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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