我的第一个DWR程序 -

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我的第一个DWR程序

DWR Web XML Java SUN

这个程序是经过我一整天的研究才搞明白，怎样解决“缺少对象”、“XXX未定义”的问题
text.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title>Simple Text Generation Demo</title>
  <meta http-equiv="Content-Type" content="text/html; charset=us-ascii" />  
  <script type='text/javascript' src='./dwr/engine.js'> </script>
  <script type='text/javascript' src='./dwr/util.js'> </script>
  <script type='text/javascript' src='./dwr/interface/Service.js'> </script>
  <script type="text/javascript" src='text.js'> </script>
  <link rel="stylesheet" type="text/css" href="../tabs/tabs.css" />
  <link rel="stylesheet" type="text/css" href="../generic.css" />
</head>
<body >  
    <p>
      Name:
      <input type="text" id="demoName" value="Joe"/>
      <input type="button" id="demoSend" value="Send" onclick="update()"/>
      <br/>
      Reply from wlp's service: <span id="demoReply" style="background:#eeffdd; padding-left:4px; padding-right:4px;">&nbsp;</span>
    </p> 
    </body>
</html>

text.js

function update() {
  var name = dwr.util.getValue("demoName");
  Service.sayHello(name, function(data) {
    dwr.util.setValue("demoReply", data);
  });
}

WEB-INF下面是
dwr.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC
    "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
    "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>
  <servlet>
    <servlet-name>dwr-invoker</servlet-name>
    
    <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>

    <!-- This should NEVER be present in live -->
    <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>

</web-app>

web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC
    "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
    "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>
  <servlet>
    <servlet-name>dwr-invoker</servlet-name>
    
    <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>

    <!-- This should NEVER be present in live -->
    <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>

</web-app>

Service.java

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC
    "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
    "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>
  <servlet>
    <servlet-name>dwr-invoker</servlet-name>
    
    <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>

    <!-- This should NEVER be present in live -->
    <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>

</web-app>

我在跟着dwr中文教程编码的时候老是出现Service未定义的问题，我重复的进行代码测试终于发现为自己的类更改三处，
第一处在test.js
如下：function update() {
var name = dwr.util.getValue("demoName");
Service.sayHello(name, function(data) {
    dwr.util.setValue("demoReply", data);
});
}，第二处在dwr.xml
如下：
<create creator="new" javascript="Service">
      <param name="class" value="helloworld.Service"/>
    </create>，第三处在text.html中
如下：
<script type='text/javascript' src='./dwr/engine.js'> </script>
<script type='text/javascript' src='./dwr/util.js'> </script>
<script type='text/javascript' src='./dwr/interface/Service.js'> </script>
<script type="text/javascript" src='text.js'> </script>
<link rel="stylesheet" type="text/css" href="../tabs/tabs.css" />
<link rel="stylesheet" type="text/css" href="../generic.css" />