常用的web元素有：request、session、application等，而我们一般使用session较多，struts2如何访问web元素呢？这个是非常重要的内容，因为它能完成程序后台和用户的数据交互，下面以注册为例演示其过程：
1、index.jsp文件
<%@ 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 public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <base href="<%=basepath %>"/> <title>insert title here</title> </head> <body> <h1>演示</h1> <form action="user/user02!register" method="post"> 姓名：<input type="text" name="user.name"></input> <br/> 密码：<input type="text" name="user.password"></input> <br/> <input type="submit" value="注册"/> </form> </body> </html>
功能很简单--即用户输入用户名和密码，然后后台可以获得，然后注册成功后显示给用户
2、struts.xml 配置
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<?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="front" namespace="/user" extends="struts-default">
<action name="user*" class="com.myservice.web.useraction{1}">
<result>/success.jsp</result>
<result name="error">/error.jsp</result>
</action>
</package>
</struts>
可以有两种方式完成这个功能
3、第一种（useraction01）
package com.myservice.web;
import java.util.map;
import com.opensymphony.xwork2.actioncontext;
import com.opensymphony.xwork2.actionsupport;
public class useraction01 extends actionsupport {
/**
*
*/
private static final long serialversionuid = 1l;
private user user;
private map request;
private map session;
private map application;
public useraction01(){
request = (map)actioncontext.getcontext().get("request");
session = actioncontext.getcontext().getsession();
application = actioncontext.getcontext().getapplication();
}
public string register(){
request.put("name", user.getname());
request.put("password", user.getpassword());
return success;
}
public user getuser() {
return user;
}
public void setuser(user user) {
this.user = user;
}
}
这个方式是用actioncontext.getcontext()方法获得context，然后得到request和session以及application
4、另外一种方式（useraction02）非常常见，也是非常著名的方式-----ioc（控制反转）和di（依赖注入），它需要实现3个接口如下：
package com.myservice.web;
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 useraction02 extends actionsupport implements requestaware, sessionaware,applicationaware{
private map<string, object> request;
private map<string, object> session;
private map<string, object> application;
private user user;
public user getuser() {
return user;
}
public void setuser(user user) {
this.user = user;
}
public string register(){
request.put("name", user.getname());
request.put("password", user.getpassword());
return success;
}
@override
public void setapplication(map<string, object> application) {
// todo auto-generated method stub
this.application = application;
}
@override
public void setsession(map<string, object> session) {
// todo auto-generated method stub
this.session = session;
}
@override
public void setrequest(map<string, object> request) {
// todo auto-generated method stub
this.request = request;
}
}
这样就实现了一个功能--将user的名称和密码都放入request中，在使用时我们只需取出即可
5、success.jsp将request中内容取出并显示
<%@ page language="java" contenttype="text/html; charset=utf-8" pageencoding="utf-8"%> <%@taglib uri="/struts-tags" prefix="s" %> <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <title>insert title here</title> </head> <body> <h3>成功注册</h3> <s:property value="#request.name"/>注册成功，密码为：<s:property value="#request.password"/> </body> </html>
其结果显示为：
以上就是struts2中访问web元素的全部内容，希望能给大家一个参考，也希望大家多多支持移动技术网。
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