DWR之DWR实例(1)

本文主要是介绍DWR之DWR实例(1)，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

DWR之DWR实例(1)
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1.首先向项目中加入dwr.jar文件,这里我们使用maven构建，同时dwr还要依赖commons-logging.jar包，如例（pom.xml）:

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>aaa</groupId>
<artifactId>bbb</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>bbb Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- 必需的依赖 -->
<dependency>
<groupId>org.directwebremoting</groupId>
<artifactId>dwr</artifactId>
<version>3.0.M1</version>
</dependency>
<!-- 必需的依赖 -->
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1.1</version>
</dependency>
</dependencies>
<build>
<finalName>bbb</finalName>
</build>
</project>

2.在web.xml文件中增加DWRSevlet的配置，DWR指定映射路径的js(如：带有/dwr)都由这个servlet处理，就像这些路径的js(带有/dwr的路径)：

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<script src='/[YOUR-WEBAPP-CONTEXT]/dwr/interface/[YOUR-SCRIPT].js'></script>
<script src='/[YOUR-WEBAPP-CONTEXT]/dwr/engine.js'></script>

这两个件都是虚拟文件，并不是真实的文件。

web.xml的配置如下：

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<?xml version="1.0" encoding="UTF-8"?>
<web-app 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"
version="2.4">
<display-name>firstDWR</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<!-- The DWR Servlet... -->
<servlet>
<display-name>DWR Servlet</display-name>
<servlet-name>dwr-invoker</servlet-name>
<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
<!-- 初始化参数，增加调试功能 -->
<init-param>
<param-name>debug</param-name>
<param-value>true</param-value>
</init-param>
<!-- 跨域调用配置信息,不是必须的 -->
<init-param>
<param-name>crossDomainSessionSecurity</param-name>
<param-value>false</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
</web-app>

3.创建dwr.xml文件(与web.xml在同一个目录):

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC 
"-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN" "http://getahead.org/dwr/dwr30.dtd">
<dwr>
<allow>
<create creator="new" javascript="MathDelegate">
<param name="class" value="app.MathDelegate" />
</create>
</allow>
</dwr>

4.创建java文件，如：MathDelegate.java文件：

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package app;
/**
* 数值计算
* @author fuhd
*/
public class MathDelegate {
/**加法*/
public int add(int a,int b){
return a+b;
}
/**减法*/
public int subtract(int a,int b){
return a-b;
}
/**乘法*/
public int multiply(int a,int b){
return a*b;
}
/**除法*/
public int divide(int a,int b){
return a/b;
}
}

5.创建jsp文件(可以是html或其它模板的文件)，如：index.jsp ：

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