使用Struts2 的ValueStack，来实现数据显示在页面上

Model层的：

GetBooks.java

package practice.model;

public class BookService
{
    private String[] books = new String[]
        {
            "Spring2.0宝典",
            "化工大法",
            "如来神掌",
            "大话西游"
        };
    public String[] getLeeBooks()
    {
        return books;
    }
}

Controller层的:

GetBooksAction.java

package practice.structs2;
import com.opensymphony.xwork2.ActionContext;

import practice.model.*;

public class GetBooksAction implements Action
{
    private String[] books;
    public void setBooks(String[] books)
    {
        this.books = books;
    }
    public String[] getBooks()
    {
        return books;
    }
    public String execute() throws Exception
    {
        String user = (String)ActionContext.getContext().getSession().get("user");
        if(null != user && user.equals("hello"))
        {
            BookService bs = new BookService();
            setBooks(bs.getLeeBooks());
            return SUCCESS;
        }
        else
        {
            return LOGIN;
        }
    }
}

structs.xml 的配置：

<action name="GetBooks" class="practice.structs2.GetBooksAction">
            <result name="login" >/login.jsp</result>
            <result name="success" >/showBook.jsp</result>
        </action>

showBook.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page language="java" import="com.opensymphony.xwork2.util.*" %>

<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">
    <title>作者李刚的书</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">

</head>
<body>
<%

        //在Struts中ValueStack 可以把Action中定义的变量，提取到页面上
        ValueStack vs = (ValueStack)request.getAttribute("struts.valueStack");
        String[] books = (String[])vs.findValue("books");
        for(String book : books)
        {
        %>
            <%= book %><br/>
        <%
        }
     %>
</body>
</html>

使用控件改良后的showBook.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page language="java" import="com.opensymphony.xwork2.util.*" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">
    <title>My JSP 'showBook2.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">

</head>
<body>
图书信息：
    <s:iterator value="books" status="index">
        <s:if test="#index.odd == true">
            <div style="background-color:#c8c8c8;width=400px;" ><s:property/></div>
        </s:if>
        <s:else>
            <div style="background-color:#fff;width=400px;" ><s:property/></div>
        </s:else>
    </s:iterator>
</body>
</html>

posted on 2011-10-12 15:23 冰危节奏阅读(1402) 评论(0) 收藏举报

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使用Struts2 的ValueStack，来实现数据显示在页面上

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