Map转Json字符串，Json字符串转Map

使用阿里的包

<dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>fastjson</artifactId>
   <version>1.2.24</version>
</dependency>

map转成json字符串

Map map=new HashMap();
map.put(“page_size”,“10”);
map.put(“page_index”,“1”);
String param= JSON.toJSONString(map);

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json字符串转map

Map map = JSON.parseObject(str);

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json字符串转List

List<Map> list = JSONArray.parseArray(json.get("data").toString(),Map.class);