Question

在示例应用程序中，我有一个简单的@RestController控制器：

package app.springtest.api.book;

import app.springtest.service.BookService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.validation.Valid;

@RestController
@RequestMapping("api/v1/book")
@Slf4j
@RequiredArgsConstructor(onConstructor = @__(@Autowired))
public class BookController {

    private final BookService bookService;

    @PostMapping
    public ResponseEntity upsertBook(@Valid @RequestBody BookRequest bookRequest) {
        final BookResponse response = bookService.addBook(bookRequest);
        return ResponseEntity.ok().body(response);
    }
}

它消耗了这个Json对象。

package app.springtest.api.book;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import lombok.Data;
import lombok.RequiredArgsConstructor;
import lombok.experimental.Wither;

import javax.validation.constraints.NotBlank;

@Data
@RequiredArgsConstructor(onConstructor = @__(@JsonCreator))
@Wither
public class BookRequest {

    @NotBlank
    @JsonProperty(value = "isbn", required = true)
    private final String isbn;

    @NotBlank
    @JsonProperty(value = "name", required = true)
    private final String name;

    @JsonProperty(value = "author", required = true)
    @NotBlank
    private final String author;

}

没有什么特别的，只是Lombok生成一些样板代码。

但是，当我在应用程序配置中添加@EnableWebMvc批注时，发布请求失败并返回此错误

{
    "timestamp": 1557494204976,
    "status": 415,
    "error": "Unsupported Media Type",
    "message": "Content type 'application/json;charset=UTF-8' not supported",
    "path": "/api/v1/book"
}

并且日志中存在以下错误：

.c.j.MappingJackson2HttpMessageConverter：无法评估Jackson 类型[[简单类型，类 app.springtest.api.book.BookRequest]]： com.fasterxml.jackson.databind.exc.InvalidDefinitionException：无效类型app.springtest.api.book.BookRequest的类型定义：参数0没有属性名称，不可注入：不能用作创建者[app.springtest.api.book.BookRequest的构造方法，注释：{interface com.fasterxml.jackson.annotation.JsonCreator=@com.fasterxml.jackson.annotation.JsonCreator（mode = DEFAULT）}]

反序列化如何停止起作用？

编辑：当@RestController不存在时，为什么@EnableWebMvc类在这种情况下起作用？这不是使MVC在Spring中工作的注释吗？

为什么@EnableWebMvc会中断JSON反序列化？

0 个答案: