一、Struts2驗證簡介：

二、struts2內置驗證：

下面例子，需求是：為用戶註冊進行驗證；

com.cy.model.User.java:

package com.cy.model;

public class User {

    private String userName;
    private String name;
    private int age;
    private String email;
    private String homePage;
    public String getUserName() {
        return
 
 userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    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 String getHomePage() {
        return homePage;
    }
    public void setHomePage(String homePage) {
        this.homePage = homePage;
    }
    @Override
    
 
public String toString() {
        return "User [userName=" + userName + ", name=" + name + ", age=" + age
                + ", email=" + email + ", homePage=" + homePage + "]";
    }
    
    
}

com.cy.action.RegisterAction.java:

package com.cy.action;

import com.cy.model.User;
import com.opensymphony.xwork2.ActionSupport;

public class RegisterAction extends ActionSupport {

    private static final long serialVersionUID = 1L;
    
    private User user;

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    @Override
    public String execute() throws Exception {
        System.out.println("傳入的用戶" + user);
        return SUCCESS;
    }
    
}

RegisterAction-validation.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.2//EN" "http://struts.apache.org/dtds/xwork-validator-1.0.2.dtd">
<validators>
    <field name="user.userName">
        <field-validator type="requiredstring">
            <message>請輸入用戶名</message>
        </field-validator>
        <field-validator type="stringlength">
            <param name="minLength">6</param>
            <param name="maxLength">10</param>
            <message>用戶名必須在${minLength}和${maxLength}之間</message>
        </field-validator>
    </field>
    
    <field name="user.name">
        <field-validator type="requiredstring">
            <message>請輸入姓名</message>
        </field-validator>
    </field>
    
    <field name="user.age">
        <field-validator type="int">
            <param name="min">18</param>
            <message>年齡必須滿18周歲</message>
        </field-validator>
    </field>
    
    <field name="user.email">
        <field-validator type="requiredstring">
            <message>請輸入郵件</message>
        </field-validator>
        <field-validator type="email">
            <message>郵件格式不對</message>
        </field-validator>
    </field>
    
    <field name="user.homePage">
        <field-validator type="requiredstring">
            <message>請輸入主頁</message>
        </field-validator>
        <field-validator type="url">
            <message>主頁格式不對</message>
        </field-validator>
    </field>
    
    <!-- 
        <![CDATA[xxxx]]>表示忽略裏面的一些特殊的轉義字符
     -->
    <validator type="expression">
        <param name="expression"><![CDATA[!user.name.equals(user.userName)]]></param>
        <message>用戶名和真實姓名不能相同</message>
    </validator>
    
</validators>

struts.xml配置：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
    
    <package name="manage" extends="struts-default">
        <action name="registerAction" class="com.cy.action.RegisterAction">
            <!-- 如果驗證失敗的話，返回到register.jsp註冊頁面 -->
            <result name="input">register.jsp</result>
            <result name="success">success.jsp</result>
        </action>
    </package>
    
</struts>

register.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
　　<!-- 這個作用就是表達式驗證失敗的錯誤信息，顯示在這裏。 -->
    <s:actionerror/> 
    <s:form action="/registerAction" method="post">
        <s:textfield name="user.userName" label="用戶名"></s:textfield>
        <s:textfield name="user.name" label="真實姓名"></s:textfield>
        <s:textfield name="user.age" label="年齡"></s:textfield>
        <s:textfield name="user.email" label="郵件"></s:textfield>
        <s:textfield name="user.homePage" label="主頁"></s:textfield>
        <s:submit value="註冊"></s:submit>
    </s:form>
</body>
</html>

success.jsp:

<body>
註冊成功！
</body>

測試：

註冊填寫失敗，提示信息：

註冊成功，console打印：

struts2學習(11)struts2驗證框架1.驗證簡介、內置驗證