Java中如何使用Response重定向

直接来，ResponseDemo1代码，get请求到post请求，重定向到ResponseDemo2

我的虚拟目录为

ResponseDemo1代码，302是重定向状态码，Http状态码大全

package com.lingaolu.response; import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.*;import java.io.IOException; /** * @author 林高禄 * @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进来了......'); // 设置状态码为302 response.setStatus(302); // 动态获取虚拟目录，以后修改虚拟目录的时候就不用了修改代码 String contextPath = request.getContextPath(); // 设置响应头location response.setHeader('location',contextPath+'/responseDemo2'); } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request,response); }}

ResponseDemo2代码

package com.lingaolu.response; import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.*;import java.io.IOException; /** * @author 林高禄 * @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进来了......'); } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request,response); }}

浏览器访问，访问前

浏览器访问，访问后

控制台输出

从以上结果可以看出：

浏览器上的请求地址变了 重定向是2次请求，一次是responseDemo1请求，一次是responseDemo2请求

由于状态码固定是302，响应头固定是location，所以请求转发提供了更方便的方式

void sendRedirect(String var1)

ResponseDemo3代码

package com.lingaolu.response; import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.*;import java.io.IOException; /** * @author 林高禄 * @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进来了......');; // 动态获取虚拟目录，以后修改虚拟目录的时候就不用了修改代码 String contextPath = request.getContextPath(); response.sendRedirect(contextPath+'/responseDemo2'); } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request,response); }}

启动，浏览器访问

控制台输出

我们把ResponseDemo3代码改一下，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 林高禄 * @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进来了......');; response.sendRedirect('http://www.baidu.com'); } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request,response); }}

重启访问，就重定向到百度了

从上面结果我们可以看出，重定向可以访问其他服务器的资源

我们写一个ResponseDemo4，探索一下共享数据情况，ResponseDemo4里请求写进了一个数据name

package com.lingaolu.response; import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.*;import java.io.IOException; /** * @author 林高禄 * @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进来了......'); request.setAttribute('name','林大帅'); String contextPath = request.getContextPath(); response.sendRedirect(contextPath+'/responseDemo2'); } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request,response); }}

同时ResponseDemo2改一下，获取数据name

重启，浏览器访问

控制台输出：

从上面的null可以看出，重定向不可以共享数据

重定向的特点总结：（与之对应的------请求转发详情与特点）

浏览器地址栏路径发生变化，最终地址为最后转发的地址 转发只是多次请求，转发几次就几次请求，不共享数据 可以访问其他服务器的资源

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