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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://www.mamicode.com/http://oval.sourceforge.net/oval-configuration-1.3.dtd">http://oval.sourceforge.net/oval-configuration-1.3.dtd</a>">--><oval xmlns="<a href="http://www.mamicode.com/http://oval.sf.net/oval-configuration">http://oval.sf.net/oval-configuration</a>" xmlns:xsi="<a href="http://www.mamicode.com/http://http://www.w3.org/2001/XMLSchema-instance">http://http://www.w3.org/2001/XMLSchema-instance</a>"&nbsp;xsi:schemaLocation="<a href="http://www.mamicode.com/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="http://www.mamicode.com/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