直接來，ResponseDemo1代碼，get請求到post請求，重定向到ResponseDemo2

我的虛擬目錄為

ResponseDemo1代碼，302是重定向狀態碼，Http狀態碼大全

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進來了......'); // 設置狀態碼為302 response.setStatus(302); // 動態獲取虛擬目錄，以后修改虛擬目錄的時候就不用了修改代碼 String contextPath = request.getContextPath(); // 設置響應頭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

控制臺輸出

從以上結果可以看出：

瀏覽器上的請求地址變了 重定向是2次請求，一次是responseDemo1請求，一次是responseDemo2請求

由于狀態碼固定是302，響應頭固定是location，所以請求轉發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進來了......');; // 動態獲取虛擬目錄，以后修改虛擬目錄的時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，瀏覽器訪問

控制臺輸出

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

從上面結果我們可以看出，重定向可以訪問其他服務器的資源

我們寫一個ResponseDemo4，探索一下共享數據情況，ResponseDemo4里請求寫進了一個數據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ResponseDemo2改一下，獲取數據name

重啟，瀏覽器訪問

控制臺輸出：

從上面的null可以看出，重定向不可以共享數據

重定向的特點總結：（與之對應的------請求轉發詳情與特點）

瀏覽器地址欄路徑發生變化，最終地址為最后轉發的地址 轉發只是多次請求，轉發幾次就幾次請求，不共享數據 可以訪問其他服務器的資源

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