struts2学习笔记八（第8讲.Struts2的校验框架）

[b][size=xx-large]第8讲.Struts2的校验框架[/size][/b]

之前的验证方式是struts2提供的硬编码的方式的验证，struts2还提供了一个优秀的校验框架，是基于xml文件配置的，我们可以通过这个xml配置文件，而不用再写任何的代码就能完成表单的输入校验。
一、如果要验证哪个action就要在那个action的同一目录下创建验证框架的xml的文件，还是基于上节课的register2.jsp的表单验证，所以在com.test.action包下创建RegisterAction-validation.xml文件（后面的-validation.xml是不变的，前面的是对应的要验证的action的名称）：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC "-//OpenSymphony Group//XWork Validator 1.0.2//EN" "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">

<validators >

	<field name="username">
		<field-validator type="requiredstring">
			<param name="trim">true</param>
			<message>username should not be blank!</message>
		</field-validator>
		<field-validator type="stringlength">
			<param name="minLength">6</param>
			<param name="maxLength">10</param>
			<message>username should be between ${minLength} and ${maxLength}</message>
		</field-validator>
	</field>

	<field name="password">
		<field-validator type="requiredstring">
			<message>password should not be blank!</message>
		</field-validator>
		<field-validator type="stringlength">
			<param name="minLength">6</param>
			<param name="maxLength">10</param>
			<message>password should be between ${minLength} and ${maxLength}</message>
		</field-validator>
	</field>

	<field name="repassword">
		<field-validator type="requiredstring">
			<message>repassword should not be blank!</message>
		</field-validator>
		<field-validator type="stringlength">
			<param name="minLength">6</param>
			<param name="maxLength">10</param>
			<message>repassword should be between ${minLength} and ${maxLength}</message>
		</field-validator>
	</field>

	<field name="age">
		<field-validator type="int">
			<param name="min">1</param>
			<param name="max">150</param>
			<message>age should be between ${min} and ${max}</message>
		</field-validator>
	</field>

	<field name="birthday">
		<field-validator type="required">
			<message>birthday should not be blank!</message>
		</field-validator>
		<field-validator type="date">
			<param name="min">2001-01-01</param>
			<param name="max">2003-12-31</param>
			<message>birthday should be between ${min} and ${max}</message>
		</field-validator>
	</field>

	<field name="graduation">
		<field-validator type="required">
			<message>graduation should be not blank!</message>
		</field-validator>
		<field-validator type="date">
			<param name="min">2005-01-01</param>
			<param name="max">2007-12-31</param>
			<message>graduation should be between ${min} and ${max}</message>
		</field-validator>
	</field>

</validators>

三、同时注释掉action类中的对应的自定义的验证方法，注释后代码如下：

...
@Override
	public String execute() throws Exception {

		return SUCCESS;
	}
//	public String abc() throws Exception {
//		
//		System.out.println("abc() method invoked");
//		return SUCCESS;
//	}
//	
//	public void validateAbc(){
//		
//		System.out.println("validateAbc() invoked");
//	}

	@Override
	public void validate() {

		System.out.println("validate~~~~~~~~~~~~~~");
		if(null == username || username.length() < 6 || username.length() > 10){
			this.addActionError("username invalid");
		}
		if(null == password || password.length() <6 || password.length() > 10){
			this.addActionError("password invalid");
		}
		else if(null == repassword || repassword.length() < 6 || repassword.length() > 10){
			this.addActionError("repassword invalid");
		}
		else if(!password.equals(repassword)){
			this.addFieldError("password", "two passwords not the same");
		}
		if(age <= 0 || age > 150){
			this.addActionError("age should be between 1 and 150");
		}

		if(null != birthday && null != graduation){
			Calendar c1 = Calendar.getInstance();
			c1.setTime(birthday);

			Calendar c2 = Calendar.getInstance();
			c2.setTime(graduation);

			if(!c1.before(c2)){
				this.addActionError("birthday should be before graduation");
			}
		}
	}
...

四、重新修改Register2.jsp页面中的显示错误信息的级别，因为之前的是actionerror级别的，要修改为fielderror级别的：

<table align="center" width="40%">
		<tr>
			<td>
				<s:fielderror cssStyle="color:red"/>
			</td>
		</tr>
	</table>

说明：如果校验信息不是很复杂的情况下尽量的使用校验框架，如果校验信息十分复杂的情况下要用validate()进行校验，目的都是将错误信息放到fielderror级别里面去。