struts2学习（二）

今天学习了struts2的标签的表单验证
第一步：JSP页面
        

 <%@ taglib prefix="s" uri="/struts-tags" %>

	<s:form action="login">
	<s:textfield name="username" label="username"></s:textfield>
	<s:textfield name="password" label="password"></s:textfield>
	<s:submit label="submit"></s:submit>
	</s:form>

第二步：action 

首先action继承ActionSupport

package com.test.action;

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;
	}
	public String execute() throws Exception
	{
		return "success";
		
	}
	@Override
	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");
			
		}
	}
	
}

第三步：struts.xml

<?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>
	</action>
	</package>

</struts>