How to realize APP WeChat Pay by java

< b.length; i++) resultSb.append(byteToHexString(b[i])); return resultSb.toString(); } private static String byteToHexString(byte b) { int n = b; if (n < 0) n += 256; int d1 = n / 16; int d2 = n % 16; return hexDigits[d1] + hexDigits[d2]; } public static String MD5Encode(String origin, String charsetname) { String resultString = null; try { resultString = new String(origin); MessageDigest md = MessageDigest.getInstance("MD5"); if (charsetname == null || "".equals(charsetname)) resultString = byteArrayToHexString(md.digest(resultString .getBytes())); else resultString = byteArrayToHexString(md.digest(resultString .getBytes(charsetname))); } catch (Exception exception) { } return resultString; } private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" }; }import org.apache.http.Consts;import org.apache.http.HttpEntity;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpPost;import org.apache.http.conn.ssl.SSLConnectionSocketFactory;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.ssl.SSLContexts;import org.apache.http.util.EntityUtils;import org.jdom.Document;import org.jdom.Element;import org.jdom.JDOMException;import org.jdom.input.SAXBuilder; import javax.net.ssl.SSLContext;import javax.servlet.http.HttpServletRequest;import java.io.*;import java.net.ConnectException;import java.net.HttpURLConnection;import java.net.URL;import java.security.KeyStore;import java.util.*; public class PayCommonUtil { //微信参数配置 public static String API_KEY = ConfigManager.getInstance().getConfigItem("API_KEY"); //随机字符串生成 public static String getRandomString(int length) { //length表示生成字符串的长度 String base = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 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(); } //请求xml组装 public static String getRequestXml(SortedMap parameters){ StringBuffer sb = new StringBuffer(); sb.append(""); Set es = parameters.entrySet(); Iterator it = es.iterator(); while(it.hasNext()) { Map.Entry entry = (Map.Entry)it.next(); String key = (String)entry.getKey(); String value = (String)entry.getValue(); if ("attach".equalsIgnoreCase(key)||"body".equalsIgnoreCase(key)||"sign".equalsIgnoreCase(key)) { sb.append(""+""); }else { sb.append(""+value+""); } } sb.append(""); return sb.toString(); } //生成签名 public static String createSign(String characterEncoding,SortedMap parameters){ StringBuffer sb = new StringBuffer(); Set es = parameters.entrySet(); Iterator it = es.iterator(); while(it.hasNext()) { Map.Entry entry = (Map.Entry)it.next(); String k = (String)entry.getKey(); Object v = entry.getValue(); if(null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) { sb.append(k + "=" + v + "&"); } } sb.append("key=" + API_KEY); System.out.println(sb.toString()); String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase(); return sign; } /** * 验证回调签名 * @return */ public static boolean isTenpaySign(Map map) { String characterEncoding="utf-8"; String charset = "utf-8"; String signFromAPIResponse = map.get("sign"); if (signFromAPIResponse == null || signFromAPIResponse.equals("")) { System.out.println("API返回的数据签名数据不存在，有可能被第三方篡改!!!"); return false; } System.out.println("服务器回包里面的签名是:" + signFromAPIResponse); //过滤空 设置 TreeMap SortedMap packageParams = new TreeMap(); for (String parameter : map.keySet()) { String parameterValue = map.get(parameter); String v = ""; if (null != parameterValue) { v = parameterValue.trim(); } packageParams.put(parameter, v); } StringBuffer sb = new StringBuffer(); Set es = packageParams.entrySet(); Iterator it = es.iterator(); while(it.hasNext()) { Map.Entry entry = (Map.Entry)it.next(); String k = (String)entry.getKey(); String v = (String)entry.getValue(); if(!"sign".equals(k) && null != v && !"".equals(v)) { sb.append(k + "=" + v + "&"); } } sb.append("key=" + API_KEY); //将API返回的数据根据用签名算法进行计算新的签名，用来跟API返回的签名进行比较 //算出签名 String resultSign = ""; String tobesign = sb.toString(); if (null == charset || "".equals(charset)) { resultSign = MD5Util.MD5Encode(tobesign, characterEncoding).toUpperCase(); }else{ try{ resultSign = MD5Util.MD5Encode(tobesign, characterEncoding).toUpperCase(); }catch (Exception e) { resultSign = MD5Util.MD5Encode(tobesign, characterEncoding).toUpperCase(); } } String tenpaySign = ((String)packageParams.get("sign")).toUpperCase(); return tenpaySign.equals(resultSign); } //请求方法 public static String httpsRequest(String requestUrl, String requestMethod, String outputStr) { try { URL url = new URL(requestUrl); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setDoOutput(true); conn.setDoInput(true); conn.setUseCaches(false); // 设置请求方式（GET/POST） conn.setRequestMethod(requestMethod); conn.setRequestProperty("content-type", "application/x-www-form-urlencoded"); // 当outputStr不为null时向输出流写数据 if (null != outputStr) { OutputStream outputStream = conn.getOutputStream(); // 注意编码格式 outputStream.write(outputStr.getBytes("UTF-8")); outputStream.close(); } // 从输入流读取返回内容 InputStream inputStream = conn.getInputStream(); InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8"); BufferedReader bufferedReader = new BufferedReader(inputStreamReader); String str = null; StringBuffer buffer = new StringBuffer(); while ((str = bufferedReader.readLine()) != null) { buffer.append(str); } // 释放资源 bufferedReader.close(); inputStreamReader.close(); inputStream.close(); inputStream = null; conn.disconnect(); return buffer.toString(); } catch (ConnectException ce) { System.out.println("连接超时：{}"+ ce); } catch (Exception e) { System.out.println("https请求异常：{}"+ e); } return null; } //退款的请求方法 public static String httpsRequest2(String requestUrl, String requestMethod, String outputStr) throws Exception { KeyStore keyStore = KeyStore.getInstance("PKCS12"); StringBuilder res = new StringBuilder(""); FileInputStream instream = new FileInputStream(new File("/home/apiclient_cert.p12")); try { keyStore.load(instream, "".toCharArray()); } finally { instream.close(); } // Trust own CA and all self-signed certs SSLContext sslcontext = SSLContexts.custom() .loadKeyMaterial(keyStore, "1313329201".toCharArray()) .build(); // Allow TLSv1 protocol only SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory( sslcontext, new String[] { "TLSv1" }, null, SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER); CloseableHttpClient httpclient = HttpClients.custom() .setSSLSocketFactory(sslsf) .build(); try { HttpPost httpost = new HttpPost("https://api.mch.weixin.qq.com/secapi/pay/refund"); httpost.addHeader("Connection", "keep-alive"); httpost.addHeader("Accept", "*/*"); httpost.addHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); httpost.addHeader("Host", "api.mch.weixin.qq.com"); httpost.addHeader("X-Requested-With", "XMLHttpRequest"); httpost.addHeader("Cache-Control", "max-age=0"); httpost.addHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0) "); StringEntity entity2 = new StringEntity(outputStr , Consts.UTF_8); httpost.setEntity(entity2); System.out.println("executing request" + httpost.getRequestLine()); CloseableHttpResponse response = httpclient.execute(httpost); try { HttpEntity entity = response.getEntity(); System.out.println("----------------------------------------"); System.out.println(response.getStatusLine()); if (entity != null) { System.out.println("Response content length: " + entity.getContentLength()); BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(entity.getContent())); String text = ""; res.append(text); while ((text = bufferedReader.readLine()) != null) { res.append(text); System.out.println(text); } } EntityUtils.consume(entity); } finally { response.close(); } } finally { httpclient.close(); } return res.toString(); } //xml解析 public static Map doXMLParse(String strxml) throws JDOMException, IOException { strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\""); if(null == strxml || "".equals(strxml)) { return null; } Map m = new HashMap(); InputStream in = new ByteArrayInputStream(strxml.getBytes("UTF-8")); SAXBuilder builder = new SAXBuilder(); Document doc = builder.build(in); Element root = doc.getRootElement(); List list = root.getChildren(); Iterator it = list.iterator(); while(it.hasNext()) { Element e = (Element) it.next(); String k = e.getName(); String v = ""; List children = e.getChildren(); if(children.isEmpty()) { v = e.getTextNormalize(); } else { v = getChildrenText(children); } m.put(k, v); } //关闭流 in.close(); return m; } public static String getChildrenText(List children) { StringBuffer sb = new StringBuffer(); if(!children.isEmpty()) { Iterator it = children.iterator(); while(it.hasNext()) { Element e = (Element) it.next(); String name = e.getName(); String value = e.getTextNormalize(); List list = e.getChildren(); sb.append(""); if(!list.isEmpty()) { sb.append(getChildrenText(list)); } sb.append(value); sb.append(""); } } return sb.toString(); } public static String getRemoteHost(HttpServletRequest request){ String ip = request.getHeader("x-forwarded-for"); if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)){ ip = request.getHeader("Proxy-Client-IP"); } if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)){ ip = request.getHeader("WL-Proxy-Client-IP"); } if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)){ ip = request.getRemoteAddr(); } return ip.equals("0:0:0:0:0:0:0:1")?"127.0.0.1":ip; }}package com.lemonjr.api.utils; import java.util.Map;import java.util.regex.Matcher;import java.util.regex.Pattern; public class StringUtil { /** * 数值类型前面补零（共13位） * @param num * @return */ public static String supplementZeroGenerateThirteen(int num){ String str = String.format("3d", num); return str; } /** * 数值类型前面补零（共16位） * @param num * @return */ public static String supplementZeroGenerateSixteen(int num){ String str = String.format("6d", num); return str; } /** * 数值类型前面补零（共3位） * @param num * @return */ public static String supplementZeroGenerateThree(int num){ String str = String.format("d", num); return str; } /** * 判断字符串是不是double型 * @param str * @return */ public static boolean isNumeric(String str){ Pattern pattern = Pattern.compile("[0-9]+[.]{0,1}[0-9]*[dD]{0,1}"); Matcher isNum = pattern.matcher(str); if( !isNum.matches() ){ return false; } return true; } public static String trim(String str, boolean nullFlag){ String tempStr = null; if (str != null) { tempStr = str.trim(); } if (nullFlag) { if ("".equals(tempStr) || "null".equals(tempStr)) { tempStr = null; } } else { if (tempStr == null) { tempStr = ""; } } return tempStr; } public static String replace(String strSource, String strFrom, String strTo) { if(strSource==null){ return null; } int i = 0; if ((i = strSource.indexOf(strFrom, i)) >

= 0) {char [] cSrc = strSource.toCharArray (); char [] cTo = strTo.toCharArray (); int len = strFrom.length (); StringBuffer buf = new StringBuffer (cSrc.length) Buf.append (cSrc, 0, I) .append (cTo); I + = len; int j = I While ((I = strSource.indexOf (strFrom, I)) > 0) {buf.append (cSrc, j, I-j) .append (cTo); I + = len; j = I } buf.append (cSrc, j, cSrc.length-j); return buf.toString ();} return strSource } public static String deal (String str) {str = replace (str, "\\", "\"); str = replace (str, "'", "\\"); str = replace (str, "\ r", "\\ r") Str = replace (str, "\ n", "\\ n"); str = replace (str, "\","\\ "); return str;} public static String GetMapToXML (Map param) {StringBuffer sb = new StringBuffer (); sb.append (") For (Map.Entry entry: param.entrySet ()) {sb.append ("); sb.append (entry.getValue ()); sb.append (");} sb.append ("); return sb.toString ();} public static void main (String [] args) {/ / String a = StringUtil.supplementZeroGenerateThirteen (1000) Double a = 32.System.out.println (StringUtil.isNumeric ("32.")); System.out.println (a);}}

4. The jar package used

Com.github.liyiorg weixin-popular 2.8.5 commons-httpclient commons-httpclient 3.1 org.jdom jdom2 2.0.6 Thank you for reading this article carefully. I hope the article "how to realize APP WeChat Pay in java" shared by the editor will be helpful to you. At the same time, I also hope that you will support and pay attention to the industry information channel. More related knowledge is waiting for you to learn!