servlet全局参数的设置

Posted 2021-02-15 cq0143

通过xml配置的方式：

 

web.xml:

增加如下部分：

<context-param>
<param-name>kkkk</param-name>
<param-value>xxxxxxxx</param-value>
</context-param>

这个属性和值就是context容器中的全局参数了，所以所有的servlet实例都能访问到。

 

HttpServletDemo02.java：

package com.fl.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HttpServletDemo02 extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
            System.out.println("dddd");
    }
    @Override
    public void init(ServletConfig config) throws ServletException {
        ServletContext sc = config.getServletContext(); //增加了这部分。
        String temp = sc.getInitParameter("kkkk");
        System.out.println(temp);
    }
}