dwr学习笔记

最新推荐文章于 2022-05-19 00:16:00 发布

原创最新推荐文章于 2022-05-19 00:16:00 发布 · 231 阅读

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CC 4.0 BY-SA版权

文章标签：

#dwr #callback #javascript #function #jsp #servlet

本文介绍了如何在项目中集成Direct Web Remoting (DWR)，包括配置web.xml和dwr.xml文件，以及在JSP页面中调用Java方法的具体实现。

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一、导入dwr.jar后，在web.xml中加入如下配置

<servlet>
    <servlet-name>dwr-invoker</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>
     <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>

其中crossDomainSessionSecurity配置为false,表示允许从其他域进行请求，如果设置为true或者不设置会报

A request has been denied as a potential CSRF attack.

二、配置dwr.xml

<!DOCTYPE dwr PUBLIC
    "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN"
    "http://www.getahead.ltd.uk/dwr/dwr10.dtd">
<dwr>
 <allow>  
   <create creator="new" javascript="Test">
     <param name="class" value="com.main.test.JiekouImpl"/>
   </create>  
 </allow>
</dwr>

三、页面JSP代码

function test(){
   Test.fix(1,callback);
   setTimeout(test,3000);
   }
   
   function callback(message){  
         document.getElementById("ss").innerHTML=message;
    }

并导入JS包

<script type='text/javascript' src='/Test/dwr/interface/Test.js'></script>
  <script type='text/javascript' src='/Test/dwr/engine.js'></script>

启动服务器后再项目根目录下访问dwr如http://localhost:8080/Test/dwr

<script type='text/javascript' src='/Test/dwr/interface/Test.js'></script>
  <script type='text/javascript' src='/Test/dwr/engine.js'></script>

点击后，会显示如下提示在JSP中引入即可

To use this class in your javascript you will need the following script includes:

  <script type='text/javascript' src='/Test/dwr/interface/Test.js'></script>
  <script type='text/javascript' src='/Test/dwr/engine.js'></script>

function test(){
   Test.fix(1,callback);
   setTimeout(test,3000);
   }
   
   function callback(message){  
         document.getElementById("ss").innerHTML=message;
    }