RequestMapping POST API 有问题吗?

问题描述

我不知道我在这里做错了什么.我正在使用邮递员"应用程序向服务发送请求.该参数是一个非常简单的 POJO，如下所示.当我尝试发送请求时，我得到一个响应:服务器拒绝了这个请求，因为请求实体的格式不受所请求方法的请求资源支持"

I can't fiure out what I am doing wrong here. I am using the app "Postman" to send a request to a service. The parameter is a very simple POJO shown below. When I attempt to send the request I get a response: "The server refused this request because the request entity is in a format not supported by the requested resource for the requested method"

用于请求的类:

 public class LoginAttempt {

        private String userName;
        private String password;
        public String getUserName() {
            return userName;
        }
        public void setUserName(String userName) {
            this.userName = userName;
        }
        public String getPassword() {
            return password;
        }
        public void setPassword(String password) {
            this.password = password;
        }
    }

控制器中的 API:

@RequestMapping(value="/validate", method=RequestMethod.POST, produces="application/json") 
public boolean validateUser(@RequestBody LoginAttempt login) {
    System.out.println("Login attempt for user " + login.getUserName() + login.getPassword());
    return true;
}

推荐答案

FormHttpMessageConverter 用于 @RequestBody-annotated 参数，当内容类型为 application/x-www-form-urlencoded 时无法绑定目标类作为 @ModelAttribute 可以).因此你需要@ModelAttribute 而不是@RequestBody

FormHttpMessageConverter which is used for @RequestBody-annotated parameters when content type is application/x-www-form-urlencoded cannot bind target classes as @ModelAttribute can).Therefore you need @ModelAttribute instead of @RequestBody

或者像这样使用@ModelAttribute注解而不是@RequestBody

Either Use @ModelAttribute annotation instead of @RequestBody like this

     public boolean validateUser(@ModelAttribute LoginAttempt login) 

或者您可以创建一个单独的方法表单处理表单数据，使用适当的 headers 属性，如下所示:

or you can create a separate method form processing form data with the appropriate headers attribute like this:

    @RequestMapping(value="/validate", method=RequestMethod.POST, headers = "content-type=application/x-www-form-urlencoded" produces="application/json")

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