用eXtremeComponents做分页-简单方便
eXtremeComponents是提供更高级数据显示的开源JSP标签,用于以表格的形式来显示数据,它的功能强大且使用简单,常用的功能包括排序、分页、导出Excel与pdf等。使用ExtremeComponents列表组件,你需要去http://sourceforge.net/projects/extremecomp/下载发布的压缩包文件。不过现在更推荐使用javaEye里的GT-Grid ( 原名叫EC Side ), 地址:http://ecside.group.iteye.com/ ,大家可以去那里学习与讨论。
EC Side也是一个开源的列表组件,他是源自于开源列表组件 eXtremeComponents,不过已经早已脱离了eXtremeComponents而独立发展(里面仍有部分代码是来自 eXtremeComponents)。青出于蓝而胜于蓝,EC Side比eXtremeComponents的功能更强大。一般我们建议先学习和使用一下eXtremeComponents,再去学习和使用EC Side.
以下是一个eXtremeComponents使用的示例,用来演示一下ExtremeComponents列表组件进行数据库数据分页显示的使用,更多跟深入的学习,您可以参考http://www.blogjava.net/lucky/articles/33380.html 或者http://blog.chinaunix.net/u/7893/showart_426623.html。
完成下面的示例,需要按照如下的步骤进行:
先把一些准备工作做好,在MyEclipse新建web工程,在下载的ExtremeComponents压缩包中找到
commons-beanutils 1.7
commons-collections 3.0
commons-lang 2.0
commons-logging 1.0.4
standard 1.0.2
extremecomponents-1.0.1.jar
将以上jar包和extremecomponents.tld文件拷贝到WEB-INF/lib目录下,并且把images整个文件夹拷贝到WebRoot下,以上的所有的jar包和文件都在下载的压缩包里可以找到,至此准备工作就完成了 。
1、建立数据库数据:
create database page;
use page;
create table student
(
stu_id integer auto_increment,
stuName varchar(255) not null,
address varchar(255) not null,
stuPhone varchar(255)not null,
primary key(stu_id)
);
insert into student(stuName,address,stuPhone) values('杨老板,'长沙','13787825190');
insert into student(stuName,address,stuPhone) values('王老板,'大连','13782251560');
这里可以复制上面的insert语句多插入几行不同的数据.
2、写一个类StudDAO.java来操作数据库,从数据库中取出数据,该类的代码如下:
- package org.hnylj.eXtreme;
- import java.sql.Connection;
- import java.sql.DriverManager;
- import java.sql.PreparedStatement;
- import java.sql.ResultSet;
- import java.sql.SQLException;
- import java.sql.Statement;
- import java.util.ArrayList;
- import java.util.HashMap;
- import java.util.List;
- import java.util.Map;
- public class StudDAO {
- private Connection conn = null ;
- private Statement stmt = null ;
- private PreparedStatement pstmt = null ;
- private ResultSet rs = null ;
- private static final String DRIVER = "com.mysql.jdbc.Driver" ;
- private static final String URL = "jdbc:mysql://localhost:3306/page" ;
- private static final String USERNAME = "root" ;
- private static final String PASSWORD = "123" ;
- private List<Map<String,String>> list = new ArrayList<Map<String,String>>() ;
- private Map<String,String> map = null ;
- public StudDAO () {
- }
- //数据库连接
- public synchronized Connection getConnection () {
- try {
- Class.forName (DRIVER) ;
- conn = DriverManager.getConnection (URL,USERNAME,PASSWORD) ;
- } catch (ClassNotFoundException e) {
- e.printStackTrace () ;
- return null ;
- } catch (SQLException e) {
- e.printStackTrace () ;
- return null ;
- }
- return conn ;
- }
- public List<Map<String,String>> query () {
- try {
- if (this.getConnection()!=null) {
- pstmt = this.getConnection().prepareStatement("select * from student") ;
- rs = pstmt.executeQuery () ;
- while (rs.next()) {
- map = new HashMap<String,String>() ;
- map.put("stuName", rs.getString("stuName")) ;
- map.put("address", rs.getString("address")) ;
- map.put("stuPhone", rs.getString("stuPhone")) ;
- list.add(map) ;
- }
- }
- } catch(SQLException e) {
- e.printStackTrace() ;
- }
- return list ;
- }
- }
3、编写一个jsp页面,用来显示数据,其代码如下:
- <%@ page language="java" import="java.util.*,org.hnylj.eXtreme.*"
- pageEncoding="gb2312"%>
- <%@ taglib uri="WEB-INF/extremecomponents.tld" prefix="ec"%>
- <html>
- <head>
- <title>用extremecomponents分页</title>
- <style type="text/css">
- .eXtremeTable {
- margin: 0;
- padding: 0;
- }
- .eXtremeTable select {
- font-family: Verdana;
- font-size: 9px;
- border: solid 1px #EEE;
- width: 75px;
- }
- .eXtremeTable .tableRegion {
- border: 1px solid silver;
- padding: 2px;
- font-family: Verdana;
- font-size: 10px;
- margin-top: 7px;
- }
- .eXtremeTable .filter {
- background-color: #efefef;
- }
- .eXtremeTable .filter input {
- font-family: Verdana;
- font-size: 10px;
- width: 100%;
- }
- .eXtremeTable .filter select {
- font-family: Verdana;
- font-size: 9px;
- border: solid 1px #EEE;
- width: 100%;
- }
- .eXtremeTable .tableHeader {
- background-color: #308dbb;
- color: white;
- font-family: Verdana;
- font-size: 11px;
- font-weight: bold;
- text-align: left;
- padding-right: 3px;
- padding-left: 3px;
- padding-top: 4;
- padding-bottom: 4;
- margin: 0;
- border-right-style: solid;
- border-right-width: 1px;
- border-color: white;
- }
- .eXtremeTable .tableHeaderSort {
- background-color: #3a95c2;
- color: white;
- font-family: Verdana;
- font-size: 11px;
- font-weight: bold;
- text-align: left;
- padding-right: 3px;
- padding-left: 3px;
- padding-top: 4;
- padding-bottom: 4;
- border-right-style: solid;
- border-right-width: 1px;
- border-color: white;
- }
- .eXtremeTable .odd a,.even a {
- color: Black;
- font-size: 10px;
- }
- .eXtremeTable .odd td,.eXtremeTable .even td {
- padding-top: 2px;
- padding-right: 3px;
- padding-bottom: 2px;
- padding-left: 3px;
- vertical-align: middle;
- font-family: Verdana;
- font-size: 10px;
- }
- .eXtremeTable .odd {
- background-color: #FFFFFF;
- }
- .eXtremeTable .even {
- background-color: #dfe4e8;
- }
- .eXtremeTable .highlight td {
- color: black;
- font-size: 10px;
- padding-top: 2px;
- padding-right: 3px;
- padding-bottom: 2px;
- padding-left: 3px;
- vertical-align: middle;
- background-color: #fdecae;
- }
- .eXtremeTable .highlight a,.highlight a {
- color: black;
- font-size: 10px;
- }
- .eXtremeTable .toolbar {
- background-color: #F4F4F4;
- font-family: Verdana;
- font-size: 9px;
- margin-right: 1px;
- border-right: 1px solid silver;
- border-left: 1px solid silver;
- border-top: 1px solid silver;
- border-bottom: 1px solid silver;
- }
- .eXtremeTable .toolbar td {
- color: #444444;
- padding: 0px 3px 0px 3px;
- text-align: center;
- }
- .eXtremeTable .separator {
- width: 7px;
- }
- .eXtremeTable .statusBar {
- background-color: #F4F4F4;
- font-family: Verdana;
- font-size: 10px;
- }
- .eXtremeTable .filterButtons {
- background-color: #efefef;
- text-align: right;
- }
- .eXtremeTable .title {
- color: #444444;
- font-weight: bold;
- font-family: Verdana;
- font-size: 15px;
- vertical-align: middle;
- }
- .eXtremeTable .title span {
- margin-left: 7px;
- }
- .eXtremeTable .formButtons {
- display: block;
- margin-top: 10px;
- margin-left: 5px;
- }
- .eXtremeTable .formButton {
- cursor: pointer;
- font-family: Verdana;
- font-size: 10px;
- font-weight: bold;
- background-color: #308dbb;
- color: white;
- margin-top: 5px;
- border: outset 1px #333;
- vertical-align: middle;
- }
- .eXtremeTable .tableTotal {
- background-color: #FFFFFF;
- border-top: solid 1px Silver;
- }
- .eXtremeTable .tableTotalEmpty {
- background-color: #FFFFFF;
- }
- </style>
- </head>
- <body style="margin: 25px;">
- <%
- StudDAO studDAO = new StudDAO() ;
- List<Map<String,String>> list = studDAO.query() ;
- request.setAttribute("studList", list) ;
- %>
- <ec:table items="studList"
- action="${pageContext.request.contextPath}/result.jsp"
- imagePath="${pageContext.request.contextPath}/images/table/*.gif"
- title="学员信息表" width="60%" rowsDisplayed="5">
- <ec:row>
- <ec:column property="stuName" />
- <ec:column property="address" />
- <ec:column property="stuPhone" />
- </ec:row>
- </ec:table>
- </body>
- </html>
4、部署整个web工程到Tomcat下,启动Tomcat,在浏览器中输入:
http://localhost:8080/eXtremeDemo/result.jsp
至此,就可以在页面中看到从数据库中查询出来的数据,而且自动进行了分页显示,有上一页,下一页,首页,末页,这样给我们剩去了很多进行分页显示的代码,在不做其他考虑的情况下,使用该组件大大提高了工作的效率。
(只是一个举例,代码写得有点乱,重在了解如何使用该组件)