Java对象校验框架之Oval

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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

&nbsp;&nbsp; "-//OVal/OVal Configuration DTD 1.3//EN"

&nbsp;&nbsp; "<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>"

&nbsp;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"

>

&nbsp;<!-- define a constraint set -->

&nbsp;<!--<constraintSet id="user.userid">

&nbsp;&nbsp;<notNull message="{context} is null" />

&nbsp;&nbsp;<matchPattern message="{context} does not match the pattern {pattern}">

&nbsp;&nbsp;&nbsp;<pattern pattern="<a href="file://\\d{15}|\\d{17}+[\\dX">\\d{15}|\\d{17}+[\\dX</a>]" flags="0" />

&nbsp;&nbsp;</matchPattern>

&nbsp;</constraintSet>--></p><p>&nbsp;<class type="com.haove.oval.TrainData" overwrite="false" applyFieldConstraintsToSetters="false">

&nbsp;&nbsp;

&nbsp;&nbsp;<field name="sfzh">

&nbsp;&nbsp;&nbsp;<matchPattern message="身份证号不符合规则">

&nbsp;&nbsp;&nbsp;<pattern pattern="[0-9]{15}|[0-9]{17}[0-9X]" flags="0" />

&nbsp;&nbsp;&nbsp;</matchPattern>

&nbsp;&nbsp;</field>

&nbsp;&nbsp;

&nbsp;&nbsp;<field name="xm">

&nbsp;&nbsp;&nbsp;<length min="1" max="24" message="姓名为 {min} 至 {max}个字符" />

&nbsp;&nbsp;&nbsp;<validateWithMethod methodName="isValid" parameterType="java.lang.String" message="姓名与学籍库不一致"/>

&nbsp;&nbsp;</field>

&nbsp;&nbsp;

&nbsp;&nbsp;<field name="qjStart">

&nbsp;&nbsp;&nbsp;<length min="1" message="区间起点不能少于{min}个字符" />

&nbsp;&nbsp;</field>

&nbsp;&nbsp;

&nbsp;&nbsp;<field name="qjEnd" overwrite="true">

&nbsp;&nbsp;&nbsp;<length min="1" message="区间终点不能少于{min}个字符" />

&nbsp;&nbsp;</field></p><p>&nbsp;&nbsp;<field name="rxrq">

&nbsp;&nbsp;&nbsp;<matchPattern message="入学日期为8位数字">

&nbsp;&nbsp;&nbsp;<pattern pattern="[0-9]{8}"/>

&nbsp;&nbsp;&nbsp;</matchPattern>

&nbsp;&nbsp;</field>

&nbsp;&nbsp;<field name="yhcs">

&nbsp;&nbsp;&nbsp;<matchPattern message="优惠次数为一位或两位数字">

&nbsp;&nbsp;&nbsp;<pattern pattern="[0-9]{1,2}" flags="0" />

&nbsp;&nbsp;&nbsp;</matchPattern>

&nbsp;&nbsp;</field>

&nbsp;&nbsp;

&nbsp;&nbsp;<field name="kxlh">

&nbsp;&nbsp;&nbsp;<length min="1" message="卡序列号不能少于{min}个字符" />

&nbsp;&nbsp;</field>

&nbsp;</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){

        }

    }

}