实现请求重定向的思路：
具体代码：
第一种方法（不推荐）：
Servlet1.java:
package demo01; 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; /** * 用于实现请求重定向 第一种方法（不推荐） */ public class Response1 extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("这是response1！"); //设置响应状态码302，表示已搬迁（已搬迁） response.setStatus(302); //设置响应头，说明新的地址在哪里 response.setHeader("location","http://localhost:8080/draft_war_exploded/response2"); } }
Servlet2.java:
package demo01; 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; /** * 用于实现请求重定向 第一种方法（不推荐） */ public class Response2 extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setCharacterEncoding("GBK"); response.getWriter().write("这是servlet2"); } }
第二种方法（推荐）：
Servlet2.java代码不变，Servlet3.java代替Servlet1.java
Servlet3.java:
package demo01; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; /** * 用于实现请求重定向 第二种方法（推荐） */ public class Response3 extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("这是response1！"); response.sendRedirect("http://localhost:8080/draft_war_exploded/response2"); } }
运行一下试一试：
浏览器中访问servlet1，按回车之后，显示servlet2的页面，并且路径也发生变化
访问servlet3也是如此。
