Struts2 内置验证器的使用例子

package com.itheima.action;

import java.util.Date;

import com.opensymphony.xwork2.ActionSupport;

public class StudentAction extends ActionSupport {
private String username;
private String password;
private String repassword;
private String email;
private Date birthday;
private String netaddress;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getRepassword() {
return repassword;
}
public void setRepassword(String repassword) {
this.repassword = repassword;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getNetaddress() {
return netaddress;
}
public void setNetaddress(String netaddress) {
this.netaddress = netaddress;
}
public String regist(){
System.out.println(this);
return SUCCESS;
}
@Override
public String toString() {
return "StudentAction [username=" + username + ", password=" + password
+ ", repassword=" + repassword + ", email=" + email
+ ", birthday=" + birthday + ", netaddress=" + netaddress + "]";
}

}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC
"-//Apache Struts//XWork Validator 1.0.3//EN"
"http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd">
<validators>
<field name="username">
<field-validator type="requiredstring">
<message>名字不能为空</message>
</field-validator>
<field-validator type="regex">
<param name="regex">
<![CDATA[[a-zA-Z]{3,8}]]>
</param>
<message>名字必须由3~8位字母组成</message>
</field-validator>
</field>
<field name="password">
<field-validator type="requiredstring">
<message>密码不能为空</message>
</field-validator>
<field-validator type="strong">
<message>密码必须由至少一个大写和小写和数字组成</message>
</field-validator>
</field>
<!-- 非字段验证 :要使用s:actionError显示错误提示-->
<validator type="expression">
<param name="expression">
repassword==password
</param>
<message>两次密码必须一致</message>
</validator>
<field name="email">
<field-validator type="email">
<message>请输入正确的邮箱</message>
</field-validator>
</field>
<field name="birthday">
<field-validator type="date">
<param name="min">2000-01-01</param>
<param name="max">2010-12-31</param>
<message>请输入正确的日期</message>
</field-validator>
</field>
<field name="netaddress">
<field-validator type="url">
<message>请输入正确的地址:协议_主机_资源地址</message>
</field-validator>
</field>
</validators>