struts1中使用Validator插件对表单进行校验

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首先搭建好struts1的开发环境，然后在struts1的配置文件struts-config中加入

<plug-in className="org.apache.struts.validator.ValidatorPlugIn">        <set-property property="pathnames"                       value="/org/apache/struts/validator/validator-rules.xml,                             /WEB-INF/validation.xml"/></plug-in>

这样就把Validator插件引入到struts1中了,然后新建一个UserFormBean继承ValidateActionForm类

package cn.lfd.web.formbean;import org.apache.struts.chain.commands.servlet.ValidateActionForm;public class UserFormBean extends ValidateActionForm {private String username;private String password;private String email;private String birthday;public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}public String getBirthday() {return birthday;}public void setBirthday(String birthday) {this.birthday = birthday;}}

然后在WEB-INF目录下新建一个validation.xml文件

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE form-validation PUBLIC         "-//Apache Software Foundation//DTD Commons Validator Rules Configuration 1.3.0//EN"         "http://jakarta.apache.org/commons/dtds/validator_1_3_0.dtd"><form-validation><formset><form name="UserFormBean"><field property="username" depends="required,minlength,maxlength"><arg key="用户名"  position="0" resource="false"/><arg name="minlength" key="${var:minlength}" position="1" resource="false"/><arg name="maxlength" key="${var:maxlength}" position="1" resource="false"/><var><var-name>minlength</var-name><var-value>3</var-value></var><var><var-name>maxlength</var-name><var-value>8</var-value></var></field><field property="email" depends="email"><arg key="邮箱" position="0" resource="false"/></field></form></formset></form-validation>

校验器从validator-rules.xml文件中可以获取，最后新建一个MessageResource.properties的资源文件，在struts-config文件中配置一下，struts1就会根据这个文件进行错误显示

<message-resources parameter="MessageResource"></message-resources>

MessageResource.properties文件：

errors.required={0} is required.errors.minlength={0} can not be less than {1} characters.errors.maxlength={0} can not be greater than {1} characters.errors.invalid={0} is invalid.errors.byte={0} must be a byte.errors.short={0} must be a short.errors.integer={0} must be an integer.errors.long={0} must be a long.errors.float={0} must be a float.errors.double={0} must be a double.errors.date={0} is not a date.errors.range={0} is not in the range {1} through {2}.errors.creditcard={0} is an invalid credit card number.errors.email={0} is an invalid e-mail address.

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