三 Struts2 添加返回数据

时间：2023-03-08 19:49:13

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>

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