我想使用dwr来实现局部刷新?谁能提供一个非常简单的例子让我学习呢?
最好是一个留言板形式的,带分页的。界面丑一点没关系。替换的html代码,是写在java类里面取出数据后生成html后返回,还是在javascript取出数据后再生成html呢?
也就是说html是在java类生成还是javascript生成?有例子就好了
最好是一个留言板形式的,带分页的。界面丑一点没关系。替换的html代码,是写在java类里面取出数据后生成html后返回,还是在javascript取出数据后再生成html呢?
也就是说html是在java类生成还是javascript生成?有例子就好了
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JSP页面
<%@ page language="java" import="java.util.*" pageEncoding="gbk"
isELIgnored="false"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
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 'index.jsp' starting page</title>
<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/ShowPeople.js'> </script>
<script type="text/javascript">
function top()
{
var pagenum = dwr.util.getValue("pagenum");
alert(pagenum);
ShowPeople.showPeople(pagenum,callback);
}
function callback(data)
{
var cellfunctions = [
function(data){return data.answercontent;},
function(data){return data.type;}
];
dwr.util.removeAllRows("demo1");
dwr.util.addRows("demo1",data,cellfunctions); }
</script>
</head> <body>
<input type="text" name="pagenum"/><input type="button" value="页面" onclick="top();"/>
<table>
<tr>
<td>
题目内容
</td>
<td>
题目答案
</td>
</tr>
<tbody id="demo1">
</tbody>
</table>
</body>
</html>
############################
dwr.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://www.getahead.ltd.uk/dwr/dwr20.dtd">
<dwr>
<allow>
<create javascript="ShowPeople" creator="new">
<param name="class" value="com.jobcn.ShowPeople"></param>
<convert converter="bean" match="com.vo.Answers">
<param name="include" value="answercontent,type" />
</convert>
</allow>
<signatures>
<![CDATA[
import java.util.List;
import com.jobcn.ShowPeople;
import com.vo.Answers;
List<Answers> ShowPeople.showPeople(Integer pagenum);
]]>
</signatures></dwr>###########################
java代码
package com.jobcn;import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;import com.vo.Answers;public class ShowPeople {
private Connection con;
private PreparedStatement pstm;
private ResultSet rs;
private String driver="com.mysql.jdbc.Driver";
private String url="jdbc:mysql://127.0.0.1:3306/mydb";
private String user="root";
private String pwd="root";
public List<Answers> showPeople(String flagnum)
{
System.out.println(flagnum);
List<Answers> list = new ArrayList<Answers>();
try {
Class.forName(driver);
con = DriverManager.getConnection(url,user,pwd);
pstm = con.prepareStatement("select * from answers where questionsid="+flagnum);
rs = pstm.executeQuery();
while(rs.next())
{
Answers an = new Answers();
an.setAnswercontent(rs.getString("answercontent"));
an.setType(rs.getString("type"));
list.add(an);
}
} catch (Exception e) {
e.printStackTrace();
}
for(Answers a : list)
{
System.out.println(a.getAnswercontent());
}
return list;
}}