Request对象请求转发

最新推荐文章于 2024-04-28 22:20:43 发布

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本文通过两个Java Servlet示例展示了如何使用request对象进行请求转发，并共享请求范围中的数据。源Servlet设置属性后转发到目标Servlet，后者读取并输出该属性。

RequestDemo7.java文件：

package com.neu;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/*Request实现请求转发*/
//转发：源
//源和目标：共享请求范围中的数据
public class RequestDemo7 extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setAttribute("p", "ppp");
        RequestDispatcher rd = getServletContext().getRequestDispatcher("/servlet/RequestDemo8");
        //RequestDispatcher rd = request.getRequestDispatcher("/servlet/RequestDemo8");
        rd.forward(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doGet(request, response);
    }

}

RequestDemo8.java文件：

package com.neu;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//转发：目标
public class RequestDemo8 extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String s = (String) request.getAttribute("p");
        response.getWriter().write(s);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doGet(request, response);
    }

}