Spring boot 封装的http调用工具 RestTemplate 代码简洁好用

1、后端的接口定义
@PostMapping(value = "/entity")

public User insertUserEntity(@RequestBody User user) {
  user.setAid(100);
     user.setName("LiLie");     
}

2、调用后端接口

public static User insertUser() {
    // 请求头
    HttpHeaders headers = new HttpHeaders();
    // 设置请求内容为JSON类型，这里后面默认是utf-8的所以不用特意选择utf-8
    headers.setContentType(MediaType.APPLICATION_JSON);
    //headers.setch
    
    User userRequest = new User();
    userRequest.setAname("Lili");
    // 创建请求实体对象
    HttpEntity<User> request = new HttpEntity<>(userRequest, headers);
    RestTemplate restTmpl = new RestTemplate();
    // 请求时传递请求实体对象，并返回回填id的用户
    User user = restTmpl.postForObject("http://localhost:8080/myspringdemo/user/insert", request, User.class);
    System.out.println(user.getAid());
    return user;
}