Servlet 中获取 application 对象的两种方法

本资源引自：

Servlet中取得application对象的两种方法 - gjhgkh - 51CTO技术博客

http://77857.blog.51cto.com/67857/175149

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在Servlet中，取得application有两种方法：
1.通过无参初始化方法，直接取得；
2.通过有参初始化方法，必须使用config对象取得。

实例：
1.无参初始化方法：
Application.java:

package mgc.servlet.test;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Application extends HttpServlet {
public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException,ServletException {
this.doPost(request,response);
}
public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException,ServletException {
//取得Application对象
ServletContext application=this.getServletContext();
//设置Application属性
application.setAttribute("name", "Magci");
//跳转到接收页面
response.sendRedirect("application.jsp");
}
}

web.xml:

application.jsp:

2.有参初始化方法:

Config.java:

package mgc.servlet.test;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Config extends HttpServlet {
private ServletConfig conf=null;
public void init(ServletConfig conf) throws ServletException {
//实例化config对象
this.conf=conf;
}
public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException,ServletException {
this.doPost(request,response);
}
public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException,ServletException {
//通过config对象取得Application对象
ServletContext application=this.conf.getServletContext();
//设置Application属性
application.setAttribute("name", "Magci");
//跳转到接收页面
response.sendRedirect("config.jsp");
}
}

web.xml:

config.jsp:

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