「Servlet」GetメソッドでURLのパラメータの値を取得するサンプル

2021年4月15日

書式
request.getParameter(“name")
request.getParameter(“url")
使用例

package com.arkgame.study;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class StudyForm
 */
@WebServlet("/StudyForm")
public class StudyForm extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public HelloForm() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // コンテンツタイプの設定
        response.setContentType("text/html;charset=UTF-8");

        PrintWriter out = response.getWriter();
        String title = "Getメソッドでフォームのデータを取得";
        // 文字化け
        String name =new String(request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8");
        String docType = "<!DOCTYPE html> \n";
        out.println(docType +
            "<html>\n" +
            "<head><title>" + title + "</title></head>\n" +
            "<body bgcolor=\"#f0f0f0\">\n" +
            "<h1 align=\"center\">" + title + "</h1>\n" +
            "<ul>\n" +
            "  <li><b>SiteName</b>："
            + name + "\n" +
            "  <li><b>HomePage</b>："
            + request.getParameter("url") + "\n" +
            "</ul>\n" +
            "</body></html>");
    }
    
    // postメソッドでリクエストを受ける
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}

web.xmlの定義

<?xml version="1.0" encoding="UTF-8"?>
<web-app>
  <servlet>
    <servlet-name>StudyForm</servlet-name>
    <servlet-class>com.arkgame.study.StudyForm</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>StudyForm</servlet-name>
    <url-pattern>/TomcatTest/StudyForm</url-pattern>
  </servlet-mapping>
</web-app>

確認URL
http://localhost:8080/TomcatTest/HelloForm?name=info&url=www.arkgame.com

Servlet

Posted by arkgame

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