validate（）方法验证
一个ACTION类继承ActionSupport有何用处？
答：在ActionSupport中实现了很多接口，就拿一个来讲，validate()方法，是默认的验证。我们可以在我们的action类中重写一下此方法。比方说验证用户名是否为空。这个方法不需要调用，当S：FORM表单提交了，到了action类中会首先执行此方法。对数据进行验证。
用 el 表达式 或 struts 标签 读取错误信息
1 <%@ page language="java" contentType="text/html; charset=ISO-8859-1" 2 pageEncoding="ISO-8859-1"%> 3 <%@ taglib uri="/struts-tags" prefix="s"%> 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 5
validate()方法校验1 package com.helen.action; 2 3 import com.opensymphony.xwork2.ActionSupport; 4 5 public class LoginAction extends ActionSupport { 6 private String username; 7 private String password; 8 9 public void validate() {10 11 if (username == null || username.equals("")) {12 this.addFieldError("username", "please enter your username!");13 } else if (!username.equals("admin")) {14 this.addFieldError("username", "username is not right!");15 }16 if (password == null || password.equals("")) {17 18 this.addFieldError("password", "please enter your password!");19 } else if (!password.equals("123")) {20 this.addFieldError("password", "password is not right!");21 }22 23 }24 25 public String getUsername() {26 return username;27 }28 29 public void setUsername(String username) {30 this.username = username;31 }32 33 public String getPassword() {34 return password;35 }36 37 public void setPassword(String password) {38 this.password = password;39 }40 41 }返回值为 input
<action name="login" class="com.helen.action.LoginAction"> <result name="input">/index.jsp</result> <result>/success.jsp</result>
</action>
Struts2 Simple login Validate
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
