Struts2 直接訪問Servlet API（二十五）

迎著太陽走向遠方發表於2017-03-27
原文網址 : https://blog.csdn.net/luobing_csdn/article/details/66969189
ServletAPI
1.通過IOC方式直接訪問Servlet API 

  在Struts2中，通過，Ioc方式將Serlvet物件注入到Action中，具體實現是一組介面覺得，要採用Ioc方式，必須在Action中實現一下介面：
ApplicationAware ：以Map型別向Action中注入儲存在ServletContext中的Attribute集合。
SessionAware： 以Map型別向Action注入儲存在HttpSerssoin中的Attribute集合
CookiesAwate：以Map型別向Action中注入Cookie中的資料集合。
ParameterAware：向Action中注入請求引數集合。


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>
   讀取session中的資訊:${sessionScope.login}
   讀取application中的資訊:${applicationScope.login}
  </body>


2.採用非IOC直接訪問Servlet API 

  除了ActionContext 類。Struts2還提供了名稱為ServletActionContext的輔助類來獲取Servlet API，這是非IOC的方式，其靜態方法有，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
	
}

其他的和上面一樣

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