struts2的数据验证之编码方式验证和validation.xml验证

来源：互联网发布：js模块化什么意思编辑：程序博客网时间：2024/05/17 23:50

1.编码方式验证

在Action的execute方式执行前会先执行validate方法，如果在validate方法里addFieldError或者addActionError，那么Action将不会执行execu方法，并且会直接跳转到一个名为“input”的result视图。推荐对每个需要数据验证的方法创建validate加上自定义方法的名称的一个验证方式，如自定义方法login，则创建validateLogin验证方法。

Action

package com.zucc.action;import com.opensymphony.xwork2.ActionSupport;import com.opensymphony.xwork2.ModelDriven;import com.zucc.model.User;public class UserAction extends ActionSupport implements ModelDriven<User>{private User user;@Overridepublic String execute() throws Exception {System.out.println("UserAction execute.....");System.out.println("username:"+user.getUsername());System.out.println("password:"+user.getPassword());System.out.println("rePassword:"+user.getRePassword());System.out.println("age:"+user.getAge());System.out.println("do register....");return SUCCESS;}@Overridepublic User getModel() {this.user = new User();return this.user;}@Overridepublic void validate() {System.out.println("UserAction validate....");if(user.getUsername()==null||user.getUsername().trim().equals("")){this.addFieldError("username", "用户账号不能为空");}if(user.getPassword()==null||user.getPassword().trim().equals("")){this.addFieldError("password", "密码不能为空");}if(user.getRePassword()==null||user.getRePassword().trim().equals("")){this.addFieldError("rePassword", "确认密码不能为空");}if(!(user.getPassword().equals(user.getRePassword()))){this.addFieldError("rePassword", "两次输入密码不一致");}if(user.getAge()<=0||user.getAge()>150){this.addFieldError("age", "年龄不合法");}}}

验证不通过跳转到一个名为“input”的result视图，在struts.xml中配置

struts.xml

<struts><constant name="struts.enable.DynamicMethodInvocation" value="true" />    <constant name="struts.devMode" value="true" />     <package name="default" namespace="/" extends="struts-default"> <action name="user_register" class="com.zucc.action.UserAction" method="register"> <result>/Hello.jsp</result> <result name="input">/register.jsp</result> </action>    </package></struts>

在表单上显示addFieldError中的信息有三种方式，一种是使用EL,一种是使用struts-tags标签，一种是完全使用struts-tags标签

使用EL

<body><h1>用户注册</h1><div>${fieldErrors['password'][0]}</div><div>${fieldErrors['rePassword'][0]}</div><div>${fieldErrors['age'][0]}</div></span><form action="user_register" method="post">帐号:<input type="text" name="username"><br/> 密码:<input type="password" name="password"><br/>确认密码:<input type="password" name="rePassword"><br/>年龄:<input type="text" name="age"><br/><input type="submit" value="提交"></form><hr/></body>

使用struts-tags标签

<%@ taglib prefix="s" uri="/struts-tags" %><body><h1>用户注册</h1><div><s:fielderror></s:fielderror></div><form action="user_register" method="post">帐号:<input type="text" name="username"><br/> 密码:<input type="password" name="password"><br/>确认密码:<input type="password" name="rePassword"><br/>年龄:<input type="text" name="age"><br/><input type="submit" value="提交"></form></body>

完全使用struts-tags标签

<%@ taglib prefix="s" uri="/struts-tags" %><body><h1>用户注册</h1><s:form action="user_register" method="post"><s:textfield name="username" label="帐号"/><s:password name="password" label="密码"/><s:password name="rePassword" label="确认密码"/><s:textfield name="age" label="年龄"/><s:submit value="提交"/></s:form></body>

2.使用validation.xml验证
使用XML对Action方法进行校验方式有两种：

一种是对Action的所有方法进行校验，validation.xml的名字是ActionClassName-validation.xml，其ActionClassName为action的类名，-valication为固定写法，如UserAction-validation.xml；

另一种是对Action指定方法进行校验，validation.xml的名字是ActionClassName-AccessActionName-validation.xml，其中ActionClassName为action的类名，AccessActionName为指定Action的方法在struts.xml的 action name，-valication为固定写法，如UserAction-user_register-validation.xml

Action-UserAction

package com.zucc.action;import com.opensymphony.xwork2.ActionSupport;import com.opensymphony.xwork2.ModelDriven;import com.zucc.model.User;public class UserAction extends ActionSupport implements ModelDriven<User>{private User user;@Overridepublic String execute() throws Exception {System.out.println("UserAction execute.....");System.out.println("username:"+user.getUsername());System.out.println("password:"+user.getPassword());System.out.println("rePassword:"+user.getRePassword());System.out.println("age:"+user.getAge());System.out.println("do register....");return SUCCESS;}@Overridepublic User getModel() {this.user = new User();return this.user;}public String register() throws Exception{System.out.println("UserAction register....");return SUCCESS;}}

如果validation.xml的名字是UserAction-validation.xml，那就是对UserAction中的所有方法进行验证；如果validation.xml的名字是UserAction-user_register-validation.xml，那就只是对UserAction中的register方法进行验证。

user_register是因为struts.xml的action name是user_register，如下面的struts.xml

struts.xml

<struts><constant name="struts.enable.DynamicMethodInvocation" value="true" />    <constant name="struts.devMode" value="true" />     <package name="default" namespace="/" extends="struts-default"> <action name="user_register" class="com.zucc.action.UserAction" method="register"> <result>/Hello.jsp</result> </action>    </package></struts>

validation.xml中的写法有两种方式，一种是属性field，另一种是使用验证器validator

属性field

<?xml version="1.0" encoding="UTF-8"?> <!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="required"><message>用户名不能为空</message></field-validator><field-validator type="requiredstring"><message>用户名不能为空</message></field-validator></field><field name="age"><field-validator type="int"><param name="max">150</param><param name="min">1</param><message>年龄必须介于1-150</message></field-validator></field><field name="password"><field-validator type="requiredstring"><message>密码不能为空</message></field-validator></field><field name="rePassword"><field-validator type="requiredstring"><message>确认密码不能为空</message></field-validator></field><field name="rePassword"><field-validator type="fieldexpression"><param name="expression">password.equals(rePassword)</param><message>密码必须一致</message></field-validator></field></validators>

验证器validator

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE validators PUBLIC  "-//Apache Struts//XWork Validator 1.0.3//EN"  "http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd">  <validators><validator type="requiredstring"><param name="fieldName">username</param><message>用户名不能为空</message></validator><validator type="requiredstring"><param name="fieldName">password</param><message>密码不能为空</message></validator><validator type="requiredstring"><param name="fieldName">rePassword</param><message>确认密码不能为空</message></validator><validator type="fieldexpression"><param name="expression">password.equals(rePassword)</param><param name="fieldName">rePassword</param><message>密码必须一致</message></validator><validator type="int"><param name="fieldName">age</param><param name="max">150</param><param name="min">1</param><message>年龄必须介于1-150</message></validator></validators>

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