＃02:投稿フォームを作ろう
ここでは、JavaでWebフォームを作る方法を学習します。そのために、ServletとJSPを使って、HTMLの投稿フォームを表示させてみましょう。
(tomcat/webapps/myform/FormServlet.java)
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class FormServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setAttribute("message", "Hello World");
String view = "/WEB-INF/views/form.jsp";
RequestDispatcher dispatcher = request.getRequestDispatcher(view);
dispatcher.forward(request, response);
}
}(tomcat/webapps/myform/WEB-INF/web.xml)
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0" metadata-complete="true">
<servlet>
<servlet-name>ShowForm</servlet-name>
<servlet-class>FormServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ShowForm</servlet-name>
<url-pattern>/show</url-pattern>
</servlet-mapping>
</web-app>(tomcat/webapps/myform/WEB-INF/views/form.jsp)
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html" charset="UTF-8">
<title>Java - paiza</title>
</head>
<body>
<% String message = (String)request.getAttribute("message");%>
<h1><%= message %></h1>
<form action="result" method="post" >
<label for="article">投稿</label>
<input type="text" name="article">
<p></p>
<label for="name">名前</label>
<input type="text" name="userName">
<button type="submit">送信する</button>
</form>
</body>
</html>$ javac -classpath "../../lib/servlet-api.jar" -d WEB-INF/classes FormServlet.java- Javaの道＞Servlet・JSP
https://www.javaroad.jp/servletjsp/index.html
- Servletアプリ開発：目次 - Web系開発メモ
http://web-dev.hatenablog.com/entry/java/servlet/dev-restful-app/table-of-contents
- JSP(formデータ)とJava Servletプログラムの連携 - はしくれエンジニアもどきのメモ
http://cartman0.hatenablog.com/entry/2015/12/08/181657