action中访问request session application

前两种是取得Map类型的request,session,application  后两种是采用真实类型HttpServletReqeust,HttpSession,ServletContext
第一种方法依赖于容器 采用ActionContext即上下文的方式获取。jsp页面中采用原始的获取方式和<s:property value="#request.r1" />标签获取
package com.ouc.wkp.action;

import java.util.Map;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class LoginAction1 extends ActionSupport{
    
    private Map request;
    private Map session;
    private Map application;
    
    public LoginAction1(){
        //context  上下文   程序执行时周围的环境
        request=(Map) ActionContext.getContext().get("request");
        session=ActionContext.getContext().getSession();
        application=ActionContext.getContext().getApplication();
    }
    
    public String execute(){
        request.put("r1", "r1");
        session.put("s1", "s1");
        application.put("a1", "a1");
        return SUCCESS;
    }
}
LoginAction1
<body>
    User Login Success
    <s:debug></s:debug>
    <s:property value="#request.r1" /> \\ <%=request.getAttribute("r1") %>
    <s:property value="#session.s1" /> \\ <%=session.getAttribute("s1") %>
    <s:property value="#application.a1"/>\\<%=application.getAttribute("a1") %>
    <s:property value="#attr.a1"/>
  </body>
user_login_success.jsp
<form name="f" action="" method="post">
        <input type="text" name="username" /> <input type="text"
            name="password" /> <input type="button" value="submit1"
            onclick="javascript:document.f.action='login/login1';document.f.submit()" />
    </form>
login.jsp

<s:debug></s:debug>可以查看到很多信息   程序中的request会和Map型的request结合在一起

 

第二种方法ioc  

package com.ouc.wkp.action;

import java.util.Map;

import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction2 extends ActionSupport implements RequestAware,SessionAware,ApplicationAware{
    
    //设计模式
    //DI dependency injection
    //IOC inverse of control
    
    
    //Map和HttpRequest之间做了映射
    //依赖别人注入一个值
    private Map<String, Object> request;
    private Map<String, Object> session;
    private Map<String, Object> application;
    
    
    public String execute(){
        request.put("r1", "r2");
        session.put("s1", "s2");
        application.put("a1", "a2");
        return SUCCESS;
    }
    
    @Override
    public void setApplication(Map<String, Object> application) {
        this.application=application;
    }

    @Override
    public void setSession(Map<String, Object> session) {
        this.session=session;
    }

    @Override
    public void setRequest(Map<String, Object> request) {
        this.request=request;
    }

}
LoginAction2

 

第三种方法依赖于容器

package com.ouc.wkp.action;

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

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction3 extends ActionSupport{
    
    private HttpServletRequest request;
    private HttpSession session;
    private ServletContext application;
    
    public LoginAction3(){
        request=ServletActionContext.getRequest();
        session=request.getSession();
        application=request.getServletContext();
    }
    
    public String execute(){
        request.setAttribute("r1", "r3");
        session.setAttribute("s1", "s3");
        application.setAttribute("a1", "a3");
        return SUCCESS;
    }
}
LoginAction3

 

第四种方法ioc

package com.ouc.wkp.action;

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

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.ServletRequestAware;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction4 extends ActionSupport implements ServletRequestAware{
    
    private HttpServletRequest request;
    private HttpSession session;
    private ServletContext application;
    
    @Override
    public void setServletRequest(HttpServletRequest arg0) {
        request=ServletActionContext.getRequest();
        session=request.getSession();
        application=request.getServletContext();
    }
    
    public String execute(){
        request.setAttribute("r1", "r4");
        session.setAttribute("s1", "s4");
        application.setAttribute("a1", "a4");
        return SUCCESS;
    }
    
}
LoginAction4

 

其中第二种方法最常用

 

posted @ 2016-08-03 11:23  docyard  阅读(117)  评论(0)    收藏  举报