java微信退款（支持部分退款）

package com.xiaojubianli.driver.biz.utils.pay; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; import java.util.*; /* '微信支付服务器签名支付请求请求类 '============================================================================ 'api说明： 'init(app_id, app_secret, partner_key, app_key); '初始化函数，默认给一些参数赋值，如cmdno,date等。 'setKey(key_)'设置商户密钥 'getLasterrCode(),获取最后错误号 'GetToken();获取Token 'getTokenReal();Token过期后实时获取Token 'createMd5Sign(signParams);生成Md5签名 'genPackage(packageParams);获取package包 'createSHA1Sign(signParams);创建签名SHA1 'sendPrepay(packageParams);提交预支付 'getDebugInfo(),获取debug信息 '============================================================================ '*/ public class RequestHandler { /** Token获取网关地址地址 */ private String tokenUrl; /** 预支付网关url地址 */ private String gateUrl; /** 查询支付通知网关URL */ private String notifyUrl; /** 商户参数 */ private String appid; private String appkey; private String partnerkey; private String appsecret; private String key; /** 请求的参数 */ private SortedMap parameters; /** Token */ private String Token; private String charset; /** debug信息 */ private String debugInfo; private String last_errcode; private HttpServletRequest request; private HttpServletResponse response; /** * 初始构造函数。 * * @return */ public RequestHandler(HttpServletRequest request, HttpServletResponse response) { this.last_errcode = "0"; this.request = request; this.response = response; //this.charset = "GBK"; this.charset = "UTF-8"; this.parameters = new TreeMap(); // 验证notify支付订单网关 notifyUrl = "https://gw.tenpay.com/gateway/simpleverifynotifyid.xml"; } /** * 初始化函数。 */ public void init(String app_id, String app_secret, String partner_key) { this.last_errcode = "0"; this.Token = "token_"; this.debugInfo = ""; this.appid = app_id; this.partnerkey = partner_key; this.appsecret = app_secret; this.key = partner_key; } public void init() { } /** * 获取最后错误号 */ public String getLasterrCode() { return last_errcode; } /** *获取入口地址,不包含参数值 */ public String getGateUrl() { return gateUrl; } /** * 获取参数值 * * @param parameter * 参数名称 * @return String */ public String getParameter(String parameter) { String s = (String) this.parameters.get(parameter); return (null == s) ? "" : s; } //设置密钥 public void setKey(String key) { this.partnerkey = key; } //设置微信密钥 public void setAppKey(String key){ this.appkey = key; } // 特殊字符处理 public String UrlEncode(String src) throws UnsupportedEncodingException { return URLEncoder.encode(src, this.charset).replace("+", "%20"); } // 获取package的签名包 public String genPackage(SortedMap<String, String> packageParams) throws UnsupportedEncodingException { String sign = createSign(packageParams); 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(); sb.append(k + "=" + UrlEncode(v) + "&"); } // 去掉最后一个& String packageValue = sb.append("sign=" + sign).toString(); // System.out.println("UrlEncode后 packageValue=" + packageValue); return packageValue; } /** * 创建md5摘要,规则是:按参数名称a-z排序,遇到空值的参数不参加签名。 */ public String createSign(SortedMap<String, String> packageParams) { 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 (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) { sb.append(k + "=" + v + "&"); } } sb.append("key=" + this.getKey()); String sign = MD5Util.MD5Encode(sb.toString(), this.charset) .toUpperCase(); return sign; } /** * 创建package签名 */ public boolean createMd5Sign(String signParams) { StringBuffer sb = new StringBuffer(); Set es = this.parameters.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 + "&"); } } // 算出摘要 String enc = TenpayUtil.getCharacterEncoding(this.request, this.response); String sign = MD5Util.MD5Encode(sb.toString(), enc).toLowerCase(); String tenpaySign = this.getParameter("sign").toLowerCase(); // debug信息 this.setDebugInfo(sb.toString() + " => sign:" + sign + " tenpaySign:" + tenpaySign); return tenpaySign.equals(sign); } //输出XML public String parseXML() { StringBuffer sb = new StringBuffer(); sb.append("<xml>"); Set es = this.parameters.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(null != v && !"".equals(v) && !"appkey".equals(k)) { sb.append("<" + k +">" + getParameter(k) + "</" + k + ">\n"); } } sb.append("</xml>"); return sb.toString(); } /** * 设置debug信息 */ protected void setDebugInfo(String debugInfo) { this.debugInfo = debugInfo; } public void setPartnerkey(String partnerkey) { this.partnerkey = partnerkey; } public String getDebugInfo() { return debugInfo; } public String getKey() { return key; } }