RequestDispather对象的使用(六)

最新推荐文章于 2025-03-03 19:49:30 发布

凯耐

最新推荐文章于 2025-03-03 19:49:30 发布

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分类专栏： Java Web 文章标签：对象

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本文详细介绍了Java Servlet中RequestDispatcher接口的基本用法及其主要方法。通过一个完整的示例项目，展示了如何利用RequestDispatcher实现Servlet之间的请求转发及数据共享。

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(一)RequestDispather的使用
http://tutorials.jenkov.com/java-servlets/requestdispatcher.html

(二) RequestDispather的方法
https://docs.oracle.com/javaee/7/api/javax/servlet/RequestDispatcher.html

(三)代码演示

package com.demo;

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;

public class ForwordServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;


    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         response.setContentType("text/html  ;charset=utf-8");
         request.setAttribute("hobby", "打篮球");
         //1.getRequestDispatcher()方法封装某个路径指定资源的RequestDispatcher对象
         RequestDispatcher  d=request.getRequestDispatcher("/resultServlet");
         //2.将请求从一个Servlet传递给另一个Web资源，请求其他资源进行响应
         d.forward(request, response);
    }

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

        doGet(request, response);
    }

}


----------
package com.demo;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ResultServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;


    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html  ;charset=utf-8");
        PrintWriter  out=response.getWriter();
        //1.Servlet之间数据共享
        String hobby=(String) request.getAttribute("hobby");
        if(hobby!=null){
            out.println("我的爱好是"+hobby);
        }
    }


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

        doGet(request, response);
    }

}


----------
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>Project01</display-name>
  <servlet>
    <servlet-name>demo</servlet-name>
    <servlet-class>com.demo.ForwordServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>demo</servlet-name>
    <url-pattern>/forwordServlet</url-pattern>
  </servlet-mapping>
  <servlet>
    <servlet-name>demo1</servlet-name>
    <servlet-class>com.demo.ResultServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>demo1</servlet-name>
    <url-pattern>/resultServlet</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
  </welcome-file-list>
</web-app>

结果：
这里写图片描述