struts2框架数据校验，表单不能显示错误提示。

我在登录界面的username  password 不输入任何值，为什么不会显示出错误提示呢

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>

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

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>







  

    ">

    

    

    

	

	

	    

	

	

	



  

  

  

    

    

        

        

        

    

  

package com.test.action;



import com.opensymphony.xwork2.ActionSupport;



@SuppressWarnings("serial")

public class LoginAction extends ActionSupport{

	String username;

	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(){

		return "success";

	}

	

	@Override

	public void validate() {

		if(null == this.getUsername()||"".equals(this.getUsername().trim())){

			this.addFieldError("username", "username required");

		}

		if(null == this.getUsername()||"".equals(this.getPassword().trim())){

			this.addFieldError("password", "password required");

		}

	}

}

        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"

        "http://struts.apache.org/dtds/struts-2.0.dtd">





    

        

            /login2.jsp

            /result.jsp

        

    

21 个解决方案