Fixed#849#937

[wuwen5]

fix #849 双参数时同样存在内存占用大得问题.

public static <K, V> Map<K, V> parseToMap(String json, 
                                            Class<K> keyType, 
                                            Class<V> valueType) {
     return JSON.parseObject(json, 
                            new TypeReference<Map<K, V>>(keyType, valueType) {
                            });
}

// 可以这样使用
String json = "{1:{name:\"ddd\"},2:{name:\"zzz\"}}";
Map<Integer, Model> map = parseToMap(json, Integer.class, Model.class);
assertEquals("ddd", map.get(1).name);
assertEquals("zzz", map.get(2).name);

视乎 ef50a5b 引入了 #937 问题 ？

[codecov-io]

Current coverage is 91.43% (diff: 72.72%)

Merging #941 into master will decrease coverage by <.01%

@@             master       #941   diff @@
==========================================
  Files           114        114          
  Lines         16720      16713     -7   
  Methods           0          0          
  Messages          0          0          
  Branches       3926       3926          
==========================================
- Hits          15289      15282     -7   
+ Misses          700        693     -7   
- Partials        731        738     +7   

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