runoops.com

Servlet 教程

Servlet 处理复选框数据

当需要选择一个以上的选项时，则使用复选框。

下面是一个 HTML 代码实例 checkbox.html，一个带有两个复选框的表单。

实例

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>runoops 自学教程</title>
</head>
<body>
	<form action="FormCheckboxServlet" method="POST" target="_blank">
		<input type="checkbox" name="runoops" checked="checked" /> 自学教程 <input
			type="checkbox" name="google" /> Google <input type="checkbox"
			name="taobao" checked="checked" /> 淘宝 <input type="submit"
			value="选择站点" />
	</form>
</body>
</html>

下面是 FormCheckboxServlet.java Servlet 程序，处理 Web 浏览器给出的复选框输入。

实例

package com.runoops.test;

import java.io.*;
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 FormCheckboxServlet
 */
@WebServlet("/FormCheckboxServlet")
public class FormCheckboxServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public FormCheckboxServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// 设置响应内容类型
        response.setContentType("text/html;charset=UTF-8");

        PrintWriter out = response.getWriter();
        String title = "读取复选框数据";
        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>runoops 自学教程：</b> "
                + request.getParameter("runoops") + "\n" +
                "  <li><b>Google 标识：</b> "
                + request.getParameter("google") + "\n" +
                "  <li><b>淘宝标识：</b> "
                + request.getParameter("taobao") + "\n" +
                "</ul>\n" +
                "</body></html>");
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

上面的Servlet 类已经用了@WebServlet 注解，web.xml中可以不用配置。

上面的实例将显示下面的结果：

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