DWR辅助篇（1）

<init-param>

<param-name>debug</param-name>

<param-value>true</param-value>

</init-param>

解析：<init-param>

servlet范围内的参数，只能在servlet的init()方法中取得，在web.xml中配置如下：
<servlet>
<servlet-name>MainServlet</servlet-name>
<servlet-class>com.wes.controller.MainServlet</servlet-class>
<init-param>
<param-name>param1</param-name>
<param-value>avalible in servlet init()</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
</servlet>

在servlet中可以通过代码分别取用：
package com.wes.controller;

imp<wbr style="padding-right:0px; padding-left:0px; padding-bottom:0px; margin:0px; line-height:22px; padding-top:0px"><wbr><wbr><wbr>ort javax.servlet.ServletException;<br style="padding-right:0px; padding-left:0px; padding-bottom:0px; margin:0px; line-height:22px; padding-top:0px"> imp<wbr style="padding-right:0px; padding-left:0px; padding-bottom:0px; margin:0px; line-height:22px; padding-top:0px"><wbr><wbr><wbr>ort javax.servlet.http.HttpServlet;</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>

public class MainServlet extends HttpServlet ...{

public MainServlet() ...{
super();
}
public void init() throws ServletException ...{
System.out.println("下面的两个参数param1是在servlet中存放的");
System.out.println(this.getInitParameter("param1"));
System.out.println("下面的参数是存放在servletcontext中的");
System.out.println(getServletContext().getInitParameter("context/param"));
}
}

参数只能在servlet的init()方法中通过this.getInitParameter("param1")取得.

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<url-pattern>/dwr/*</url-pattern>

解析：说明只要只要启动工程的时候包含wdr名字的文件都会调用这里

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<create javascript="hello" creator="new">
<param name="class" value="com.yinhe.service.HelloDWR"></param>

解析：javascript="hello" 将那个HelloWDR类在javaScript中取名叫hello 用来调用HelloWDR类中的数据

creator="new" 创建形式为 new

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

<script type='text/javascript' src='/DWR/dwr/interface/hello.js'></script>

<script type='text/javascript' src='/DWR/dwr/util.js'></script>

解析：这3个 是测试成功那个页面显示出来的 直接copy 到jsp里面就好啦

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hello.getHello(username, callback);

JS里面的hello.getHello 多了一个 参数 callback用来返回数据

注：JS里面提示性的调用HelloWdr类中的方法 是出不来的 没有提示

要自己写