<body>
<script type="text/javascript">
function yz() {
if (form1.userName.value == "") {
alert("用户名不能为空");
form1.userName.focus();
return form1();
}
if (form1.userPassword.value == "") {
alert("密码不能为空");
form1.userPassword.focus();
return form1();
}
form1.registerid();
}
</script>
<form action="register" method="post" name="form1">
<table>
<tr>
<td>用户名：</td>
<td><input type="text" name="userName" id="userName"
placeholder="请输入用户名"></td>
</tr>
<tr>
<td>密码：</td>
<td><input type="password" name="userPassword"
id="userPassword" placeholder="请输入密码"></td>
</tr>
<tr>
<td><br></td>
</tr>
<tr>
<td><input type="submit" name="registerid" value="注册"
onClick="yz()"></td>
</tr>
</table>
</form>
</body>
index.jsp
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); response.setCharacterEncoding("utf-8"); PrintWriter out = response.getWriter(); String userName = request.getParameter("userName"); String userPassword = request.getParameter("userPassword"); if (userName=="" || userPassword=="") { System.out.println("注册失败"); response.sendRedirect("index.jsp"); }else{ System.out.println("注册成功"); System.out.println("用户名：" + userName + "密码：" + userPassword); request.getRequestDispatcher("login.jsp").forward(request, response); } out.flush(); out.close(); } register.java
