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Response_案例1_路径_绝对路径
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2. 絕對路徑：通過絕對路徑可以確定唯一資源
?? ?* 如：http://localhost/day15/responseDemo2?? ??? ?/day15/responseDemo2
?? ?* 以/開頭的路徑
?? ?* 規(guī)則：判斷定義的路徑是給誰用的？判斷請求將來從哪兒發(fā)出
?? ??? ?* 給客戶端瀏覽器使用：需要加虛擬目錄(項目的訪問路徑)
?? ??? ??? ?* 建議虛擬目錄動態(tài)獲取：request.getContextPath()
?? ??? ??? ?* <a> , <form> 重定向...
?? ??? ?* 給服務(wù)器使用：不需要加虛擬目錄
?? ??? ??? ?* 轉(zhuǎn)發(fā)路徑
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<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>/day15/location.html</title>
</head>
<body><h1>相對路徑</h1><h1>找到當(dāng)前資源和目標資源之間的相對位置關(guān)系</h1><P>當(dāng)前資源:location.htmlhttp://localhost/day15/location.html</P><P>目標資源:http://localhost/day15/responseDemo2</P><a href="./responseDemo2">responseDemo2</a><a href="responseDemo2">responseDemo2</a><br><hr><h1>絕對路徑</h1><a href="/day15/responseDemo2">responseDemo2</a></body>
</html>
package com.learn.web.servlet;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("/responseDemo2")
public class ResponseDemo2 extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {System.out.println("demo2222222........");Object msg = request.getAttribute("msg");System.out.println(msg);}protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request,response);}
}
package com.learn.web.servlet;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("/responseDemo3")
public class ResponseDemo3 extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//轉(zhuǎn)發(fā)request.getRequestDispatcher("/responseDemo2").forward(request,response);}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request,response);}
}
package com.learn.web.servlet;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;/*** 重定向*/@WebServlet("/responseDemo1")
public class ResponseDemo1 extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {System.out.println("demo1........");//訪問/responseDemo1，會自動跳轉(zhuǎn)到/responseDemo2資源/* //1. 設(shè)置狀態(tài)碼為302response.setStatus(302);//2.設(shè)置響應(yīng)頭locationresponse.setHeader("location","/day15/responseDemo2");*/request.setAttribute("msg","response");//動態(tài)獲取虛擬目錄String contextPath = request.getContextPath();//簡單的重定向方法response.sendRedirect(contextPath+"/responseDemo2");
// response.sendRedirect("http://www.baidu.com");}protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request,response);}
}
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