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ServletContext_功能_域对象
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域?qū)ο?#xff1a;共享數(shù)據(jù)
?? ?1. setAttribute(String name,Object value)
?? ?2. getAttribute(String name)
?? ?3. removeAttribute(String name)
?? ?* ServletContext對象范圍：所有用戶所有請求的數(shù)據(jù)
?
package com.learn.web.servletcontext;import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;@WebServlet("/servletContextDemo3")
public class ServletContextDemo3 extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {/*ServletContext功能：1. 獲取MIME類型：2. 域?qū)ο?#xff1a;共享數(shù)據(jù)3. 獲取文件的真實(服務器)路徑*///2. 通過HttpServlet獲取ServletContext context = this.getServletContext();//設置數(shù)據(jù)context.setAttribute("msg","haha");}protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request,response);}
}
package com.learn.web.servletcontext;import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;@WebServlet("/servletContextDemo4")
public class ServletContextDemo4 extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {/*ServletContext功能：1. 獲取MIME類型：2. 域?qū)ο?#xff1a;共享數(shù)據(jù)3. 獲取文件的真實(服務器)路徑*///2. 通過HttpServlet獲取ServletContext context = this.getServletContext();//獲取數(shù)據(jù)Object msg = context.getAttribute("msg");System.out.println(msg);}protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request,response);}
}
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