Struts的Validator验证框架使用教程

一、验证有很多种：

1.最开始接触的js验证客户端验证

2.服务器端验证

     2.1.在FormBean中验证（本例中采用的便是FormBean中使用Validator验证格式）

     2.2.Action业务逻辑层验证（比如用户名在数据库中是否存在等等）

3.采用Ajax在异步的情况下进行客户端和服务器同时的验证



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二、步骤：

1.建立web项目struts_validator添加struts（1.2）支持

2.右击项目-->new-->other-->myeclipse-->web-struts-->struts1.2-->Strurs1.2 Form ,Action & JSP；supclass:ValidatorForm；再添加一些属性，跳转些...

3.打开validator-rules.xml将一下代码添加到struts-config.xml中

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

4.打开validator-rules.xml将一下代码添加到ApplicationResources.properties中，当然你可以根据需要修改资源文件

   # Struts Validator Error Messages
   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.

5.编写public class RegistForm extends ValidatorForm的validate方法

	public ActionErrors validate(ActionMapping mapping,
			HttpServletRequest request) {
		//必须要继承自父类的
		ActionErrors errors = super.validate(mapping, request);

		// Only need crossfield validations here
		if (!password.equals(password2)) {
			errors.add("password2", new ActionMessage("error.password.match"));
		}
		return errors;
	}

6.在WEB-INF目录下编写validation.xml文件

<!DOCTYPE form-validation PUBLIC
          "-//Apache Software Foundation//DTD Commons Validator Rules Configuration 1.1.3//EN"
          "http://jakarta.apache.org/commons/dtds/validator_1_1_3.dtd">
<form-validation>
	<formset>
		<!--
			如果FormBean继承的是ValidatorForm那么<form name="registForm">的name
			属性值和<action/>中name的属性值是一样的 如果FormBean继承的是ValidatorActionForm那么<form
			name="registForm">的name 属性值和<action/>中path的属性值是一样的
		-->
		<form name="registForm">
			<field property="username" depends="required,minlength">
				<!--
					如果arg不指定name，那么depends的将共享 resource="false"那么在<html:errors
					property="username" /> 中显示的将是我们key定义的数据
					resource="true"(默认的)那么将使用资源文件中的key-value配置
					具体的属性信息可以参看http://jakarta.apache.org/commons/dtds/validator_1_1_3.dtd
				-->
				<arg0 key="username" resource="false" />
				<arg1 name="minlength" key="${var:minlength}" resource="false" />
				<var>
					<var-name>minlength</var-name>
					<var-value>6</var-value>
				</var>
			</field>
			<field property="password" depends="required,minlength">
				<arg0 key="password" resource="false" />
				<arg1 name="minlength" key="${var:minlength}" resource="false" />
				<var>
					<var-name>minlength</var-name>
					<var-value>6</var-value>
				</var>
			</field>
			<field property="password2" depends="required"></field>
			<field property="email" depends="email">
				<arg0 key="customer.email" resource="false" />
				<arg1 name="email" key="[e-mail]" resource="false" />
			</field>
		</form>
	</formset>
</form-validation>

7.部署运行：http://localhost:8080/struts_validator_3/regist.jsp

8.查看附件


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