【Struts2十】校验表达二:使用xml配置validator来校验表单

手动校验还是不大优雅，Struts2还提供了另外一种xml配置的方式校验表单！

在Action的同目录下添加一个xml文件，文件名严格限制为：Action类名-Action别名_方法名-validation.xml：

如：ValidateXMLAction-validateXMLAction_aaa-validation.xml

1.ValidateXMLAction:

public classValidateXMLActionextendsActionSupport{

private Stringusername;

private Stringpassword;

private Integerage;

public Integer getAge() {

returnage;

}

public voidsetAge(Integer age) {

this.age= age;

}

public String getUsername() {

returnusername;

}

public voidsetUsername(String username) {

this.username= username;

}

public String getpassword() {

returnpassword;

}

public voidsetPassword(String password) {

this.password= password;

}

public String testValidate(){

return"success";

}

public String aaa(){

return"success";

}

2.需要校验的表单jsp：

validate_xml.jsp:

<%@ pagelanguage="java"import="java.util.*"pageEncoding="UTF-8"%>

<%@ tagliburi="/struts-tags"prefix="s"%>

<! DOCTYPE HTMLPUBLIC"-//W3C//DTD HTML 4.01 Transitional//EN">

< html >

<head>

</head>

<body>

< s:fielderror ></s:fielderror>

< form action="validate/validateXMLAction_aaa.action"method="post">

用户名: <inputtype="text"name="username"><br>

密码: <inputtype="text"name="password"><br>

年龄: <inputtype="text"name="age"><br>

<inputtype="submit">

</ form >

</body>

</ html >

3.配置validator的xml文件

ValidateXMLAction-validateXMLAction_aaa-validation.xml：

<? xml version="1.0"encoding="UTF-8"?>

<! DOCTYPE validatorsPUBLIC

"-//Apache Struts//XWork Validator 1.0.3//EN"

"http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd">

< validators >

<!--

指明action中要校验的属性

-->

< field name="username">

<!--

field-validator指定校验器

type为校验规则

-->

<field-validatortype="requiredstring">

<paramname="trim">true</param>

</field-validator>

</ field >

< field name="password">

<field-validatortype="requiredstring">

<paramname="trim">true</param>

</field-validator>

<field-validatortype="regex">

<paramname="trim">true</param>

<paramname="expression"><![CDATA[^[a-zA-Z0-9]{6,12}$]]></param>

</field-validator>

</ field >

< field name="age">

<!--

<field-validatortype="int">

</field-validator>

-->

<field-validatortype="age">

</field-validator>

</ field >

</ validators >

4.上述xml文档中用到了自定义校验age的校验器，需要实现以下步骤才能正常使用：

（1）.src根目录下新建一个validators.xml的文件：

<? xml version="1.0"encoding="UTF-8"?>

<! DOCTYPE validatorsPUBLIC

"-//Apache Struts//XWork Validator Config 1.0//EN"

"http://struts.apache.org/dtds/xwork-validator-config-1.0.dtd">

< validators >

<validatorname="age"class="cn.itcast.struts2.action.validate.AgeValidate"></validator>

</ validators >

（2）.写一个AgeValidate的类:

package cn.itcast.struts2.action.validate;

import com.opensymphony.xwork2.validator.ValidationException;

import com.opensymphony.xwork2.validator.validators.FieldValidatorSupport;

public classAgeValidateextendsFieldValidatorSupport{

public voidvalidate(Object object)throwsValidationException {

System. out.println("错误信息:"+this.getMessage(object));

String fieldName = this.getFieldName();

System. out.println("字段名称:"+fieldName);

Object o = this.getFieldValue(fieldName,object);

if(oinstanceofjava.lang.Integer){

Integer len = (Integer)o;

if(len<1){

this.addFieldError(fieldName,object);

}

5.struts-validate.xml

<? xml version="1.0"encoding="UTF-8"?>

<! DOCTYPE strutsPUBLIC

"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"

"http://struts.apache.org/dtds/struts-2.3.dtd">

< struts >

< package name="validate"namespace="/validate"extends="struts-default">

<actionname="validateXMLAction_*"method="{1}"class="cn.itcast.struts2.action.validate.ValidateXMLAction">

<resultname="input">/validate/validate_xml.jsp</result>

<resultname="success">/validate/success.jsp</result>

</action>

</ package >

</ struts >

【Struts2十】校验表达二:使用xml配置validator来校验表单

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