struts2总结五: Strut2 访问Servlet API-优快云博客

本文介绍如何在Struts2框架中通过不同方式将数据存入Session、Request和Application作用域，并展示了三种主要的方法：间接访问、IOC方式直接访问及直接访问。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

一、间接访问

public String execute() throws Exception {
        this.message="hello,this is put into application!";
        this.message2="hello,this is put into session!";
        this.message3="hello,this is put into request!";
        ActionContext  ac=ActionContext.getContext();
        //获取request级别的Map对象，把相关数据写入该对象中。
 ((Map<String ,Object>)ac.get("request")).put("message3", message3);
         //获取Application级别的Map对象，把相关数据写入该对象中。
          ac.getApplication().put("message", message);
        //获取sessiont级别的Map对象，把相关数据写入该对象中。
          ac.getSession().put("message2", message2);
        return SUCCESS;
}

二、直接访问（Ioc方式）

package com.bochy.struts2.action;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.ServletRequestAware;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class Hello extends ActionSupport implements ServletRequestAware{
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private HttpServletRequest request;
    private HttpSession session;
    private ServletContext application;
    private String message;
    private String message3;
     public String getMessage3() {
        return message3;
    }

    public void setMessage3(String message3) {
        this.message3 = message3;
    }

    public String getMessage2() {
        return message2;
    }

    public void setMessage2(String message2) {
        this.message2 = message2;
    }

    private String message2;
    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    @Override
    public String execute() throws Exception {
        this.message="hello,this is put into application!";
        this.message2="hello,this is put into session!";
        this.message3="hello,this is put into request!";
          this.request.setAttribute("message3", message3);
          this.session.setAttribute("message2", message2);
          this.application.setAttribute("message", message);
        return SUCCESS;
    }
    @Override
    public void setServletRequest(HttpServletRequest request) {
        this.request=request;
        this.session=this.request.getSession();
        this.application=this.session.getServletContext();
    }

}

三、 直接访问

package com.bochy.struts2.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 Hello extends ActionSupport {
    private static final long serialVersionUID = 1L;
    private String message;
    private String message3;
     public String getMessage3() {
        return message3;
    }

    public void setMessage3(String message3) {
        this.message3 = message3;
    }

    public String getMessage2() {
        return message2;
    }

    public void setMessage2(String message2) {
        this.message2 = message2;
    }

    private String message2;
    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    @Override
    public String execute() throws Exception {
        this.message="hello,this is put into application!";
        this.message2="hello,this is put into session!";
        this.message3="hello,this is put into request!";
        //调用ServletActionContext的getServletContext()获取Application对象
          ServletContext application=ServletActionContext.getServletContext();
        //调用ServletActionContext的getRequest()获取request对象
          HttpServletRequest request=ServletActionContext.getRequest();
         //调用ServletActionContext.getPageContext().getSession()获取session对象
          HttpSession session=ServletActionContext.getPageContext().getSession();
         // HttpSession session=request.getSession();
         request.setAttribute("message3", message3);
          session.setAttribute("message2", message2);
          application.setAttribute("message", message);
        return SUCCESS;
    }
}