微信支付发送HTTPS请求的并且解析返回的结果

一、统一下单支付接口主方法

Map<String,String> params = Maps.newHashMap();
//微信开放平台审核通过的应用APPID
params.put("appid", ConstantApp.WEIXIN_APPID);
//微信支付分配的商户号
params.put("mch_id", ConstantApp.WEIXIN_MERCHANT_NO);
//随机字符串
params.put("nonce_str", RandomStringUtils.random(32, true, true));
//商品描述
params.put("body", subject);
//商户订单号
params.put("out_trade_no", outTradeNo);
//总金额
params.put("total_fee", totalAmount+"");
//终端IP
params.put("spbill_create_ip", spbill_create_ip);
//通知地址
params.put("notify_url", ConstantApp.WEIXIN_NOTIFY_URL);
//交易类型
params.put("trade_type", "APP");
//签名
params.put("sign", CommonService.sign(params));

String xmlStr = HttpsClientUtil.httpsRequest(ConstantApp.WEIXIN_UNIFED_ORDER_URL, "POST", CommonService.getRequestXml(params));
Map<String, String> resultMap = CommonService.doXMLParse(xmlStr);

二、发送HTTPS请求的方法

package common;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.ConnectException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.commons.lang3.RandomStringUtils;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import ggframework.bottom.log.GGLogger;

/**
*
* 利用HttpClient进行post请求的工具类
*
* @version 1.0
* @since JDK1.7
*/
public class HttpsClientUtil {
// 请求方法
public static String httpsRequest(String requestUrl, String requestMethod, String outputStr) {
try {

URL url = new URL(requestUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();

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) {
GGLogger.error("连接超时：{}" + ce);
} catch (Exception e) {
GGLogger.info("https请求异常：{}" + e);
}
return null;
}
}

三、解析微信支付返回的XML格式数据

/**
*
* 方法描述 解析xml
*
* @param strxml
* @return
*
* @author yaomy
* @date 2017年12月8日 上午11:26:47
*/
public static Map<String, String> doXMLParse(String strxml) {

Map<String, String> m = new HashMap<String, String>();
try {
strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");

if (null == strxml || "".equals(strxml)) {
return null;
}
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.getTextNormaliz
c2bc
e();
} else {
v = getChildrenText(children);
}

m.put(k, v);
}
// 关闭流
in.close();
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
} catch (IOException e) {

} catch (JDOMException e) {
}

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();
}

四、开发过程中用到的jar包

dom-2.0.2.jar

httpmime-4.2.1.jar

httpcore-4.2.1.jar

httpclient-cache-4.2.1.jar

httpclient-4.2.1.jar

commons-lang3.jar

另外这里面还涉及到对传递的参数进行ASII码排序，请参考我的上一篇博客