Ví dụ truyền CheckBox trong Servlet

Ví dụ đọc tất cả Parameters của Form trong Servlet

CheckBox được sử dụng khi bạn cần chọn nhiều hơn một tùy chọn. Dưới đây là ví dụ truyền dữ liệu Checkbox sang chương trình Servlet.

Ví dụ truyền dữ liệu CheckBox trong Servlet

Tạo servlet CheckBoxAction để xử lý yêu cầu từ máy khách.

File: CheckBoxAction .java trong package vn.viettuts

package vn.viettuts;

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 CheckBoxAction extends HttpServlet {
    
    /**
     * Xu ly GET request
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
       throws ServletException, IOException {
       
       // Set response content type
       response.setContentType("text/html");

       PrintWriter out = response.getWriter();
       String title = "Doc du lieu tu CheckBox trong Servlet";
       String docType =
          "<!doctype html public \"-//w3c//dtd html 4.0 " + 
          "transitional//en\">\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>Toan : </b>: "
                   + request.getParameter("toan") + "\n" +
                   "  <li><b>Vat Ly: </b>: "
                   + request.getParameter("ly") + "\n" +
                   "  <li><b>Hoa Hoc: </b>: "
                   + request.getParameter("hoa") + "\n" +
                "</ul>\n" +
             "</body>" +
          "</html>"
       );
    }

    /**
     * Xu ly POST request
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
       throws ServletException, IOException {
       
       doGet(request, response);
    }
 }

Cấu hình servlet trong file web.xml

  <servlet>
    <servlet-name>CheckBoxAction</servlet-name>
    <servlet-class>vn.viettuts.CheckBoxAction</servlet-class>
  </servlet>
  
  <servlet-mapping>
    <servlet-name>CheckBoxAction</servlet-name>
    <url-pattern>/CheckBoxAction</url-pattern>
  </servlet-mapping>

Tạo trang checkbox.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
  <form action="CheckBoxAction" method="POST">
    <input type="checkbox" name="toan" checked="checked" /> Toan 
    <input type="checkbox" name="ly" /> Vat Ly
    <input type="checkbox" name="hoa" /> Hoa Hoc
    <input type="submit" value="Chon Mon Hoc" />
  </form>
</body>
</html>

Demo