一 ：微信支付基本流程
商户系统和微信支付系统主要交互说明：
步骤1：用户在商户APP中选择商品，提交订单，选择微信支付。
步骤2：商户后台收到用户支付单，调用微信支付统一下单接口。参见【统一下单API】。
步骤3：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
步骤4：商户APP调起微信支付。api参见【app端开发步骤说明】
步骤5：商户后台接收支付通知。api参见【支付结果通知API】
步骤6：商户后台查询支付结果。，api参见【查询订单API】
二 ：具体准备步骤
1：填写微信支付的相关信息和app信息，等待审核通过
2：获取 APPID (app 应用id)
3 ：申请成功后获取商户号
商户号及密码会发送到申请时的邮箱上
4：登录 微信商户平台 设置API_KEY（API密钥）和下载证书
5：在服务器上安装API证书
三 ： 具体demo 代码
1 ：工具类
import java.util.Date;
/**
*
* @author jiangbo_lin
* @2018-09-14
* @desc:日期工具
*/
public class DateUtils {
/**
* 获取当前系统的时间戳
*
* @return
*/
public static String getCurrentTimestamp() {
long timeStamp = new Date().getTime();
return String.valueOf(timeStamp);
}
public static String getCurrentTimestamp10() {
long timeStamp = new Date().getTime() / 1000;
String timestr = String.valueOf(timeStamp);
return timestr;
}
public static String getTimeStamp() {
int time = (int) (System.currentTimeMillis() / 1000);
return String.valueOf(time);
}
}
import java.util.*;
import java.util.Map.Entry;
/**
*@author jiangbo_lin
* 2018-09-18
* @desc:对map的key进行ASCII排序
*/
public class MapUtils {
/**
* 对map根据key进行排序 ASCII 顺序
*
* @param map 无序的map
* @return
*/
public static SortedMap<String, Object> sortMap(Map<String, Object> map) {
List<Entry<String, Object>> infoIds = new ArrayList<Entry<String, Object>>(map.entrySet());
// 排序
Collections.sort(infoIds, new Comparator<Entry<String, Object>>() {
public int compare(Entry<String, Object> o1,
Entry<String, Object> o2) {
// return (o2.getValue() - o1.getValue());//value处理
return (o1.getKey()).toString().compareTo(o2.getKey());
}
});
// 排序后
SortedMap<String, Object> sortmap = new TreeMap<String, Object>();
for (int i = 0; i < infoIds.size(); i++) {
Entry<String, Object> data = infoIds.get(i);
String key = data.getKey() ;
Object value = data.getValue();
if(value==null){
sortmap.put(data.getKey(), data.getValue());
}else{
sortmap.put(data.getKey(),data.getValue().toString());
}
}
return sortmap;
}
/**
* map to String
*
* @param map
* @return
*/
public static String toString(Map<String, Object> map) {
StringBuffer buf = new StringBuffer();
buf.append("{");
Iterator<Entry<String, Object>> i = map.entrySet().iterator();
boolean hasNext = i.hasNext();
while (hasNext) {
Entry<String, Object> e = i.next();
Object key = e.getKey();
Object value = e.getValue();
if (key == MapUtils.class)
buf.append("(this Map)");
else
buf.append(key);
buf.append("=");
if (value == MapUtils.class)
buf.append("(this Map)");
else
buf.append(value);
hasNext = i.hasNext();
if (hasNext)
buf.append(", ");
}
buf.append("}");
return buf.toString();
}
}
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import java.util.List;
import java.util.SortedMap;
import java.util.TreeMap;
/**
*
* @desc:XML 解析工具
*/
@SuppressWarnings("all")
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 SortedMap<String, Object> doXMLParse(String strxml)
throws JDOMException, IOException {
strxml = strxml.replaceFirst("encoding=".*"", "encoding="UTF-8"");
if (null == strxml || "".equals(strxml)) {
return null;
}
SortedMap<String, Object> map = new TreeMap<String, Object>();
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 key = e.getName();
String value = "";
List children = e.getChildren();
if (children.isEmpty()) {
value = e.getTextNormalize();
} else {
value = XMLUtil.getChildrenText(children);
}
map.put(key, value);
}
// 关闭流
in.close();
return map;
}
/**
* 获取子结点的xml
* @param children
* @return
*/
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();
}
}
import java.security.MessageDigest;
/**
*
* @author jiangbo_lin
* @2018/-09-14
* @desc:md5的工具类
*/
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" };
}
import javax.net.ssl.X509TrustManager;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
/**
*
* @author jiangbo_lin
* @2018-09-14
* @desc:信任管理中心
*/
public class FsTrustManager 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;
}
}
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContexts;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.SAXException;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.xml.parsers.ParserConfigurationException;
import java.io.*;
import java.net.ConnectException;
import java.net.URL;
import java.security.KeyStore;
import java.text.SimpleDateFormat;
import java.util.*;
public class WeixinPayUtil {
//获取日志记录器Logger，名字为本类类名
private static Logger logger = LoggerFactory.getLogger(WeixinPayUtil.class);
/**
* 生成随机数的方法
*
* @return String 随机数
*/
public static String generateNonceStr() {
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;
}
/**
* 生成签名字符串
*
* @param characterEncoding 编码格式
* @param parameters 参数
* @return String 签名字符串
*/
public static String createSign(String characterEncoding, SortedMap<String, Object> parameters) {
StringBuffer sb = new StringBuffer();
Iterator<Map.Entry<String, Object>> it = parameters.entrySet().iterator();
while (it.hasNext()) {
Map.Entry<String, Object> entry = (Map.Entry<String, Object>) it.next();
String key = (String) entry.getKey();
Object value = entry.getValue();//去掉带sign的项
if (null != value && !"".equals(value) && !"sign".equals(key)
&& !"key".equals(key)) {
sb.append(key + "=" + value + "&");
}
}
sb.append("key=" + WeixinConfig.API_KEY);
//注意sign转为大写
return MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
}
/**
* @param parameters 请求参数
* @return String xml格式的string
* @Description：将请求参数转换为xml格式的string
*/
public static String getRequestXml(SortedMap<String, Object> parameters) {
StringBuffer sb = new StringBuffer();
sb.append("<xml>");
Iterator<Map.Entry<String, Object>> iterator = parameters.entrySet().iterator();
while (iterator.hasNext()) {
Map.Entry<String, Object> entry = iterator.next();
String key = entry.getKey();
String value = (String) entry.getValue();
if ("attach".equalsIgnoreCase(key) || "body".equalsIgnoreCase(key)
|| "sign".equalsIgnoreCase(key)) {
sb.append("<" + key + ">" + "<![CDATA[" + value + "]]></" + key + ">");
} else {
sb.append("<" + key + ">" + value + "</" + key + ">");
}
}
sb.append("</xml>");
return sb.toString();
}
/**
* @param return_code 返回编码
* @param return_msg 返回信息
* @return
* @Description：返回给微信的参数
*/
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
* @throws Exception
*/
public static String httpsRequest(String requestUrl, String requestMethod,
String outputStr) throws Exception {
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 FsTrustManager()};
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) {
logger.error("【微信支付-连接超时】：{}", ce);
throw new RuntimeException("链接异常" + ce);
} catch (Exception e) {
logger.error("微信支付-https请求异常】：{}", e);
throw new RuntimeException("https请求异常" + e);
}
}
/**
* https双向签名认证，用于支付申请退款
*/
public static String payHttps(String url, String requestMethod, String xml) throws Exception {