Servlet中ServletConfig的作用

你自己创建一个jar包,里面有个不固定参数,需要使用者自己配置参数的时候使用;

代码:

ServletConfig config = this.getServletConfig();
String paraName = config.getInitParameter("name");
if (paraName == null) {
    PrintWriter out = response.getWriter();
    throw new IllegalArgumentException("name这个参数一定要写");
} else {
    System.out.println("name....");
}


xml:

</servlet-mapping>
<servlet>
    <servlet-name>configTest</servlet-name>
    <servlet-class>com.mljqqh.servlet.ServletGet</servlet-class>
    <init-param>
        <param-name>name</param-name>
        <param-value>mljqqh</param-value>
    </init-param>
</servlet>