1.org中jackson转换json,springboot中内置jackson

ObjectMapper o=new ObjectMapper();

List<>list=new ArrayList();

String jons=o.writeAsValueString(list);

2.alibaba中fastjson转换成json

    @GetMapping("/test")
    public TbUser testHttpClient(){
        String url="http://localhost:8080/saveUser";
        TbUser user = new TbUser();
        user.setPhone("13568775074");
        user.setUsername("minming");
        user.setPassword("123456");
        //fastjson的JSONObject将Object转json
        String s = JSONObject.toJSONString(user);
        //返回json类型数据
        String result = CloseableHttpCilentsUtils.doPost(url, user, null);
        fastjson的JSONObject将json转Object
        JSONObject  response = JSONObject.parseObject(result);
        TbUser parse = JSONObject.toJavaObject(response, TbUser.class);
        return parse;
    }

返回结果：

{
  "password": "123456",
  "phone": "13568775074",
  "username": "minming"
}