getServletContext和getServletConfig中getInitParameter的区别

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

<web-app version="2.4"

...

<context-param>

<param-name>ricky</param-name>

<param-value>web app test</param-value>

</context-param>

<servlet>

<servlet-name>rickyTest</servlet-name>

<servlet-class>XXXXXXX</servlet-class>

<init-param>

<param-name>ricky</param-name>

<param-value>servlet test</param-value>

</init-param>

</servlet>

在servlet中通過如下代碼

getServletContext().getInitParameter("ricky");

getServletConfig().getInitPatameter("ricky");

getServletConfig().getServletContext().getInitParameter("ricky");

getInitParameter("ricky");

輸出結果為

web app test

servlet test

web app test

servlet test

1：getServletContext()取得的是 <context-param>配置的参数

getServletConfig()取得的是 <servlet> <init-param>配置的参数

2：getServletContext()应用于整个web App,而getServletConfig()仅应用于当前Servlet。 但是ServletConfig对象拥有ServletContext的引用。所以可以通过getServletConfig()来获得web App的初始值。