只要有接口，就会有参数的校验，目前开源的校验框架已经非常多了，不过不得不提一下Oval。
OVal 是一个可扩展的Java对象数据验证框架，验证的规则可以通过配置文件、Annotation、POJOs 进行设定。可以使用纯 Java 语言、JavaScript 、Groovy 、BeanShell 等进行规则的编写。
使用起来也非常简单
public class OvalTest {
@Min(20)
private int age;
@Length(min = 6, max = 10)
private String name;
public static void main(String[] args) {
OvalTest ovalTest = new OvalTest();
ovalTest.age = 10;
ovalTest.name = "kolor";
Validator validator = new Validator();
List<ConstraintViolation> ret = validator.validate(ovalTest);
System.out.println(ret);
}
}
<p><?xml version="1.0" encoding="UTF-8"?>
<!--
<!DOCTYPE oval PUBLIC
"-//OVal/OVal Configuration DTD 1.3//EN"
"<a href="http://oval.sourceforge.net/oval-configuration-1.3.dtd">http://oval.sourceforge.net/oval-configuration-1.3.dtd</a>">
-->
<oval xmlns="<a href="http://oval.sf.net/oval-configuration">http://oval.sf.net/oval-configuration</a>" xmlns:xsi="<a href="http://http://www.w3.org/2001/XMLSchema-instance">http://http://www.w3.org/2001/XMLSchema-instance</a>"
xsi:schemaLocation="<a href="http://oval.sf.net/oval-configuration">http://oval.sf.net/oval-configuration</a> ../../../../../../../../main/resources/net/sf/oval/configuration/xml/oval-configuration.xsd"
>
<!-- define a constraint set -->
<!--<constraintSet id="user.userid">
<notNull message="{context} is null" />
<matchPattern message="{context} does not match the pattern {pattern}">
<pattern pattern="<a href="file://\\d{15}|\\d{17}+[\\dX">\\d{15}|\\d{17}+[\\dX</a>]" flags="0" />
</matchPattern>
</constraintSet>--></p><p> <class type="com.haove.oval.TrainData" overwrite="false" applyFieldConstraintsToSetters="false">
<field name="sfzh">
<matchPattern message="身份证号不符合规则">
<pattern pattern="[0-9]{15}|[0-9]{17}[0-9X]" flags="0" />
</matchPattern>
</field>
<field name="xm">
<length min="1" max="24" message="姓名为 {min} 至 {max}个字符" />
<validateWithMethod methodName="isValid" parameterType="java.lang.String" message="姓名与学籍库不一致"/>
</field>
<field name="qjStart">
<length min="1" message="区间起点不能少于{min}个字符" />
</field>
<field name="qjEnd" overwrite="true">
<length min="1" message="区间终点不能少于{min}个字符" />
</field></p><p> <field name="rxrq">
<matchPattern message="入学日期为8位数字">
<pattern pattern="[0-9]{8}"/>
</matchPattern>
</field>
<field name="yhcs">
<matchPattern message="优惠次数为一位或两位数字">
<pattern pattern="[0-9]{1,2}" flags="0" />
</matchPattern>
</field>
<field name="kxlh">
<length min="1" message="卡序列号不能少于{min}个字符" />
</field>
</class>
</oval></p>
这个xml里包含了<notNull />,<notBlank />,<validateWithMethod />,<dateRange />,<pattern />等几种校验，比较有特点的是可以自定义方法校验validateWithMethod，有了这个就可以将校验扩展的更加强大，比如说可以将数据跟数据库里的数据进行比较校验。还有其他校验，可以参考源码，或问我。
另外，经查源码，发现方法public List<ConstraintViolation> validateFieldValue(final Object validatedObject, final Field validatedField, final Object fieldValueToValidate)可以只校验自己想校验的field，不会校验全部field，这个在有些时候还是蛮有用的。
另外附上，使用xml校验的java源码例子：
import java.lang.reflect.Field;
import java.util.List;
import net.sf.oval.ConstraintViolation;
import net.sf.oval.Validator;
import net.sf.oval.configuration.xml.XMLConfigurer;
public class TrainData {
private String xm;
private String sfzh;
private String qjStart;
private String qjEnd;
private String rxrq;
// @ValidateWithMethod(methodName = "isValid", parameterType = String.class)
private String yhcs;
private String kxlh;
public TrainData(){}
public TrainData(String xm, String sfzh, String qjStart, String qjEnd, String rxrq, String yhcs, String kxlh){
this.xm = xm;
this.sfzh = sfzh;
this.qjStart = qjStart;
this.qjEnd = qjEnd;
this.rxrq = rxrq;
this.yhcs = yhcs;
this.kxlh = kxlh;
}
private boolean isValid(String xm) {
//to do 数据库根据身份证号查询出的姓名进行比较
if("1".equals(xm))
return true;
return false;
}
public static void main(String[] args) {
try{
TrainData data = new TrainData("刘艳梅","11010619770201304","","","20050101","2","123");
XMLConfigurer x2 = new XMLConfigurer();
x2.fromXML(XMLConfigurationTest.class.getResourceAsStream("TrainDataValidation.xml"));
Validator validator = new Validator(x2);
// Validator validator = new Validator();
// Field f=TrainData.class.getDeclaredField("xm");
// List<ConstraintViolation> violations = validator.validateFieldValue(new TrainData(), f, "12");
List<ConstraintViolation> violations = validator.validate(data);
for(ConstraintViolation var:violations){
System.out.println(var.getMessage());
}
}catch(Exception ex){
}
}
}
参考：http://blog.csdn.net/haove/article/details/6901366
Java对象校验框架之Oval
时间： 2024-08-01 00:16:43