修复http请求工具：ContentType为空的情况，修复多层xml解析问题

pay-java-common/src/main/java/com/egzosn/pay/common/util/XML.java

@@ -85,12 +85,12 @@ public class XML {
             while (it.hasNext()) {
                 Element e = (Element) it.next();
                 String k = e.getName();
-                String v = "";
+                Object v = "";
                 List children = e.getChildren();
                 if (children.isEmpty()) {
                     v = e.getTextNormalize();
                 } else {
-                    v = getChildrenText(children);
+                    v = getChildren(children);
                 }
                 m.put(k, v);
             }
@@ -129,6 +129,32 @@ public class XML {
         return sb.toString();
     }
 
+    /**
+     * 获取子结点的xml
+     *
+     * @param children 集合
+     * @return String 子结点的xml
+     */
+    public static Object getChildren(List children) {
+        JSONObject json = new JSONObject();
+        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();
+                if (!list.isEmpty()) {
+                    json.put(name, getChildren(list));
+                }else {
+                    json.put(name, value);
+                }
+            }
+        }
+
+        return json;
+    }
+
     /**
      * 将请求参数转换为xml格式的string
      * @param parameters 请求参数