三 Struts2 添加返回数据

一。struts2如何获取servletAPI
1.解耦和的方式获取封装后的Map对象，这种获取的map对象只有存取数据的功能.
　　Map request = (Map) ActionContext.getContext().get("request");
　　//获取session的map封装对象
　　Map session = ActionContext.getContext().getSession();
　　//获取application的map封装对象
　　Map application = ActionContext.getContext().getApplication();
2.非解耦和拿到实际的httpservlet的API，这样拿到的对象具有原来本身的功能.
　　//获取httpservletrequest
　　HttpServletRequest req = ServletActionContext.getRequest();
　　//HttpServletResponse
　　HttpServletResponse resp = ServletActionContext.getResponse();
　　//获取httpSession
　　HttpSession sess = req.getSession();
　　//获取Application
　　ServletContext app = ServletActionContext.getServletContext();

3.IOC（反转控制）的方式获取，实现特定接口(如RequestAware,SessionAware,ApplicationAware,ServletRequestAware,ServletResponseAware,ServletContextAware接口)，然后给属性相应的set方法就能注入对象.

二。action中的重定向
　　就是把struts.xml中的result的type属性设置为：redirect

　　login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html>
<html>
<head>
<base href="<%=basePath%>"/>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <form action="login" method="post">
        用户名:<input name="username"><br>
        密码:<input type="password" name="pwd"><br>
        <input type="submit" value="提交">
    </form>
</body>
</html>

　　LoginAction.java

package com.action;

import java.util.Map;

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

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import org.apache.struts2.interceptor.SessionAware;
import org.apache.struts2.util.ServletContextAware;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ModelDriven;
import com.pojo.User;

public class LoginAction implements ModelDriven<User>,RequestAware,SessionAware,ApplicationAware,ServletRequestAware,ServletResponseAware,ServletContextAware{
    //1.用属性绑定参数
//    String username;
//    String pwd;
//    
//    public String getUsername() {
//        return username;
//    }
//
//    public void setUsername(String username) {
//        this.username = username;
//    }
//
//    public String getPwd() {
//        return pwd;
//    }
//
//    public void setPwd(String pwd) {
//        this.pwd = pwd;
//    }
    
    //2.用pojo对象绑定页面参数
//    User user;
//
//    public User getUser() {
//        return user;
//    }
//
//    public void setUser(User user) {
//        this.user = user;
//    }
    
    //3.用pojo对象绑定，用ModelDriver接口来实现
    User user = new User();
    @Override
    public User getModel() {
        return user;
    }
    
    //三。注入servletAPI对象
    Map request;
    Map session;
    Map application;
    HttpServletRequest servletRequest;
    HttpServletResponse servletResponse;
    ServletContext servletContext;
    
    public void setRequest(Map request) {
        this.request = request;
    }
    
    public void setSession(Map session) {
        this.session = session;
    }
    
    public void setApplication(Map application) {
        this.application = application;
    }

    public void setServletRequest(HttpServletRequest servletRequest) {
        this.servletRequest = servletRequest;
    }

    public void setServletResponse(HttpServletResponse servletResponse) {
        this.servletResponse = servletResponse;
    }

    public void setServletContext(ServletContext servletContext) {
        this.servletContext = servletContext;
    }

    public String execute(){
        System.out.println("username="+user.getUsername()+"pwd="+user.getPwd());

        //一。获取被封装后的servletAPI
        //1.获取request被封装后的map对象
        Map req = (Map) ActionContext.getContext().get("request");
        req.put("user", user);
        //2.获取session本封装后的map对象
        Map session = ActionContext.getContext().getSession();
        session.put("user", user);
        //3.获取application被封装后的map对象
        Map app = ActionContext.getContext().getApplication();

        //二。获取原servletAPI
        HttpServletRequest req = ServletActionContext.getRequest();
        HttpServletResponse resp = ServletActionContext.getResponse();
        HttpSession sess = req.getSession();
        ServletContext applicatipn = ServletActionContext.getServletContext();

        System.out.println("请求的ip地址是："+req.getRemoteAddr()+"||"+req.getRemoteHost());

        return "success";
    }
}

　　success.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html>
<html>
<head>
<base href="<%=basePath%>"/>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    欢迎${user.username }登录
</body>
</html>

　　struts.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="my" namespace="/" extends="struts-default">
        <action name="login" class="com.action.LoginAction">
            <result name="success" type="redirect">/jsp/success.jsp</result>
        </action>
    </package>
</struts>

 

posted @ 2019-04-28 10:03  五柳先生柳三变  阅读(322)  评论(0)  编辑  收藏  举报