使用XSD验证xml

使用XSD验证XML

本文简单介绍如何使用XSD验证自己的xml。项目中我们经常使用xml作为配置或者数据交互的文件格式，在解析XML前最好验证一下或者在生成xml文件后验证一下生成的文件格式是正确，这样可以避免解析时出现一些低级的xml文件不符合预定义格式的错误。

CSDN无法正确显示这些xsd， xml以及java代码，如果需要请参考http://yqbjtu.blog.163.com/blog/static/529426201672674444341/
第一步显示定义XSD，这个参考网上很多教程，本文给出一个简单实例。

order_v1.xsd

<?xml version="1.0" encoding="UTF-8"?>
<!--
- Licensed Text
-->
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"elementFormDefault="qualified"targetNamespace="http://demo.com/OrderXMLSchema_v1"xmlns:tns="http://demo.com/OrderXMLSchema_v1"><xsd:element name="shipOrder" type="tns:shipOrder"></xsd:element><xsd:complexType name="shipOrder"><xsd:sequence maxOccurs="1" minOccurs="1"><xsd:element name="orderperson" type="xsd:string" minOccurs="1" maxOccurs="1"></xsd:element><xsd:element name="order-description" type="xsd:string" minOccurs="1" maxOccurs="1"></xsd:element><xsd:element name="items" type="tns:items" maxOccurs="1" minOccurs="1"></xsd:element><xsd:element name="item-2" type="tns:item-2" maxOccurs="unbounded" minOccurs="1"></xsd:element></xsd:sequence></xsd:complexType><xsd:complexType name="items"><xsd:sequence maxOccurs="unbounded" minOccurs="1"><xsd:element name="item" minOccurs="1" maxOccurs="1"><xsd:complexType><xsd:simpleContent><xsd:extension base="xsd:string"><xsd:attribute name="index" type="xsd:unsignedLong" /></xsd:extension></xsd:simpleContent></xsd:complexType></xsd:element></xsd:sequence></xsd:complexType><xsd:complexType name="item-2"><xsd:sequence maxOccurs="1" minOccurs="1"><xsd:element name="title" type="xsd:string"/><xsd:element name="note" type="xsd:string" minOccurs="0"/><xsd:element name="quantity" type="xsd:positiveInteger"/><xsd:element name="price" type="xsd:decimal"/></xsd:sequence><xsd:attribute name="index" type="xsd:unsignedLong" /></xsd:complexType></xsd:schema>

Xml文件

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!--
- Licensed Description.
-->
<shipOrder xmlns="http://demo.com/OrderXMLSchema_v1"xmlns:server="http://demo.com/OrderXMLSchema_v1"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><orderperson>John Smith</orderperson><order-description>This document is used for demo sxN#</order-description><items><item index="1">some potatoes</item><item index="2">some tomatoes</item></items><item-2 index="1"><title>Hide your heart</title><quantity>1</quantity><price>9.90</price></item-2><item-2 index="2"><title>Hide your heart</title><note>this is for testing note, it is not required</note><quantity>1</quantity><price>9.90</price></item-2></shipOrder>

最后是我们的java代码

import java.io.File;
import java.io.UnsupportedEncodingException;import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;import org.xml.sax.SAXException;public class index="2"><title>Hide your heart</title><note>this is for testing note, it is not required</note><quantity>1</quantity><price>9.90</price></item-2>

其余部分基本类似，比较需要注意的是item类型，它有attribute也有value。

 <item index="2"> some tomatoes </item>

它的定义是

        <xsd:element name="item" minOccurs="1" maxOccurs="1"><xsd:complexType><xsd:simpleContent><xsd:extension base="xsd:string"><xsd:attribute name="index" type="xsd:unsignedLong" /></xsd:extension></xsd:simpleContent></xsd:complexType></xsd:element>

图片