Servlet(三)HttpServlet

標籤：javaee   httpservlet   doget   

以HttpServlet建立Servlet

1、在FirstServlet同目錄下建立HServlet.java

package com.hunhun;import javax.servlet.*;import javax.servlet.http.*;import java.io.*;import java.util.*;public class HServlet extends HttpServlet{<span style="white-space:pre"></span>protected void doGet(HttpServletRequest req,                     HttpServletResponse resp)              throws ServletException,                     IOException{         resp.getWriter().println("doGet"+req.getParameter("username"));    }        protected void doPost(HttpServletRequest req,                      HttpServletResponse resp)               throws ServletException,                      IOException{         resp.getWriter().println("doPost"+req.getParameter("username"));    }}

2、web.xml

<?xml version="1.0" encoding="ISO-8859-1"?><web-app 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"  version="3.0"  metadata-complete="true">    <servlet>        <servlet-name>FirstServlet</servlet-name>        <servlet-class>com.hunhun.FirstServlet</servlet-class>    </servlet>    <servlet-mapping>        <servlet-name>FirstServlet</servlet-name>        <url-pattern>/FirstServlet</url-pattern>    </servlet-mapping>    <servlet>        <servlet-name>GServlet</servlet-name>        <servlet-class>com.hunhun.GServlet</servlet-class>    </servlet>    <servlet-mapping>        <servlet-name>GServlet</servlet-name>        <url-pattern>/GServlet</url-pattern>    </servlet-mapping>    <servlet>        <servlet-name>HServlet</servlet-name>        <servlet-class>com.hunhun.HServlet</servlet-class>    </servlet>    <servlet-mapping>        <servlet-name>HServlet</servlet-name>        <url-pattern>/HServlet</url-pattern>    </servlet-mapping></web-app>

3、編譯檔案，reload myweb項目，注意每次重新修改*Servlet.java檔案,都需要重新編譯，並重新載入 myweb項目或重啟tomcat7

4、瀏覽器訪問 http://localhost:8080/myweb/HServlet?username=hunhun，可看到

doGethunhun

5、在myweb目錄下建立login.html檔案

<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>登入</title></head><body><form action="/myweb/HServlet"  method="post">使用者名稱：<input type="text" name="username"><input type="submit" value="登入"></form></body></html>

6.瀏覽器訪問http://localhost:8080/myweb/login.html,填寫使用者名稱登陸則可看到

doPosthunhun

Servlet(三)HttpServlet