Struts2 中，相同的验证规则，如何使用同一条异常响应信息，及动态调用各自对应的名称？

本文介绍如何通过修改国际化资源文件和公共验证器实现统一的验证逻辑，并支持多语言切换。通过具体示例展示了如何配置验证器以实现不同字段的类型转换验证和范围验证。

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如果相同的验证规则作为公共验证器使用，仅需修改 短路验证 中的 三个国际化资源文件，及公共验证器，和在页面与作为Model的类中添加相映的字段，number

示例如下：

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三个国际化资源文件

基类：nihao.properties

注意：动态调用fieldName 使用的方法是${getText(fieldName)} ，而后把fieldName 中name 的属性名也配置到国际化资源文件中，这样可以实现多语言的切换

username=UserName
password=Password
password2=Password
submit=Submit
time=Time:{0}
error.int=${getText(fieldName)} needs to be between ${min} and ${max}
age=Age
number=Number

中文：nihao_zh_CN.properties

username=\u7528\u6237\u540D
password=\u8F93\u5165\u5BC6\u7801
password2=\u518D\u6B21\u786E\u8BA4\u5BC6\u7801
submit=\u63D0\u4EA4
time=\u65F6\u95F4:{0}
time2=\u65F6\u95F4:${birth}
error.int=${getText(fieldName)} \u9700\u8981\u5728 ${min} \u548C ${max}\u4E4B\u95F4
age=\u5E74\u9F84
number=\u6570\u5B57

英文：nihao_en_US.properties

username=UserName
password=Password
password2=Password
submit=Submit
time=Time:{0}
time2=Time:${birth}
error.int=${getText(fieldName)} needs to be between ${min} and ${max}
age=Age
number=Number

公共验证器

TestAgeValidation-validation.xml

<!DOCTYPE validators PUBLIC
        "-//Apache Struts//XWork Validator 1.0.2//EN"
        "http://struts.apache.org/dtds/xwork-validator-1.0.2.dtd">

<validators>

     <field name="age">
     	<!-- 类型转换验证 -->
     	<field-validator type="conversion" short-circuit="false" >
	               <message>类型转换错误</message>
	      </field-validator>
     	<!-- 
     		看看添加了短路验证 short-circuit="false" 
     		若类型转换错误的时候，还会不会进行下面的 int整型验证 
     	-->
     
         <field-validator type="int" short-circuit="false">
             <param name="min">1</param>
             <param name="max">130</param>
             <message key="error.int"></message>
         </field-validator>
     </field>
   	
   	<!-- 新增此条验证器 -->
      <field name="number">
     	<!-- 类型转换验证 -->
     	<field-validator type="conversion" short-circuit="false" >
	               <message>类型转换错误</message>
	      </field-validator>
     
         <field-validator type="int" short-circuit="false">
             <param name="min">2</param>
             <param name="max">20</param>
             <message key="error.int"></message>
         </field-validator>
     </field>

      <validator type="expression">
         <param name="expression"><![CDATA[password==password2]]></param>
         <message>密码不一致</message>
      </validator>

</validators>

添加number 字段后的Person 类

package com.baidu.domain;

public class Person {
	private Integer age;
	private String password;
	private String password2;
	private Integer number;


	public Integer getNumber() {
		return number;
	}
	public void setNumber(Integer number) {
		this.number = number;
	}
	public String getPassword2() {
		return password2;
	}
	public void setPassword2(String password2) {
		this.password2 = password2;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	@Override
	public String toString() {
		return "Person [age=" + age + ", password=" + password + ", password2="
				+ password2 + ", number=" + number + "]";
	}

}

页面：

仅以 validation.jsp 页面为例，其他类同！

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
		<br><br>
	<s:debug></s:debug>	
	<a href="testAge3.action?request_locale=zh_CN">中文</a>	
	 
	<a href="testAge3.action?request_locale=en_US">English</a>	
		<br><br>
	<a href="index.jsp">主页</a>	
	
	<center>
		
		<s:actionerror/>
		<s:form action="testAge1"   >
			<s:textfield name="age" key="age"></s:textfield>
			<s:textfield name="number" key="number"></s:textfield>	
			<s:password  name="password" key="password"></s:password>
			<s:password  name="password2" key="password2"></s:password>
			
			<s:submit key="submit"></s:submit>
		</s:form>
	
	</center>
	
</body>
</html>

效果：

英文：