直接來，ResponseDemo1代碼，get請(qǐng)求到post請(qǐng)求，重定向到ResponseDemo2

我的虛擬目錄為

ResponseDemo1代碼，302是重定向狀態(tài)碼，Http狀態(tài)碼大全

package com.lingaolu.response; import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.*;import java.io.IOException; /** * @author 林高祿 * @create 2020-07-10-15:24 */@WebServlet('/responseDemo1')public class ResponseDemo1 extends HttpServlet { @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println('responseDemo1進(jìn)來了......'); // 設(shè)置狀態(tài)碼為302 response.setStatus(302); // 動(dòng)態(tài)獲取虛擬目錄，以后修改虛擬目錄的時(shí)候就不用了修改代碼 String contextPath = request.getContextPath(); // 設(shè)置響應(yīng)頭location response.setHeader('location',contextPath+'/responseDemo2'); } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request,response); }}

ResponseDemo2代碼

package com.lingaolu.response; import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.*;import java.io.IOException; /** * @author 林高祿 * @create 2020-07-10-15:24 */@WebServlet('/responseDemo2')public class ResponseDemo2 extends HttpServlet { @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println('responseDemo2進(jìn)來了......'); } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request,response); }}

瀏覽器訪問，訪問前

瀏覽器訪問，訪問后

控制臺(tái)輸出

從以上結(jié)果可以看出：

瀏覽器上的請(qǐng)求地址變了 重定向是2次請(qǐng)求，一次是responseDemo1請(qǐng)求，一次是responseDemo2請(qǐng)求

由于狀態(tài)碼固定是302，響應(yīng)頭固定是location，所以請(qǐng)求轉(zhuǎn)發(fā)提供了更方便的方式

void sendRedirect(String var1)

ResponseDemo3代碼

package com.lingaolu.response; import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.*;import java.io.IOException; /** * @author 林高祿 * @create 2020-07-10-15:24 */@WebServlet('/responseDemo3')public class ResponseDemo3 extends HttpServlet { @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println('responseDemo3進(jìn)來了......');; // 動(dòng)態(tài)獲取虛擬目錄，以后修改虛擬目錄的時(shí)候就不用了修改代碼 String contextPath = request.getContextPath(); response.sendRedirect(contextPath+'/responseDemo2'); } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request,response); }}

啟動(dòng)，瀏覽器訪問

控制臺(tái)輸出

我們把ResponseDemo3代碼改一下，重定向到百度

package com.lingaolu.response; import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.*;import java.io.IOException; /** * @author 林高祿 * @create 2020-07-10-15:24 */@WebServlet('/responseDemo3')public class ResponseDemo3 extends HttpServlet { @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println('responseDemo3進(jìn)來了......');; response.sendRedirect('http://www.baidu.com'); } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request,response); }}

重啟訪問，就重定向到百度了

從上面結(jié)果我們可以看出，重定向可以訪問其他服務(wù)器的資源

我們寫一個(gè)ResponseDemo4，探索一下共享數(shù)據(jù)情況，ResponseDemo4里請(qǐng)求寫進(jìn)了一個(gè)數(shù)據(jù)name

package com.lingaolu.response; import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.*;import java.io.IOException; /** * @author 林高祿 * @create 2020-07-10-15:24 */@WebServlet('/responseDemo4')public class ResponseDemo4 extends HttpServlet { @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println('responseDemo4進(jìn)來了......'); request.setAttribute('name','林大帥'); String contextPath = request.getContextPath(); response.sendRedirect(contextPath+'/responseDemo2'); } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request,response); }}

同時(shí)ResponseDemo2改一下，獲取數(shù)據(jù)name

重啟，瀏覽器訪問

控制臺(tái)輸出：

從上面的null可以看出，重定向不可以共享數(shù)據(jù)

重定向的特點(diǎn)總結(jié)：（與之對(duì)應(yīng)的------請(qǐng)求轉(zhuǎn)發(fā)詳情與特點(diǎn)）

瀏覽器地址欄路徑發(fā)生變化，最終地址為最后轉(zhuǎn)發(fā)的地址 轉(zhuǎn)發(fā)只是多次請(qǐng)求，轉(zhuǎn)發(fā)幾次就幾次請(qǐng)求，不共享數(shù)據(jù) 可以訪問其他服務(wù)器的資源

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