Java微信支付之服务号支付代码示例

Java微信支付之服务号支付实现，网上的java微信支付sdk和Demo基本上是水的，看着头疼所以我决心自己开始写Java微信支付之公众号支付，多的不说见下面源码，为了方便使用我分别用了两个Servlet，一个是统一下单UnifiedorderServlet，一个是支付回调PayCallBackServlet，你们可以自己封装。

一是统一下单UnifiedorderServlet:

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.PrintWriter;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.URL;import java.security.MessageDigest;import java.security.NoSuchAlGorithmException;import java.util.Random;import javax.servlet.ServletException;import javax.servlet.http.httpservlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.http.ParseException;import org.apache.http.client.ClientProtocolException;import org.JSON.jsONArray;import org.json.JSONException;import org.json.JSONML;import org.json.JSONObject;public class UnifiedorderServlet extends HttpServlet {  private static final long serialVersionUID = 1L;  private static final String appid = "";// 找微信  private static final String mch_id = "";// 找微信  public static final String api_key = "";// 找微信  private static final String trade_type = "JSAPI";// 写死  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    response.setContentType("text/html; charset=utf-8");    PrintWriter out = response.getWriter();    JSONObject jso = new JSONObject();    double money = 0.01;    String openId = "", out_trade_no = "", body = "测试", ip = "";    try {      out.print(execute(out_trade_no, body, openId, money, ip, jso).toString());    } catch (JSONException e) {      e.printStackTrace();    }    out.flush();    out.close();  }    public JSONObject execute(String out_trade_no, String body, String openId, double money, String ip, JSONObject jso) throws JSONException {    StringBuilder xml = new StringBuilder();    String notify_url = "https://test.com/payCallBack";// 支付回调地址    String prepay_id = "", sign = "", charset = "UTF-8", nonce_str = "";    try {      String weixinMoney = new java.text.DecimalFORMat("#").format(money * 100);// 微信是以分为单位的所以要乘以100      nonce_str = getRandomString(32);      xml.append("appid=").append(appid).append("&body=").append(new String(body.getBytes(charset), charset));// 处理中文      xml.append("&mch_id=").append(mch_id).append("&nonce_str=").append(nonce_str);      xml.append("¬ify_url=").append(notify_url).append("&openid=").append(openId);      xml.append("&out_trade_no=").append(out_trade_no).append("&spbill_create_ip=").append(ip);      xml.append("&total_fee=").append(weixinMoney).append("&trade_type=").append(trade_type).append("&key=").append(api_key);      sign = MD5Purity(xml.toString());      // System.out.println(xml);      xml.delete(0, xml.length());      xml.append("<xml>");      xml.append("  ").append(appid).append("</appid>");      xml.append("").append(body).append("");      xml.append("  <mch_id>").append(mch_id).append("</mch_id>");      xml.append("  <nonce_str>").append(nonce_str).append("</nonce_str>");      xml.append("  <openid>").append(openId).append("</openid>");      xml.append("  <notify_url>").append(notify_url).append("</notify_url>");      xml.append("  <out_trade_no>").append(out_trade_no).append("</out_trade_no>");      xml.append("  <spbill_create_ip>").append(ip).append("</spbill_create_ip>");      xml.append("  <total_fee>").append(weixinMoney).append("</total_fee>");      xml.append("  <trade_type>").append(trade_type).append("</trade_type>");      xml.append("  <sign>").append(sign).append("</sign>");      xml.append("</xml>");      HttpURLConnection conn = (HttpURLConnection) new URL("https://api.mch.weixin.qq.com/pay/unifiedorder").openConnection();      conn.setDoOutput(true);      conn.setRequestMethod("POST");      conn.setRequestProperty("Content-Type", "text/xml");      conn.setRequestProperty("Charset", charset);      OutputStream os = conn.getOutputStream();      os.write(xml.toString().getBytes(charset));      xml.delete(0, xml.length());      os.close();      int responseCode = conn.getResponseCode();      InputStreamReader in = null;      BufferedReader br = null;      if (responseCode == 200) {        in = new InputStreamReader(conn.getInputStream(), charset);        br = new BufferedReader(in);        String retData = null;        while ((retData = br.readLine()) != null)          xml.append(retData);        JSONArray childnodes = JSONML.toJSONObject(xml.toString()).getJSONArray("childNodes");        int len = childNodes.length() - 1;        for (int i = len; i > -1; i--) {          JSONObject js = childNodes.getJSONObject(i);          if (js.get("tagName").equals("prepay_id")) {            prepay_id = js.getJSONArray("childNodes").getString(0);            break;          }        }      }      if (in != null)        in.close();      if (br != null)        br.close();      conn.disconnect();      // ----------------------------------给h6返回的数据      String timeStamp = System.currentTimeMillis() + "";      timeStamp = timeStamp.substring(0, 10);// 微信只要精确到秒      nonce_str = getRandomString(32);      jso.put("appId", appid);      jso.put("nonceStr", nonce_str);      jso.put("package", "prepay_id=" + prepay_id);      jso.put("signType", "MD5");      jso.put("timeStamp", timeStamp);      xml.delete(0, xml.length());      xml.append("appId=").append(appid);      xml.append("&nonceStr=").append(nonce_str);      xml.append("&package=").append(jso.getString("package"));      xml.append("&signType=").append(jso.getString("signType"));      xml.append("&timeStamp=").append(timeStamp);      xml.append("&key=").append(api_key);      sign = MD5Purity(new String(xml.toString().getBytes(charset), charset));      jso.put("paySign", sign);      //返回的数据主要用在这地方 https://pay.weixin.qq.com/wiki/doc/api/jsapi.PHP?chapter=7_7&index=6      // ----------------------------------给h6返回的数据    } catch (UnsupportedEncodingException e) {      e.printStackTrace();    } catch (ParseException e) {      e.printStackTrace();    } catch (ClientProtocolException e) {      e.printStackTrace();    } catch (IOException e) {      e.printStackTrace();    }    return jso;  }    public String MD5Purity(String plainText) {    try {      MessageDigest md = MessageDigest.getInstance("MD5");      md.update(plainText.getBytes("utf-8"));      byte b[] = md.digest();      int i;      StringBuffer buf = new StringBuffer("");      for (int offset = 0; offset < b.length; offset++) {        i = b[offset];        if (i < 0)          i += 256;        if (i < 16)          buf.append("0");        buf.append(Integer.toHexString(i));      }      plainText = buf.toString();    } catch (NoSuchAlgorithmException e) {      e.printStackTrace();    } catch (UnsupportedEncodingException e) {      e.printStackTrace();    }    return plainText.toUpperCase();  }    private String getRandomString(int length) {    String base = "abcdefghijklmnopqrstuvwxyz0123456789";    Random random = new Random();    StringBuffer sb = new StringBuffer();    for (int i = 0; i < length; i++) {      int number = random.nextInt(base.length());      sb.append(base.charAt(number));    }    return sb.toString();  }}