–Form 表单简介
–创建并提交表单
–使用Servlet处理表单
 • 读取单个请求参数
• 读取多个表单
• 读取所有参数名称
–实例
 • 注册会员
###############Michael分割线#################
–Form 表单简介
• 表单是web程序和用户交互的主要途径之一，例如：搜索引擎、用户登录、注册等操作都离不开表单的使用
• 常用表单元素
–input
» text
» password
» radio
» checkbox
» hidden
» file
» button
» reset
» submit
–select
» option
–textarea
• 创建并提交表单
–一个简单的表单（例如：登录），如下所示

–当单击“登录”按钮时表单被提交
• 使用Servlet处理表单
–读取单个请求参数
• String user = request.getParameter(“user”);
RegisterServlet.java
package com.michael.servletform;    
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 RegisterServlet extends HttpServlet {    
        /**    
         * Constructor of the object.    
         */    
        public RegisterServlet() {    
                super();    
        }    
        /**    
         * Destruction of the servlet. <br>    
         */    
        public void destroy() {    
                super.destroy(); // Just puts "destroy" string in log    
                // Put your code here    
        }    
        /**    
         * The doGet method of the servlet. <br>    
         *    
         * This method is called when a form has its tag value method equals to get.    
         *    
         * @param request the request send by the client to the server    
         * @param response the response send by the server to the client    
         * @throws ServletException if an error occurred    
         * @throws IOException if an error occurred    
         */    
        public void doGet(HttpServletRequest request, HttpServletResponse response)    
                        throws ServletException, IOException {    
                String username = request.getParameter("username");    
                String password = request.getParameter("password");    
                response.setContentType("text/html");    
                PrintWriter out = response.getWriter();    
                out    
                                .println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");    
                out.println("<HTML>");    
                out.println("    <HEAD><TITLE>A Servlet</TITLE></HEAD>");    
                out.println("    <BODY>");    
                out.println("username:"+username);    
                out.println("username:"+password);    
                out.println("    </BODY>");    
                out.println("</HTML>");    
                out.flush();    
                out.close();    
        }    
        /**    
         * The doPost method of the servlet. <br>    
         *    
         * This method is called when a form has its tag value method equals to post.    
         *    
         * @param request the request send by the client to the server    
         * @param response the response send by the server to the client    
         * @throws ServletException if an error occurred    
         * @throws IOException if an error occurred    
         */    
        public void doPost(HttpServletRequest request, HttpServletResponse response)    
                        throws ServletException, IOException {    
                doGet(request,response);    
        }    
        /**    
         * Initialization of the servlet. <br>    
         *    
         * @throws ServletException if an error occure    
         */    
        public void init() throws ServletException {    
                // Put your code here    
        }    
}
register.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">    
<html>    
    <head>    
        <title>register.html</title>    
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    
        <meta http-equiv="description" content="this is my page">    
        <meta http-equiv="content-type" content="text/html; charset=UTF-8">    
        <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->    
    </head>    
    <body>    
        <form action="/Servlet_Form/servlet/RegisterServlet" method="post">    
        用户名称：<input type="text" name="username"><br>    
        用户密码：<input type="password" name="password"><br>    
        <input type="submit" value="注册">    
    </body>    
</html>
web.xml
<?xml version="1.0" encoding="UTF-8"?>    
<web-app version="2.4"    
        xmlns="http://java.sun.com/xml/ns/j2ee"    
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    
        xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee    
http://java.sun.com/xml/ns/j2ee/web-app_2_4.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>RegisterServlet</servlet-name>    
        <servlet-class>com.michael.servletform.RegisterServlet</servlet-class>    
    </servlet>    
    <servlet-mapping>    
        <servlet-name>RegisterServlet</servlet-name>    
        <url-pattern>/servlet/RegisterServlet</url-pattern>    
    </servlet-mapping>    
</web-app>

测试

–读取多个表单
• String[] hobby = request.getParameterValues(“hobby”);

register.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">    
<html>    
    <head>    
        <title>register.html</title>    
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    
        <meta http-equiv="description" content="this is my page">    
        <meta http-equiv="content-type" content="text/html; charset=UTF-8">    
        <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->    
    </head>    
    <body>    
        <form action="/Servlet_Form/servlet/RegisterServlet" method="post">    
        用户名称：<input type="text" name="username"><br>    
        用户密码：<input type="password" name="password"><br>    
        用户爱好：<input type="checkbox" name="hobby" value="1">游泳    
                        <input type="checkbox" name="hobby" value="2">足球<br>    
        <input type="submit" value="注册">    
    </body>    
</html>
RegisterServlet.java
package com.michael.servletform;    
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 RegisterServlet extends HttpServlet {    
        /**    
         * Constructor of the object.    
         */    
        public RegisterServlet() {    
                super();    
        }    
        /**    
         * Destruction of the servlet. <br>    
         */    
        public void destroy() {    
                super.destroy(); // Just puts "destroy" string in log    
                // Put your code here    
        }    
        /**    
         * The doGet method of the servlet. <br>    
         *    
         * This method is called when a form has its tag value method equals to get.    
         *    
         * @param request the request send by the client to the server    
         * @param response the response send by the server to the client    
         * @throws ServletException if an error occurred    
         * @throws IOException if an error occurred    
         */    
        public void doGet(HttpServletRequest request, HttpServletResponse response)    
                        throws ServletException, IOException {    
                String username = request.getParameter("username");    
                String password = request.getParameter("password");    
                String[] hobby = request.getParameterValues("hobby");    
                if(hobby!=null&&hobby.length>0){    
                        for(int i=0;i<hobby.length;i++){    
                                System.out.println(hobby[i]);    
                        }    
                }    
                response.setContentType("text/html");    
                PrintWriter out = response.getWriter();    
                out    
                                .println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");    
                out.println("<HTML>");    
                out.println("    <HEAD><TITLE>A Servlet</TITLE></HEAD>");    
                out.println("    <BODY>");    
                out.println("username:"+username);    
                out.println("password:"+password);    
                out.println("    </BODY>");    
                out.println("</HTML>");    
                out.flush();    
                out.close();    
        }    
        /**    
         * The doPost method of the servlet. <br>    
         *    
         * This method is called when a form has its tag value method equals to post.    
         *    
         * @param request the request send by the client to the server    
         * @param response the response send by the server to the client    
         * @throws ServletException if an error occurred    
         * @throws IOException if an error occurred    
         */    
        public void doPost(HttpServletRequest request, HttpServletResponse response)    
                        throws ServletException, IOException {    
                doGet(request,response);    
        }    
        /**    
         * Initialization of the servlet. <br>    
         *    
         * @throws ServletException if an error occure    
         */    
        public void init() throws ServletException {    
                // Put your code here    
        }    
}
测试一下
hobby输出到控制台了
##########Michael分割线################

Java EE WEB工程师培训-JDBC+Servlet+JSP整合开发之13.Form表单处理(1)相关推荐

  1. Java EE WEB工程师培训-JDBC+Servlet+JSP整合开发之14.Servlet请求头信息

    –典型的请求头信息 –读取HTTP请求头 –使用表格显示所有请求头信息 –理解各种请求头的含义 –区分不同的浏览器类型 ##############Michael分割线################ ...

  2. Java EE WEB工程师培训-JDBC+Servlet+JSP整合开发之12.Servlet基础(2)

    –提交表单的方法 • get • post –Servlet 生命周期 –使用Servlet 输出HTML页面 –获得Servlet初始化参数 –页面导航 • 请求重定向 –response.send ...

  3. Java EE WEB工程师培训-JDBC+Servlet+JSP整合开发之10.Web_工程结构

    –简介 –Web应用程序的思想 –Web应用程序的目的 –Web工程结构 –web.xml 文件 –实例 • 创建一个简单的web应用程序 • 部署到tomcat中来运行 ############## ...

  4. Java EE WEB工程师培训-JDBC+Servlet+JSP整合开发之06.JDBC PreparedStatement

    –PreparedStatement –为占位符"?"赋值 –使用PreparedStatement动态执行SQL语句 ####################Michael分割线 ...

  5. JDBC+Servlet+JSP整合开发之25.JSP动作元素

    –jsp:useBean –jsp:setProperty –jsp:getProperty –jsp:forward –jsp:include –jsp:param –实例 ?计算器 ------- ...

  6. JDBC+Servlet+JSP整合开发之22.JSP简介

    –对JSP的需求 –JSP的结构 –JSP的好处 –JSP实例 ?创建一个简单的JSP页面 ########################################### ? JSP –JSP ...

  7. JDBC+Servlet+JSP整合开发之26.JSP内建对象

    –使用内建对象的目的  –内建对象  –out 内建对象  –request 内建对象  –response 对象  –session 内建对象  –pageContext 内建对象  –applic ...

  8. JDBC+Servlet+JSP整合开发之30-JDBC、Servlet、JSP的MVC

    –Servlet 的优势与弊端 –JSP 的优势与弊端 –MVC 设计模式 –实例 ?使用MVC实现学生信息的添加.显示 -----------------------------START----- ...

  9. JDBC+Servlet+JSP整合开发之29-JSP表达式语言（EL）

    –EL 简介  –EL的应用场合  –EL 的基本语法  –EL中的算术运算符  –EL中的关系运算符  –EL中的逻辑运算符 ------------------------------START- ...

最新文章

  1. 蓝桥杯国赛知识点汇总
  2. C#的委托事件在winform窗体中实现传值备忘
  3. linux shell 数组遍历方式（非原创）
  4. 欢迎使用markdown编辑器20181206
  5. linux grep sed awk
  6. oracle测试没响应,Oracle JDBC 没响应，是不是BUG？
  7. jcmd:JDK14中的调试神器
  8. Linux shell multifile content replace with sed
  9. 附录：更多集合操作命令
  10. 使用Lucene索引和检索POI数据
  11. Reids 批量删除有相同前缀的keys
  12. 在Linux中如何使用gdb调试C程序
  13. 使用 ASM 实现 Java 语言的“多重继承”
  14. 清明上河图轴卷图滑动
  15. vue项目接入高拍仪
  16. Veil-Evasion免杀
  17. android-759b1c是什么,[原创]hooker + jadx 动静结合内存漫游窥视某社交软件视频号功能的数据...
  18. 农村信用社答题小程序
  19. Codeforces Round #439 (Div. 2) E. The Untended Antiquity 二维线段树||二维树状数组
  20. CS106B Assignment #4：Boggle

热门文章

  1. SQLmap工具常用命令
  2. Wireshark安装失败或找不到网络接口问题
  3. XamarinAndroid组件教程RecylerView动画组件使用动画(2)
  4. 单选框_vue实现单选框自定义样式
  5. https open api_钉钉API发送消息
  6. mfc程序转化为qt_工控编程，Qt 学习之路
  7. centos6.5下载卸载mysql_Linux CentOS 6.5 卸载、tar安装MySQL
  8. uni上传图片跨域_uni-app的项目实践心得
  9. 重磅！Nature子刊：利用GAN来​“深度伪造大脑数据”可以改善残疾人的脑机接口...
  10. android开发常见的设计模式,Android开发有哪些常用设计模式？