很恼火，getInitParameter 总取不到值

[一缕青烟]

java 代码

package com.nong;
import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class CreateDBServlet extends HttpServlet{
	private String url;
	private String user;
	private String password;
	String driverClass;
	String s1;
	public void init() throws ServletException
	{
		 
        s1=this.getInitParameter("servletParam");  
	     
	}
	
	public void doGet(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException
	{  
		 
		
		  res.setContentType("text/html"); 
          PrintWriter out = res.getWriter(); 
         
          String s2 = getServletContext().getInitParameter("webParam");  
          out.println("s1"+s1);  
          out.println("<br>");
          out.println("s2"+s2); 
          out.flush(); 
          out.close();
		
	}
	
	public void doPost(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException
	{
		this.doGet(req,res);
		
	}
	
}

xml 代码

<?xml version="1.0" encoding="UTF-8"?>  
<web-app id="WebApp_ID" version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  

<context-param>  
<param-name>webParam</param-name>  
<param-value>aaa</param-value>  
</context-param>  

<servlet>  
<servlet-name>test</servlet-name>  
<servlet-class>Test</servlet-class>  
</servlet>  

<init-param>  
<param-name>servletParam</param-name>  
 <param-value>bbb</param-value>  
</init-param>  


 <servlet-mapping>  
<servlet-name>test</servlet-name>  
 <url-pattern>/test</url-pattern>  
</servlet-mapping>  

  <servlet>
        <servlet-name>my</servlet-name>
        <servlet-class>com.nong.CreateDBServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>my</servlet-name>
        <url-pattern>/my</url-pattern>
    </servlet-mapping>

</web-app>  

结果：
s1null
s2aaa


谢谢

[-AJ-]

getServletContext()

[一缕青烟]

为什么 getInitParameter() 这个不行呢？

[一缕青烟]

有好人来吗？

[-AJ-]

context != servlet

[一缕青烟]

[Quote=引用 4 楼 的回复:]
context != servlet
[/Quote]
......

[javabugsmaker]

你把<init-param>的定义放在所有<servlet>之前，
是不是servlet先加载，才到<init-param>啊。。

[-AJ-]

this = servlet in your programm

getInitParameter is method of context, not of a servlet.

clear?

[一缕青烟]

还是不行、servlet 里的servletParam 值没法取到。

<servlet>  
<servlet-name>test</servlet-name>  
<servlet-class>Test</servlet-class>  
</servlet>  

<init-param>  
<param-name>servletParam</param-name>  
 <param-value>bbb</param-value>  
</init-param>  


 <servlet-mapping

[一缕青烟]

[Quote=引用 8 楼 的回复:]
this = servlet in your programm

getInitParameter is method of context, not of a servlet.

clear?
[/Quote]
滚，越远越好。