RequestDispatcher对象 请求转发

请求转发，地址不改变

context.getRequestDispatcher("/getInitParameter").forward(req,resp);

代码示例如下

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
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 ReqDispatcher extends HttpServlet {

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

        ServletContext context = this.getServletContext();
        /*
        RequestDispatcher requestDispatcher = context.getRequestDispatcher("/getInitParameter");
        requestDispatcher.forward(req,resp);
        */
        context.getRequestDispatcher("/getInitParameter").forward(req,resp);
    }

    @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>reqDispatcher</servlet-name>
        <servlet-class>com.mahe666.servlet.ReqDispatcher</servlet-class>
    </servlet>

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

</web-app>