Spring启动-出现意外错误（类型=错误请求，状态=400）。缺少必需的请求正文

Question

我创建了一个简单的SpringBootREST服务来处理HTML页面中的发布数据。当我发布数据时，一切正常，但当我想检查@RequestMapping value href上的数据时，我看到错误消息：

白标错误页

此应用程序没有/error的显式映射，因此您将其视为回退。

周三11月15 13:33:46CET 2017有一个意外的错误（类型=坏请求，状态=400）。缺少所需的请求正文：公共org.springframework.http.响应实体

如何检查和获取发送的数据？我的代码：

JS:

$.ajax({
    url: 'http://localhost:8080/api/questionsPost',
    dataType: 'json',
    type: 'post',
    contentType: 'application/json',
    data: JSON.stringify(scoreObj),
    success: function( data, textStatus, jQxhr ){
        console.log(data, textStatus, jQxhr)
    },
    error: function( jqXhr, textStatus, errorThrown ){
        console.log( jqXhr, textStatus, errorThrown );
    }
}); 

Rest控制器：

package pl.sample.atms.web.rest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import pl.sample.atms.dao.QuestionRepository;
import pl.sample.atms.dto.Question;
import java.util.ArrayList;
import java.util.List;

@RestController
@RequestMapping(value = "/api",  method = {RequestMethod.GET, RequestMethod.POST})
public class QuestionRestController {

    @Autowired
    private QuestionRepository questionRepository;

    @PostMapping("/questionsPost")
    public ResponseEntity<List<Question>> getQuestions5(@RequestBody Question myQuestion) {
        System.out.println(ResponseEntity.ok(new ArrayList<>()));
        System.out.println(myQuestion);
        return ResponseEntity.ok(new ArrayList<>());
    }

}

问题dto

package pl.sample.atms.dto;

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class Question {

    @Id
    private Long id;

    private String title;

    public Question() {
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }
}

问题库

package pl.sample.atms.dao;

import org.springframework.data.repository.CrudRepository;
import pl.sample.atms.dto.Question;

import java.util.List;

public interface QuestionRepository extends CrudRepository<Question, Long> {
    List<Question> findByTitle(String title);
}

使现代化

我更改了Rest控制器代码：

package pl.sample.atms.web.rest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import pl.sample.atms.dao.QuestionRepository;
import pl.sample.atms.dao.UserInfoRepository;
import pl.sample.atms.dto.Question;
import pl.sample.atms.dto.QuestionAnswer;
import pl.sample.atms.dto.Response;
import pl.sample.atms.dto.UserInfo;

import java.util.ArrayList;
import java.util.List;

import static org.apache.commons.lang3.StringUtils.isBlank;

@RestController
@RequestMapping("/api")
public class QuestionRestController {

    @Autowired
    private QuestionRepository questionRepository;

    @Autowired
    private UserInfoRepository userInfoRepository;

    private List<Question> question = new ArrayList<Question>();

    @GetMapping(value = "/questionsGet")
    public Response getResource() {
        Response response = new Response("Done", question);
        return response;
    }

    @PostMapping(value = "/questionsPost")
    public Response postCustomer(@RequestBody Question oneQuestion) {
        question.add(oneQuestion);

        Response response = new Response("Done", oneQuestion);
        return response;
    }

}

我创建了新的类-响应：

package pl.sample.atms.dto;

public class Response {
    private String status;
    private Object data;

    public Response(){

    }

    public Response(String status, Object data){
        this.status = status;
        this.data = data;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public Object getData() {
        return data;
    }

    public void setData(Object data) {
        this.data = data;
    }
}

现在我可以看到一些发送的数据，但不幸的是，它不是使用JavaScript JSON生成和发送的，但是：

{"status":"Done","data":[{"id":null,"title":null}]}

我需要的JSON的结构：

"{"N":["4","4","5","4","2"],"E":["4","4","5","3","1"],"O":["3","3","4","2","3"],"U":["2","2","2","2","4"],"S":["3","2","2","3","3"]}"

我真的不知道我做错了什么，但我觉得我已经接近解决这个问题了。

Answer 1

在使用@Post映射注释时，您将方法限制为仅发布请求。

这相当于：

@RequestMapping(value = "/questionsPost", method = RequestMethod.POST)

如果您想同时接受POST和GET，我会将其更改为：

@RequestMapping(value = "/questionsPost")

该值表明邮政请求-

更新根据你对你试图完成的事情的评论，我强烈建议有两种不同的方法。如果您要发布数据或尝试获取数据，Spring将知道调用哪个方法。然后相应地调整你的业务逻辑。

Post的一种方法：

@RequestMapping(value = "/questions", method = RequestMethod.POST)

获取的一种方法：

@RequestMapping(value = "/questions", method = RequestMethod.GET)