微信扫码支付——模式二
代码：
PayCommonUtil.java 微信支付常用方法
1 import java.text.SimpleDateFormat;
2 import java.util.Date;
3 import java.util.Iterator;
4 import java.util.Map;
5 import java.util.Set;
6 import java.util.SortedMap;
7
8 public class PayCommonUtil
9 {
10 /**
11 * 是否签名正确,规则是:按参数名称a-z排序,遇到空值的参数不参加签名。
12 * @return boolean
13 */
14 public static boolean isTenpaySign(String characterEncoding, SortedMap<Object, Object> packageParams, String API_KEY) {
15 StringBuffer sb = new StringBuffer();
16 Set es = packageParams.entrySet();
17 Iterator it = es.iterator();
18 while(it.hasNext()) {
19 Map.Entry entry = (Map.Entry)it.next();
20 String k = (String)entry.getKey();
21 String v = (String)entry.getValue();
22 if(!"sign".equals(k) && null != v && !"".equals(v)) {
23 sb.append(k + "=" + v + "&");
24 }
25 }
26
27 sb.append("key=" + API_KEY);
28
29 //算出摘要
30 String mysign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toLowerCase();
31 String tenpaySign = ((String)packageParams.get("sign")).toLowerCase();
32
33 //System.out.println(tenpaySign + " " + mysign);
34 return tenpaySign.equals(mysign);
35 }
36
37 /**
38 * @author
39 * @date 2016-4-22
40 * @Description：sign签名
41 * @param characterEncoding
42 * 编码格式
43 * @param parameters
44 * 请求参数
45 * @return
46 */
47 public static String createSign(String characterEncoding, SortedMap<Object, Object> packageParams, String API_KEY) {
48 StringBuffer sb = new StringBuffer();
49 Set es = packageParams.entrySet();
50 Iterator it = es.iterator();
51 while (it.hasNext()) {
52 Map.Entry entry = (Map.Entry) it.next();
53 String k = (String) entry.getKey();
54 String v = (String) entry.getValue();
55 if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {
56 sb.append(k + "=" + v + "&");
57 }
58 }
59 sb.append("key=" + API_KEY);
60 String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
61 return sign;
62 }
63
64 /**
65 * @author
66 * @date 2016-4-22
67 * @Description：将请求参数转换为xml格式的string
68 * @param parameters
69 * 请求参数
70 * @return
71 */
72 public static String getRequestXml(SortedMap<Object, Object> parameters) {
73 StringBuffer sb = new StringBuffer();
74 sb.append("<xml>");
75 Set es = parameters.entrySet();
76 Iterator it = es.iterator();
77 while (it.hasNext()) {
78 Map.Entry entry = (Map.Entry) it.next();
79 String k = (String) entry.getKey();
80 String v = (String) entry.getValue();
81 if ("attach".equalsIgnoreCase(k) || "body".equalsIgnoreCase(k) || "sign".equalsIgnoreCase(k)) {
82 sb.append("<" + k + ">" + "<![CDATA[" + v + "]]></" + k + ">");
83 } else {
84 sb.append("<" + k + ">" + v + "</" + k + ">");
85 }
86 }
87 sb.append("</xml>");
88 return sb.toString();
89 }
90
91 /**
92 * 取出一个指定长度大小的随机正整数.
93 *
94 * @param length
95 * int 设定所取出随机数的长度。length小于11
96 * @return int 返回生成的随机数。
97 */
98 public static int buildRandom(int length) {
99 int num = 1;
100 double random = Math.random();
101 if (random < 0.1) {
102 random = random + 0.1;
103 }
104 for (int i = 0; i < length; i++) {
105 num = num * 10;
106 }
107 return (int) ((random * num));
108 }
109
110 /**
111 * 获取当前时间 yyyyMMddHHmmss
112 *
113 * @return String
114 */
115 public static String getCurrTime() {
116 Date now = new Date();
117 SimpleDateFormat outFormat = new SimpleDateFormat("yyyyMMddHHmmss");
118 String s = outFormat.format(now);
119 return s;
120 }
121 }
XMLUtil.java 将支付参数转换为xml格式
1 import java.io.ByteArrayInputStream;
2 import java.io.IOException;
3 import java.io.InputStream;
4 import java.util.HashMap;
5 import java.util.Iterator;
6 import java.util.List;
7 import java.util.Map;
8
9 import org.jdom.Document;
10 import org.jdom.Element;
11 import org.jdom.JDOMException;
12 import org.jdom.input.SAXBuilder;
13
14 public class XMLUtil
15 {
16 /**
17 * 解析xml,返回第一级元素键值对。如果第一级元素有子节点，则此节点的值是子节点的xml数据。
18 * @param strxml
19 * @return
20 * @throws JDOMException
21 * @throws IOException
22 */
23 public static Map doXMLParse(String strxml) throws JDOMException, IOException {
24 strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");
25
26 if(null == strxml || "".equals(strxml)) {
27 return null;
28 }
29
30 Map m = new HashMap();
31
32 InputStream in = new ByteArrayInputStream(strxml.getBytes("UTF-8"));
33 SAXBuilder builder = new SAXBuilder();
34 Document doc = builder.build(in);
35 Element root = doc.getRootElement();
36 List list = root.getChildren();
37 Iterator it = list.iterator();
38 while(it.hasNext()) {
39 Element e = (Element) it.next();
40 String k = e.getName();
41 String v = "";
42 List children = e.getChildren();
43 if(children.isEmpty()) {
44 v = e.getTextNormalize();
45 } else {
46 v = XMLUtil.getChildrenText(children);
47 }
48
49 m.put(k, v);
50 }
51
52 //关闭流
53 in.close();
54
55 return m;
56 }
57
58 /**
59 * 获取子结点的xml
60 * @param children
61 * @return String
62 */
63 public static String getChildrenText(List children) {
64 StringBuffer sb = new StringBuffer();
65 if(!children.isEmpty()) {
66 Iterator it = children.iterator();
67 while(it.hasNext()) {
68 Element e = (Element) it.next();
69 String name = e.getName();
70 String value = e.getTextNormalize();
71 List list = e.getChildren();
72 sb.append("<" + name + ">");
73 if(!list.isEmpty()) {
74 sb.append(XMLUtil.getChildrenText(list));
75 }
76 sb.append(value);
77 sb.append("</" + name + ">");
78 }
79 }
80
81 return sb.toString();
82 }
83 }
HttpUtil.java 用http连接提交支付信息参数
1 import java.io.BufferedReader;
2 import java.io.IOException;
3 import java.io.InputStreamReader;
4 import java.io.OutputStreamWriter;
5 import java.net.URL;
6 import java.net.URLConnection;
7
8 import org.apache.commons.logging.Log;
9 import org.apache.commons.logging.LogFactory;
10
11
12 public class HttpUtil
13 {
14 private static final Log logger = LogFactory.getLog("org.apache.catalina.tribes.MESSAGES" );
15
16 private final static int CONNECT_TIMEOUT = 5000; // in milliseconds
17
18 private final static String DEFAULT_ENCODING = "UTF-8";
19
20 public static String postData(String urlStr, String data){
21 return postData(urlStr, data, null);
22 }
23
24 public static String postData(String urlStr, String data, String contentType){
25 BufferedReader reader = null;
26 try {
27 URL url = new URL(urlStr);
28 URLConnection conn = url.openConnection();
29 conn.setDoOutput(true);
30 conn.setConnectTimeout(CONNECT_TIMEOUT);
31 conn.setReadTimeout(CONNECT_TIMEOUT);
32 if(contentType != null)
33 conn.setRequestProperty("content-type", contentType);
34 OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream(), DEFAULT_ENCODING);
35 if(data == null)
36 data = "";
37 writer.write(data);
38 writer.flush();
39 writer.close();
40
41 reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), DEFAULT_ENCODING));
42 System.out.println(reader.toString());
43 StringBuilder sb = new StringBuilder();
44 String line = null;
45 while ((line = reader.readLine()) != null) {
46 sb.append(line);
47 sb.append("\r\n");
48 }
49 return sb.toString();
50 } catch (IOException e) {
51 logger.error("Error connecting to " + urlStr + ": " + e.getMessage());
52 } finally {
53 try {
54 if (reader != null)
55 reader.close();
56 } catch (IOException e) {
57 }
58 }
59 return null;
60 }
61 }
MD5Util.java md5加密
1 private static String byteToHexString(byte b) {
2 int n = b;
3 if (n < 0)
4 n += 256;
5 int d1 = n / 16;
6 int d2 = n % 16;
7 return hexDigits[d1] + hexDigits[d2];
8 }
9
10 public static String MD5Encode(String origin, String charsetname) {
11 String resultString = null;
12 try {
13 resultString = new String(origin);
14 MessageDigest md = MessageDigest.getInstance("MD5");
15 if (charsetname == null || "".equals(charsetname))
16 resultString = byteArrayToHexString(md.digest(resultString
17 .getBytes()));
18 else
19 resultString = byteArrayToHexString(md.digest(resultString
20 .getBytes(charsetname)));
21 } catch (Exception exception) {
22 }
23 return resultString;
24 }
25
26 private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
27 "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
28 }
GetWeixinUrlUtil.java 获取订单生成的二维码URL
1 import java.io.UnsupportedEncodingException;
2 import java.net.URLEncoder;
3 import java.util.Map;
4 import java.util.SortedMap;
5 import java.util.TreeMap;
6
7 public class GetWeixinUrlUtil
8 {
9 //获取二维码url
10 public static String weixin_pay(String ip, VcWeixinPay vcWeixinPay) throws Exception {
11 // 账号信息
12 String appid = PayConfigUtil.APP_ID; // appid
13 String mch_id = PayConfigUtil.MCH_ID; // 商户号
14 String key = PayConfigUtil.API_KEY; // key
15 String currTime = PayCommonUtil.getCurrTime();
16 String strTime = currTime.substring(8, currTime.length());
17 String strRandom = PayCommonUtil.buildRandom(4) + "";
18 String nonce_str = strTime + strRandom;
19 int order_price = 1; // 商品价格 注意：价格的单位是分
20 String body = "商品名称"; // 商品名称
21 String out_trade_no = PayCommonUtil.getCurrTime() + PayCommonUtil.buildRandom(4); // 商户订单号
22 // 获取发起电脑 ip
23 String spbill_create_ip = ip;
24 // 回调接口
25 String notify_url = PayConfigUtil.NOTIFY_URL;
26 String trade_type = "NATIVE"; //交易类型
27 SortedMap<Object,Object> packageParams = new TreeMap<Object,Object>();
28 packageParams.put("appid", appid);
29 packageParams.put("mch_id", mch_id);
30 packageParams.put("nonce_str", nonce_str);
31 packageParams.put("body", body);
32 packageParams.put("out_trade_no", out_trade_no);
33 packageParams.put("total_fee", String.valueOf(order_price));
34 packageParams.put("spbill_create_ip", spbill_create_ip);
35 packageParams.put("notify_url", notify_url);
36 packageParams.put("trade_type", trade_type);
37 //生成签名
38 String sign = PayCommonUtil.createSign("UTF-8", packageParams,key);
39 packageParams.put("sign", sign);
40
41 String requestXML = PayCommonUtil.getRequestXml(packageParams);
42 System.out.println(requestXML);
43
44 String resXml = HttpUtil.postData(PayConfigUtil.UFDODER_URL, requestXML);
45 Map map = XMLUtil.doXMLParse(resXml);
48 String urlCode = (String) map.get("code_url");
49
50 return urlCode;
51 }
52
53 // 特殊字符处理
54 public static String UrlEncode(String src) throws UnsupportedEncodingException {
55 return URLEncoder.encode(src, "UTF-8").replace("+", "%20");
56 }
57 }
PayConfigUtil.java 微信支付参数
1 import javax.servlet.http.HttpServletRequest;
2
3 public class PayConfigUtil
4 {
5 public static final String APP_ID = "";//微信开发平台应用ID(公众号ID)
6 public static final String MCH_ID = "";//商户号(商户号ID)
7 public static final String API_KEY = "";//API key(商户号里面的)
8 public static final String CREATE_IP = "";//发起支付的ip
9 public static final String NOTIFY_URL = "";//回调地址
10 public static final String UFDODER_URL = "https://api.mch.weixin.qq.com/pay/unifiedorder";//微信统一下单接口
11 public static final String APP_SECRET = "";//应用对应的凭证(在公众号里面)
12
13 //获取ip
14 public static String getIP(HttpServletRequest request)
15 {
16 String ip = request.getRemoteAddr();
17 return ip;
18 }
19
支付回调方法
1 public void weixin_notify(HttpServletRequest request,HttpServletResponse response) throws Exception
2 {
3 System.out.println("调用回调方法");
4 //读取参数
5 InputStream inputStream ;
6 StringBuffer sb = new StringBuffer();
7 inputStream = request.getInputStream();
8 String s ;
9 BufferedReader in = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
10 while ((s = in.readLine()) != null){
11 sb.append(s);
12 }
13 in.close();
14 inputStream.close();
15
16 //解析xml成map
17 Map<String, String> m = new HashMap<String, String>();
18 m = XMLUtil.doXMLParse(sb.toString());
19
20 //过滤空 设置 TreeMap
21 SortedMap<Object,Object> packageParams = new TreeMap<Object,Object>();
22 Iterator it = m.keySet().iterator();
23 while (it.hasNext()) {
24 String parameter = (String) it.next();
25 String parameterValue = m.get(parameter);
26
27 String v = "";
28 if(null != parameterValue) {
29 v = parameterValue.trim();
30 }
31 packageParams.put(parameter, v);
32 }
33
34 // 账号信息
35 String key = PayConfigUtil.API_KEY; // key
36
37 logger.info(packageParams);
38 //判断签名是否正确
39 if(PayCommonUtil.isTenpaySign("UTF-8", packageParams,key)) {
40 //------------------------------
41 //处理业务开始
42 //------------------------------
44 String resXml = "";
45 if("SUCCESS".equals((String) packageParams.get("result_code"))){
46 // 这里是支付成功
47 //////////执行自己的业务逻辑////////////////
48 String mch_id = (String) packageParams.get("mch_id");
49 String openid = (String) packageParams.get("openid");
50 String is_subscribe = (String) packageParams.get("is_subscribe");
51 String out_trade_no = (String) packageParams.get("out_trade_no");
52 String total_fee = (String) packageParams.get("total_fee");
53 String cash_fee_s = (String) packageParams.get("cash_fee");
54 String cash_fee = String.valueOf(Integer.parseInt(cash_fee_s) / 100);
55 String time_end = MctsUtils.numberDateToDate((String) packageParams.get("time_end"));
56 String transaction_id = (String) packageParams.get("transaction_id");
57
58 //////////执行自己的业务逻辑（报存订单信息到数据库）////////////////
59 System.out.println("支付成功 ,处理业务成功");
60 logger.info("支付成功");
61 //通知微信.异步确认成功.必写.不然会一直通知后台.八次之后就认为交易失败了.
62 resXml = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>"
63 + "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ";
64 //------------------------------
65 //处理业务完毕
66 //------------------------------ //向微信服务器发送确认信息，若不发送，微信服务器会间隔不同的时间调用回调方法
67 BufferedOutputStream out = new BufferedOutputStream(
68 response.getOutputStream());
69 out.write(resXml.getBytes());
70 out.flush();
71 out.close();
73 System.out.println("通知微信.异步确认成功");
74 } else {
93 logger.info("支付失败,错误信息：" + packageParams.get("err_code"));
94 resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
95 + "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";
96
97 BufferedOutputStream out = new BufferedOutputStream(
98 response.getOutputStream());
99 out.write(resXml.getBytes());
100 out.flush();
101 out.close();
102 System.out.println("执行回调函数失败");
103 }
105 } else{
106 logger.info("通知签名验证失败");
107 }
108 }
根据GetWeixinUrlUtil.java获取到微信支付订单信息的二维码url，下载一个解析二维码的js插件（jquery.qrcode.min.js），把获取到二维码url在前端页面用jquery.qrcode.min.js解析，就能显示二维码了。 前端页面简略代码：
1 <script type="text/javascript" src="js/jquery.qrcode.min.js"></script>
2 <script language="javascript">
3 $(function(){
4 var codeUrl = ${erWeiMa};//erWeiMa是后端传的二维码url
5 $("#code").qrcode({
6 render: "canvas", //table方式
7 width: 240, //宽度
8 height:240, //高度
9 text: codeUrl //任意内容
10 });
11 });
12 </script>
13
14 <div id="code" style="width: 240px;height: 240px;margin: 0px auto;"></div>
其中用到的jar包当时忘记记录了，不知道的可以根据报错信息搜下缺少的jar包。
原文地址：https://www.cnblogs.com/kylyww/p/7476953.html
时间： 2024-08-05 18:45:30