Struts2配置文件-struts.xml

struts.xml配置文件结构如下：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<bean class="" name="" scope="" optional="" static="" type=""></bean>
<constant name="" value="" ></constant>
<include file="" ></include>
<package name="" namespace="" extends="" abstract="" externalReferenceResolver="">
	<action name="" class="" converter="" method=""></action>
	<default-action-ref name=""></default-action-ref>
	<default-class-ref class=""></default-class-ref>
	<default-interceptor-ref name=""></default-interceptor-ref>
	<global-exception-mappings>
		<exception-mapping result="" exception="" name="">
			<param name=""></param>
		</exception-mapping>
	</global-exception-mappings>
	<global-results>
		<result name="" type=""><param name=""></param></result>
	</global-results>
	<interceptors>
		<interceptor name="" class="">
			<param name=""></param>
		</interceptor>
		<interceptor-stack name="">
			<interceptor-ref name="">
				<param name=""></param>
			</interceptor-ref>
		</interceptor-stack>
	</interceptors>
	<result-types>
		<result-type name="" class="" default="false">
			<param name=""></param>
		</result-type>
	</result-types>
</package>
</struts>

1、bean节点

引用

http://struts.apache.org/2.x/docs/bean-configuration.html

Attribute	Required	Description
class	yes	the name of the bean class
type	no	the primary Java interface this class implements
name	no	the unique name of this bean; must be unique among other beans that specify the same type
scope	no	the scope of the bean; must be either default, singleton, request, session, thread
static	no	whether to inject static methods or not; shouldn't be true when the type is specified
optional	no	whether the bean is optional or not

bean元素需要class属性指定要被创建或者使用的java类，一个java bean1可能是以下两种：
a、被框架的容器创建然后注入到框架的内部对象
       对象注入方式，通常伴随着type属性，告诉容器这个java bean实现了哪个接口
b、使用值注入到自身的静态方法中
      值注入方式，对于允许不是容器创建的对象去接收框架的常量来说是不错的.对象使用值注入必须定义静态属性