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J2EE中使用Display标记库来展示表格

发表日期:2008-1-5


用网页展示表格时,假如行数太多,有时候需要把它们分成很多页.而且各行之间使用不同的背景色来方便用户阅读.或者可能还需要排序。虽然实现上面的功能都不难,但是假如使用Display标记库将能够大大简化开发.它模拟Google,baidu页面的风格,把许多行的表格分成各个页面,并提供了常用的功能。

  数据模型是很简单的美国总统JavaBean.它有3个简单的String属性。

  Java代码如下:

PagedData.java

import java.util.ArrayList;
import java.util.List;

public class PagedData {

 private List list;

 public PagedData( ) {
  list = new ArrayList( );
  list.add( new President( "Garfield", "James", "1881") );
  list.add( new President( "Arthur", "Chester", "1881-85") );
  list.add( new President( "Cleveland", "Grover", "1885-89") );
  list.add( new President( "Harrison", "Benjamin", "1889-93") );
  list.add( new President( "Cleveland", "Grover", "1893-97") );
  list.add( new President( "McKinley", "William", "1897-1901") );
  list.add( new President( "Roosevelt", "Theodore", "1901-09") );
  list.add( new President( "Taft", "William H.", "1909-13") );
  list.add( new President( "Wilson", "Woodrow", "1913-21") );
  list.add( new President( "Jackson", "Andrew", "1829-37") );
  list.add( new President( "Harding", "Warren", "1921-23") );
  list.add( new President( "Coolidge", "Calvin", "1923-29") );
  list.add( new President( "Hoover", "Herbert", "1929-33") );
  list.add( new President( "Roosevelt", "Franklin D.", "1933-45") );
  list.add( new President( "Truman", "Harry", "1945-53") );
  list.add( new President( "Eisenhower", "Dwight", "1953-61") );
  list.add( new President( "Kennedy", "John F.", "1961-63") );
  list.add( new President( "Johnson", "Lyndon", "1963-69") );
  list.add( new President( "Nixon", "Richard", "1969-74") );
  list.add( new President( "Ford", "Gerald", "1974-77") );
  list.add( new President( "Carter", "Jimmy", "1977-81") );
  list.add( new President( "Reagan", "Ronald", "1981-89") );
  list.add( new President( "Bush", "George H.W.", "1989-93") );
  list.add( new President( "Clinton", "William J.", "1993-2001") );
  list.add( new President( "Bush", "George W.", "2001-present") );
  list.add( new President( "Washington", "George", "1789-97") );
  list.add( new President( "Adams", "John", "1797-1801") );
  list.add( new President( "Jefferson", "Thomas", "1801-09") );
  list.add( new President( "Madison", "James", "1809-17") );
  list.add( new President( "Monroe", "James", "1817-25") );
  list.add( new President( "Jackson", "Andrew", "1829-37") );
  list.add( new President( "Van Buren", "Martin", "1837-41") );
  list.add( new President( "Harrison", "William Henry", "1841") );
  list.add( new President( "Tyler", "John", "1841-45") );
  list.add( new President( "Polk", "James", "1845-49") );
  list.add( new President( "Taylor", "Zachary", "1849-50") );
  list.add( new President( "Fillmore", "Millard", "1850-53") );
  list.add( new President( "Pierce", "Franklin", "1853-57") );
  list.add( new President( "BUChanan", "James", "1857") );
  list.add( new President( "Lincoln", "Abraham", "1861-65") );
  list.add( new President( "Johnson", "Andrew", "1865-69") );
  list.add( new President( "Grant", "Ulysses S.", "1869-77") );
  list.add( new President( "Hayes", "Rutherford B.", "1877-81") );
 }
 public List getData( ) {
  return list;
 }
}

President.java

public class President {
 public President(String lname, String fname, String term) {
  lastName = lname;
  firstName = fname;
  this.term = term;
 }

 public String getFirstName( ) {
  return firstName;
 }
 public void setFirstName(String firstName) {
  this.firstName = firstName;
 }
 public String getLastName( ) {
  return lastName;
 }
 public void setLastName(String lastName) {
  this.lastName = lastName;
 }
 public String getTerm( ) {
  return term;
 }
 public void setTerm(String term) {
  this.term = term;
 }

 private String lastName;
 private String firstName;
 private String term;
}

  下面的jsp页面是展示表格的,也体现了Display库最常见的用法:

index.jsp

<%@ page contentType="text/Html;charset=UTF-8" language="java" %>
<%@ taglib uri="http://displaytag.sf.net/el" prefix="display" %>
<html>
<head>
<title>Struts Cookbook - Chapter 4 : Display Tag Example</title>
<style>
.even {background-color:orange;}
.odd {background-color:yellow;}
</style>
</head>
<body>
<h2>Display Tag Examples</h2>
<jsp:useBean id="pagedData" class="PagedData"/>
<display:table id="pres" name="${pagedData.data}"
sort="list" pagesize="10" defaultsort="3">
<display:caption>United States Presidents</display:caption>
<display:setProperty name="basic.show.header" value="true"/>
<display:column property="firstName" title="First Name"
sortable="true"/>
<display:column property="lastName" title="Last Name"
sortable="true"/>
<display:column property="term" title="Term of Office"
sortable="true"/>
</display:table>
</body>
</html>

  在浏览器里打开页面:


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