struts2笔记(续七)

Struts标签:

TestTagsAction.java:

package com.oristand.actions;

 

import java.util.ArrayList;

import java.util.HashMap;

import java.util.HashSet;

import java.util.List;

import java.util.Map;

import java.util.Set;

 

import com.opensymphony.xwork2.ActionSupport;

 

public class TestTagsAction extends ActionSupport {

    private String username;

    private String password;

   

   

    public TestTagsAction() {

    }

    @Override

    public String execute() throws Exception {

       return SUCCESS;

    }

    public String getUsername() {

       return username;

    }

    public void setPassword(String password) {

       this.password = password;

    }

    public void setUsername(String username) {

       this.username = username;

    }

 

}

浏览器访问:http://localhost:8888/struts2_0100_OGNL/tags.action?username=u&password=p

 

Struts.xml:

<action name="tags" class="com.oristand.actions.TestTagsAction">

           <result>/tags.jsp</result>

 </action>

 

Tags.jsp:

 

1:<s:property>标签

 

  <li>value="username" is:   <s:property value="username"/></li>//输出结果为u,当作对象处理,ognl

   <li>value="'username'" is:  <s:property value="'username'"/></li>//

输出结果为username,当作字符串处理

   <li>value="admin" default="管理员"    <s:property value="admin" default="管理员"/></li>

   <li>【解析html标签 escape默认情况】<s:property value="'<hr/>'"/></li>//输出结果为<hr/>,默认是解析

   <li>【解析html标签 escape=false<s:property value="'<hr/>'" escape="false"/></li>//输出结果为一条横线,未解析

 

2<s:set/>标签

 

 

 一:

1:set标签的使用,set标签声明的变量的的范围默认是(requestActionContext),如【var="adminName" value="username"<br/>

   <s:set var="adminName" value="username"></s:set>

   <li>request取值【value="#request.adminName"】:<s:property value="#request.adminName"/></li>

  <li>ActionContext取值【value="#adminName"】:<s:property value="#adminName"/></li>

   <li>session取值【value="#session.adminName"】:<s:property value="#session.adminName"/></li>

   <li>application取值【value="#application.adminName"】:<s:property value="#application.adminName"/></li><br/>

   <br/>

 

这个运行的结果是(浏览器上):

·  1:set标签的使用,set标签声明的变量的的范围默认是(requestActionContext),如【var="adminName" value="username"

·  request取值【value="#request.adminName"】:user

·  ActionContext取值【value="#adminName"】:user

·  session取值【value="#session.adminName"】:

·  application取值【value="#application.adminName"】:

 

 

二:

2:指定set标签声明的变量的的范围,如【var="adminPassword1" value="password" scope="<font color="red">page</font>"<br/>

   <s:set var="adminPassword1" value="password" scope="page"></s:set>

   <li>【从page中取值,pageContext.getAttribute("adminPassword1")<%=pageContext.getAttribute("adminPassword1") %></li>

   <li>【从request中取值,value="#request.adminPassword1"<s:property value="#request.adminPassword1"/></li>

   <li>【从session中取值,value="#request.adminPassword1"<s:property value="#session.adminPassword1"/></li>

   <li>【从application中取值,value="#application.adminPassword1"<s:property value="#application.adminPassword1"/></li><br/><br/>

 

这个运行的结果是(浏览器上):

·  2:指定set标签声明的变量的的范围,如【var="adminPassword1" value="password" scope="page"

·  【从page中取值,pageContext.getAttribute("adminPassword1")pass

·  【从request中取值,value="#request.adminPassword1"

·  【从session中取值,value="#request.adminPassword1"

·  【从application中取值,value="#application.adminPassword1"

 

 

 

 三:

 指定set标签声明的变量的的范围,如【var="adminPassword2" value="password" scope="<font color="red">request</font>"<br/>

   <s:set var="adminPassword2" value="password" scope="request"></s:set>

   <li>【从page中取值,pageContext.getAttribute("adminPassword2")<%=pageContext.getAttribute("adminPassword2") %></li>

   <li>【从request中取值,value="#request.adminPassword2"<s:property value="#request.adminPassword2"/></li>

   <li>【从session中取值,value="#request.adminPassword2"<s:property value=Cou

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