Spring:当我的类已经用@RestController 注释时，为什么我还要使用@RequestBody? [英] Spring : Why should I still use @RequestBody when my class is already annotated with @RestController?

问题描述

我目前正在将 Java 和 Spring 用于我的 Web 服务应用程序.我正在使用 @RestController 注释，希望消除使用 @ResponseBody 和 @RequestBody 注释的需要.不幸的是，删除 @RequestBody 注释会使序列化失败.

I'm currently using Java and Spring for my web service applications. I'm using the @RestController annotation hoping to remove the need to use the @ResponseBody and @RequestBody annotations. Unfortunately, removing the @RequestBody annotations makes the serialization to fail.

这是我的代码，它没有将请求正文映射到我没有的方法参数:

Here's my code that doesn't map the request body to my method parameter that doesn't :

@RestController
@RequestMapping(value = "/member", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_UTF8_VALUE, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
public class MemberController {
    @Autowired
    private MemberService memberService;

    @RequestMapping("/create")
    public void create(Member member) {
        memberService.create(member);
    }

    @RequestMapping("/read")
    public Member read(Member member) {
        return memberService.read(member);
    }

    @RequestMapping("/update")
    public void update(Member member) {
        memberService.update(member);
    }

    @RequestMapping("/delete")
    public void delete(Member member) {
        memberService.delete(member);
    }

    @RequestMapping("/retrieveById")
    public Member retrieveById(Member member) {
        return memberService.retrieveById(member);
    }

    @RequestMapping("/retrieveAll")
    public List<Member> retrieveAll(Member member) {
        return memberService.retrieveAll();
    }
}

当我已经在使用 @RestController 时，我真的需要使用 @RequestBody 注释吗?

Do I really need to use the @RequestBody annotation when I'm already using the @RestController?

推荐答案

@RestController 包含 @ResponseBody 所以你不再需要这个了.

@RestController contains @ResponseBody so you do not need this any more.

但是你仍然需要@RequestBody注解，因为你为POST请求调用的方法可能包含多个参数，其中一个映射到请求主体，方法的其他参数可能是 PathVariables 或例如 UriComponentsBuilder.

But you still need the @RequestBody annotation, because the method you call for a POST request might contain more than one parameters, one of which is mapped to the request body, other parameters of the method might be PathVariables or for example a UriComponentsBuilder.

并且要标记要映射到请求正文的参数，您需要注释.

And to mark the parameter which is to be mapped to the request body, you need the annotation.

这篇关于Spring:当我的类已经用@RestController 注释时，为什么我还要使用@RequestBody?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！