关于DWR
今天突然要用到DWR实现局部刷新,可是一想,原来做过可是现在一点印象都没故写此篇(一个简单的例子):
首先导入dwr.jar包,再写一个dwr.xml文件跟web.xml文件同级目录:(虽然dwr.xml文件没有像dtd或者shema这样的规范,但是有个潜在的规范)格式如下:
dwr.xml文件配置完成后:配置web.xml文件如下:
上述的类如下:
页面如下:
首先导入dwr.jar包,再写一个dwr.xml文件跟web.xml文件同级目录:(虽然dwr.xml文件没有像dtd或者shema这样的规范,但是有个潜在的规范)格式如下:
<?xml version="1.0" encoding="UTF-8"?> <dwr> <allow> <!-- 生成一个class对象. --> <create creator="new" javascript="personInfo" class="com.dao.PersonInfoDao"> </create> </allow> </dwr>
dwr.xml文件配置完成后:配置web.xml文件如下:
<?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">
<!-- dwr包 -->
<servlet>
<servlet-name>aa</servlet-name>
<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>aa</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
上述的类如下:
public class PersonInfoDao {
public String getUsername(String username){
if("true".equals(username)){
return "true";
}
return "false";
}
}
页面如下:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>index.html</title>
<script type="text/javascript" src="/DWRAjax/dwr/engine.js"></script>
<script type="text/javascript" src="/DWRAjax/dwr/util.js"></script>
<script type="text/javascript" src="/DWRAjax/dwr/interface/personInfo.js"></script>
<script type="text/javascript">
function check(){
var user = document.getElementById('username').value;
//personInfo.getUsername(user,responseMethod);
personInfo.getUsername(user,responseMethod);
}
function responseMethod(val){
alert(val);
}
</script>
</head>
<body>
<input type="text" id="username" />
<input type="button" value="button" onclick="check();"/>
</body>
</html>