使用DWR 轻轻松松实现Ajax实现分页
来源：程序员人生 发布时间：2013-12-22 09:49:15 阅读次数：2653次
建站学院（LieHuo.Net）文档 本教程中是以DWR(AJAX的一种Java实现)做的分页!
1.以下是DWR的配置
(1)在web.xml中配置DWRServlet如下：
以下为引用的内容：
<servlet>
<servlet-name>dwr-invoker</servlet-name>
<display-name>DWR Servlet</display-name>
<description>Direct Web Remoter Servlet</description>
<servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>true</param-value>
</init-param>
</servlet> <servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping> |
(2)在dwr.xml中配置
以下为引用的内容：
<dwr>
<allow>
<create javascript="GetPages" creator="new">
<param name="class" value="com.GetPages"></param>
</create>
<convert match="com.PageBean" converter="bean">
<param name="include" value="job_id,job_desc,min_lvl,max_lvl"></param>
</convert>
</allow>
</dwr> |
2.编写PageBean以存放要显示的数据
以下为引用的内容：
private String job_id;
private String job_desc;
private String min_lvl;
private String max_lvl; |
3.编写getPage类实现分页,代码如下:
以下为引用的内容：
public int getFirst(int page)
{
pages=page;
return pages;
}
public int getNext(int page)
{
if(page==pageCount)
{
return pageCount;
}else
{
pages=page;
return pages+1;
}
}
public int getUp(int page)
{
if(page==1)
{
return pages;
}else
{
pages=page;
return pages-1;
}
}
public int getLast(int page)
{
return pageCount;
}
public List<PageBean> getJobs(int page)
{
list=new ArrayList<PageBean>();
String sql;
con=connect.getCon();
try {
stm=con.createStatement();
if(page==1)
{
sql="select top 5 * from jobs";
}else
{
sql="select top 5 * from jobs where job_id not in (select top "+5*(page-1)+" job_id from jobs)";
}
rs=stm.executeQuery(sql);
while(rs.next())
{
pb=new PageBean();
pb.setJob_id(rs.getString("job_id").toString());
pb.setJob_desc(rs.getString("job_desc").toString());
pb.setMin_lvl(rs.getString("min_lvl").toString());
pb.setMax_lvl(rs.getString("max_lvl").toString());
list.add(pb);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return list;
} |
4.新建个页面调用getPage类中的方法
以下为引用的内容：
<html>
<head>
<script type="text/javascript" src="dwr/util.js"></script>
<script type="text/javascript" src="dwr/engine.js"></script>
<script type="text/javascript" src="dwr/interface/GetPages.js"></script>
<script type="text/javascript">
var page=1;
function first()
{
GetPages.getFirst(1,callback);
}
function callback(pages)
{
page=pages;
GetPages.getJobs(pages,process);
}
function next()
{
GetPages.getNext(page,callback);
}
function up()
{
GetPages.getUp(page,callback);
}
function last()
{
GetPages.getLast(page,callback);
}
function process(item)
{
DWRUtil.removeAllRows("job");
var cell=[
function(item){return item.job_id},
function(item){return item.job_desc},
function(item){return item.min_lvl},
function(item){return item.max_lvl}
];
DWRUtil.addRows("job",item,cell);
}
</script>
</head>
<body onload="javaScript:first();">
<table border="1">
<tbody id="job">
</tbody>
</table>
<a href="javaScript:first()">第一页</a>
<a href="javaScript:up()">上一页</a>
<a href="javaScript:next()">下一页</a>
<a href="javaScript:last()">最后一页</a>
</body>
</html> |
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