javaweb入门实例---servlet例子

最新推荐文章于 2025-08-15 16:04:36 发布

maggiehexu

最新推荐文章于 2025-08-15 16:04:36 发布

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分类专栏： javaweb 文章标签： servlet string encoding class 测试

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本文介绍了一个简单的Servlet实例，包括TreeDataServlet的编写过程、web.xml的配置方法及如何通过HTTP请求获取并展示返回的数据。

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1.编写servlet: TreeDataServlet.java

package com.maggie.tree; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class TreeDataServlet extends HttpServlet{ private String getData(){ StringBuffer sb = new StringBuffer(); sb.append("Hello~First Servlet!"); return sb.toString(); } @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // TODO Auto-generated method stub // super.doGet(req, resp); String data = this.getData(); resp.setContentType("text/html;charset=GBK"); resp.getOutputStream().write(data.getBytes("GBK")); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // TODO Auto-generated method stub // super.doPost(req, resp); } }

2.配置web.xml

<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet> <servlet-name>treeServlet</servlet-name> <servlet-class> com.maggie.tree.TreeDataServlet </servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>treeServlet</servlet-name> <url-pattern>/treeServlet</url-pattern> </servlet-mapping> </web-app>

3.测试，访问地址：http://localhost:8080/fistServlet/treeServlet

页面显示如下：

Hello~First Servlet!