微信小程序 支付后台java实现实例(2)

import org.w3c.dom.NodeList; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import java.io.ByteArrayInputStream; import java.io.InputStream; import java.io.UnsupportedEncodingException; import java.util.Map; import java.util.Random; public class WXPayUtil { //生成随机字符串 public static String getNonce_str() { String base = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; Random random = new Random(); StringBuilder sb = new StringBuilder(); for (int i = 0; i < 15; i++) { int number = random.nextInt(base.length()); sb.append(base.charAt(number)); } return sb.toString(); } //map转xml 加上签名信息 public static String map2Xml(Map<String, Object> map) throws UnsupportedEncodingException { StringBuffer sb = new StringBuffer(); StringBuilder sb2 = new StringBuilder(); sb2.append("<xml>"); for (String key : map.keySet()) { sb.append(key); sb.append('='); sb.append(map.get(key)); sb.append('&'); // sb2是用来做请求的xml参数 sb2.append("<" + key + ">"); // sb2.append("<![CDATA[" + map.get(key) + "]]>"); sb2.append(map.get(key)); sb2.append("</" + key + ">"); } sb.append(System.getenv("signKey")); String sign = MD5.getMessageDigest(sb.toString().getBytes()).toUpperCase(); sb2.append("<sign>"); sb2.append(sign); sb2.append("</sign>"); sb2.append("</xml>"); return sb2.toString(); } //解析微信返回return_code SUCCESS或FILE //根据微信返回resultXml再次生成签名 public static String getSign(Map<String, Object> map) { StringBuffer sb = new StringBuffer(); for (String key : map.keySet()) { sb.append(key); sb.append('='); sb.append(map.get(key)); sb.append('&'); } sb.append(System.getenv("signKey")); System.out.println("第二次签名内容:" + sb); System.out.println("第二次签名SING:" + MD5.getMessageDigest(sb.toString().getBytes()).toUpperCase()); return MD5.getMessageDigest(sb.toString().getBytes()).toUpperCase(); } //解析微信返回return_code SUCCESS或FILE public static String getReturnCode(String resultXml) { String nonceStr; DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder builder; try { builder = dbf.newDocumentBuilder(); InputStream inputStream = new ByteArrayInputStream(resultXml.getBytes()); org.w3c.dom.Document doc = builder.parse(inputStream); // // 下面开始读取 org.w3c.dom.Element root = doc.getDocumentElement(); // 获取根元素 NodeList nl = root.getElementsByTagName("return_code"); org.w3c.dom.Element el = (org.w3c.dom.Element) nl.item(0); org.w3c.dom.Node nd = el.getFirstChild(); nonceStr = nd.getNodeValue(); return nonceStr; } catch (Exception e) { e.printStackTrace(); return null; } } //解析微信返回return_msg public static String getReturn_msg(String resultXml) { String nonceStr; DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder builder; try { builder = dbf.newDocumentBuilder(); InputStream inputStream = new ByteArrayInputStream(resultXml.getBytes()); org.w3c.dom.Document doc = builder.parse(inputStream); // // 下面开始读取 org.w3c.dom.Element root = doc.getDocumentElement(); // 获取根元素 NodeList nl = root.getElementsByTagName("return_msg"); org.w3c.dom.Element el = (org.w3c.dom.Element) nl.item(0); org.w3c.dom.Node nd = el.getFirstChild(); nonceStr = nd.getNodeValue(); return nonceStr; } catch (Exception e) { e.printStackTrace(); return null; } } //解析微信返回appid public static String getAppId(String resultXml) { String nonceStr; DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder builder; try { builder = dbf.newDocumentBuilder(); InputStream inputStream = new ByteArrayInputStream(resultXml.getBytes()); org.w3c.dom.Document doc = builder.parse(inputStream); // // 下面开始读取 org.w3c.dom.Element root = doc.getDocumentElement(); // 获取根元素 NodeList nl = root.getElementsByTagName("appid"); org.w3c.dom.Element el = (org.w3c.dom.Element) nl.item(0); org.w3c.dom.Node nd = el.getFirstChild(); nonceStr = nd.getNodeValue(); return nonceStr; } catch (Exception e) { e.printStackTrace(); return null; } } //解析微信返回mch_id public static String getMchId(String resultXml) { String nonceStr; DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder builder; try { builder = dbf.newDocumentBuilder(); InputStream inputStream = new ByteArrayInputStream(resultXml.getBytes()); org.w3c.dom.Document doc = builder.parse(inputStream); // // 下面开始读取 org.w3c.dom.Element root = doc.getDocumentElement(); // 获取根元素 NodeList nl = root.getElementsByTagName("mch_id"); org.w3c.dom.Element el = (org.w3c.dom.Element) nl.item(0); org.w3c.dom.Node nd = el.getFirstChild(); nonceStr = nd.getNodeValue(); return nonceStr; } catch (Exception e) { e.printStackTrace(); return null; } } //解析微信返回nonce_str public static String getNonceStr(String resultXml) { String nonceStr; DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder builder; try { builder = dbf.newDocumentBuilder(); InputStream inputStream = new ByteArrayInputStream(resultXml.getBytes()); org.w3c.dom.Document doc = builder.parse(inputStream); // // 下面开始读取 org.w3c.dom.Element root = doc.getDocumentElement(); // 获取根元素 NodeList nl = root.getElementsByTagName("nonce_str"); org.w3c.dom.Element el = (org.w3c.dom.Element) nl.item(0); org.w3c.dom.Node nd = el.getFirstChild(); nonceStr = nd.getNodeValue(); return nonceStr; } catch (Exception e) { e.printStackTrace(); return null; } } //解析微信返回prepay_id public static String getPrepayId(String resultXml) { String nonceStr; DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder builder; try { builder = dbf.newDocumentBuilder(); InputStream inputStream = new ByteArrayInputStream(resultXml.getBytes()); org.w3c.dom.Document doc = builder.parse(inputStream); // // 下面开始读取 org.w3c.dom.Element root = doc.getDocumentElement(); // 获取根元素 NodeList nl = root.getElementsByTagName("prepay_id"); org.w3c.dom.Element el = (org.w3c.dom.Element) nl.item(0); org.w3c.dom.Node nd = el.getFirstChild(); nonceStr = nd.getNodeValue(); return nonceStr; } catch (Exception e) { e.printStackTrace(); return null; } } }