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Struts2中提供了数据校验验证数据例如验证邮件、数字等。验证方式有3种:一是通过validate()方法，二是通过Xml，三是使用注解方式。
一、初始化
首先定义一个User类
package com.cyw.test;
import java.util.Date;
public class User {
private String name;
private int age;
private String email;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
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;
}
private Date birthDay;
}
</div>
二、validate()方法验证
可以在继承了ActionSupport的Action中重写validate()来进行验证。validate()方法会在execute()方法执行前执行，仅当数据校验正确，才执行execute()方法， 如错误则将错误添加到fieldErrors域中，如果定义的Action中存在多个逻辑处理方法，且不同的处理逻辑需要不同的校验规则，这种情况下validate()会对所有处理逻辑使用相同的校验规则，为了实现不同的校验逻辑，需要通过validateX()方法，其中X表示处理逻辑的方法名,如果有错误系统会返回result name="input"的页面，所以需要在action中定义一个input的result。我昨天就困在这个地方好久。问了我大学同学才解决，为了这个validate()验证昨晚一点多都没睡，虽然SSH框架现在不流行，特别是前几天struts2报了一个远程bug，不过想着既然学java了，就系统的学一遍吧。
1.validate()方法
package com.cyw.test;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.opensymphony.xwork2.ActionSupport;
public class ValidatorAction extends ActionSupport {
private User user;
private List<User>userList=new ArrayList<User>();
public List<User> getUserList() {
return userList;
}
public void setUserList(List<User> userList) {
this.userList = userList;
}
@Override
public String execute() throws Exception {
if(user==null || this.hasFieldErrors())
{
return "regist";
}
else
{
return "success";
}
}
public String addUser()
{
userList.add(user);
return "success";
}
private static final long serialVersionUID = 1L;
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
@Override
public void validate() {
if(user!=null)
{
if(!dataPass( user.getName(),"^[A-Za-z][A-Za-z1-9_-]+$"))
{
addFieldError("user.name", "用户名（字母开头 + 数字/字母/下划线）");
}
if(!dataPass(String.format("%d", user.getAge()) ,"(?:[1-9][0-9]?|1[01][0-9]|120)"))
{
addFieldError("user.name", "年龄0-120之间");
}
Date startDate=strToDate("1900-01-01");
Date endDate=strToDate("2017-01-01");
if(user.getBirthDay().before(startDate) || user.getBirthDay().after(endDate) )
{
addFieldError("birthDay", "出生日期在1900-01-01至2017-01-01之间。");
}
if(!dataPass(user.getEmail(),"^[a-zA-Z_]{1,}[0-9]{0,}@(([a-zA-z0-9]-*){1,}\\.){1,3}[a-zA-z\\-]{1,}$"))
{
addFieldError("email", "邮箱格式不符合");
}
}
}
private Date strToDate(String strDate)
{
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
ParsePosition pos = new ParsePosition(0);
Date strtodate = formatter.parse(strDate, pos);
return strtodate;
}
private boolean dataPass(String str,String regEx)
{
Pattern pattern=Pattern.compile(regEx,Pattern.CASE_INSENSITIVE);
Matcher matcher =pattern.matcher(str);
return matcher.matches();
}
}
</div>
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN" "http://struts.apache.org/dtds/struts-2.5.dtd"> <struts> <package name="default" namespace="" extends="struts-default"> <action name="regist" class="com.cyw.test.ValidatorAction"> <result name="regist">/register.jsp</result> <result name="success">/success.jsp</result> <result name="input">/register.jsp</result> </action> </package> </struts></div>
2.validateX()方法
package com.cyw.test;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.opensymphony.xwork2.ActionSupport;
public class ValidatorAction extends ActionSupport {
private User user;
private List<User>userList=new ArrayList<User>();
public List<User> getUserList() {
return userList;
}
public void setUserList(List<User> userList) {
this.userList = userList;
}
public String addUser()
{
if(user==null)
{
return "regist";
}
userList.add(user);
return "success";
}
private static final long serialVersionUID = 1L;
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public void validateAddUser() {
if(user!=null)
{
if(!dataPass( user.getName(),"^[A-Za-z][A-Za-z1-9_-]+$"))
{
addFieldError("user.name", "用户名（字母开头 + 数字/字母/下划线）");
}
if(!dataPass(String.format("%d", user.getAge()) ,"(?:[1-9][0-9]?|1[01][0-9]|120)"))
{
addFieldError("user.name", "年龄0-120之间");
}
Date startDate=strToDate("1900-01-01");
Date endDate=strToDate("2017-01-01");
if(user.getBirthDay().before(startDate) || user.getBirthDay().after(endDate) )
{
addFieldError("birthDay", "出生日期在1900-01-01至2017-01-01之间。");
}
if(!dataPass(user.getEmail(),"^[a-zA-Z_]{1,}[0-9]{0,}@(([a-zA-z0-9]-*){1,}\\.){1,3}[a-zA-z\\-]{1,}$"))
{
addFieldError("email", "邮箱格式不符合");
}
}
}
private Date strToDate(String strDate)
{
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
ParsePosition pos = new ParsePosition(0);
Date strtodate = formatter.parse(strDate, pos);
return strtodate;
}
private boolean dataPass(String str,String regEx)
{
Pattern pattern=Pattern.compile(regEx,Pattern.CASE_INSENSITIVE);
Matcher matcher =pattern.matcher(str);
return matcher.matches();
}
}
</div>
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN" "http://struts.apache.org/dtds/struts-2.5.dtd"> <struts> <package name="default" namespace="" extends="struts-default"> <action name="regist" class="com.cyw.test.ValidatorAction" method="addUser"> <result name="regist">/register.jsp</result> <result name="success">/success.jsp</result> <result name="input">/register.jsp</result> </action> </package> </struts></div>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ tagl