使用springrest控制器的java

Question

我试图在数据库中发布某些内容时，在使用@RestController时遇到了一些问题。我的目标是尝试获得如下结果：

{   

    "postID": "5",

    "content": "testcontent",

    "time": "13.00",

    "gender": "Man"

}

在“localhost:port/posts”中发布类似内容时（使用邮递员）：

{  

    "content": "testcontent",

    "time": "13.00",

    "gender": "Man"
}

帖子。java

package bananabackend;

public class Post {

private final long id;
private String content;
private String time;
private String gender;  


// Constructor

public Post(long id, String content, String time, String gender) {
    this.id = id;
    this.content = content;
    this.time = time;
    this.gender = gender;
}

// Getters

public String getContent() {
    return content;
}

public long getId() {
    return id;
}

public String getTime() {
    return time;
}

public String getGender() {
    return gender;
}

后置控制器。java

package bananabackend;

import java.util.concurrent.atomic.AtomicLong;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import bananabackend.Post;


@RestController
public class PostController {    

private final AtomicLong counter = new AtomicLong();

@RequestMapping(value="/posts", method = RequestMethod.POST)
public Post postInsert(@RequestParam String content, @RequestParam    String time, @RequestParam String gender) {
    return new Post(counter.incrementAndGet(), content, time, gender);
    }
}

PostRepository。java

package bananabackend;

import java.util.List;


import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;

@RepositoryRestResource(collectionResourceRel = "posts", path = "posts")
public interface PostRepository extends MongoRepository<Post, String> {


List<Post> findPostByContent(@Param("content") String content);

}

我得到这个错误：

{

    "timestamp": 1460717792270,

    "status": 400,

    "error": "Bad Request",

    "exception":  
    "org.springframework.web.bind.MissingServletRequestParameterException",

    "message": "Required String parameter 'content' is not present",

    "path": "/posts"
}

我想为每一篇文章设置一个ID，但它似乎不起作用。我试图构建与本指南类似的代码：

https://spring.io/guides/gs/rest-service/

Answer 1

您正在尝试获取在请求正文中发送的请求参数。请求参数是您在URL中发送的参数

不要使用@RequestParam ...使用@RequestBody Post post例如：

@RequestMapping(value="/posts", method = RequestMethod.POST)
public Post postInsert(@RequestBody Post post) {
    return new Post(counter.incrementAndGet(), post.getContent(), post.getTime(), post.getGender());
}

此外，在Post类中还需要一个默认构造函数