Spring MVC：如何返回自定义404 errorpages？ [英] Spring MVC: How to return custom 404 errorpages?

问题描述

我正在寻找一种干净的方法，在找不到请求的资源时，在Spring 4中返回自定义的404错误。对不同域类型的查询应该会产生不同的错误页面。

I'm looking for a clean way to return customized 404 errorpages in Spring 4 when a requested resource was not found. Queries to different domain types should result in different error pages.

这里有一些代码来表明我的意图（Meter是一个域类）：

Here some code to show my intention (Meter is a domain class):

@RequestMapping(value = "/{number}", method = RequestMethod.GET)
public String getMeterDetails(@PathVariable("number") final Long number, final Model model) {
    final Meter result = meterService.findOne(number);
    if (result == null) {
        // here some code to return an errorpage
    }

    model.addAttribute("meter", result);
    return "meters/details";
}

我想到了几种处理问题的方法。首先，有可能创建 RuntimeException s，如

I imagine several ways for handling the problem. First there would be the possibility to create RuntimeExceptions like

@ResponseStatus(HttpStatus.NOT_FOUND)
public class MeterNotFoundExcption extends RuntimeException { }

和然后使用异常处理程序呈现自定义错误（可能包含指向米列表的链接或适当的任何内容）。

and then use an exception handler to render a custom errorpage (maybe containing a link to a list of meters or whatever is appropriate).

但我不喜欢污染我的应用程序有许多小例外。

But I don't like polluting my application with many small exceptions.

另一种可能是使用 HttpServletResponse 并手动设置状态代码：

Another possibility would be using HttpServletResponse and set the statuscode manually:

@RequestMapping(value = "/{number}", method = RequestMethod.GET)
public String getMeterDetails(@PathVariable("number") final Long number, final Model model,
final HttpServletResponse response) {
    final Meter meter = meterService.findOne(number);
    if (meter == null) {
        response.setStatus(HttpStatus.NOT_FOUND.value());
        return "meters/notfound";
    }

    model.addAttribute("meter", meter);
    return "meters/details";
}

但是使用这个解决方案我必须复制许多控制器方法的前5行（比如编辑，删除）。

But with this solution I have to duplicate the first 5 lines for many controller methods (like edit, delete).

是否有一种优雅的方法可以防止多次重复这些行？

Is there an elegant way to prevent duplicating these lines many times?

推荐答案

解决方案比想象的要简单得多。可以使用一个通用 ResourceNotFoundException 定义如下：

The solution is much simpler than thought. One can use one generic ResourceNotFoundException defined as follows:

public class ResourceNotFoundException extends RuntimeException { }

然后可以使用 ExceptionHandler处理每个控制器中的错误注释：

class MeterController {
    // ...
    @ExceptionHandler(ResourceNotFoundException.class)
    @ResponseStatus(HttpStatus.NOT_FOUND)
    public String handleResourceNotFoundException() {
        return "meters/notfound";
    }

    // ...

    @RequestMapping(value = "/{number}/edit", method = RequestMethod.GET)
    public String viewEdit(@PathVariable("number") final Meter meter,
                           final Model model) {
        if (meter == null) throw new ResourceNotFoundException();

        model.addAttribute("meter", meter);
        return "meters/edit";
    }
}

每个控制器都可以定义自己的 ExceptionHandler 用于 ResourceNotFoundException 。

Every controller can define its own ExceptionHandler for the ResourceNotFoundException.

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