如何用ServletConfig从init-param获取参数?

就单纯获取init-param而言,上一种和这一种方法一样。不过ServletConfig还有很多其他的功能。见例子。
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例:1.2.1

ServletHello1.java:

package com;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ServletHello1 extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        ServletConfig c = getServletConfig();
        System.out.println(c.getServletName()+c.getInitParameter("zhangsan"));
    }
}


web.xml和上例一样:



运行Servlet后,console中输出结果:

ServletHello11000