Java Spring中的重載控制器方法

Question

我有一個控制器，它需要對不同的 URL 參數有不同的表現。 像這樣的東西：

@RequestMapping(method = RequestMethod.GET)
public A getA(@RequestParam int id, @RequestParam String query) {
    ...
}


@RequestMapping(method = RequestMethod.GET)
public A getA(@RequestParam int id) {
    ...
}

但這似乎不起作用，我收到以下異常：

org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping found. Cannot map '[controller name]' bean method 

應用程序是否可以根據 URL 參數選擇方法？

Answer 1

在映射中指明哪些參數應該存在

@RequestMapping(method = RequestMethod.GET, params = {"id", "query"})
public A getA(@RequestParam int id, @RequestParam String query) {
    ...
}


@RequestMapping(method = RequestMethod.GET, params = {"id"})
public A getA(@RequestParam int id) {
    ...
}

從 Spring MVC 4.3 版開始，新的@GetMapping 、 @PostMapping和類似的注解也有這個params元素你可以使用

@GetMapping(params = {"id"})
public A getA(@RequestParam int id) {
    ...
}