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Struts2的一些常量和含义的应用
2012-02-02 18:21:23           
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首先,当我们学习一个框架的时,一般可以参考框架自带的示例项目。例如struts2,刚入门的时候,可以参考其自带的blank项目。当部署完这个项目后,开启tomcat服务,在地址栏里输入请求的action路径时,可以发现,虽然没有给该action定义扩展名,但是地址里输入的action路径没有扩展名或者扩展名为action时都可以通过。为什么呢?这是由struts2的默认配置属性决定的。
 
 
 
常量的默认配置在struts2-core-2.1.8.1/org/apache/struts2/default.properties文件里,像定义访问action的默认扩展名、开发模式设置、i18n以及默认字符编码等等,例如struts.action.extension=action,,。
 
 
 
应当注意的是,一般情况不要修改框架系统的原始文件,如果要更改默认的配置项,可以采用覆盖的方式。struts.xml是struts2的基本配置文件之一。该文件内可以配置多个常量,以覆盖默认的常量配置,例如<constant name="struts.action.extension" value="do,," />表示action的可用扩展名为do或者不用扩展名。
 
 
 
常量可以在下面多个文件中进行定义,struts2加载常量的搜索顺序如下,后面的设置可以覆盖前面的设置:
default.properties文件
struts-default.xml
struts-plugin.xml
struts.xml
struts.properties(为了与webwork向后兼容而提供)
web.xml
 
 
 
下面列举几个常用的常量
 
 
### This can be used to set your default locale and encoding scheme 
# struts.locale=en_US 
struts.i18n.encoding=UTF-8//指定默认编码 
### This can be used to set your default locale and encoding scheme
# struts.locale=en_US
struts.i18n.encoding=UTF-8//指定默认编码
 
 
 
 
# uses javax.servlet.context.tempdir by default 
struts.multipart.saveDir= 
struts.multipart.maxSize=2097152//上传文件大小限制 
# uses javax.servlet.context.tempdir by default
struts.multipart.saveDir=
struts.multipart.maxSize=2097152//上传文件大小限制
 
 
 
 
### Used by the DefaultActionMapper 
### You may provide a comma separated list, e.g. struts.action.extension=action,jnlp,do 
### The blank extension allows you to match directory listings as well as pure action names 
### without interfering with static resources. 
struts.action.extension=action,,//指定处理请求的后缀 
### Used by the DefaultActionMapper
### You may provide a comma separated list, e.g. struts.action.extension=action,jnlp,do
### The blank extension allows you to match directory listings as well as pure action names
### without interfering with static resources.
struts.action.extension=action,,//指定处理请求的后缀
 
### Used by FilterDispatcher 
### This is good for development where one wants changes to the static content be 
### fetch on each request. 
### NOTE: This will only have effect if struts.serve.static=true 
### If true -> Struts will write out header for static contents such that they will 
###             be cached by web browsers (using Date, Cache-Content, Pragma, Expires) 
###             headers). 
### If false -> Struts will write out header for static contents such that they are 
###            NOT to be cached by web browser (using Cache-Content, Pragma, Expires 
###            headers) 
struts.serve.static.browserCache=true// www.2cto.com 指定是否缓存静态资源,开发的时候最好关闭 
### Used by FilterDispatcher
### This is good for development where one wants changes to the static content be
### fetch on each request.
### NOTE: This will only have effect if struts.serve.static=true
### If true -> Struts will write out header for static contents such that they will
###             be cached by web browsers (using Date, Cache-Content, Pragma, Expires)
###             headers).
### If false -> Struts will write out header for static contents such that they are
###            NOT to be cached by web browser (using Cache-Content, Pragma, Expires
###            headers)
struts.serve.static.browserCache=true//指定是否缓存静态资源,开发的时候最好关闭
 
### when set to true, Struts will act much more friendly for developers. This 
### includes: 
### - struts.i18n.reload = true 
### - struts.configuration.xml.reload = true 
### - raising various debug or ignorable problems to errors 
###   For example: normally a request to foo.action?someUnknownField=true should 
###                be ignored (given that any value can come from the web and it 
###                should not be trusted). However, during development, it may be 
###                useful to know when these errors are happening and be told of 
###                them right away. 
struts.devMode = false//开发时候设置为trus可以开发出更加详细的信息 
### when set to true, Struts will act much more friendly for developers. This
### includes:
### - struts.i18n.reload = true
### - struts.configuration.xml.reload = true
### - raising various debug or ignorable problems to errors
###   For example: normally a request to foo.action?someUnknownField=true should
###                be ignored (given that any value can come from the web and it
###                should not be trusted). However, during development, it may be
###                useful to know when these errors are happening and be told of
###                them right away.
struts.devMode = false//开发时候设置为trus可以开发出更加详细的信息
 
### Standard UI theme 
### Change this to reflect which path should be used for JSP control tag templates by default 
struts.ui.theme=xhtml//设置默认视图,最好为simple 
### Standard UI theme
### Change this to reflect which path should be used for JSP control tag templates by default
struts.ui.theme=xhtml//设置默认视图,最好为simple
 
### Configuration reloading 
### This will cause the configuration to reload struts.xml when it is changed 
struts.configuration.xml.reload=false//设置为True一旦Struts.xml文件修改就自动加载


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