Struts2_对Action中所有方法进行输入校验

野性酷女 2022-06-14 23:22 114阅读 0赞

手工编写代码实现对acgion中所有方法输入校验:

通过重写validate()方法实现,validate()方法会校验action中所有与execute()方法签名相同的方法。当某个数据
    校验失败时,我们应该调用addFieldError()方法往系统的fieldErrors添加校验失败信息(为了使用addFieldError()方法,action
    可以继承ActionSupport),如果系统的fieldError包含失败信息,struts2会将请求转发到名为input的result。在input视图中可以
    通过<s:fielderror/>显示失败信息。
    validate()使用例子:
    	@Override
    	public void validate() {// 会对action中的所有方法进行校验
    		if (this.username == null || "".equals(this.username.trim())) {
    			this.addFieldError("username", "用户名不能为空");
    		}
    		if (this.mobile == null || "".equals(this.mobile.trim())) {
    			this.addFieldError("mobile", "手机号不能为空");
    		} else {
    			// 格式1,3/5/8,后面是9个数字
    			if (!Pattern.compile("^1[358]\\d{9}$").matcher(this.mobile).matches()) {
    				this.addFieldError("mobile", "手机号格式不正确");
    			}
    		}
    	}
    
    验证失败后,请求转发至input视图:
    <result name="input">/index.jsp</result>
    
    在index.jsp页面中使用<s:fielderror/>显示失败信息。

<?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>

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";
    	}
    
    	@Override
    	public void validate() {// 会对action中的所有方法进行校验
    		if (this.username == null || "".equals(this.username.trim())) {
    			this.addFieldError("username", "用户名不能为空");
    		}
    		if (this.mobile == null || "".equals(this.mobile.trim())) {
    			this.addFieldError("mobile", "手机号不能为空");
    		} else {
    			// 格式1,3/5/8,后面是9个数字
    			if (!Pattern.compile("^1[358]\\d{9}$").matcher(this.mobile).matches()) {
    				this.addFieldError("mobile", "手机号格式不正确");
    			}
    		}
    	}
    }

<%@ 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>