Spring MVC中@Controller 和@RestController 注解的区别

ManBeCool

于 2018-10-09 16:12:34 发布

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分类专栏： Spring 文章标签： SpringMVC

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本文详细解析了Spring框架中@RestController注解的使用方法及其如何简化RESTful Web服务的创建过程。该注解结合了@Controller和@ResponseBody的功能，允许开发者在不需为每个请求处理方法单独添加@ResponseBody的情况下，直接返回JSON或其他格式的数据。

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原文链接：The Spring @Controller and @RestController Annotations

The @RestController annotation was introduced in Spring 4.0 to simplify the creation of RESTful web services. It’s a convenience annotation that combines @Controller and @ResponseBody – which eliminates the need to annotate every request handling method of the controller class with the @ResponseBody annotation.
即：@RestController = @Controller + @ResponseBody*n

例如：

@Controller
@RequestMapping("books")
public class SimpleBookController {
 
    @GetMapping("/{id}", produces = "application/json")
    public @ResponseBody Book getBook(@PathVariable int id) {
        return findBookById(id);
    }
 
    private Book findBookById(int id) {
        // ...
    }
}

等价于：

@RestController
@RequestMapping("books-rest")
public class SimpleBookRestController {
     
    @GetMapping("/{id}", produces = "application/json")
    public Book getBook(@PathVariable int id) {
        return findBookById(id);
    }
 
    private Book findBookById(int id) {
        // ...
    }
}