Map对象转换成JSON字符串

把map转成json需要一些jar

<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->

 

 

dependency>

            <groupId>net.sf.json-lib</groupId>

            <artifactId>json-lib</artifactId>

            <version>2.4</version>

            <classifier>jdk15</classifier>

</dependency>

<dependency>

    <groupId>com.google.code.gson</groupId>

    <artifactId>gson</artifactId>

    <version>2.8.5</version>

</dependency>

 

 

 

 

 

 

 

2、把daoMap转换成json，专 要使用jsonObject对象：

Map<String, Object> map = new HashMap<String, Object>();

map.put("userId", 1001);

map.put("userName", "张三属");

map.put("userSex", "男");

JSONObject jsonObject = JSONObject.fromObject(map);

System.out.println(jsonObject);