DWR（Direct WebRemoting）是一个开源的类库,可以帮助开发人员开发包含AJAX技术的网站.它可以允许在浏览器里的代码使用运行在WEB服务器上的JAVA函数,就像它就在浏览器里一样.
一、dwr入门demo
开始之前请在myeclipse下建立web工程dwrWeb
- 下载jar包,放到你的java web应用的WEB-INF/lib 目录下.
注意:从dwr2.0开始,需要用到commons-logging包
- 编辑web.xml,加入servlet,让web应用支持 dwr
<servlet>
<display-name>DWRServlet</display-name>
<servlet-name>dwr-invoker</servlet-name>
<servlet-class>org.directwebremoting.servlet.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>
- 在web.xml的同级目录下建立dwr.xml文件,这个配置文件定义了dwr可以创建和调用哪些java类
<?xmlversion="1.0" encoding="UTF-8"?>
<!DOCTYPEdwr PUBLIC
"-//GetAhead Limited//DTD Direct WebRemoting 2.0//EN"
"http://getahead.org/dwr/dwr20.dtd">
<dwr>
<allow>
<create creator="new"javascript="Demo">
<param name="class"value="com.Demo"/>
</create>
</allow>
</dwr>
- 建立java类文件
package com;
publicfinal class Demo
{
public String hello(String name)
{
return "恭喜恭喜," + name +"你的dwr程序成功运行!Hava fun!";
}
}
- 建立js文件
functionhello() {
var name =dwr.util.getValue("name");
Demo.hello(name, function(data) {
dwr.util.setValue("result",data);
});
- 建立index.jsp文件
<!DOCTYPEHTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type"content="text/html; charset=utf-8" />
<script type='text/javascript'src='<%=request.getContextPath()%>/dwr/interface/Demo.js'>
</script>
<script type='text/javascript'src="<%=request.getContextPath()%>/dwr/engine.js">
</script>
<script type='text/javascript'src="<%=request.getContextPath()%>/dwr/util.js">
</script>
<script type='text/javascript'src='hello.js'>
</script>
</head>
<body>
<input type="text"name="name" value="Hello World!">
<br>
<input type="button"onclick="hello();" value="button">
<br>
<span id="result"style="background: #eeffdd; padding: 10px"></span>
</body>
</html>
二、接下来为dwr+spring集成步骤：
- 新建一个web工程，导入dwr+spring所需jar，如下图
- 在web.xml配置文件中添加spring的配置。以及dwr的配置;
<?xmlversion="1.0" encoding="UTF-8"?>
<web-appversion="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">
<!--Spring上下文 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:resource/app*.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 配置DWR前端控制器 -->
<servlet>
<servlet-name>dwrServlet</servlet-name>
<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
<!-- 指定配置文件 -->
<init-param>
<param-name>config</param-name>
<!-- 如果有多个用","分开 -->
<param-value>
/WEB-INF/classes/config/dwr.xml
</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>true</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dwrServlet</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
</web-app>
- 配置applicationContext.xml
<?xmlversion="1.0" encoding="UTF-8"?>
<!--
配置系统基础环境
-->
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"
>
<bean id="demo" class="com.Demo"></bean>
</beans>
- 配置dwr.xml
<?xmlversion="1.0" encoding="UTF-8"?>
<!DOCTYPEdwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN""http://getahead.org/dwr/dwr20.dtd">
<!--通用dwr配置 -->
<dwr>
<allow>
<!-- 建立JS对象，将目标对象的方法转换成JS对象的方法-->
<createcreator="spring"javascript="Demo">
<param name="beanName" value="demo"/>
</create>
</allow>
</dwr>
dwr.xml的配置是整个与spring结合的关键。通过简单的学习，我想你也可以轻松的上手dwr了。
时间： 2024-10-07 17:36:06