struts表单验证

Struts表单验证有两种方式

1.通过继承ActionSupport，重载validate方法

2.利用struts的validate框架来验证：配置ActionName-validation.xml

方式一： 1. 前台jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<head>
		<title>Login blog</title>
	</head>

	<body bgcolor="#bbbbbb">
		<div align="center">
                         <s:form action="login.action" method="post" theme="simple">
                         Msg:<s:actionmessage/><br/>
                         ActionError: <s:actionerror/><br/>   
                         nameError:  <s:fielderror><s:param>tuser</s:param></s:fielderror><br/>
                         Username:<s:textfield name="tusername"></s:textfield><br/>
                         passError:  <s:fielderror><s:param>tpsw</s:param></s:fielderror><br/>
                         Password:<s:textfield name="tpassword"></s:textfield>
                         <s:submit></s:submit>
                         </s:form>
                </div>
	</body>
</html>

<s:actionmessage/>提示action运行状态

<s:actionerror/>提示action执行错误

<s:fielderror>提示验证错误

2.action类

主要接受前台传参tusername和tpassword

public class LoginAction extends ActionSupport{
	private String tusername;
	private String tpassword;
	/*****************************************
 * 后台给前台传值
 * 1.通过Action的属性，Get方法传值
 * 2.通过ActionContext---->session
 * 3.通过ServletActionContext----->request  response 
 * 
 * servlet是单例的，action不是。
 * servlet效率更高
 * Action如果是单例，属性不安全 ，所以Struts是线程安全的， 每次请求都会创建一个action来为线程服务
 ****************************************/

	
	public String getTpassword() {
		return tpassword;
	}
	public String getTusername() {
		return tusername;
	}
	public void setTpassword(String tpassword) {
		this.tpassword = tpassword;
	}
	public void setTusername(String tusername) {
		this.tusername = tusername;
	}
	/**
	 * default function
	 */
	public String execute(){
		return "success";
	}
	@Override
	public void validate() { 
                //如果有错，默认会产生一个input的result，所以必须在xml中配置一个result为input
                if(tusername==null && tusername.equals("")){
			addFieldError("tuser", "cannot be null");
			addActionError("user is null");
			addActionMessage("error1");
		}
		if(tpassword==null || tpassword.equals("")){
			addFieldError("tpsw", "password cannot be null");
			addActionError("password is null");
			addActionMessage("error2");
		}
	}
	
}

3.配置Struts.xml

<struts>
	<include file="struts-default.xml"></include>
	<package name="system" extends="struts-default" namespace="/">
		<action name="login" class="com.scu.blog.action.LoginAction">
			<result name="success">/home.jsp</result>
			<result name="input">/index.jsp</result>
		</action>		
	</package>
</struts>

结果如下：
Msg:
error1
error2

ActionError:
user is null
password is null

nameError:
cannot be null

passError:
password cannot be null

方法二：使用struts validate框架

1.前台

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<head>
		<title>Login blog</title>
	</head>

	<body bgcolor="#bbbbbb">
		<div align="center">
                         <s:form action="login" namespace="/">
                         <s:textfield label="Username" name="tusername"></s:textfield><br/>
                         <s:textfield label="Password" name="tpassword"></s:textfield>
                         <s:submit></s:submit>
                         </s:form>
                </div>
	</body>
</html>

2.配置validation.xml

要验证的.class文件在同一目录下，而且配置文件名要使用如下两个规则中的一个来命名：

<ActionClassName>-validation.xml

<ActionClassName>-<ActionAliasName>-validation.xml

其中<ActionAliasName>就是struts.xml中<ation>的name属性值
本例使用的是LoginAction所以配置文件为LoginAction-validation.xml 并且放置于同一个目录下面

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC "-//OpenSymphony Group//XWork Validator 1.0.2//EN" "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">
<validators>
    <field name="tusername">
        <field-validator type="requiredstring">
            <message>请输入姓名</message>
        </field-validator>
    </field>
    <field name="tpassword">
        <field-validator type="requiredstring">
                <message>请输入密码</message>
        </field-validator>
    </field>
</validators>

更多配置标签可以去查手册http://struts.apache.org/2.0.11.1/docs/validation.html

3.后台代码

public class LoginAction extends ActionSupport{
	
	private String tusername;
	private String tpassword;

	public String getTpassword() {
		return tpassword;
	}
	public String getTusername() {
		return tusername;
	}
	public void setTpassword(String tpassword) {
		this.tpassword = tpassword;
	}
	public void setTusername(String tusername) {
		this.tusername = tusername;
	}
	/**
	 * default function
	 */
	public String execute(){
		return "success";
	}
}

结果为

请输入姓名
Username:
请输入密码
Password:

posted on 2012-09-08 02:27 mathore 阅读(517) 评论(0) 编辑收藏举报