Servlet表单数据处理-优快云博客

本文链接：https://blog.youkuaiyun.com/Begin_W_T_E_I_M/article/details/89577744

（一）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。

accept.java:

public class accept extends HttpServlet
{  
	public String codeToString(String str)
  {//处理中文字符串的函数
    String s=null;
    try
      {
      byte tempB[]=s.getBytes("ISO-8859-1",”utf-8”);
      s=new String(tempB);
      return s;
  }
  catch(Exception e)
    {
    return s;
    }
  }
  public void init(ServletConfig config) throws ServletException
    {
      super.init(config);
    }
  public  void  doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {
       //设置mime
       response.setContentType("text/html;charset=utf-8");
       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>");
    } 
}

<%@ page contentType="text/html;charset=utf-8"%>
<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&nbsp; 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>

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