使用 OGNL 在 Struts 2 中创建具有 2 个动作参数的动态 URL [英] Creating dynamic URL with 2 action parameters in Struts 2 using OGNL

问题描述

如果我有一个 url:www.myurl.com/books 并且希望能够创建新的 过滤作者和年份:www.myurl.com/books/Sartre/1942 通过将 Sartre 和 1942 作为参数传递给 action 类，它将呈现书籍页面适当的结果.如何在 Struts2 中做到这一点?

If I have a url: www.myurl.com/books and want to be able to create new <s:url> filtering on author and year: www.myurl.com/books/Sartre/1942 by passing Sartre and 1942 as parameters to the action class which will render the books page with the appropriate results. How to do this in Struts2?

我有后端逻辑，所以如果:

I have the backend logic in place so it would be great if:

1. 我可以重用与永久链接相同的 jsp 和 action 类www.myurl.com/books 使用.
2. 显示动态呈现的 URL www.myurl.com/books/Sartre/1942即使在获取请求加载页面之后，在地址栏中(不是 www.myurl.com/books，即).

1. I could reuse the same jsp and action class that the permalink www.myurl.com/books uses.
2. Show the dynamically rendered URL www.myurl.com/books/Sartre/1942 in the address bar even after the get request has loaded the page (not www.myurl.com/books, that is).

推荐答案

您需要高级通配符映射.

来自文档:Struts2 的高级通配符映射:

高级通配符

从2.1.9+开始可以在action中定义正则表达式名称.要使用这种形式的通配符，以下常量必须是设置:

From 2.1.9+ regular expressions can be defined defined in the action name. To use this form of wild card, the following constants must be set:

<constant name="struts.enable.SlashesInActionNames" value="true"/> 
<constant name="struts.mapper.alwaysSelectFullNamespace" value="false"/>
<constant name="struts.patternMatcher" value="regex" />

正则表达式可以有两种形式，最简单的一种是{FIELD_NAME}，在这种情况下，带有 FIELD_NAME 的字段在action 将填充匹配的文本，例如:

The regular expressions can be in two forms, the simplest one is {FIELD_NAME}, in which case the field with the FIELD_NAME in the action will be populated with the matched text, for example:

<package name="books" extends="struts-default" namespace="/">
    <action name="/{type}/content/{title}" class="example.BookAction">
        <result>/books/content.jsp</result>
    </action> 
</package>

在这个例子中，如果 url /fiction/content/Frankenstein 是请求，BookAction 的字段type"将设置为fiction"，并且字段title"将设置为Frankenstein".

In this example, if the url /fiction/content/Frankenstein is requested, BookAction's field "type" will be set to "fiction", and the field "title" will be set to "Frankenstein".

如果使用 Struts2-Convention-Plugin，您的示例将是:

If using Struts2-Convention-Plugin, your example would be:

@Action(value="/books/{author}/{year}")
public class Books extends ActionSupport {
    private String  author; 
    private Integer year;
    /* ...GETTERS AND SETTERS HERE... */

    public String execute(){            
        /* ...LOAD DATA HERE... */
        if (noDataFound)
            return NONE;
        return SUCCESS
    }
}

如果您需要在 prepare() 方法中使用这些参数，请阅读此问题.

If you need to work with those parameters in prepare() method, read this question.

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