java自学:XML
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2024-03-06 10:36:25
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1、xml基础
1.1、概述
1.2、快速入门
1.3、组成部分
2、xml约束
2.1、概述
2.2、dtd
dtd文件
<!ELEMENT students (student*) >
<!ELEMENT student (name,age,sex)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT age (#PCDATA)>
<!ELEMENT sex (#PCDATA)>
<!ATTLIST student number ID #REQUIRED>
xml文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE students SYSTEM "student.dtd">
<students>
<student number="itcast_0001">
<name>tom</name>
<age>18</age>
<sex>male</sex>
</student>
</students>
2.3、schema
xsd文件
<?xml version="1.0"?>
<xsd:schema xmlns="http://www.itcast.cn/xml"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.itcast.cn/xml" elementFormDefault="qualified">
<xsd:element name="students" type="studentsType"/>
<xsd:complexType name="studentsType">
<xsd:sequence>
<xsd:element name="student" type="studentType" minOccurs="0" maxOccurs="unbounded"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="studentType">
<xsd:sequence>
<xsd:element name="name" type="xsd:string"/>
<xsd:element name="age" type="ageType" />
<xsd:element name="sex" type="sexType" />
</xsd:sequence>
<xsd:attribute name="number" type="numberType" use="required"/>
</xsd:complexType>
<xsd:simpleType name="sexType">
<xsd:restriction base="xsd:string">
<xsd:enumeration value="male"/>
<xsd:enumeration value="female"/>
</xsd:restriction>
</xsd:simpleType>
<xsd:simpleType name="ageType">
<xsd:restriction base="xsd:integer">
<xsd:minInclusive value="0"/>
<xsd:maxInclusive value="256"/>
</xsd:restriction>
</xsd:simpleType>
<xsd:simpleType name="numberType">
<xsd:restriction base="xsd:string">
<xsd:pattern value="heima_\d{4}"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:schema>
xml文件
<?xml version="1.0" encoding="UTF-8" ?>
<!--
1.填写xml文档的根元素
2.引入xsi前缀. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
3.引入xsd文件命名空间. xsi:schemaLocation="http://www.itcast.cn/xml student.xsd"
4.为每一个xsd约束声明一个前缀,作为标识 xmlns="http://www.itcast.cn/xml"
-->
<students xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.itcast.cn/xml"
xsi:schemaLocation="http://www.itcast.cn/xml student.xsd"
>
<student number="heima_0001">
<name>tom</name>
<age>18</age>
<sex>male</sex>
</student>
</students>