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dom4j是一個java 的XML API，用來讀寫XML文件。

使用dom4j解析XML文件，首先需要在官網下載dom4j-1.6.1.zip。

URL：http://sourceforge.net/projects/dom4j/files/latest/download?source=files。

創建的Java 工程目錄結構：

我們以解析數據庫連接和配置文件c3p0.xml為例。

c3p0.xml

<?xml?version="1.0"?encoding="UTF-8"?> <c3p0-config><init><name>Oracle</name><driver>oracle.jdbc.driver.OracleDriver</driver><url>jdbc:oracle:thin:@192.168.1.29:1521:orcl</url><user>orcl</user><password>orcl</password><initPoolSize>5</initPoolSize><minPoolSize>2</minPoolSize><maxPoolSize>20</maxPoolSize><maxStatements>20</maxStatements><maxIdleTime>60</maxIdleTime><acquireIncrement>5</acquireIncrement><checkoutTimeout>3000</checkoutTimeout></init> </c3p0-config>

C3p0.java

package?com.xml.parse.file;public?class?C3p0?{private?String?name;private?String?driver;private?String?url;private?String?user;private?String?password;private?String?initPoolSize;private?String?minPoolSize;private?String?maxPoolSize;private?String?maxStatements;private?String?maxIdleTime;private?String?acquireIncrement;private?String?checkoutTimeout;public?C3p0()?{}public?C3p0(String?name,?String?driver,?String?url,?String?user,String?password,?String?initPoolSize,?String?minPoolSize,String?maxPoolSize,?String?maxStatements,?String?maxIdleTime,String?acquireIncrement,?String?checkoutTimeout)?{this.name?=?name;this.driver?=?driver;this.url?=?url;this.user?=?user;this.password?=?password;this.initPoolSize?=?initPoolSize;this.minPoolSize?=?minPoolSize;this.maxPoolSize?=?maxPoolSize;this.maxStatements?=?maxStatements;this.maxIdleTime?=?maxIdleTime;this.acquireIncrement?=?acquireIncrement;this.checkoutTimeout?=?checkoutTimeout;}public?String?getName()?{return?name;}public?void?setName(String?name)?{this.name?=?name;}public?String?getDriver()?{return?driver;}public?void?setDriver(String?driver)?{this.driver?=?driver;}public?String?getUrl()?{return?url;}public?void?setUrl(String?url)?{this.url?=?url;}public?String?getUser()?{return?user;}public?void?setUser(String?user)?{this.user?=?user;}public?String?getPassword()?{return?password;}public?void?setPassword(String?password)?{this.password?=?password;}public?String?getInitPoolSize()?{return?initPoolSize;}public?void?setInitPoolSize(String?initPoolSize)?{this.initPoolSize?=?initPoolSize;}public?String?getMinPoolSize()?{return?minPoolSize;}public?void?setMinPoolSize(String?minPoolSize)?{this.minPoolSize?=?minPoolSize;}public?String?getMaxPoolSize()?{return?maxPoolSize;}public?void?setMaxPoolSize(String?maxPoolSize)?{this.maxPoolSize?=?maxPoolSize;}public?String?getMaxStatements()?{return?maxStatements;}public?void?setMaxStatements(String?maxStatements)?{this.maxStatements?=?maxStatements;}public?String?getMaxIdleTime()?{return?maxIdleTime;}public?void?setMaxIdleTime(String?maxIdleTime)?{this.maxIdleTime?=?maxIdleTime;}public?String?getAcquireIncrement()?{return?acquireIncrement;}public?void?setAcquireIncrement(String?acquireIncrement)?{this.acquireIncrement?=?acquireIncrement;}public?String?getCheckoutTimeout()?{return?checkoutTimeout;}public?void?setCheckoutTimeout(String?checkoutTimeout)?{this.checkoutTimeout?=?checkoutTimeout;}}

ParseXML.java：

package?com.xml.parse.file;import?java.io.InputStream;import?org.dom4j.Document; import?org.dom4j.DocumentException; import?org.dom4j.Element; import?org.dom4j.io.SAXReader;public?class?ParseXML?{private?static?ParseXML?instance?=?null;private?C3p0?c3p0?=?new?C3p0();public?ParseXML(){SAXReader??reader?=?new?SAXReader();InputStream?in?=?Thread.currentThread().getContextClassLoader().getResourceAsStream("config/c3p0.xml");try?{Document?document?=?reader.read(in);Element?root?=?document.getRootElement();Element?e?=?root.element("init");Element?name?=?(Element)e.element("name");Element?driver?=?(Element)e.element("driver");Element?url?=?(Element)e.element("url");Element?user?=?(Element)e.element("user");Element?password?=?(Element)e.element("password");Element?initPoolSize?=?(Element)e.element("initPoolSize");Element?minPoolSize?=?(Element)e.element("minPoolSize");Element?maxPoolSize?=?(Element)e.element("maxPoolSize");Element?maxStatements?=?(Element)e.element("maxStatements");Element?maxIdleTime?=?(Element)e.element("maxIdleTime");Element?acquireIncrement?=?(Element)e.element("acquireIncrement");Element?checkoutTimeout?=?(Element)e.element("checkoutTimeout");c3p0.setName(name.getStringValue());c3p0.setDriver(driver.getStringValue());c3p0.setUrl(url.getStringValue());c3p0.setUser(user.getStringValue());c3p0.setPassword(password.getStringValue());c3p0.setInitPoolSize(initPoolSize.getStringValue());c3p0.setMinPoolSize(minPoolSize.getStringValue());c3p0.setMaxPoolSize(maxPoolSize.getStringValue());c3p0.setMaxStatements(maxStatements.getStringValue());c3p0.setMaxIdleTime(maxIdleTime.getStringValue());c3p0.setAcquireIncrement(acquireIncrement.getStringValue());c3p0.setCheckoutTimeout(checkoutTimeout.getStringValue());}?catch?(DocumentException?e)?{e.printStackTrace();}}public?static?synchronized?ParseXML?getInstance()?{if(instance?==?null){instance?=?new?ParseXML();}return?instance;}public?C3p0?getC3p0()?{return?c3p0;}}

XMLTest.java:

package?com.xml.parse.file;public?class?XMLTest?{public?static?void?main(String?args[]){ParseXML?xml?=?ParseXML.getInstance();System.out.println("---name---");System.out.println(xml.getC3p0().getName());System.out.println("---driver---");System.out.println(xml.getC3p0().getDriver());System.out.println("---url---");System.out.println(xml.getC3p0().getUrl());System.out.println("---user---");System.out.println(xml.getC3p0().getUser());System.out.println("---password---");System.out.println(xml.getC3p0().getPassword());System.out.println("---initPoolSize---");System.out.println(xml.getC3p0().getInitPoolSize());System.out.println("---minPoolSize---");System.out.println(xml.getC3p0().getMinPoolSize());System.out.println("---maxPoolSize---");System.out.println(xml.getC3p0().getMaxPoolSize());System.out.println("---maxStatements---");System.out.println(xml.getC3p0().getMaxStatements());System.out.println("---maxIdleTime---");System.out.println(xml.getC3p0().getMaxIdleTime());System.out.println("---acquireIncrement---");System.out.println(xml.getC3p0().getAcquireIncrement());System.out.println("---checkoutTimeout---");System.out.println(xml.getC3p0().getCheckoutTimeout());} }

運行XMLTest.java中的main方法。結果如下：

好，到此使用dom4j解析XML文件完畢，請大家指正！

轉載于:https://my.oschina.net/douxn/blog/425060

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