JavaWeb企业实训(一)servlet检测输入为空

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form表单提交与url大同小异。

Myeclipse创建servlet会自动配置web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app version="3.0"    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_3_0.xsd">  <servlet>    <description>This is the description of my J2EE component</description>    <display-name>This is the display name of my J2EE component</display-name>    <servlet-name>CheckServlet</servlet-name>    <servlet-class>cn.edu.bzu.py.servlet.CheckServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>CheckServlet</servlet-name>    <url-pattern>/servlet/CheckServlet</url-pattern>  </servlet-mapping></web-app>

CheckServlet.java

package cn.edu.bzu.py.servlet;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 CheckServlet extends HttpServlet {public CheckServlet() {super();}public void destroy() {super.destroy(); // Just puts "destroy" string in log// Put your code here}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//System.out.println("hahahha");//检查输入是否为空String name = request.getParameter("uname");response.setContentType("text/html;charset=utf8");PrintWriter out = response.getWriter();out.println("输入"+name);out.close();}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}public void init() throws ServletException {// Put your code here}}

把项目部署到tomcat之后，使用下面的url访问这个Servlet

http://localhost:8080/MyJavaWeb/servlet/CheckServlet?uname=123

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