sb = new StringBuffer();
inputStream = request.getInputStream();
String s ;
BufferedReader in = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
while ((s = in.readLine()) != null){
sb.append(s);
}
in.close();
inputStream.close();
//解析xml成map
Map<String, String> m = new HashMap<String, String>();
m = XMLUtil.doXMLParse(sb.toString());
for(Object keyValue : m.keySet()){
System.out.println(keyValue+"="+m.get(keyValue));
}
//过滤空 设置 TreeMap
SortedMap<Object,Object> packageParams = new TreeMap<Object,Object>();
Iterator it = m.keySet().iterator();
while (it.hasNext()) {
String parameter = (String) it.next();
String parameterValue = m.get(parameter);

String v = "";
if(null != parameterValue) {
v = parameterValue.trim();
}
packageParams.put(parameter, v);
}

//判断签名是否正确
String resXml = "";
if(PayCommonUtil.isTenpaySign("UTF-8", packageParams)) {
if("SUCCESS".equals((String)packageParams.get("result_code"))){
// 这里是支付成功
//////////执行自己的业务逻辑////////////////
String mch_id = (String)packageParams.get("mch_id"); //商户号
String openid = (String)packageParams.get("openid");  //用户标识
String out_trade_no = (String)packageParams.get("out_trade_no"); //商户订单号
String total_fee = (String)packageParams.get("total_fee");
String transaction_id = (String)packageParams.get("transaction_id"); //微信支付订单号
GoodsTrade gt = new GoodsTrade();
gt.setTid(out_trade_no);
//查询订单 根据订单号查询订单  GoodsTrade -订单实体类
GoodsTrade trade = 订单查询;

if(!ConfigUtil.MCH_ID.equals(mch_id)||trade==null||new BigDecimal(total_fee).compareTo(new BigDecimal(trade.getPrice()).multiply(new BigDecimal(100))) != 0){
logger.info("支付失败,错误信息：" + "参数错误");
resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
+ "<return_msg><![CDATA[参数错误]]></return_msg>" + "</xml> ";
}else{
if("no_pay".equals(trade.getPayStatus()) && "wait_buyer_pay".equals(trade.getStatus())){//支付的价格
//订单状态的修改。根据实际业务逻辑执行

resXml = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>"
+ "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ";

}else{
resXml = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>"
+ "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ";
logger.info("订单已处理");
}
}

}else {
logger.info("支付失败,错误信息：" + packageParams.get("err_code"));
resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
+ "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";
}

} else{
resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
+ "<return_msg><![CDATA[通知签名验证失败]]></return_msg>" + "</xml> ";
logger.info("通知签名验证失败");
}

//------------------------------
//处理业务完毕
//------------------------------
BufferedOutputStream out = new BufferedOutputStream(
response.getOutputStream());
out.write(resXml.getBytes());
out.flush();
out.close();

}

接下来提供以上用到代码的工具类.

ConfigUtil.java

package com.cia.util.wxpay;

public class ConfigUtil {
/**
* 服务号相关信息
*/
public final static String APPID = "***";//服务号的应用号
public final static String MCH_ID = "***";//商户号
public final static String API_KEY = "***";//API密钥
public final static String SIGN_TYPE = "MD5";//签名加密方式

public final static String UNIFIED_ORDER_URL = "https://api.mch.weixin.qq.com/pay/unifiedorder";
}

PayCommonUtil.java

package com.cia.util.wxpay;

import java.util.Iterator;
import java.util.Map;
import java.util.Random;
import java.util.Set;
import java.util.SortedMap;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.ConnectException;
import java.net.URL;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;

import com.alibaba.fastjson.JSONObject;

public class PayCommonUtil {
public static String CreateNoncestr(int length) {
String chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
String res = "";
for (int i = 0; i < length; i++) {
Random rd = new Random();
res += chars.indexOf(rd.nextInt(chars.length() - 1));
}
return res;
}

public static String CreateNoncestr() {
String chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
String res = "";
for (int i = 0; i < 16; i++) {
Random rd = new Random();
res += chars.charAt(rd.nextInt(chars.length() - 1));
}
return res;
}

/**
* 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。
* @return boolean
*/
public static boolean isTenpaySign(String characterEncoding, SortedMap<Object, Object> packageParams) {
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=" + ConfigUtil.API_KEY);

//算出摘要
String mysign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toLowerCase();
String tenpaySign = ((String)packageParams.get("sign")).toLowerCase();

//System.out.println(tenpaySign + "    " + mysign);
return tenpaySign.equals(mysign);
}

/**
* @Description：sign签名
* @param characterEncoding 编码格式
* @param parameters 请求参数
* @return
*/
public static String createSign(String characterEncoding,SortedMap<Object,Object> parameters){
StringBuffer sb = new StringBuffer();
Set es = parameters.entrySet();
Iterator it = es.iterator();
while(it.hasNext()) {
Map.Entry entry = (Map.Entry)it.next();
String k = (String)entry.getKey();
Object v = entry.getValue();
if(null != v && !"".equals(v)
&& !"sign".equals(k) && !"key".equals(k)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key="+ConfigUtil.API_KEY);
String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
return sign;
}
/**
* @Description：将请求参数转换为xml格式的string
* @param parameters  请求参数
* @return
*/
public static String getRequestXml(SortedMap<Object,Object> parameters){
StringBuffer sb = new StringBuffer();
sb.append("<xml>");
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)) {
sb.append("<"+k+">"+"<![CDATA["+v+"]]></"+k+">");
}else {
sb.append("<"+k+">"+v+"</"+k+">");
}
}
sb.append("</xml>");
return sb.toString();
}
/**
* @Description：返回给微信的参数
* @param return_code 返回编码
* @param return_msg  返回信息
* @return
*/
public static String setXML(String return_code, String return_msg) {
return "<xml><return_code><![CDATA[" + return_code
+ "]]></return_code><return_msg><![CDATA[" + return_msg
+ "]]></return_msg></xml>";
}

/**
* 发送https请求
* @param requestUrl 请求地址
* @param requestMethod 请求方式（GET、POST）
* @param outputStr 提交的数据
* @return 返回微信服务器响应的信息
*/
public static String httpsRequest(String requestUrl, String requestMethod, String outputStr) {
try {
// 创建SSLContext对象，并使用我们指定的信任管理器初始化
TrustManager[] tm = { new MyX509TrustManager() };
SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
sslContext.init(null, tm, new java.security.SecureRandom());
// 从上述SSLContext对象中得到SSLSocketFactory对象
SSLSocketFactory ssf = sslContext.getSocketFactory();
URL url = new URL(requestUrl);
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
//conn.setSSLSocketFactory(ssf);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
// 设置请求方式（GET/POST）
conn.setRequestMethod(requestMethod);
conn.setRequestProperty("content-type", "application/x-www-form-urlencoded");
// 当outputStr不为null时向输出流写数据
if (null != outputStr) {
OutputStream outputStream = conn.getOutputStream();
// 注意编码格式
outputStream.write(outputStr.getBytes("UTF-8"));
outputStream.close();
}
// 从输入流读取返回内容
InputStream inputStream = conn.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "UTF-8");
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String str = null;
StringBuffer buffer = new StringBuffer();
while ((str = bufferedReader.readLine()) != null) {
buffer.append(str);
}
// 释放资源
bufferedReader.close();
inputStreamReader.close();
inputStream.close();
inputStream = null;
conn.disconnect();
return buffer.toString();
} catch (ConnectException ce) {
//          log.error("连接超时：{}", ce);
} catch (Exception e) {
//          log.error("https请求异常：{}", e);
}
return null;
}

/**
* 发送https请求
*
* @param requestUrl 请求地址
* @param requestMethod 请求方式（GET、POST）
* @param outputStr 提交的数据
* @return JSONObject(通过JSONObject.get(key)的方式获取json对象的属性值)
*/
public static JSONObject httpsRequest(String requestUrl, String requestMethod) {
JSONObject jsonObject = null;
try {
// 创建SSLContext对象，并使用我们指定的信任管理器初始化
TrustManager[] tm = { new MyX509TrustManager() };
SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
sslContext.init(null, tm, new java.security.SecureRandom());
// 从上述SSLContext对象中得到SSLSocketFactory对象
SSLSocketFactory ssf = sslContext.getSocketFactory();
URL url = new URL(requestUrl);
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
//conn.setSSLSocketFactory(ssf);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setConnectTimeout(3000);
// 设置请求方式（GET/POST）
conn.setRequestMethod(requestMethod);
//conn.setRequestProperty("content-type", "application/x-www-form-urlencoded");
// 当outputStr不为null时向输出流写数据
// 从输入流读取返回内容
InputStream inputStream = conn.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "UTF-8");
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String str = null;
StringBuffer buffer = new StringBuffer();
while ((str = bufferedReader.readLine()) != null) {
buffer.append(str);
}
// 释放资源
bufferedReader.close();
inputStreamReader.close();
inputStream.close();
inputStream = null;
conn.disconnect();
jsonObject = JSONObject.parseObject(buffer.toString());
} catch (ConnectException ce) {
//                    log.error("连接超时：{}", ce);
} catch (Exception e) {
System.out.println(e);
//                    log.error("https请求异常：{}", e);
}
return jsonObject;
}

public static String urlEncodeUTF8(String source){
String result = source;
try {
result = java.net.URLEncoder.encode(source,"utf-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return result;
}
}

XMLUtil .java

package com.cia.util.wxpay;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;

public class XMLUtil {
/**
* 解析xml,返回第一级元素键值对。如果第一级元素有子节点，则此节点的值是子节点的xml数据。
* @param strxml
* @return
* @throws JDOMException
* @throws IOException
*/
public static Map doXMLParse(String strxml) throws JDOMException, IOException {
strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");

if(null == strxml || "".equals(strxml)) {
return null;
}

Map m = new HashMap();

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 = XMLUtil.getChildrenText(children);
}

m.put(k, v);
}

//关闭流
in.close();

return m;
}

/**
* 获取子结点的xml
* @param children
* @return String
*/
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(XMLUtil.getChildrenText(list));
}
sb.append(value);
sb.append("</" + name + ">");
}
}

return sb.toString();
}

}

MD5Util.java

package com.cia.util.wxpay;
import java.security.MessageDigest;

public class MD5Util {

private static String byteArrayToHexString(byte b[]) {
StringBuffer resultSb = new StringBuffer();
for (int i = 0; i < b.length; i++)
resultSb.append(byteToHexString(b[i]));

return resultSb.toString();
}

private static String byteToHexString(byte b) {
int n = b;
if (n < 0)
n += 256;
int d1 = n / 16;
int d2 = n % 16;
return hexDigits[d1] + hexDigits[d2];
}

public static String MD5Encode(String origin, String charsetname) {
String resultString = null;
try {
resultString = new String(origin);
MessageDigest md = MessageDigest.getInstance("MD5");
if (charsetname == null || "".equals(charsetname))
resultString = byteArrayToHexString(md.digest(resultString
.getBytes()));
else
resultString = byteArrayToHexString(md.digest(resultString
.getBytes(charsetname)));
} catch (Exception exception) {
}
return resultString;
}

private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

}

MyX509TrustManager.java

package com.cia.util.wxpay;

import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.ssl.X509TrustManager;

/**
* 信任管理器
*/
public class MyX509TrustManager implements X509TrustManager {

// 检查客户端证书
public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
}

// 检查服务器端证书
public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
}

// 返回受信任的X509证书数组
public X509Certificate[] getAcceptedIssuers() {
return null;
}
}

以上统一下单及回调中的订单的查询，根据自己的实际情况提供service查询，就不写出来了。所以贴上来可能有错，把错误的地方改成自己的代码就行了。