java – Spring MVC – 基于Accept标头的@ExceptionHandler

2023年3月10日 169次阅读

我有一个HandlerInterceptorAdapter拦截所有请求并执行用户授权检查.非常基本：

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    User user = ... // get user
    checkIfAuthorized(user); // throws AuthorizationException
    return true;
}

然后,我有一个@ExceptionHandler用于AuthorizationException.

@ExceptionHandler(value = AuthorizationException.class) 
public ResponseEntity<String> handleNotAuthorized(AuthorizationException e) {
    // TODO Custom EXCEPTION HANDLER for json/jsp/xml/other types, based on content type
    ResponseEntity<String> responseEntity = new ResponseEntity<>("You are not authorized to access that page.", HttpStatus.UNAUTHORIZED);
    return responseEntity;
}

如果(未经授权的)请求接受text / plain(并且可以很容易地为json更改),这很好.
如何为特定的Accept标头创建不同的@ExceptionHandlers？

@RequestMapping有produce(). @ExceptionHandler有类似的东西吗？

最佳答案 我想到两种方法：

手动

public ResponseEntity<String> handleNotAuthorized(AuthorizationException e, HttpServletRequest request) {
    // TODO Custom EXCEPTION HANDLER for json/jsp/xml/other types, based on content type
    if (/*read header accept from request and build appropiate response*/) {}
    ResponseEntity<String> responseEntity = new ResponseEntity<>("You are not authorized to access that page.", HttpStatus.UNAUTHORIZED);
    return responseEntity;

自动

@ResponseBody
public SomeObject handleNotAuthorized(AuthorizationException e, HttpServletRequest request) {
    // TODO Custom EXCEPTION HANDLER for json/jsp/xml/other types, based on content type
    /* Construct someObject and let Spring MessageConverters transform it to JSON or XML. I don't remember what happens in case of HTML (it should go to a view)*/
    return someObject;

不要忘记设置响应的状态代码.

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