struts2学习之二------基本验证
struts2学习之二----基本验证1、使用标签将原来“struts2学习之一”中的lonin.jsp替换为login2.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%><%@ 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=ISO-8859-1"><title>Insert title here</title></head><body><s:form action="login"><s:textfield name="username" label="username"></s:textfield><s:password name="password" label="password"></s:password><s:submit label="submit"></s:submit></s:form></body></html>
2、修改原“struts2学习之一”中loginAction，使它继承自ActionSupport
这样一来可以使用ActionSupport类的许多方法，如valildate（）验证方法等
package com.test.action;import java.util.Map;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;public class LoginAction extends ActionSupport{ private String username; private String password; 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; } @SuppressWarnings("unchecked") //带逻辑的验证还是放在excute()方法里 public String execute() throws Exception {if ("hello".equals(this.getUsername().trim()) && "world".equals(this.getPassword().trim())){ Map map = ActionContext.getContext().getSession(); map.put("user","valid"); return "success";}else{//struts2框架会自动显示FieldError的内容，此处如果出错就会显示在字段username上出错信息username or password error this.addFieldError("username", "username or password error"); return "failer";} } @Override //validate方法用来验证是否为空或是长度等简单的验证 public void validate() {if (null == this.getUsername() || "".equals(this.getUsername().trim())){ this.addFieldError("username", "username required");}if (null == this.getPassword() || "".equals(this.getPassword().trim())){ this.addFieldError("password", "password required");} }}
3、strurt.xml修改为
<?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="struts2" extends="struts-default"> <action name="login" class="com.test.action.LoginAction"> <result name="input">/login2.jsp</result> <result name="success">result.jsp</result> <result name="failer">/login2.jsp</result> </action> </package> </struts>
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