微信支付工具類

生成簽名

 /** 
     * @author szb
     * @date 2017-8-1
     * @Description：sign簽名 
     * @param characterEncoding 
     *            編碼格式 
     * @param parameters 
     *            請求參數 
     * @return 
     */  
    public static String createSign(String characterEncoding, SortedMap<Object, Object> packageParams, String API_KEY) {  
        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=" + API_KEY);  
        String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();  
        return sign;  
    } 

把map轉換成提交的xml String

/** 
     * @author 
     * @date 2017-8-1 
     * @Description：將請求參數轉換爲xml格式的string 
     * @param parameters 
     *            請求參數 
     * @return 
     */  
    public static String getRequestXml(SortedMap<Object, Object> parameters) {  
        StringBuffer sb = new StringBuffer();  
        sb.append("<xml>");  
        Set es = 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 ("attach".equalsIgnoreCase(k) || "body".equalsIgnoreCase(k) || "sign".equalsIgnoreCase(k)) {  
                sb.append("<" + k + ">" + "<![CDATA[" + v + "]]></" + k + ">");  
            } else {  
                sb.append("<" + k + ">" + v + "</" + k + ">");  
            }  
        }  
        sb.append("</xml>");  
        return sb.toString();  
    }