struts2中采用容器实现资源共享，并并容器对象进行封装，降低与servletAPI的耦合性
操作方式：
- ActionContext
- ServletActionContext
- 实现接口
ActionContext
ActionContext属于Struts提供类,通过该类可以操作request,session,application容器,但是无法获得相关对象.Struts2对request,session,application容器进行了封装,因此可以通过ActionContext操作容器
特点: 可以实现对容器的操作,无法获得相关容器对象.降低了与Servlet的耦合度,操作Struts更加方便.
- 在web.xml中进行注册
<!-- 注册struts框架 -->
<filter>
<filter-name>mystruts</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>mystruts</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
- action中，使用了ActionContext
package action;
import com.opensymphony.xwork2.ActionContext;
public class TestAction1 {
public String byActionContext() {
System.out.println("TestAction1--byActionContext()!");
//操作容器: request,session,application
// 获取操作的对象，存放数据
ActionContext context = ActionContext.getContext();
context.put("req", "byActionContext--request容器");
context.getSession().put("sess", "byActionContext--session容器");
context.getApplication().put("app","byActionContext--application容器");
return "success";
}
}
- 在struts.xml中
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<package name="context" namespace="/" extends="struts-default">
<!-- byActionContext -->
<action name="byActionContext" class="action.TestAction1" method="byActionContext">
<result>/index.jsp</result>
</action>
</package>
</struts>
- 在test.html中访问资源
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
测试获得容器对象和操作容器 <br>
<a href="byActionContext">byActionContext </a>
</body>
</html>
- 访问完成后的index.jsp页面
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
获得容器中的数据. <br>
request容器: ${requestScope.req }<br>
session容器: ${sessionScope.sess }<br>
application容器: ${applicationScope.app }
</body>
</html>
ServletActionContext
手动获得相关对象
只需要在action和struts.xml中进行改变就可以了
- 在action中
package action;
public class TestAction2 {
public String byServletActionContext() {
System.out.println("TestAction2--byServletActionContext()!");
//获得request,session,application对象
HttpServletRequest request=ServletActionContext.getRequest();
HttpServletResponse respose=ServletActionContext.getResponse();
HttpSession session=request.getSession();
ServletContext application=ServletActionContext.getServletContext();
//向容器中放入数据
request.setAttribute("req", "byServletActionContext--request容器");
session.setAttribute("sess","byServletActionContext--session容器");
application.setAttribute("app", "byServletActionContext--application容器");
return "success";
}
}
- struts.xml中
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<package name="context" namespace="/" extends="struts-default"
<!-- byServletActionContext -->
<action name="byServletActionContext" class="action.TestAction2" method="byServletActionContext">
<result>/index.jsp</result>
</action>
</package>
</struts>
- test.html
<!-- ServletActionContext: 手动获得 原始对象 response -->
<a href="byServletActionContext">byServletActionContext</a>
实现接口
通过实现这几个接口重写这几个方法就可以了
自动获取相关对象
只需要在action和struts.xml中进行改变就可以了
- 在action中,实现这几个接口就可以了
package action;
public class TestAction3 implements ServletRequestAware,ServletResponseAware,ServletContextAware{
//当执行当前Action时,Struts2框架自动调用接口方法并传入相关参数
private HttpServletRequest request;
private HttpServletResponse response;
private ServletContext application;
private HttpSession session;
public void setServletContext(ServletContext application) {
this.application=application;
}
public void setServletResponse(HttpServletResponse response) {
this.response=response;
}
public void setServletRequest(HttpServletRequest request) {
this.request=request;
this.session=request.getSession();
}
public String byInterface() {
System.out.println("TestAction3--byInterface()!");
//向容器中存入数据
request.setAttribute("req", "byInterface--request容器");
session.setAttribute("sess","byInterface--session容器");
application.setAttribute("app", "byInterface--application容器");
return "success";
}
}
- struts.xml中
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<package name="context" namespace="/" extends="struts-default">
<!-- byInterface -->
<action name="byInterface" class="action.TestAction3" method="byInterface">
<result>/index.jsp</result>
</action>
</package>
</struts>
- test.html
<!-- 接口: 自动获得 原始对象 response
ServletRequestAware,ServletResponseAware,ServletContextAware
-->
<a href="byInterface">byInterface</a>
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