ServletConfig

ServletConfig 对象是 Servlet 的专属配置对象, 每个 Servlet 都单独拥有一个 ServletConfig 对象, 用来获取 web.xml 中的配置信息

web.xml中的配置如下:(写在servlet的内部配置中)

        
　　　　　......
　　　　　<url-pattern>/sc3</url-pattern>
    </servlet-mapping>

    <servlet>
        <servlet-name>scf</servlet-name>
        <servlet-class>com.web.TestServletConfig</servlet-class>
        <init-param>
            <param-name>name</param-name>
            <param-value>TestServletConfig内部的配置数据</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>scf</servlet-name>
        <url-pattern>/scf</url-pattern>
    </servlet-mapping>
</web-app>

servlet代码:

public class TestServletConfig extends HttpServlet {

    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html;charset=utf-8");
        req.setCharacterEncoding("utf-8");

        //获取ServletConfig对象
        ServletConfig sc = this.getServletConfig();

        //获取web.xml中的配置数据
        String name = sc.getInitParameter("name");
        resp.getWriter().write(name);


    }
}

浏览器访问该servlet可获取web.xml中的配置数据: