摘要

表单是后端程序员用的与接触最多的，我这里例举了常用处理办法，与注意事项

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sevlet处理代码

package myform;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Enumeration;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class resvrcData extends HttpServlet {

    @Override

    protected void doGet(HttpServletRequest req, HttpServletResponse resp)

            throws ServletException, IOException {

        // TODO Auto-generated method stub

        // super.doGet(req, resp);

        doPost(req, resp);

    }

    @Override

    protected void doPost(HttpServletRequest req, HttpServletResponse resp)

            throws ServletException, IOException {

        // TODO Auto-generated method stub

        // super.doPost(req, resp);

        resp.setContentType("text/html;charset=UTF-8");

        resp.setCharacterEncoding("UTF-8");

        PrintWriter writer = resp.getWriter();

        Enumeration<String> names = req.getParameterNames();

        String parameter = req.getParameter("r");

        //System.out.println(parameter);

        while (names.hasMoreElements()) {

            //writer.write(names.nextElement());

            writer.write(req.getParameter(names.nextElement()));

        }

        writer.close();

    }

}

注意

我看了类似网上代码，忽略写servlet配置文件 在html写数据到servlet是会报404 错误代码的 所以必须配置

radiobox

checkbox

select

        <center>

            <!-- name的值相同才能做相同绑定 multiple="multiple"-->

            <form method="post" action="/SessionTchCookies/myform/resvrcData.do">

            <select name="select1" >

            <option value="o1">1</option>

            <option value="o2">2</option>

            <option value="o3">3</option>

            <option value="o4">4</option>

            </select>

             <input type="submit" value="提交"/>

            </form>

        </center>

包含optgroup表单的属性设置

<form method="post" action="/SessionTchCookies/myform/resvrcData.do">

            <br>

            <br> <select name="test" id="select">

                <ins>ss</ins>

                <optgroup label="num">

                    <option value="11" disabled>1</option>

                    <option value="22" selected>2</option>

                    <option value="33">3</option>

                    <option value="44" label="word">4</option>

                </optgroup>

                <optgroup label="word">

                    <option>a</option>

                    <option>b</option>

                    <option>c</option>

                    <option>d</option>

                </optgroup>

                <optgroup label="汉字" disabled>

                    <option value="一个">一</option>

                    <option value="二个">二</option>

                    <option value="三个">三</option>

                    <option value="四个">四</option>

                </optgroup>

            </select> <input type="submit">