采用apache的commons.digester包对XML文件进行简单映射解析！

用Xstream也可以实现类似的功能，但XStream对标签属性的解析比较麻烦，用apache的commons.digester就方便多了，举例如下：

用之前要先包含如下几个包：

                commons-digester.jar

     要解析的xml文件如下（server.xml）：

<?xml version="1.0" encoding="gb2312"?><config>               <database-server supply="MYSQL" driver="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost:3306/aws?characterEncoding=gb2312" username="root" password="password" debug="on" />                <diy diy.parameter1="" diy.parameter2="22" diy.parameter3="" diy.parameter4="" diy.parameter5="" diy.parameter6="" diy.parameter7="" diy.parameter8="" />                <optimize max.client="500" thread.overtime="1200000" database.max.session="200000" database.pool.init="5" database.pool.max.workload="30000" />                <log runtime.server="on" runtime.filename="../logs/access.log" error.filename="../logs/error.log" />                <plus-httpd supply="jboss" server.root="../webserver/webapps/portal/" security.code="AH{%C1%F5%BD%F0%D6%F9}" /></config>

解析代码：

        File localFile = new File("system.xml");        Digester localDigester;        (localDigester = new Digester()).setValidating(false);        localDigester.addObjectCreate("config", AWFConfig.class);        localDigester.addObjectCreate("config/database-server", DataBaseServerConf.class);        localDigester.addSetProperties("config/database-server", "supply", "supply");        localDigester.addSetProperties("config/database-server", "driver", "driver");        localDigester.addSetProperties("config/database-server", "url", "url");        localDigester.addSetProperties("config/database-server", "username", "userName");        localDigester.addSetProperties("config/database-server", "password", "password");        localDigester.addSetProperties("config/database-server", "debug", "debug");        localDigester.addSetNext("config/database-server", "setDataBaseServerConf");        localDigester.addObjectCreate("config/schedule", ScheduleConf.class);        localDigester.addSetProperties("config/schedule", "task.cost", "taskCost");        localDigester.addSetProperties("config/schedule", "plan.service", "planService");        localDigester.addSetNext("config/schedule", "setScheduleConf");        localDigester.addObjectCreate("config/diy", DIYConf.class);        localDigester.addSetProperties("config/diy", "diy.parameter1", "diyParameter1");        localDigester.addSetProperties("config/diy", "diy.parameter2", "diyParameter2");        localDigester.addSetProperties("config/diy", "diy.parameter3", "diyParameter3");        localDigester.addSetProperties("config/diy", "diy.parameter4", "diyParameter4");        localDigester.addSetProperties("config/diy", "diy.parameter5", "diyParameter5");        localDigester.addSetProperties("config/diy", "diy.parameter6", "diyParameter6");        localDigester.addSetProperties("config/diy", "diy.parameter7", "diyParameter7");        localDigester.addSetProperties("config/diy", "diy.parameter8", "diyParameter8");        localDigester.addSetNext("config/diy", "setDIYConf");        localDigester.addObjectCreate("config/optimize", OptimizeConf.class);        localDigester.addSetProperties("config/optimize", "max.client", "maxClient");        localDigester.addSetProperties("config/optimize", "thread.overtime", "threadOvertime");        localDigester.addSetProperties("config/optimize", "database.max.session", "maxSession");        localDigester.addSetProperties("config/optimize", "database.pool.init", "databasePoolInit");        localDigester.addSetProperties("config/optimize", "database.pool.max.workload", "databasePoolMaxWorkload");        localDigester.addSetNext("config/optimize", "setOptimizeConf");        localDigester.addObjectCreate("config/log", LogConf.class);        localDigester.addSetProperties("config/log", "runtime.server", "runtimeServer");        localDigester.addSetNext("config/log", "setLogConf");        localDigester.addObjectCreate("config/plus-httpd", HttpDConf.class);        localDigester.addSetProperties("config/plus-httpd", "supply", "supply");        localDigester.addSetProperties("config/plus-httpd", "server.root", "serverRoot");        localDigester.addSetProperties("config/plus-httpd", "security.code", "securityCode");        localDigester.addSetNext("config/plus-httpd", "setHttpDConf");        try {            return (AWFConfig) localDigester.parse(new FileInputStream(localFile));        } catch (SAXException localSAXException) {            throw new ConfigParserException(localSAXException.toString());        } catch (IOException localIOException) {            throw new ConfigParserException(localIOException.toString());        }

映射类AWFConfig:

public class AWFConfig extends Config {    public static AWFServerConf _awfServerConf;    public static DataBaseServerConf _databaseServerConf;    public static OptimizeConf _optimizeConf;    public static LogConf _logConf;    public static ScheduleConf _scheduleConf;    public static HttpDConf _httpdConf;    public static DIYConf _diyConf;    private AWFServerConf awfServerConf;    private DataBaseServerConf dataBaseServerConf;    private OptimizeConf optimizeConf;    private LogConf logConf;    private ScheduleConf scheduleConf;    private DIYConf diyConf;    private HttpDConf httpDConf;    public AWFServerConf getAWFServerConf() {        return this.awfServerConf;    }    public DIYConf getDIYConf() {        return this.diyConf;    }    public DataBaseServerConf getDataBaseServerConf() {        return this.dataBaseServerConf;    }    public HttpDConf getHttpDConf() {        return this.httpDConf;    }    public LogConf getLogConf() {        return this.logConf;    }    public OptimizeConf getOptimizeConf() {        return this.optimizeConf;    }    public ScheduleConf getScheduleConf() {        return this.scheduleConf;    }    public void setAWFServerConf(AWFServerConf paramAWFServerConf) {        this.awfServerConf = paramAWFServerConf;    }    public void setDIYConf(DIYConf paramDIYConf) {        this.diyConf = paramDIYConf;    }    public void setDataBaseServerConf(DataBaseServerConf paramDataBaseServerConf) {        this.dataBaseServerConf = paramDataBaseServerConf;    }    public void setHttpDConf(HttpDConf paramHttpDConf) {        this.httpDConf = paramHttpDConf;    }    public void setLogConf(LogConf paramLogConf) {        this.logConf = paramLogConf;    }    public void setOptimizeConf(OptimizeConf paramOptimizeConf) {        this.optimizeConf = paramOptimizeConf;    }    public void setScheduleConf(ScheduleConf paramScheduleConf) {        this.scheduleConf = paramScheduleConf;    }}