重定向

Redirect.java

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class Redirect extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        //重定向其实就做了这两件事

        /*
        resp.setHeader("Location","/resp/imgCode");
        resp.setStatus(302);
        */

        //跳转的地址前需要加上项目名
        resp.sendRedirect("/项目名/映射地址");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
				http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0"
         metadata-complete="true">

    <servlet>
        <servlet-name>redirect</servlet-name>
        <servlet-class>com.mahe666.servlet.Redirect</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>redirect</servlet-name>
        <url-pattern>/redirect</url-pattern>
    </servlet-mapping>

</web-app>