在服务器端，主要重写validate（）方法
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package validate;
import com.opensymphony.xwork2.ActionSupport;
public class RegistAction1 extends ActionSupport{
private String userName;
private String userPassword;
private int userAge;
private String userTelephone;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserPassword() {
return userPassword;
}
public void setUserPassword(String userPassword) {
this.userPassword = userPassword;
}
public int getUserAge() {
return userAge;
}
public void setUserAge(int userAge) {
this.userAge = userAge;
}
public String getUserTelephone() {
return userTelephone;
}
public void setUserTelephone(String userTelephone) {
this.userTelephone = userTelephone;
}
public void validate(){
if(userName==null ||userName.length()<6 || userName.length()>16){
addFieldError("userName","用户姓名的长度不符合要求,6-16位！");
}
if(userPassword.length()>16||userPassword.length()<6){
addFieldError("userPassword","密码长度不符合要求，6-16位！");
}
if(userAge>130||userAge<1){
addFieldError("userAge","年龄不符合要求，1-130岁");
}
if(userTelephone.length()!=8){
addFieldError("userTelephone","电话号码不符合要求，8位");
}
}
public String execute(){
return SUCCESS;
}
}
在客户端我们可以使用javascript与ajax等
<%@ page contentType="text/html; charset=UTF-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>用户注册页面</title>
<!--检验输入表单数据的函数-->
<script language="JavaScript">
function trim(str)
{
//使用正则式去掉字符的前后空格
return str.replace(/^\s*/,"").replace(/\s*$/,"");
}
function check(form)
{
//定义错误标志字符串
var errorStr="";
//提取表单的4个数据
var userName=trim(form.userName.value);
var userPassword=trim(form.userPassword.value);
var userAge=trim(form.userAge.value);
var userTelephone=trim(form.userTelephone.value);
var pattern = /^\d{8}$/;
//判断用户名是否为空
if(userName==null||userName=="")
{
errorStr="用户名不能为空！";
}
else if(userPassword.length>16||userPassword.length<6)
{
errorStr="密码长度必须在6－16之间";
}
else if(userAge>130||userAge<0)
{
errorStr="年龄必须在0－130之间";
}
else if(!pattern.test(userTelephone))
{
errorStr="电话号码为8位阿拉伯数字组成！";
}
if(errorStr=="")
{
return true;
}
else
{
alert(errorStr);
return false;
}
}
</script>
</head>
<body>
<center>
请输入注册信息...
<hr>
<s:form action="register.action" method="post" onSubmit="return check(this);">
<table border="1">
<tr>
<td>
<s:textfield name="userName" label="姓名" size="16"/>
</td>
</tr>
<tr>
<td>
<s:password name="userPassword" label="密码" size="18"/>
</td>
</tr>
<tr>
<td>
<s:textfield name="userAge" label="年龄" size="16"/>
</td>
</tr>
<tr>
<td>
<s:textfield name="userTelephone" label="电话" size="16"/>
</td>
</tr>
<tr>
<td><s:submit value="提交"/></td>
</tr>
</table>
</s:form>
</center>
</body>
</html>