springboot中List转换为json和Json转换为List

1、首先先导入阿里巴巴JSON的依赖：<dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.54</version></dependency>

2、转换代码如下：@RequestMapping("/TestfindAllUsers")public String TestUser() throws JsonProcessingException { //从数据库中获取数据 List<Users> alluser = testUserMapper.findAlluser(); //List转为json数据 String usersJson = new ObjectMapper().writeValueAsString(alluser); //输出json数据 System.out.println(usersJson); //将json再转为List数据 List<Users> usersList= JSON.parseArray(usersJson,Users.class); //遍历输出usersList for (Users u:usersList){ System.out.println(u); } return "ok ";}图片参考：