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Strtus2 Convention Plugin 配置规则

Jun 07, 2016 pm 03:14 PM
plugin Configuration

http://apps.hi.baidu.com/share/detail/22239197 1.官方介绍的地址: http://struts.apache.org/2.1.6/docs/convention-plugin.html 2.struts.xml文件配置 只挑选几个重要的常量说明: (1) constant name=struts.locale value=zh_CN/ constant name=struts.

http://apps.hi.baidu.com/share/detail/22239197

 

1.官方介绍的地址:

http://struts.apache.org/2.1.6/docs/convention-plugin.html


2.struts.xml文件配置

只挑选几个重要的常量说明:

(1)  
     

      struts2.1.6 现在只需要一个struts.xml文件就可以了。以前配struts.locale=zh_CN,struts.i18n.encoding=UTF-8,应用起动时会报一个警告,说没有配置locale,必须要在struts.properties里面配置才不会报错,现在这个问题已经解决了,所有配置都可以在xml文件中指定了。


(2)

      扩展名可以指定为空。这样地址栏比较好看。但也会有个问题,就是一些其他servlet映射,如cxf,我们会映射地址为/services/*,现在这个地址也变成struts2控制范围的地址了,如果按默认的配置会报找不到action的错误。解决办法是修改mapper类。这在以后文章中会提到。


(3)  
      

      开启动态方法。要实现零配置,就是需要动态方法调用。开启action名称可以有 “/”,一个请求地址有多个“/”,struts2就不会再使用类路径扫描的命名空间,只会使用配置的名称。所以既想action名称里使用“/”,又想用struts2默认搜索的命名空间,只能自己修改一下convention插件的实现类了。


(4)


(5)  
       
       
     

       开启开发者模式,在平时开发时修改action的annotation配置可以不重启,但是修改struts.xml文件还是要重启。修改类的具体内容,debug模式下可以不重启,或是使用javarebel,这个不在讨论范围。


(6)

      指定结果页面路径。 convention插件会自动在此路径中寻找文件。放到WEB-INF的目的的保护文件资源,只能通过程序内部跳转才能访问,我们的权限拦截器或其他权限处理只要加到action上就可以了。


(7)  
      
    

     一个action名字的获取。比如为HelloWorldAction。按照配置,actionName为hello_world。


(8)

     是否不扫描类。一定要设为false,否则convention插件不起作用,零配置也没有意义。


(9)

     设置默认的父包,一般我们都设置一个default包继承自struts-default。大部分类再继承default。如果有特殊的类需要特殊的包,只能在action中再指定父包了。


(10)  
        
      

   确定搜索包的路径。只要是结尾为action的包都要搜索。basePackage按照默认不用配置,如果配置,只会找以此配置开头的包。locators及locators.basePackage都是一组以逗号分割的字符串。


(11)

   排除哪些包不搜索。按默认配置即可。逗号分割字符串。


(12)

   包括哪些jar包中的action。逗号分割字符串。


(13)

   默认返回的结果类型搜索。按顺序先找相关的dispatcher的jsp文件是否存在。然后再找freemarker,再找velocity。


(14)

      如果此值设为true,如果一个action的命名空间为/login,名称为HelloWorldAction。result返回值是success,默认会找到/WEB-INF/pages/login/hello_world.jsp(如果有hello_world_success.jsp就找这个文件,连接符“_”是在中配置的)。如果有一个action的result返回值是“error”,就会找/WEB-INF/pages /login/hello_world_error.jsp。

      如果此值设为false,如果一个action的命名空间为/login,名称为HelloWorldAction。result返回值是success,默认会找到/WEB- INF/pages/login/hello_world/index.jsp(如果有success.jsp就找这个文件)。如果有一个action的result返回值是“error”,就会找/WEB-INF/pages /login/hello_world/error.jsp。


(15)  
        
     
   

      这几个配置没有太多的实际意义,本着最小检查的原则就可以。


(16)默认拦截器配置,已经简化了许多,一般不需要chain和 fileupload。modelDriven也没什么用,如果我们要使用restfull插件会有用。其实最简单只要一个params就可以了。我加入 exception是为了开发时的异常。servletConfig是为了包装一下request,reponse等对象,staticParams是为了可以配置${}形式参数。actionMappingParams是struts2.1新增的,我初步认为是可以在action配置中传参数,这个还有些疑问。

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