集合初始化指定长度

src/main/java/com/lq/code/util/sql/SqlUtil.java

@@ -73,9 +73,10 @@ public class SqlUtil {
      * @return
      */
     public static Map<String,String> getAttributeAndColumn(Class entityClazz){
-        Map<String,String> map=new HashMap<>();
+
         List<Field> fieldsList=BeanUtil.getAllField(entityClazz);
         Iterator iterator = fieldsList.iterator();
+        Map<String,String> map=new HashMap<>(fieldsList.size());
         while (iterator.hasNext()){
             Field field = (Field) iterator.next();
             map.put(field.getName(),caseToHump(field.getName()));

src/main/java/com/lq/wechat/util/MessageUtil.java

@@ -30,13 +30,13 @@ public class  MessageUtil {
 	 * @throws DocumentException
 	 */
 	public static Map<String, String> xmlToMap(HttpServletRequest req) throws IOException, DocumentException{
-		Map<String, String> map=new HashMap<>();
 		SAXReader reader=new SAXReader();
 		InputStream ins=req.getInputStream();
 		String resultString=IoUtil.convertStreamToString(ins);
 		Document doc=DocumentHelper.parseText(resultString);
 		Element root=doc.getRootElement();
 		List<Element> list=root.elements();
+		Map<String, String> map=new HashMap<>(list.size());
 		for(Element e:list){
 			map.put(e.getName(), e.getText());
 		}