Struts2_基于XML配置方式对指定action方法实现输入校验、基于XML校验的一些特点

淡淡的烟草味﹌ 2022-06-15 00:52 119阅读 0赞

基于XML配置方式对指定action方法实现输入校验:

当校验文件的取名为ActionClassName-validation.xml时,会对action中的所有处理方法实现输入验证。
    	如果你只需要对action中的某个action方法实现校验,那么,校验文件的取名应为:ActionClassName-ActionName-validation.xml,
    	其中ActionName为struts.xml中action的名称。例如:在实际应用中,常有以下配置:
    	<package name="itcast" namespace="/person" extends="struts-default">
    		<action name="list_*" class="cn.itcast.a_action.PersonAction" method="{1}">
    			<result name="input">/index.jsp</result>
    			<result name="message">/WEB-INF/page/message.jsp</result>
    		</action>
    	</package>
    	PersonAction中有以下两个处理方法:
    	public String update(){
    		...
    	}
    	public String save(){
    		...
    	}
    	要对update()方法实施验证,校验文件的取名为:PersonAction-list_update-validation.xml
    	要对save()方法实现验证书,校验文件的取名为:PersonAction-list_save-validation.xml

基于XML校验的一些特点：

当为某个action提供了ActionClassName-validation.xml和ActionClassName-ActionName-validation.xml
    	两种规则的校验文件时,系统按下面顺序寻找校验文件:
    	1,ActionClassName-validation.xml
    	2,ActionClassName-ActionName-validation.xml
    	系统寻找到第一个校验文件时还会继续搜索后面的校验文件,当搜索到所有校验文件时,会所校验文件
    	里的所有校验规则汇总,然后全部应用于action方法的校验。如果两个校验文件中指定的校验南侧则冲突,
    	则只使用后面文件中的校验规则。
    	
    	当action继承了另一个action,父类action的校验文件会先被搜过到。
    	
    	假设UserAction继承BaseAction:
    	<action name="user" class="cn.itcast.action.UserAction" menthod="{1}">
    	</action>
    	
    	访问上面action,系统先搜父类的校验文件:BaseAction-validation.xml,BaseAction-user-validation.xml,
    	接着搜索子类的校验文件:UserAction-validation.xml,UserAction-user-validation.xml。
    	应用于上面action的校验规则为这四个文件的总和。

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE struts PUBLIC
    	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    	"http://struts.apache.org/dtds/struts-2.3.dtd">
    
    <struts>
    	
    	<constant name="struts.i18n.encoding" value="UTF-8" />
    	
    	<constant name="struts.action.extension" value="com,action" />
    	
    	<constant name="struts.configuration.xml.reload" value="true" />
    	
    	
    	<include file="struts_validata.xml"/>
    </struts>

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE struts PUBLIC
    	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    	"http://struts.apache.org/dtds/struts-2.3.dtd">
    
    <struts>
    	<package name="itcast" namespace="/person" extends="struts-default">
    		<action name="list_*" class="cn.itcast.a_action.PersonAction" method="{1}">
    			<result name="input">/index.jsp</result>
    			<result name="message">/WEB-INF/page/message.jsp</result>
    		</action>
    	</package>
    </struts>

<!DOCTYPE validators PUBLIC
            "-//Apache Struts//XWork Validator 1.0.3//EN"
            "http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd">
    
    <validators>
    	<field name="username">
    		<field-validator type="requiredstring">
    			<param name="trim">true</param>
    			<message>用户名不能为空!</message>
    		</field-validator>
    	</field>
    	<field name="mobile">
    		<field-validator type="requiredstring">
    			<param name="trim">true</param>
    			<message>手机号不能为空!</message>
    		</field-validator>
    		<field-validator type="regex">
    			<param name="regexExpression"><![CDATA[^1[358]\d{9}$]]></param>
    			<message>手机号格式不正确</message>
    		</field-validator>
    	</field>
    </validators>

package cn.itcast.a_action;
    
    import java.util.regex.Pattern;
    
    import com.opensymphony.xwork2.ActionContext;
    import com.opensymphony.xwork2.ActionSupport;
    
    public class PersonAction extends ActionSupport {
    	private String username;
    	private String mobile;
    
    	public String getUsername() {
    		return username;
    	}
    
    	public void setUsername(String username) {
    		this.username = username;
    	}
    
    	public String getMobile() {
    		return mobile;
    	}
    
    	public void setMobile(String mobile) {
    		this.mobile = mobile;
    	}
    
    	public String update() {
    		ActionContext.getContext().put("message", "更新成功");
    		return "message";
    	}
    
    	public String save() {
    		ActionContext.getContext().put("message", "保存成功");
    		return "message";
    	}
    
    }

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
    <%@ taglib uri="/struts-tags" prefix="s"%>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <head>
    <title>输入校验</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    </head>
    
    <body>
    	<s:fielderror />
    	<form action="<%=request.getContextPath()%>/person/list_update.action"
    		method="post">
    		用户名:<input type="text" name="username">不能为空<br /> 手机号:<input
    			type="text" name="mobile" />不能为空,并且要符合手机号的格式1,3/5/8,后面是9个数字<br /> <input
    			type="submit" value=" 提 交 " />
    	</form>
    </body>
    </html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
    
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <head>
    
    <title>结果</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    </head>
    
    <body>
    	${message }
    </body>
    </html>