关于Struts2的action重定向

"redirect"实现action的重定向：

 

<result name="error" type="redirect">
    Register.action?username=${username}
</result>

 

 "redirectAction"实现action的重定向：

 

<result name="error" type="redirectAction">
    <param name="actionName">Register</param>
    <param name="username">${username}</param>
</result>

 

 或者：

 

<result name="error" type="redirectAction">
    <param name="actionName">
        Register?username=${username}
    </param>
</result>

 

 

看了下"redirectAction"的实现类ServletActionRedirectResult.java，是这样描述的：

 

/**
 * <!-- START SNIPPET: description -->
 *
 * This result uses the {@link ActionMapper} provided by the {@link ActionMapperFactory} to redirect the browser to a
 * URL that invokes the specified action and (optional) namespace. This is better than the {@link ServletRedirectResult}
 * because it does not require you to encode the URL patterns processed by the {@link ActionMapper} in to your struts.xml
 * configuration files. This means you can change your URL patterns at any point and your application will still work.
 * It is strongly recommended that if you are redirecting to another action, you use this result rather than the
 * standard redirect result.
**/

 

 

 

它的意思是建议我使用这种方式来作action的重定向：

 

<result name="error" type="redirectAction">
    <param name="actionName">Register</param>
    <param name="username">${username}</param>
</result>

"This means you can change your URL patterns at any point and your application will still work."

显然这句话是Struts2强烈推荐使用的原因，但是不太能理解这句话。

 

 

E文我是不懂啦！不过就我使用来看，这两种方法的区别之一是当变量是中文时，是否乱码的问题。
Register.action?username=${username}这种方式要传中文的话应该要设置下编码格式的。。。貌似是xml的东西啦。。。
至于还有没有其它区别!等待高人呢。。。

不是xml格式，历史原因，url传的文字最初是只能用iso8859的字符
其它的要用%20这种形式encode一下。

如果是用param标签，struts可以自动encode，而不需要自己写代码encode后传过去。
* because it does not require you to encode the URL patterns processed by the {@link ActionMapper} in to your struts.xml

原来如此。。。谢过。。。