java基础之DWR使用

    <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">

    <servlet>

        <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>

      <!--    <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>

    <!-- org.directwebremoting.servlet.DwrServlet 2.X-->

    <!--uk.ltd.getahead.dwr.DWRServlet 1.X-->

    3. 写服务端代码(写类)

    如:

    package com.sk.dwr;

    public class Test {

    //返回一般数据

       public String getString(String s){

          return s+"Hello";

       }

    //返回对象

    Public String getUser(String name){

       Return new User(name);

    }

    }

    4. 于web.xml同目录下添加并配置dwr.xml

    如:

    <?xml version="1.0" encoding="UTF-8"?>

    <!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN"

        "http://www.getahead.ltd.uk/dwr/dwr10.dtd">

    <dwr>:可以有多个allow标签

     <allow>:要暴露给js的方法,可以有多个

         <create creator="new" javascript="Hello">

    <!—new表示调用无参构造new对象,Hello表示new出的对象的句柄,用于在js中调用 -->

          <param name="class" value="com.sk.dwr.Test"/>

    <!—name表示类,value指定类的完整路径 -->

         </create>