Struts2 直接访问Servlet API(二十五)

1.通过IOC方式直接访问Servlet API
  在Struts2中,通过,Ioc方式将Serlvet对象注入到Action中,具体实现是一组接口觉得,要采用Ioc方式,必须在Action中实现一下接口:
ApplicationAware :以Map类型向Action中注入保存在ServletContext中的Attribute集合。
SessionAware: 以Map类型向Action注入保存在HttpSerssoin中的Attribute集合
CookiesAwate:以Map类型向Action中注入Cookie中的数据集合。
ParameterAware:向Action中注入请求参数集合。


1.action
package com.sh.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.interceptor.ServletRequestAware;

import com.opensymphony.xwork2.ActionSupport;

public class IocAction extends ActionSupport implements ServletRequestAware{
	private HttpServletRequest request;
	private String loginName;
	private String loginPassword;
	private String message;
	
	
	public String checkLogin(){
		HttpSession session=request.getSession();
		session.setAttribute("login", this.loginName);
		return SUCCESS;
	}
	
	public void setServletRequest(HttpServletRequest request) {
		// TODO Auto-generated method stub
		this.request=request;
	}
	// get set
}


strust.xml
<?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="default" extends="struts-default">
		<action name="iocAction" class="com.sh.action.IocAction" method="checkLogin">
			<result name="success">/success.jsp</result>
			<result name="login">/login.jsp</result>
		</action>
	</package>
    
</struts>



login.jsp
<body>
    <center>
    	<h3>
    		<s:text name="loginTitle"/>
    		${popedom}
    		${error}
    	</h3>
    	<s:form action="iocAction" method="post">
    		<s:textfield name="loginName" label="loginName" />
    		<s:textfield name="loginPassword" label="loginPassword"/>    	
    		<s:submit label="loginBtn" />
    		<s:token/>
    	</s:form>
    </center>
  </body>



success.jsp
<body>
   读取session中的信息:${sessionScope.login}
   读取application中的信息:${applicationScope.login}
  </body>


2.采用非IOC直接访问Servlet API
  除了ActionContext 类。Struts2还提供了名称为ServletActionContext的辅助类来获取Servlet API,这是非IOC的方式,其静态方法有,getPageContext(),getRequest(),getResponse,getServletContext().

package com.sh.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class noIocAction extends ActionSupport{
	
	private String loginName;
	private String loginPassword;
	private String message;
	
	public String checkLogin(){
		HttpServletRequest request=ServletActionContext.getRequest();
		HttpSession session=request.getSession();
		session.setAttribute("login", this.loginName);
		return SUCCESS;
	}
	
	//get set
	
}


其他的和上面一样

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