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displaytag 插件的简单使用介绍

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我们学习一个开源的插件的最好方法就是，搭建一个工程，用一个简单用例来使用它。

我使用的它的简单过程如下：

第一步：在myeclispe中创建一个web project
第二步：把用到的jar:commons-beanutils.jar,commons-collections.jar,commons-lang-2.1.jar,commons-logging.jar,displaytag-1.1.jar放的lib下
第三步：建个jsp文件代码如下：
     
<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%@ taglib uri="http://displaytag.sf.net" prefix="display" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html lang="true">
  <head>
    <html:base />
    
    <title>displaytag_list.jsp</title>
 
	
<% 
 List test = new ArrayList( 6 );
 
 HashMap map=new HashMap();
  HashMap map1=new HashMap();
  map.put("id",new Integer(322));
 map.put("name","ybc");
  map.put("id1","322");
 map.put("name1","ybc");
  map.put("id2","322");
 map.put("name2","ybc");
  map1.put("id",new Integer(300));
 map1.put("name","yccc");
  map1.put("id1","322");
 map1.put("name1","ycc");
  map1.put("id2","322");
 map1.put("name2","ycc");
 test.add(map);
 test.add(map1); //[size=large]在实际使用的时候可以从数据库中取数据[/size]
 
 request.setAttribute( "test", test ); 
%>

  </head>
  
  <body  style="background-position:right bottom;background-repeat:no-repeat; 

background-attachment:fixed;">

<display:table id="row" name="test" pagesize="1" class="simple" export="true" 

decorator="com.Wrap"  varTotals="totals">

  <display:column property="id" title="ID"  total="true" />
  <display:column property="name" title="姓名" headerClass="sortable" />
 <display:column property="id1" title="ID" titleKey="sssssss" 

headerClass="sortable"  />
  <display:column property="name1" title="姓名" headerClass="sortable" />
  <display:column property="id2" title="ID" titleKey="sssssss" 

headerClass="sortable"  />
  <display:column property="name2" title="姓名" headerClass="sortable" />
  <display:column property="link" title="操作" titleKey="se" 

headerClass="sortable" media="html"/>
      <display:footer>
  	<tr>
  		
  		<td>${totals.column1}</td>
  	<tr>
  </display:footer>
</display:table>
	  	
	  	
  </body>
  
 
</html:html>


第四步：建个java文件用于上面 decorator="com.Wrap" （表示放在com包下）
        源码如下：
package com;


import org.displaytag.decorator.TableDecorator;


public class Wrap extends TableDecorator {
	/**
     * Creates a new Wrapper decorator who's job is to reformat some of the 

data located in our JcglSagg.
     */
    public Wrap()
    {
        super();
    } 

    /**
     * Test method which always returns a null value.
     * @return <code>null</code>
     */
    public String getNullValue()
    {
        return null;
    }

    /**
     * Returns an "action bar" of sorts that allow the user to perform 

various actions on the JcglSagg based on it's
     * id.
     * @return String
     */
    public String getLink()
    {
       
        return "<a href='http://localhost:2008/' target='blank'>link</a>";
        
    }
    
}

第五步:配置web.xml文件
    
  <?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
	xmlns="http://java.sun.com/xml/ns/j2ee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	
	<filter> 
	<filter-name>exportFilter</filter-name> 
	<filter-class>org.displaytag.filter.ResponseOverrideFilter</filter-

class> 
  </filter>
   
  
  
   <welcome-file-list>
  	<welcome-file>test.jsp</welcome-file>
  </welcome-file-list>
    
</web-app>


第六步：发布到web服务器上（我用的是tomcat6）


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