How to “throw” JSF2 404 error?

前端未结

关注

 3  1886

Let\'s say that I have an application which manages users. You can add new user, delete them, edit detail etc. Each user has na ID and has detail page on URL like this:

相关标签:

3条回答

温柔的废话

2020-12-16 16:47

As mentioned, you can get the context from within a managed bean. I tried the validator approach, but for me it wasn't applicable since I was using two parameters to initialize my bean, and I do want to throw a 404. For me .setResponseStatus didn't throw the 404-page. Just gave a non-informative browser page. So I used the responseSendError instead.

0 讨论(0)
发布评论:

提交评论
- 加载中...
小蘑菇

2020-12-16 16:58
(I ended up here searching for something similar but here's another pattern I used on a similar problem)

The Validation/ExternalContext response above is a very good way to handle it, alternatively (since you are already inside the context) you can handle the error when parsing in the parameters from the request and deal with it internally. I think it is more of how you want to handle it in your flow than a "here's a better solution"
```
//Inside "SomeManagedBean"
  public String getParam()
  {
    String value = (String) FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("key");
    if(value == null)
      return "key not Exist";
    else
      return value;

  }
```
//JSF 2.0 Source (something.xhtml) ... ...

I think the above is generally easier to work with inside the framework (you don't have to send out to an error page and disrupt the flow), but really it is simply an architectural decision. Both solutions are similar, it is just a question of breaking the flow or internal handling. Either way the ExternalContext is your friend.
0 讨论(0)
发布评论:

提交评论
- 加载中...

旧巷少年郎

2020-12-16 17:04

Just attach a validator to the id view parameter and if validation fails, set error code 404 on the response.

e.g.

Consider this simple Facelet:

<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core">

    <f:metadata>
        <f:viewParam id="id" name="id" value="#{myBean.id}" validator="#{myBean.validate}"/>
    </f:metadata>

    <h:body>

        <h:outputText value="#{myBean.id}"/>

    </h:body>

</html>

And the following backing bean:

@ManagedBean
@ViewScoped
public class MyBean {

    private Long id;

    public void validate(FacesContext context, UIComponent component, Object object) {
        // Do some validation
        // And if failed:
        context.getExternalContext().setResponseStatus(404);
        context.responseComplete();
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

}

0 讨论(0)