DWR（一）：搭建

1.下载Dwr

网址：http://directwebremoting.org/dwr/downloads/index.html

2.创建工程、导入JAR

我下载的是dwrdemo.war。解压后：

从lib文件中获得dwr.jar；放入自己web工程；

3.配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>testDwr</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
<!--   Dwr核心Servlet -->
  <servlet>
      <servlet-name>dwrServlet</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>
  <!--   Dwr核心Servlet Url映射-->
  <servlet-mapping>
      <servlet-name>dwrServlet</servlet-name>
      <url-pattern>/dwrServletUrl/*</url-pattern>
  </servlet-mapping>

</web-app>

说明：发往/dwrServletUrl/*的所有请求都有org.directwebremoting.servlet.DwrServlet来处理；

问题：当配好完毕后，启动工程。工程启动不起来了！ 报错如下

原因：缺少Jar包。java.lang.NoClassDefFoundError: Lorg/apache/commons/logging/Log; 缺少logging.jar

解决：添加 logging.jar

4.配置Dwr.xml

Dwr.xml文件的作用就是将Java Class 与JavaScript 对应；

 

首先新建Java类

package com.devan.test

public class Test {
    String name ;
    String pass;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPass() {
        return pass;
    }
    public void setPass(String pass) {
        this.pass = pass;
    }
}

配置Dwr.xml

<?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="MyTest">
      <param name="class" value="com.devan.test.Test"/>
    </create>
    
  </allow>

</dwr>

访问 ： http://localhost:8080/testDwr/dwrServletUrl/