依赖
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.68</version>
</dependency>
JSON 字符串-》对象转换JSON
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.writeValueAsString(Object);
JSON 字符串-》JSON转换对象
Object=JSON.parseObject(str);
