[jsp]使用HttpServlet的例子中的代码

最新推荐文章于 2023-09-14 18:35:03 发布

原创最新推荐文章于 2023-09-14 18:35:03 发布 · 3.4k 阅读

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CC 4.0 BY-SA版权

文章标签：

#jsp #servlet #encoding #string #class #html

本文将介绍如何使用HTTP Servlet实现一个简单的响应页面，包括设置编码、获取请求参数并展示用户信息。

\02\src\sunyang

package sunyang;

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 HttpServletSample extends HttpServlet {

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

       resp.setCharacterEncoding("GBK");//设置响应的编码类型为GBK
       PrintWriter out=resp.getWriter();//获取输出对象
       out.println("<html>");
       out.println("<head>");
       out.println("<title>HttpServlet简单例子</title>");
       out.println("</head>");
       out.println("<body>");
       String name=req.getParameter("name");//获取请求的参数
       if(name==null||name.equals("")){
           name="sunyang";
       }
       out.println("<h2>你好，"+name+"<br>这是使用HttpServlet的例子</h2>");
       out.println("</body>");
       out.println("</html>");
       out.close();//关闭输出对象
   }

   protected void doPost(HttpServletRequest req, HttpServletResponse resp)
           throws ServletException, IOException {
       this.doGet(req, resp);
   }

}

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>ServletSample</servlet-name>
       <servlet-class>sunyang.HttpServletSample</servlet-class>
   </servlet>
   
   <servlet-mapping>
       <servlet-name>ServletSample</servlet-name>
       <url-pattern>/httpServlet</url-pattern>
   </servlet-mapping>
</web-app>