@ResponseStatus
时间: 2024-05-31 12:10:53 浏览: 7
@ResponseStatus 是 Spring Framework 中的一个注解,用于设置 HTTP 响应的状态码和原因短语。它可以用于类和方法上,用于标记异常和成功响应的状态码。在 Spring MVC 中,当控制器方法抛出被 @ResponseStatus 注解标记的异常时,Spring MVC 将转换该异常为 HTTP 响应,并将由 @ResponseStatus 注解指定的状态码和原因短语作为响应的状态码和原因短语。
相关问题
John has developed a web application. But when he was testing his application he got the ugly result as an output. He wants to return a meaningful result on exception raised. He wants to use @ResponseStatus annotation on custom exception class handling class to return the meaningful result. which one of the following code snippets satisfied his need? import org.springframework.HttpStatus; import org.springframework.annotation.ResponseStatus;A@ResponseStatus(value = HttpStatus. NOT_FOUND, reason = "No such Keyword") public class KeywordNotFoundException extends RuntimeExceptionpublic KeywordNotFoundException(String key){super(key+" not available");
Yes, the following code snippet satisfies John's need:
```
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ResponseStatus;
@ResponseStatus(value = HttpStatus.NOT_FOUND, reason = "No such Keyword")
public class KeywordNotFoundException extends RuntimeException {
public KeywordNotFoundException(String key) {
super(key + " not available");
}
}
```
This code snippet defines a custom exception class `KeywordNotFoundException` that extends `RuntimeException`. The `@ResponseStatus` annotation is used to set the HTTP status code to `404 NOT_FOUND` and the reason to "No such Keyword" when this exception is thrown. This will return a meaningful result when an exception is raised in John's web application.
@responsemap
可能您想问的是 `@ResponseStatus` 或 `@ResponseMap`。
`@ResponseStatus` 是 Spring MVC 中的一个注解,用于指定 HTTP 响应的状态码和原因短语。它可以用于异常处理或普通方法的返回值。当使用 `@ResponseStatus` 注解标记一个异常类时,当抛出该异常时,Spring MVC 会自动返回指定的 HTTP 状态码和原因短语。示例如下:
```java
@ResponseStatus(value = HttpStatus.NOT_FOUND, reason = "User not found")
public class UserNotFoundException extends RuntimeException {
// ...
}
```
当抛出 `UserNotFoundException` 异常时,将返回 HTTP 404 状态码和 "User not found" 原因短语。
`@ResponseMap` 并不是 Spring MVC 中的注解。或许您想问的是 `@ResponseBody` 和 `Map` 的结合使用,用于返回 JSON 格式的数据。示例如下:
```java
@GetMapping("/user")
@ResponseBody
public Map<String, Object> getUser() {
Map<String, Object> map = new HashMap<>();
map.put("id", 1);
map.put("name", "Alice");
return map;
}
```
在上述代码中,`@GetMapping` 注解表示处理 GET 请求,`@ResponseBody` 注解用于指示该方法的返回值应该被序列化为 JSON 格式并写入 HTTP 响应流中。最终,返回的数据将会是 `{"id":1,"name":"Alice"}` 这样的 JSON 对象。
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