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();
  }
}

二是支付回调PayCallBackServlet:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONML;
import org.json.JSONObject;

public class PayCallBackServlet extends HttpServlet {

  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    response.setContentType("text/html; charset=utf-8");
    PrintWriter out = response.getWriter();
    out.print(doWxServer(request));
    out.flush();
    out.close();
  }

  /**
   * 处理微信回调
   *
   * @param request
   * @return
   * @throws ServletException
   * @throws IOException
   */
  public String doWxServer(HttpServletRequest request) {
    System.out.println("微信服务号支付回调");
    String inputLine;
    StringBuilder notityXml = new StringBuilder();
    BufferedReader bufferedReader = null;
    try {
      bufferedReader = request.getReader();
      while ((inputLine = bufferedReader.readLine()) != null)
        notityXml.append(inputLine);
      if (bufferedReader != null)
        bufferedReader.close();
      if (notityXml.length() < 10) {
        return "fail";
      }
      String appid = "", total_fee = "", bank_type = "", cash_fee = "", fee_type = "", is_subscribe = "", mch_id = "", nonce_str = "";
      String out_trade_no = "", transaction_id = "", openid = "", sign = "", result_code = "", return_code = "", time_end = "", trade_type = "";
      JSONArray result = JSONML.toJSONObject(notityXml.toString()).getJSONArray("childNodes");
      int len = result.length();
      for (int i = 0; i < len; i++) {
        JSONObject js = result.getJSONObject(i);
        Object tagName = js.get("tagName");
        if (tagName.equals("appid")) {
          appid = js.getJSONArray("childNodes").getString(0);
        } else if (tagName.equals("bank_type")) {
          bank_type = js.getJSONArray("childNodes").getString(0);
        } else if (tagName.equals("cash_fee")) {
          cash_fee = js.getJSONArray("childNodes").getString(0);
        } else if (tagName.equals("fee_type")) {
          fee_type = js.getJSONArray("childNodes").getString(0);
        } else if (tagName.equals("is_subscribe")) {
          is_subscribe = js.getJSONArray("childNodes").getString(0);
        } else if (tagName.equals("mch_id")) {
          mch_id = js.getJSONArray("childNodes").getString(0);
        } else if (tagName.equals("nonce_str")) {
          nonce_str = js.getJSONArray("childNodes").getString(0);
        } else if (tagName.equals("openid")) {
          openid = js.getJSONArray("childNodes").getString(0);
        } else if (tagName.equals("out_trade_no")) {
          out_trade_no = js.getJSONArray("childNodes").getString(0);
        } else if (tagName.equals("result_code")) {
          result_code = js.getJSONArray("childNodes").getString(0);
        } else if (tagName.equals("return_code")) {
          return_code = js.getJSONArray("childNodes").getString(0);
        } else if (tagName.equals("time_end")) {
          time_end = js.getJSONArray("childNodes").getString(0);
        } else if (tagName.equals("total_fee")) {
          total_fee = js.getJSONArray("childNodes").getInt(0) + "";
        } else if (tagName.equals("trade_type")) {
          trade_type = js.getJSONArray("childNodes").getString(0);
        } else if (tagName.equals("transaction_id")) {
          transaction_id = js.getJSONArray("childNodes").getString(0);
        } else if (tagName.equals("sign")) {
          sign = js.getJSONArray("childNodes").getString(0);
        }
      }
      StringBuilder str = new StringBuilder();
      str.append("appid=").append(appid).append("&bank_type=").append(bank_type).append("&cash_fee=").append(cash_fee).append("&fee_type=");
      str.append(fee_type).append("&is_subscribe=").append(is_subscribe).append("&mch_id=").append(mch_id).append("&nonce_str=");
      str.append(nonce_str).append("&openid=").append(openid).append("&out_trade_no=").append(out_trade_no).append("&result_code=").append(result_code)
          .append("&return_code=").append(return_code).append("&time_end=").append(time_end).append("&total_fee=").append(total_fee);
      str.append("&trade_type=").append(trade_type).append("&transaction_id=").append(transaction_id).append("&key=").append(UnifiedorderServlet.api_key);
      if (!MD5Purity(str.toString()).equals(sign)) {// 验证签名
        System.out.println("微信服务号支付回调签名异常sign=" + sign);
        System.out.println(str);
        System.out.println(result);
        return "fail";
      }
      total_fee = new java.text.DecimalFormat("#0.00").format(Double.parseDouble(total_fee) / 100);// 支付金额以分为单位
      return "<xml><return_code><!--[CDATA[SUCCESS]]--></return_code><return_msg><!--[CDATA[OK]]--></return_msg></xml>";//成功后给微信返回数据
    } catch (JSONException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
    return "fail";
  }

  /**
   * 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();
  }
}

大功告成

总结

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