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.append(" ").append(appid).append("");

xml.append("").append(body).append("");

xml.append(" ").append(mch_id).append("");

xml.append(" ").append(nonce_str).append("");

xml.append(" ").append(openId).append("");

xml.append(" ").append(notify_url).append("");

xml.append(" ").append(out_trade_no).append("");

xml.append(" ").append(ip).append("");

xml.append(" ").append(weixinMoney).append("");

xml.append(" ").append(trade_type).append("");

xml.append(" ").append(sign).append("");

xml.append("");

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 "";//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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