Java对象校验框架之Oval

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){

        }
    }
}

参考：http://blog.csdn.net/haove/article/details/6901366

Java对象校验框架之Oval