Request对象实现包含

最新推荐文章于 2022-08-31 16:22:38 发布

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本文通过两个Servlet（IncludeDemo1和IncludeDemo2）演示了Servlet包含机制的工作原理。IncludeDemo1作为源Servlet发送响应并调用IncludeDemo2，后者设置刷新头并追加响应内容。该过程展示了如何在一个请求中合并多个Servlet的响应。

IncludeDemo1.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;

//包含：源
//只会包含目标的正文，头部信息包含前清空
public class IncludeDemo1 extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.getWriter().write("11111");
        request.getRequestDispatcher("/servlet/IncludeDemo2").include(request, response);
    }

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

}

IncludeDemo2.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;

//包含：目标
public class IncludeDemo2 extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setIntHeader("Refresh", 1);
        response.getWriter().write("22222");
    }

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

}