Structs复习访问web元素

Structs帮我们在action和http里建立了联系

主要有四种方式我们主要用第二种（IOC 依赖容器注入）

Jar包

web.XML

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5"

    xmlns="http://java.sun.com/xml/ns/javaee"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

  <welcome-file-list>

    <welcome-file>index.jsp</welcome-file>

  </welcome-file-list>

  <filter>

        <filter-name>struts2</filter-name>

        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>

    </filter>

    <filter-mapping>

        <filter-name>struts2</filter-name>

        <url-pattern>/*</url-pattern>

    </filter-mapping>

</web-app>

Struct.xml(每次换类名

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"

    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

    <constant name="struts.devMode" value="true" />

    <package name="login" extends="struts-default" namespace="/login">

        <action name="login*" class="com.bjsxt.struts2.user.action.LoginAction{1}">

            <result>/user_login_success.jsp</result>

        </action>

    </package>

</struts>

拿的时候

index.jsp

<?xml version="1.0" encoding="GB18030" ?>

<%@ page language="java" contentType="text/html; charset=GB18030"

    pageEncoding="GB18030"%>

<% String context = request.getContextPath(); %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GB18030" />

<title>Insert title here</title>

</head>

<body>

取得Map类型request,session,application,真实类型 HttpServletRequest, HttpSession, ServletContext的引用:

<ol>

    <li>前三者：依赖于容器</li>

    <li>前三者：IOC</li> (只用这种)

    <li>后三者：依赖于容器</li>

    <li>后三者：IOC</li>

</ol>

<br />

<form name="f" action="" method="post">

用户名：<input type="text" name="name"/>

密码：<input type="text" name="password"/>

<br />

<input type="button" value="submit1" onclick="javascript:document.f.action='login/login1';document.f.submit();" />

<input type="button" value="submit2" onclick="javascript:document.f.action='login/login2';document.f.submit();" />

<input type="button" value="submit3" onclick="javascript:document.f.action='login/login3';document.f.submit();" />

<input type="button" value="submit4" onclick="javascript:document.f.action='login/login4';document.f.submit();" />

</form>

</body>

</html>

user_login_success.jsp

<?xml version="1.0" encoding="GB18030" ?>

<%@ page language="java" contentType="text/html; charset=GB18030"

    pageEncoding="GB18030"%>

    <%@taglib uri="/struts-tags" prefix="s" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GB18030" />

<title>Insert title here</title>

</head>

<body>

    User Login Success!

    <br />

    <s:property value="#request.r1"/> | <%=request.getAttribute("r1") %> <br />

    <s:property value="#session.s1"/> | <%=session.getAttribute("s1") %> <br />

    <s:property value="#application.a1"/> | <%=application.getAttribute("a1") %> <br />

    <s:property value="#attr.a1"/><br />     //不常用 无法精确的知道到底存在哪里 他是吧request application session 的全部存在里面

    <s:property value="#attr.s1"/><br />

    <s:property value="#attr.r1"/><br />

    <s:debug></s:debug>

    <br />

</body>

</html>

先介绍第一种‘

LoginAction1

package com.bjsxt.struts2.user.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() {

        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;

    }

}

第二种： IOC控制反转依赖于容器

LoginAction2

package com.bjsxt.struts2.user.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.ActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction2 extends ActionSupport implements RequestAware,SessionAware, ApplicationAware {

    private Map<String, Object> request;

    private Map<String, Object> session;

    private Map<String, Object> application;

    //DI dependency injection

    //IoC inverse of control

    public String execute() {

        request.put("r1", "r1");

        session.put("s1", "s1");

        application.put("a1", "a1");

        return SUCCESS;

    }

    @Override

    public void setRequest(Map<String, Object> request) {

        this.request = request;

    }

    @Override

    public void setSession(Map<String, Object> session) {

        this.session = session;

    }

    @Override

    public void setApplication(Map<String, Object> application) {

        this.application = application;

    }

}

第三种

LoginAction3

package com.bjsxt.struts2.user.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 = session.getServletContext();

    }

    public String execute() {

        request.setAttribute("r1", "r1");

        session.setAttribute("s1", "s1");

        application.setAttribute("a1", "a1");

        return SUCCESS;

    }

}

第四种 IOC

package com.bjsxt.struts2.user.action;

import javax.servlet.ServletContext;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSession;

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;

    public String execute() {

        request.setAttribute("r1", "r1");

        session.setAttribute("s1", "s1");

        application.setAttribute("a1", "a1");

        return SUCCESS;

    }

    @Override

    public void setServletRequest(HttpServletRequest request) {

        this.request = request;

        this.session = request.getSession();

        this.application = session.getServletContext();

    }

}

LoginAction4

Structs复习访问web元素的更多相关文章

Struts2 访问web元素
访问web元素的四种方法(耦合,依赖注入).(耦合,非依赖注入).(非耦合,依赖注入).(非耦合,非依赖注入) 耦合:可以得到HttpServletResponse,HttpServletReques ...
Struts2学习---简单的数据校验、访问Web元素
1.简单的数据校验在action里面我们已经给出了一个数据校验: public String execute() { if(user.getUsername().equals("usern ...
Struts2中访问web元素的四种方式
Struts2中访问web元素的四种方式如下: 通过ActionContext来访问Map类型的request.session.application对象. 通过实现RequestAware.Sess ...
01_12_Struts2_访问Web元素
01_12_Struts2_访问Web元素 1. 配置struts.xml文件 <package name="login" namespace="/login&qu ...
struts2 访问Web元素的4种方法
完整代码 :Struts12AccessWebElement.rar 第一种也是最常用的一种方法实现这几个接口 RequestAware,SessionAware,ApplicationAware s ...
sessionapplicationStruts2中访问web元素
本文是一篇关于sessionapplication的帖子取得Map类型request,session,application,实在类型 HttpServletRequest, HttpSession ...
Struts2访问web元素的各种方法
1.通过RequestAware,SessionAware,ApplicationAware获取: 在Struts2中不能直接访问Request,Session,Application元素,但是可以使 ...
Struts2 学习笔记 09 访问Web元素
我们想要访问Map类型request,session,application.真实类型HttpServletRequest,HttpSession,ServletContext的引用,并对它们进行操作 ...
Struts2_访问Web元素
取得Map 类型的 request,session,application, HttpServletRequest,HttpSession,ServletContext的引用. 分访问 Map 类型和 ...

随机推荐

第15课右值引用（2）_std::move和移动语义
1. std::move (1)std::move的原型 template<typename T> typename remove_reference<T>::type& ...
boost json序列化
json序列化 #ifndef FND_JSON_OBJECT_H #define FND_JSON_OBJECT_H #include <sstream> #include <bo ...
String.prototype.normalize()
normalize() 方法会按照指定的一种 Unicode 正规形式将当前字符串正规化. 这是一个ES6方法. 许多欧洲语言有语调符号和重音符号.为了表示它们,Unicode 提供了两种方法.一种是 ...
show processlist结果筛选(转)
在MySQL里面 show variables where variable_name like '%auto%' 这条语句可以正常执行,但是 show processlist where host ...
alias with parameter,linux
alias demoAlias1='_(){ git checkout -b $1; command2;}; _'
《机器学习实战》AdaBoost算法（手稿+代码）
Adaboost:多个弱分类器组成一个强分类器,按照每个弱分类器的作用大小给予不同的权重一.Adaboost理论部分 1.1 adaboost运行过程注释:算法是利用指数函数降低误差,运行过程通过 ...
python－性能测试
目录: 1.timeit 1.1 在命令后调用timeit 1.2 在代码中使用 1.3 创建计时器实例,通过autorange获得循环次数 1.4 Wall时间和CPU时间 2.profile和cP ...
mybatis-spring 集成
http://www.mybatis.org/spring/zh/index.html http://www.mybatis.org/mybatis-3/zh/java-api.html 编程API: ...
Getting started with C# and GDAL
Getting started with C# and GDAL http://vipassanaandenvironmentalinformatics.blogspot.jp/2013/03/get ...
wimform/对话框/Textbox基本方法
1.ColorDialog:颜色对话框 private void 颜色ToolStripMenuItem_Click(object sender, EventArgs e) { //对话框结果类型定义 ...

Structs复习 访问web元素

Structs复习 访问web元素的更多相关文章

随机推荐

热门专题

Structs复习访问web元素

Structs复习访问web元素的更多相关文章