欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

struts2学习笔记二(第2讲.Struts2入门与配置续)

程序员文章站 2022-05-28 15:53:23
...
接上面未完成的功能:判断输入的用户名和密码是否正确。
一、创建一个新的登录页面:login2.jsp(struts2的标签库的描述符放在struts2-core-2.0.14.jar下的META-INF/struts-tags.tld中)

<%@ page language="java" contentType="text/html" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'login2.jsp' starting page</title>
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</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="sumbit"></s:submit>

</s:form>
</body>
</html>


二、编辑LoginAction.java类,使其继承自ActionSupport类,并且继承一个validate方法,用于验证用户名和密码输入是否为空或者是否正确,LoginAction.java类代码最终如下:

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
{
if("hello".equals(this.getUsername().trim()) && "world".equals(this.getPassword().trim()))
{
return "success";
}
else
{
this.addFieldError("username", "username or password error");
return "failer";
}
}

@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");
}
}
}


三、编辑配置struts.xml,对于出现不同错误指向不同的位置:

<?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="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>

<action name="pointConverter" class="com.test.action.PointAction">
<result name="success">/output.jsp</result>
</action>

</package>

</struts>


图片演示操作的效果:
都为空时:
[img]http://dl.iteye.com/upload/attachment/382617/c343f2bb-d33e-3497-9291-e35a2a150a9e.jpg[/img]
用户名为空时:
[img]http://dl.iteye.com/upload/attachment/382619/2a5e84d4-b35c-33fb-bc30-08b82f106075.jpg[/img]
密码为空时:
[img]http://dl.iteye.com/upload/attachment/382621/86973a77-a687-3348-ac48-1845937e800e.jpg[/img]
都正确时:
[img]http://dl.iteye.com/upload/attachment/382623/8ec2b7bc-417d-355e-8c7b-135e2f02a8a4.jpg[/img]