java - Java Spring中的重载 Controller 方法

Question

我有一个 Controller ，它需要在不同的 URL 参数下表现出不同的行为。像这样的:

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


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

但这似乎不起作用，我得到以下异常:

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 

应用程序是否可以根据 URL 参数选择方法？

Answer 1

在映射中指明应该存在哪些参数

@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) {
    ...
}

从 Spring MVC 4.3 版开始，新的 @GetMapping、@PostMapping 和类似的注解也有这个 params 元素可以使用

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