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();
  }
  /**
   * 微信服务号统一下单支付
   * 
   * @param out_trade_no
   *      订单号
   * @param body
   *      标题
   * @param openId
   *      用户的openId
   * @param money
   *      支付金额
   * @param ip
   *      客户端ip
   * @param request
   *      HttpServletRequest
   * @return
   * @throws JSONException
   */
  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h5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h5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;
  }
  /**
   * MD5
   * 
   * @param plainText
   * @return
   */
  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();
  }
  /**
   * 生成一个随机字符串
   * 
   * @param length
   *      表示生成字符串的长度
   * @return
   */
  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();
  }
}

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