用Servlet获取表单数据
建立一个Servlet文件accept.java和一个register.jsp文件，实现用Servlet实现获取表单数据的功能。
程序功能：利用Servlet的方式实现表单数据的获取。
参考源代码：
accept.java
package servlets;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class accept extends HttpServlet
{
public String codeToString(String str)
{//处理中文字符串的函数
String s=str;
try
{
byte tempB[]=s.getBytes("ISO-8859-1");
s=new String(tempB);
return s;
}
catch(Exception e)
{
return s;
}
}
public void init(ServletConfig config) throws ServletException
{
super.init(config);
}
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException
{
//设置mime
response.setContentType("text/html;charset=GB2312");
PrintWriter out=response.getWriter();
out.println("<HTML><head><title>接收新用户注册</title></head><BODY>");
out.println("这是新用户注册所提交的数据：<br>");
out.println("用户名是："+codeToString(request.getParameter("username"))+"<br>");
out.println("密码是："+codeToString(request.getParameter("userpassword"))+"<br>");
out.println("性别是："+codeToString(request.getParameter("sex"))+"<br>");
out.println("出生年月是："+request.getParameter("year")+request.getParameter("month")+request.getParameter("day")+"<br>");
out.println("电子邮箱是："+request.getParameter("email")+"<br>");
out.println("家庭住址是："+codeToString(request.getParameter("address"))+"<br>");
out.println("</body> </html>");
}
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException
{
doGet(request,response);
}
}
register.jsp
<%@ page contentType="text/html;charset=gb2312"%>
<script language="javascript">
function on_submit() { //验证数据的合法性
if (form1.username.value == "") {
alert("用户名不能为空，请输入用户名！");
form1.username.focus();
return false;
}
if (form1.userpassword.value == "") {
alert("用户密码不能为空，请输入密码！");
form1.userpassword.focus();
return false;
}
if (form1.reuserpassword.value == "") {
alert("用户确认密码不能为空，请输入密码！");
form1.reuserpassword.focus();
return false;
}
if (form1.userpassword.value != form1.reuserpassword.value) {
alert("密码与确认密码不同");
form1.userpassword.focus();
return false;
}
if (form1.email.value.length != 0) {
for (i = 0; i < form1.email.value.length; i++)
if (form1.email.value.charAt(i) == "@")
break;
if (i == form1.email.value.length) {
alert("非法EMail地址！");
form1.email.focus();
return false;
}
} else {
alert("请输入Email！");
form1.email.focus();
return false;
}
}
</script>
<html>
<head>
<title>新用户注册</title>
</head>
<body>
<form method="POST" action="servlet/accept" name="form1"
onsubmit="return on_submit()">
新用户注册<br> 用户名(*)：<input type="text" name="username" size="20"><br>
密 码(*)：<input type="password" name="userpassword" size="20"><br>
再输一次密码(*)：<input type="password" name="reuserpassword" size="20"><br>
性别：<input type="radio" value="男" checked name="sex">男<input
type="radio" name="sex" value="女">女<br> 出生年月：<input
name="year" size="4" maxlength=4>年 <select name="month">
<option value="1" selected>1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="8">7</option>
<option value="9">9</option>
<option value="10">10</option>
<option value="11">11</option>
<option value="12">12</option>
</select>月 <input name="day" size="3" maxlength=4>日<br> 电子邮箱(*)：<input
name="email" maxlength=28><br> 家庭住址：<input type="text"
name="address" size="20"><br> <input type="submit"
value="提交" name="B1"><input type="reset" value="全部重写"
name="B2"><br>
</form>
</body>
</html>
编译并运行程序。