XMLpracticalapplicationoverview
XMLserving as一种common data交换格式, in 现代计算机systemin has 着广泛 application. 它 平台无关性, 自我describes性 and 良 good readable 性使其成 for 不同system之间data交换 理想选择. 以 under is XML in practicalprojectin 一些commonapplication场景:
- configurationfile: 许 many application程序usingXMLserving asconfigurationfile格式, such asWebserver, applicationserver, datalibraryetc.
- data交换: in 不同system, 平台 and programminglanguage之间交换data
- Webservice: such asSOAP and RESTful Webservice, usingXMLformatrequest and responsedata
- RSS and Atom: 用于release and subscribe new 闻, 博客 and other in 容
- documentation标记: such asDocBook, XHTMLetc., 用于structure化documentation creation and processing
- datastore: 用于storestructure化data, such asconfigurationinformation, 元dataetc.
- message传递: in distributedsystemin传递message, such asJMS, AMQPetc.
XMLconfigurationfile
XML常被用作application程序 configurationfile格式, 因 for 它具 has 良 good readable 性 and structure化features. 许 many 流行 软件 and framework都usingXMLserving asconfigurationfile格式.
1. Webserverconfiguration
Apache and Nginxetc.WebserverusingXML or class似XML 格式来configuration虚拟主机, proxy规则, security设置etc..
Tomcatserverconfigurationexample
<?xml version='1.0' encoding='utf-8'?>
<Server port="8005" shutdown="SHUTDOWN">
<Service name="Catalina">
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
<Engine name="Catalina" defaultHost="localhost">
<Host name="localhost" appBase="webapps"
unpackWARs="true" autodeployment="true">
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
prefix="localhost_access_log" suffix=".txt"
pattern="%h %l %u %t "%r" %s %b" />
</Host>
</Engine>
</Service>
</Server>
2. Springframeworkconfiguration
SpringframeworkusingXMLconfigurationfile来定义Bean, 依赖注入 and AOPetc..
Springconfigurationfileexample
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- 启用注解扫描 -->
<context:component-scan base-package="com.example" />
<!-- configurationdatasources -->
<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/test" />
<property name="username" value="root" />
<property name="password" value="password" />
</bean>
<!-- configurationtransactionmanagement器 -->
<bean id="transactionmanagementr" class="org.springframework.jdbc.datasource.DataSourceTransactionmanagementr">
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 启用transaction注解 -->
<tx:annotation-driven transaction-manager="transactionmanagementr" />
</beans>
XMLdata交换
XML is 不同system之间data交换 常用格式, 尤其 is in 异构systemin. 它可以表示 complex datastructure, 并且易于解析 and 生成.
1. Webservicedata交换
SOAP (Simple Object Access Protocol) WebserviceusingXML来formatrequest and responsedata.
SOAPrequestexample
<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:ser="http://www.example.com/webservice">
<soap:Header/>
<soap:Body>
<ser:GetWeatherRequest>
<ser:City>北京</ser:City>
<ser:Date>2025-01-15</ser:Date>
</ser:GetWeatherRequest>
</soap:Body>
</soap:Envelope>
SOAPresponseexample
<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:ser="http://www.example.com/webservice">
<soap:Header/>
<soap:Body>
<ser:GetWeatherResponse>
<ser:WeatherInfo>
<ser:City>北京</ser:City>
<ser:Date>2025-01-15</ser:Date>
<ser:Temperature>-5°C ~ 5°C</ser:Temperature>
<ser:Condition>晴</ser:Condition>
<ser:Humidity>45%</ser:Humidity>
</ser:WeatherInfo>
</ser:GetWeatherResponse>
</soap:Body>
</soap:Envelope>
2. dataimportexport
许 many application程序supportusingXML格式import and exportdata, such as办公软件, CRMsystem, CMSsystemetc..
联系人dataXMLexample
<?xml version="1.0" encoding="UTF-8"?>
<contacts>
<contact id="1">
<name>
<first>张</first>
<last>三</last>
</name>
<email>zhangsan@example.com</email>
<phone type="mobile">13800138000</phone>
<address>
<street>in关村 big 街1号</street>
<city>北京</city>
<zipcode>100080</zipcode>
<country>in国</country>
</address>
</contact>
<contact id="2">
<name>
<first>李</first>
<last>四</last>
</name>
<email>lisi@example.com</email>
<phone type="mobile">13900139000</phone>
<phone type="work">010-12345678</phone>
<address>
<street>人民 big 道1号</street>
<city> on 海</city>
<zipcode>200000</zipcode>
<country>in国</country>
</address>
</contact>
</contacts>
XML in 容release
XML常用于 in 容release and subscribe, such asRSS (Really Simple Syndication) and Atom格式.
1. RSS Feed
RSS is a用于release经常update in 容 格式, such as博客文章, new 闻, 音频 and 视频etc..
RSS Feedexample
<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
<channel>
<title>techniques博客</title>
<link>http://www.example.com/blog</link>
<atom:link href="http://www.example.com/blog/rss.xml" rel="self" type="application/rss+xml" />
<description>分享techniquesknowledge and experience</description>
<language>zh-CN</language>
<pubDate>Wed, 15 Jan 2025 10:30:00 +0800</pubDate>
<lastbuildDate>Wed, 15 Jan 2025 10:30:00 +0800</lastbuildDate>
<generator>WordPress 6.4</generator>
<item>
<title>XMLBasicstutorial</title>
<link>http://www.example.com/blog/xml-basics</link>
<comments>http://www.example.com/blog/xml-basics#comments</comments>
<pubDate>Wed, 15 Jan 2025 09:00:00 +0800</pubDate>
<category><![CDATA[XML]]></category>
<guid isPermaLink="false">http://www.example.com/blog/?p=1</guid>
<description><![CDATA[LearningXML basicconcepts, 语法 and application. ]]></description>
<content:encoded><![CDATA[<p>XML is a可scale标记language, 用于store and 传输data. 本文将介绍XML basicconcepts, 语法规则 and commonapplication. </p>]]></content:encoded>
</item>
<item>
<title>XSLT转换techniques</title>
<link>http://www.example.com/blog/xslt-transformations</link>
<comments>http://www.example.com/blog/xslt-transformations#comments</comments>
<pubDate>Tue, 14 Jan 2025 14:30:00 +0800</pubDate>
<category><![CDATA[XSLT]]></category>
<guid isPermaLink="false">http://www.example.com/blog/?p=2</guid>
<description><![CDATA[深入UnderstandXSLT转换techniques, implementationXMLdata flexibleprocessing. ]]></description>
<content:encoded><![CDATA[<p>XSLT is a用于将XMLdocumentation转换 for other格式 language. 本文将介绍XSLT basic原理, 语法 and applicationexample. </p>]]></content:encoded>
</item>
</channel>
</rss>
XMLmessage传递
in distributedsystemin, XML常用于message传递, such asJMS (Java Message Service) and AMQP (advanced Message Queuing Protocol) etc.messagein间件.
JMSmessageXMLexample
<?xml version="1.0" encoding="UTF-8"?>
<orderMessage>
<messageHeader>
<messageId>MSG-20250115-001</messageId>
<messageType>ORDER_CREATE</messageType>
<timestamp>2025-01-15T10:30:00+08:00</timestamp>
<sender>order-service</sender>
<receiver>payment-service</receiver>
</messageHeader>
<messageBody>
<order>
<orderId>ORD-20250115-001</orderId>
<customerId>CUST-001</customerId>
<orderDate>2025-01-15T10:25:00+08:00</orderDate>
<totalAmount>199.00</totalAmount>
<currency>CNY</currency>
<items>
<item>
<productId>PROD-001</productId>
<productName>XMLBasicstutorial</productName>
<quantity>1</quantity>
<unitPrice>99.00</unitPrice>
</item>
<item>
<productId>PROD-002</productId>
<productName>XSLT转换techniques</productName>
<quantity>1</quantity>
<unitPrice>89.00</unitPrice>
</item>
</items>
<paymentInfo>
<paymentMethod>ALIPAY</paymentMethod>
<paymentStatus>PENDING</paymentStatus>
</paymentInfo>
</order>
</messageBody>
</orderMessage>
XMLdocumentation标记
XML常用于structure化documentation 标记, such asDocBook, XHTML, SVGetc..
1. SVG (Scalable Vector Graphics)
SVG is a用于describes二维矢量graph形 XML格式.
SVGgraph形example
<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg" width="400" height="300">
<!-- 背景矩形 -->
<rect width="400" height="300" fill="#f0f0f0" />
<!-- 标题文本 -->
<text x="200" y="30" font-family="Arial" font-size="24" fill="#4285F4" text-anchor="middle">XMLapplicationexample</text>
<!-- 圆形 -->
<circle cx="100" cy="150" r="50" fill="#34A853" stroke="#2d8f48" stroke-width="2" />
<text x="100" y="155" font-family="Arial" font-size="14" fill="white" text-anchor="middle">configurationfile</text>
<!-- 矩形 -->
<rect x="180" y="100" width="100" height="100" fill="#FBBC05" stroke="#f9ab00" stroke-width="2" />
<text x="230" y="155" font-family="Arial" font-size="14" fill="white" text-anchor="middle">data交换</text>
<!-- many edge形 -->
<polygon points="350,150 300,100 300,200" fill="#EA4335" stroke="#d93025" stroke-width="2" />
<text x="325" y="155" font-family="Arial" font-size="14" fill="white" text-anchor="middle">Webservice</text>
<!-- 连接线 -->
<line x1="150" y1="150" x2="180" y2="150" stroke="#555" stroke-width="2" />
<line x1="280" y1="150" x2="300" y2="150" stroke="#555" stroke-width="2" />
</svg>
2. XHTML (Extensible Hypertext Markup Language)
XHTML is HTML XMLversion, 它将HTML标记language and XML 严格语法结合起来.
XHTMLdocumentationexample
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-CN" lang="zh-CN">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>XHTMLexample</title>
<link rel="stylesheet" type="text/css" href="style.css" />
</head>
<body>
<div id="header">
<h1>网站标题</h1>
<ul id="nav">
<li><a href="index.html">首页</a></li>
<li><a href="about.html">About Us</a></li>
<li><a href="contact.html">Contact Us</a></li>
</ul>
</div>
<div id="content">
<h2>文章标题</h2>
<p>这 is 一篇XHTML格式 文章example. </p>
<img src="image.jpg" alt="graph片example" width="300" height="200" />
</div>
<div id="footer">
<p>© 2025 网站名称. All rights reserved.</p>
</div>
</body>
</html>
实践case: usingXMLimplementationconfigurationmanagementsystem
casedescribes
creation一个 simple configurationmanagementsystem, usingXMLstore and managementapplication程序 configurationinformation. system应该able toimplementation以 under functions:
- 加载XMLconfigurationfile
- 读取configurationparameter
- modifyconfigurationparameter
- 保存configurationfile
- verificationconfigurationfile has 效性
implementation步骤
- designXMLconfigurationfile structure
- creationXML Schema or DTD来verificationconfigurationfile
- implementationconfigurationmanagementclass, 用于加载, 读取, modify and 保存configuration
- writingtestcodeverificationsystemfunctions
最终code
XMLconfigurationfile: config.xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="config.xsl"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="config.xsd">
<application>
<name>configurationmanagementsystem</name>
<version>1.0.0</version>
<description>用于managementapplication程序configuration system</description>
</application>
<database>
<driver>com.mysql.jdbc.Driver</driver>
<url>jdbc:mysql://localhost:3306/config_db</url>
<username>root</username>
<password>password</password>
<maxConnections>10</maxConnections>
<timeout>30</timeout>
</database>
<logging>
<level>INFO</level>
<file>logs/app.log</file>
<maxFileSize>10MB</maxFileSize>
<backupCount>5</backupCount>
</logging>
<server>
<host>localhost</host>
<port>8080</port>
<ssl>false</ssl>
<maxThreads>50</maxThreads>
</server>
</config>
XML Schema: config.xsd
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="config">
<xs:complexType>
<xs:sequence>
<xs:element name="application">
<xs:complexType>
<xs:sequence>
<xs:element name="name" type="xs:string" />
<xs:element name="version" type="xs:string" />
<xs:element name="description" type="xs:string" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="database">
<xs:complexType>
<xs:sequence>
<xs:element name="driver" type="xs:string" />
<xs:element name="url" type="xs:string" />
<xs:element name="username" type="xs:string" />
<xs:element name="password" type="xs:string" />
<xs:element name="maxConnections" type="xs:integer" />
<xs:element name="timeout" type="xs:integer" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="logging">
<xs:complexType>
<xs:sequence>
<xs:element name="level" type="xs:string" />
<xs:element name="file" type="xs:string" />
<xs:element name="maxFileSize" type="xs:string" />
<xs:element name="backupCount" type="xs:integer" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="server">
<xs:complexType>
<xs:sequence>
<xs:element name="host" type="xs:string" />
<xs:element name="port" type="xs:integer" />
<xs:element name="ssl" type="xs:boolean" />
<xs:element name="maxThreads" type="xs:integer" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
XSLT样式表: config.xsl
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<html>
<head>
<title>configurationmanagementsystem</title>
<style>
body {
font-family: Arial, sans-serif;
margin: 20px;
}
h1 {
color: #4285F4;
}
h2 {
color: #34A853;
margin-top: 30px;
}
.config-section {
background-color: #f0f0f0;
padding: 15px;
margin: 10px 0;
border-radius: 5px;
}
.config-item {
margin: 10px 0;
}
.config-label {
font-weight: bold;
display: inline-block;
width: 150px;
}
</style>
</head>
<body>
<h1>configurationmanagementsystem</h1>
<div class="config-section">
<h2>application程序information</h2>
<div class="config-item">
<span class="config-label">名称: </span>
<span><xsl:value-of select="config/application/name" /></span>
</div>
<div class="config-item">
<span class="config-label">version: </span>
<span><xsl:value-of select="config/application/version" /></span>
</div>
<div class="config-item">
<span class="config-label">describes: </span>
<span><xsl:value-of select="config/application/description" /></span>
</div>
</div>
<div class="config-section">
<h2>datalibraryconfiguration</h2>
<div class="config-item">
<span class="config-label">驱动: </span>
<span><xsl:value-of select="config/database/driver" /></span>
</div>
<div class="config-item">
<span class="config-label">URL: </span>
<span><xsl:value-of select="config/database/url" /></span>
</div>
<div class="config-item">
<span class="config-label">user名: </span>
<span><xsl:value-of select="config/database/username" /></span>
</div>
<div class="config-item">
<span class="config-label">password: </span>
<span>******</span>
</div>
<div class="config-item">
<span class="config-label">最 big connections: </span>
<span><xsl:value-of select="config/database/maxConnections" /></span>
</div>
<div class="config-item">
<span class="config-label">超时时间: </span>
<span><xsl:value-of select="config/database/timeout" /></span>
</div>
</div>
<div class="config-section">
<h2>logconfiguration</h2>
<div class="config-item">
<span class="config-label">log级别: </span>
<span><xsl:value-of select="config/logging/level" /></span>
</div>
<div class="config-item">
<span class="config-label">logfile: </span>
<span><xsl:value-of select="config/logging/file" /></span>
</div>
<div class="config-item">
<span class="config-label">最 big file big small : </span>
<span><xsl:value-of select="config/logging/maxFileSize" /></span>
</div>
<div class="config-item">
<span class="config-label">backup数量: </span>
<span><xsl:value-of select="config/logging/backupCount" /></span>
</div>
</div>
<div class="config-section">
<h2>serverconfiguration</h2>
<div class="config-item">
<span class="config-label">主机: </span>
<span><xsl:value-of select="config/server/host" /></span>
</div>
<div class="config-item">
<span class="config-label">端口: </span>
<span><xsl:value-of select="config/server/port" /></span>
</div>
<div class="config-item">
<span class="config-label">SSL: </span>
<span><xsl:value-of select="config/server/ssl" /></span>
</div>
<div class="config-item">
<span class="config-label">最 big thread数: </span>
<span><xsl:value-of select="config/server/maxThreads" /></span>
</div>
</div>
</body>
</html>
</xsl:template>
</xsl:stylesheet>
互动练习
练习1: designXMLconfigurationfile
for 一个 in 线购物systemdesignXMLconfigurationfile, 要求package含以 under configurationinformation:
- systembasicinformation (名称, version, describes)
- datalibraryconfiguration (驱动, URL, user名, password, 连接池configuration)
- cacheconfiguration (class型, 过期时间, 最 big big small )
- 支付configuration (support 支付方式, APIkey)
- logconfiguration (级别, filepath, 最 big file big small )
XMLconfigurationfiledesignsuch as under :
<?xml version="1.0" encoding="UTF-8"?>
<config>
<system>
<name> in 线购物system</name>
<version>2.0.0</version>
<description>一个functions完整 in 线购物平台</description>
<environment>production</environment>
</system>
<database>
<driver>com.mysql.jdbc.Driver</driver>
<url>jdbc:mysql://localhost:3306/shop_db?useSSL=false&serverTimezone=UTC</url>
<username>shop_user</username>
<password>shop_password</password>
<connectionPool>
<initialSize>5</initialSize>
<maxActive>20</maxActive>
<maxIdle>10</maxIdle>
<minIdle>3</minIdle>
<maxWait>30000</maxWait>
</connectionPool>
</database>
<cache>
<type>redis</type>
<host>localhost</host>
<port>6379</port>
<password></password>
<database>0</database>
<expiration>3600</expiration>
<maxSize>10000</maxSize>
</cache>
<payment>
<methods>
<method name="alipay" enabled="true">
<appId>2021000119656789</appId>
<privateKey>MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQ...</privateKey>
<publicKey>MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA...</publicKey>
</method>
<method name="wechat" enabled="true">
<appId>wx1234567890abcdef</appId>
<mchId>1234567890</mchId>
<apiKey>abcdef1234567890abcdef1234567890</apiKey>
</method>
<method name="creditcard" enabled="false">
<gatewayUrl>https://payment.example.com/creditcard</gatewayUrl>
<merchantId>MERCHANT-001</merchantId>
</method>
</methods>
</payment>
<logging>
<level>INFO</level>
<file>/var/log/shop/shop.log</file>
<maxFileSize>50MB</maxFileSize>
<backupCount>10</backupCount>
<pattern>%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n</pattern>
</logging>
<security>
<encryption>
<algorithms>AES-256-GCM</algorithms>
<key>shop_encryption_key_2025</key>
</encryption>
<authentication>
<jwt>
<secret>shop_jwt_secret_2025</secret>
<expiration>86400</expiration>
</jwt>
</authentication>
</security>
</config>