Compass 入门指南

原文地址：http://chuanliang2007.spaces.live.com/blog/cns!E5B7AB2851A4C9D2!389.entry

     在新架构中打算选择Compass或Hibernate Search作为搜索引擎框架，比较后，感觉Hibernate Search上还是没有Compass成熟，另外考虑到后期对网页的爬取及搜索需求，决定还是基于Compass来作为架构缺省的搜索引擎。网上关于Compass的文档很多，但说得相对完整其详细的入门文档基本上没有，Compass的官方文档倒是说得很详细，但是例子一塌糊涂，存在很大问题。记录一下搭建的过程，作为入门的指南。

    Compass 通过OSEM(Object/Search Engine Mapping)允许把应用对象的领域模型映射到搜索引擎，最终通过访问common meta data来达到访问对象的目的。

1、几个核心概念
1.1、annotation vs. xml配置文件

   Compass的配置文件主要分成三类：

    第一类：*.cmd.xml文件*

      .cmd.xml文件是对common meta data进行定义，定义了最终搜索的结果中的最基本的元数据。

    第二类：*.cpm.xml文件

      *.cpm.xml是Object/Search Engine Mapping,提供了POJO到common meta data的映射。

    第三类：*.cfg.xml文件

      Compass的*.cfg.xml定义了Compass的Index存放路径、搜索引擎分词等相关信息。

    与采用xml配置文件相比较，采用Annonation方式还是相对简单，尤其是采用Spring时候，不用写*.cmd.xml文件、*.cpm.xml、*.cfg.xml，相对很方便，而且不像Hibernate的Annonation很多，Compass的Annonation的核心标注只有@Searchable、@SearchableId、@SearchableProperty、@SearchableComponent几个，很容易记忆。因此推荐使用Annonation方式

１.2、Compass核心API
Compass的核心API借鉴了Hibernate的术语，因此在操作上基本上与Hibernate类似，以下为Compass的几个核心接口：

    CompassConfiguration(类似Hibernate Configuration)：用来在一些设置参数、配置文件和映射定义上配置Compass。通常用来创建Compass接口。
    Compass(类似Hibernate SessionFactory)：为单线程使用，创建线程安全的实例来打开Compass Seesion。同样还提供了一些搜索引擎索引级别的操作。
    CompassSesssion(类似Hibernate Session)：用来执行像保存、删除、查找、装载这样的搜索操作。很轻量但是并不是线程安全的。
    CompassTransaction(类似Hibernate Transaction)：管理Compass事务的接口。使用它并不需要事务管理环境（像Spring、JTA）。

1.3、Compass与Spring集成

Compass已经对对spring集成做了很好的封装，同时与Spring对Hibernate的支持类似，Compass也提供了CompassTemplate来简化诸如对Session、Transaction、Exception等操作，尽量充分使用此工具，可以有效提高效率。例如：

CompassTemplate ct = (CompassTemplate) context.getBean("compassTemplate");

Article article = new Article();
article.setTitle("Compass Test");
article.setPublishDate(new Date());
article.setAuthor(1);

ct.save(article); //存储对象需要索引的数据到Compass的索引中。

2、软件环境
Spring ：2.5

Compas：1.2.1

Hibernate：3.2.5

Mysql ：5.0.5

3、数据库脚本
CREATE TABLE `article` (

`Id` int(11) NOT NULL auto_increment,

`title` varchar(40) NOT NULL default '',

`author` int(11) default '0',

`publish_date` date NOT NULL default '0000-00-00',

PRIMARY KEY (`Id`) ) TYPE=MyISAM;

CREATE TABLE `author` (

`Id` int(11) NOT NULL auto_increment,

`username` varchar(20) NOT NULL default '',

`password` varchar(20) NOT NULL default '',

`age` smallint(6) default '0',

PRIMARY KEY (`Id`) ) TYPE=MyISAM;

4、测试用例
从测试用例讲起比较容易把关系理清楚，不然一堆术语和概念很让人晕乎。

import org.apache.log4j.Logger;
import java.util.Date;

import junit.framework.TestCase;

import org.compass.core.Compass;
import org.compass.core.CompassDetachedHits;
import org.compass.core.CompassHit;
import org.compass.core.CompassHits;
import org.compass.core.CompassSession;
import org.compass.core.CompassTemplate;
import org.compass.core.CompassTransaction;
import org.compass.core.support.search.CompassSearchCommand;
import org.compass.core.support.search.CompassSearchResults;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.mobilesoft.esales.dao.hibernate.ArticleDAO;
import com.mobilesoft.esales.dao.hibernate.AuthorDAO;
import com.mobilesoft.esales.model.Article;
import com.mobilesoft.esales.model.Author;
import com.mobilesoft.framework.search.service.CompassSearchService;

/**
 * Compass服务使用的测试用例
 * 
 * @author [e-mail]
 * 
 */

public class TestCompass extends TestCase {

    private static final Logger logger = Logger.getLogger(TestCompass.class);

    private static ClassPathXmlApplicationContext context = null;
    private static CompassTemplate ct;

    static {
        context = new ClassPathXmlApplicationContext(new String[] {
                "applicationContext.xml", "applicationContext-resources.xml",
                "applicationContext-dao.xml", "applicationContext-service.xml",
                "applicationContext-compass.xml" });
        ct = (CompassTemplate) context.getBean("compassTemplate");
    }

    protected void setUp() throws Exception {

    }

    /**
     * 插入测试数据
     */
    public void testInsert() {

        ArticleDAO articleDao = (ArticleDAO) context.getBean("articleDAO");
        AuthorDAO authorDao = (AuthorDAO) context.getBean("authorDAO");
        Article article = new Article();
        Author author = new Author();
        author.setAge((short) 27);
        author.setUsername("liangchuan");
        author.setPassword("liangchuan");
        article.setTitle("Compass Test");
        article.setPublishDate(new Date());
        article.setAuthor(1);
        authorDao.save(author);
        articleDao.save(article);
        ct.save(article);
        ct.save(author);
    }

    /**
     * 用于测试使用CompassTransaction事务方式
     */
    public void testTransactionalFind() {

        Compass compass = ct.getCompass();
        CompassSession session = compass.openSession();
        CompassTransaction tx = null;
        try {
            tx = session.beginTransaction();
            CompassHits hits = session.find("Compass*");

            logger.error("testTransactionalFind() - CompassHits hits="
                    + hits.getLength());
            for (int i = 0; i < hits.getLength(); i++) {
                Object hit = hits.data(i);
                if (hit instanceof Article) {
                    Article item = (Article) hit;
                    logger.error("testTransactionalFind() - article     hits="
                            + item.getTitle());
                } else if (hit instanceof Author) {
                    Author item = (Author) hit;
                    logger.error("testTransactionalFind() - author hits="
                            + item.getUsername());
                } else {
                    logger.error("testTransactionalFind() - error hits=");
                }
            }
            tx.commit();
        } catch (Exception e) {
            if (tx != null) {
                tx.rollback();
            }
        } finally {
            session.close();
        }
    }

    /**
     * 用于演示CompassDetachedHits的使用。
     * 由于CompassTempalte得到的结果集必须在transactionalcontext中才能使用，
     * 因此必须使用CompassDetachedHits方式测试CompassDetachedHits方式
     */
    public void testDetachedFind() {

        // 由于CompassTempalte得到的结果集必须在transactional
        // context中才能使用，因此必须使用CompassDetachedHits方式
        // 测试CompassDetachedHits方式
        CompassDetachedHits hits = ct.findWithDetach("Compass*");

        logger.error("testDetachedFind() - CompassHits hits="
                + hits.getLength());
        for (int i = 0; i < hits.getLength(); i++) {
            Object hit = hits.data(i);
            if (hit instanceof Article) {
                Article item = (Article) hit;
                logger.error("testDetachedFind() - article     hits="
                        + item.getTitle());
            } else if (hit instanceof Author) {
                Author item = (Author) hit;
                logger.error("testDetachedFind() - author hits="
                        + item.getUsername());
            } else {
                logger.error("testDetachedFind() - error hits=");
            }
        }

    }

    /**
     * 用于演示com.mobilesoft.framework.search.service.CompassSearchService的使用
     * 
     */
    class CompassSearch extends CompassSearchService{
        CompassSearch(){
            Compass compass = ct.getCompass();
            CompassSession session = compass.openSession();
            CompassTransaction tx = null;

            try {
                tx = session.beginTransaction();
                CompassSearchCommand command = new CompassSearchCommand();
                command.setQuery("Compass");
                CompassSearchResults results= performSearch(command,session);
                logger.error("CompassSearch() - CompassHit TotalHits value=" +results.getTotalHits());

                for (int i = 0; i < results.getHits().length; i++) {
                    CompassHit hits=results.getHits()[i];
                    Object hit=hits.getData();
                    logger.error("CompassSearch() - CompassHit hit=" + hit); //$NON-NLS-1$

                    if (hit instanceof Article) {
                        Article item = (Article) hit;
                        logger.error("testCompassSearchService() - article     hits="
                                + item.getTitle());
                    } else if (hit instanceof Author) {
                        Author item = (Author) hit;
                        logger.error("testCompassSearchService() - author hits="
                                + item.getUsername());
                    } else {
                        logger.error("testCompassSearchService() - error hits=");
                    }
                    
                    tx.commit();
                }
            } catch (Exception e) {
                if (tx != null) {
                    tx.rollback();
                }
            } finally {
                session.close();
            }        
                    
        }
        
    }
    public void testCompassSearchService() {
        new CompassSearch();
        }

    protected void tearDown() throws Exception {
    }
}

5、配置文件
applicationContext-compass.xml：

<?xml version="1.0"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
    "http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans default-lazy-init="true">
    <bean id="compassTemplate" class="org.compass.core.CompassTemplate">
        <property name="compass" ref="compass"/>
    </bean>
    <bean id="annotationConfiguration"
        class="org.compass.annotations.config.CompassAnnotationsConfiguration">
    </bean>
    <bean id="compass" class="org.compass.spring.LocalCompassBean">
        <property name="classMappings">
            <list>
                <value>com.mobilesoft.esales.model.Article</value>
                <value>com.mobilesoft.esales.model.Author</value>
            </list>
        </property>
        <property name="compassConfiguration" ref="annotationConfiguration"/>
        
        <property name="compassSettings">
            <props>
                <prop key="compass.engine.connection"> file://compass </prop>
                <prop key="compass.transaction.factory">
                    org.compass.spring.transaction.SpringSyncTransactionFactory
                    </prop>
                <prop
                    key="compass.engine.highlighter.default.formatter.simple.pre">
                    <![CDATA[<font color="red"><b>]]>
                </prop>
                <prop
                    key="compass.engine.highlighter.default.formatter.simple.post">
                    <![CDATA[</b></font>]]>
                </prop>
            </props>
        </property>
        
        <property name="transactionManager" ref="transactionManager"/>
    </bean>
    
    <bean id="hibernateGpsDevice"
        class="org.compass.gps.device.hibernate.HibernateGpsDevice">
        <property name="name">
            <value>hibernateDevice</value>
        </property>
        <property name="sessionFactory" ref="sessionFactory"/>
        <property name="mirrorDataChanges">
            <value>true</value>
        </property>
    </bean>
    <bean id="compassGps" class="org.compass.gps.impl.SingleCompassGps"
        init-method="start" destroy-method="stop">
        <property name="compass" ref="compass"/>
        <property name="gpsDevices">
            <list>
                <bean
                    class="org.compass.spring.device.SpringSyncTransactionGpsDeviceWrapper">
                    <property name="gpsDevice" ref="hibernateGpsDevice"/>
                </bean>
            </list>
        </property>
    </bean>
    <bean id="compassSearchService" class="com.mobilesoft.framework.search.service.CompassSearchService">
        <property name="compass" ref="compass"/>
        <property name="pageSize" value="15"/>
    </bean>

    <!-- 定时重建索引(利用quartz)或随Spring ApplicationContext启动而重建索引 -->
    <bean id="compassIndexBuilder" class="com.mobilesoft.framework.search.service.CompassIndexBuilder" lazy-init="false">
        <property name="compassGps" ref="compassGps"/>
        <property name="buildIndex" value="false"/>
        <property name="lazyTime" value="10"/>
    </bean>
    
    
</beans>

applicationContext-dao.xml、applicationContext-service.xml、applicationContext-resources.xml等略去。

6、Service层(参考了SpringSide实现)
AdvancedSearchCommand.java：

package com.mobilesoft.framework.search.service;

import java.util.HashSet;
import java.util.Set;

import org.apache.commons.lang.StringUtils;
import org.compass.core.CompassQuery.SortDirection;
import org.compass.core.CompassQuery.SortPropertyType;
import org.compass.core.support.search.CompassSearchCommand;

import org.springframework.util.Assert;

public class AdvancedSearchCommand extends CompassSearchCommand {

    /**
     * 封装基于Compass 的排序参数.
     */
    class CompassSort {

        private String name;

        private SortPropertyType type;

        private SortDirection direction;

        public CompassSort() {
        }

        public CompassSort(String sortParamName, String paramType,
                           boolean isAscend) {
            Assert.isTrue(StringUtils.isNotBlank(sortParamName));
            setName(sortParamName);

            if ("int".equalsIgnoreCase(paramType)) {
                setType(SortPropertyType.INT);
            } else if ("float".equalsIgnoreCase(paramType)) {
                setType(SortPropertyType.FLOAT);
            } else if ("string".equalsIgnoreCase(paramType)) {
                setType(SortPropertyType.STRING);
            } else {
                setType(SortPropertyType.AUTO);
            }

            if (isAscend) {
                setDirection(SortDirection.AUTO);
            } else {
                setDirection(SortDirection.REVERSE);
            }
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public SortPropertyType getType() {
            return type;
        }

        public void setType(SortPropertyType type) {
            this.type = type;
        }

        public SortDirection getDirection() {
            return direction;
        }

        public void setDirection(SortDirection direction) {
            this.direction = direction;
        }
    }

    /**
     * 搜索结果排序表.
     */
    private Set<CompassSort> sortMap = new HashSet<CompassSort>();

    private String[] highlightFields;

    /**
     * @param paramType 现定义了三种类型： int string 以及 float。<br>
     *                  除去这三种外，其他会被自动定义为SortPropertyType.AUTO 具体的可见{@link org.compass.core.CompassQuery.SortPropertyType}
     * @param isAscend  顺序还是倒序排序
     * @see org.compass.core.CompassQuery.SortPropertyType#AUTO
     * @see org.compass.core.CompassQuery.SortPropertyType#INT
     * @see org.compass.core.CompassQuery.SortPropertyType#STRING
     * @see org.compass.core.CompassQuery.SortPropertyType#FLOAT
     * @see org.compass.core.CompassQuery.SortDirection#AUTO
     * @see org.compass.core.CompassQuery.SortDirection#REVERSE
     */
    public void addSort(String sortParamName, String paramType, boolean isAscend) {
        this.sortMap.add(new CompassSort(sortParamName, paramType, isAscend));
    }

    public Set<CompassSort> getSortMap() {
        return sortMap;
    }

    public void setSortMap(Set<CompassSort> sortMap) {
        this.sortMap = sortMap;
    }

    public String[] getHighlightFields() {
        return highlightFields;
    }

    public void setHighlightFields(String[] highlightFields) {
        this.highlightFields = highlightFields;
    }
}

CompassIndexBuilder.java：

package com.mobilesoft.framework.search.service;

import org.apache.log4j.Logger;
import org.compass.gps.CompassGps;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;

/**
 * 通过quartz定时调度定时重建索引或自动随Spring ApplicationContext启动而重建索引的Builder.
 * 会启动后延时数秒新开线程调用compassGps.index()函数.
 * 默认会在Web应用每次启动时重建索引,可以设置buildIndex属性为false来禁止此功能.
 * 也可以不用本Builder, 编写手动调用compassGps.index()的代码.
 *
 */
public class CompassIndexBuilder implements InitializingBean {

    private static final Logger log = Logger.getLogger(CompassIndexBuilder.class);

    // 是否需要建立索引，可被设置为false使本Builder失效.
    private boolean buildIndex = false;

    // 索引操作线程延时启动的时间，单位为秒
    private int lazyTime = 10;

    // Compass封装
    private CompassGps compassGps;

    // 索引线程
    private Thread indexThread = new Thread() {

        @Override
        public void run() {
            try {
                Thread.sleep(lazyTime * 1000);

                log.info("begin compass index...");
                long beginTime = System.currentTimeMillis();
                // 重建索引.
                // 如果compass实体中定义的索引文件已存在，索引过程中会建立临时索引，
                // 索引完成后再进行覆盖.
                compassGps.index();
                long costTime = System.currentTimeMillis() - beginTime;
                log.info("compss index finished.");
                log.info("costed " + costTime + " milliseconds");
            } catch (InterruptedException e) {
                // simply proceed
            }
        }
    };

    /**
     * 实现<code>InitializingBean</code>接口，在完成注入后调用启动索引线程.
     *
     * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
     */
    public void afterPropertiesSet() throws Exception {
        if (buildIndex) {
            Assert.notNull(compassGps, "CompassIndexBuilder not set CompassGps yet.");
            indexThread.setDaemon(true);
            indexThread.setName("Compass Indexer");
            indexThread.start();
        }
    }

    public void setBuildIndex(boolean buildIndex) {
        this.buildIndex = buildIndex;
    }

    public void setLazyTime(int lazyTime) {
        this.lazyTime = lazyTime;
    }

    public void setCompassGps(CompassGps compassGps) {
        this.compassGps = compassGps;
    }
}

CompassSearchService.java：

package com.mobilesoft.framework.search.service;

import org.compass.core.Compass;
import org.compass.core.CompassCallback;
import org.compass.core.CompassDetachedHits;
import org.compass.core.CompassHits;
import org.compass.core.CompassQuery;
import org.compass.core.CompassSession;
import org.compass.core.CompassTemplate;
import org.compass.core.CompassTransaction;
import org.compass.core.support.search.CompassSearchCommand;
import org.compass.core.support.search.CompassSearchResults;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;

import com.mobilesoft.framework.search.service.AdvancedSearchCommand.CompassSort;
/**
 * 仿照 {@link org.compass.spring.web.mvc.CompassSearchController}
 * 中的代码，构建了一个Service，方便不使用Spring MVC 
 *
 * @see org.compass.spring.web.mvc.CompassSearchController
 * @see org.compass.spring.web.mvc.AbstractCompassCommandController
 */
public class CompassSearchService implements InitializingBean {

    //每页显示的条目数量
    private Integer pageSize = 15;

    private Compass compass;

    private CompassTemplate compassTemplate;

    /**
     * 公开的搜索接口，返回匹配的搜索结果，与
     * {@link org.compass.spring.web.mvc.CompassSearchController#handle(javax.servlet.http.HttpServletRequest,
     *javax.servlet.http.HttpServletResponse,Object,org.springframework.validation.BindException) 处理相似
     *
     * @see org.compass.spring.web.mvc.CompassSearchController#handle(javax.servlet.http.HttpServletRequest,
     *javax.servlet.http.HttpServletResponse,java.lang.Object,org.springframework.validation.BindException)
     */
    public CompassSearchResults search(final CompassSearchCommand command) {
        return (CompassSearchResults) getCompassTemplate().execute(
                CompassTransaction.TransactionIsolation.READ_ONLY_READ_COMMITTED, new CompassCallback() {
            public Object doInCompass(CompassSession session) {
                return performSearch(command, session);
            }
        });
    }

    /**
     * 通过此方法调用搜索引擎,进行结果匹配搜索.
     *
     * @see org.compass.spring.web.mvc.CompassSearchController#performSearch(
     *org.compass.spring.web.mvc.CompassSearchCommand,org.compass.core.CompassSession)
     */
    protected CompassSearchResults performSearch(CompassSearchCommand searchCommand, CompassSession session) {
        long time = System.currentTimeMillis();
        CompassQuery query = buildQuery(searchCommand, session);
        CompassHits hits = query.hits();
        CompassDetachedHits detachedHits;
        CompassSearchResults.Page[] pages = null;
        if (pageSize == null) {
            doProcessBeforeDetach(searchCommand, session, hits, -1, -1);
            detachedHits = hits.detach();
        } else {
            int iPageSize = pageSize;
            int page = 0;
            int hitsLength = hits.getLength();
            if (searchCommand.getPage() != null) {
                page = searchCommand.getPage();
            }
            int from = page * iPageSize;

            if (from > hits.getLength()) {

                // 如果起始的条目大于搜索到的条目
                from = hits.getLength() - iPageSize;
                doProcessBeforeDetach(searchCommand, session, hits, from, hitsLength);
                detachedHits = hits.detach(from, hitsLength);
            } else if ((from + iPageSize) > hitsLength) {

                // 结束的条目大于搜索到的结果
                doProcessBeforeDetach(searchCommand, session, hits, from, hitsLength);
                detachedHits = hits.detach(from, hitsLength);
            } else {

                // 中间的页码，直接取出相应的条目
                doProcessBeforeDetach(searchCommand, session, hits, from, iPageSize);
                detachedHits = hits.detach(from, iPageSize);
            }
            doProcessAfterDetach(searchCommand, session, detachedHits);
            int numberOfPages = (int) Math.ceil((float) hitsLength / iPageSize);
            pages = new CompassSearchResults.Page[numberOfPages];
            for (int i = 0; i < pages.length; i++) {
                pages[i] = new CompassSearchResults.Page();
                pages[i].setFrom(i * iPageSize + 1);
                pages[i].setSize(iPageSize);
                pages[i].setTo((i + 1) * iPageSize);
                if (from >= (pages[i].getFrom() - 1) && from < pages[i].getTo()) {
                    pages[i].setSelected(true);
                } else {
                    pages[i].setSelected(false);
                }
            }
            if (numberOfPages > 0) {
                CompassSearchResults.Page lastPage = pages[numberOfPages - 1];
                if (lastPage.getTo() > hitsLength) {
                    lastPage.setSize(hitsLength - lastPage.getFrom());
                    lastPage.setTo(hitsLength);
                }
            }
        }
        time = System.currentTimeMillis() - time;
        CompassSearchResults searchResults = new CompassSearchResults(detachedHits.getHits(), time, pageSize);
        searchResults.setPages(pages);
        return searchResults;
    }

    /**
     * 构建Lucene搜索器.
     */
    protected CompassQuery buildQuery(CompassSearchCommand searchCommand, CompassSession session) {
        CompassQuery query = session.queryBuilder().queryString(searchCommand.getQuery().trim()).toQuery();

        if (AdvancedSearchCommand.class.isAssignableFrom(searchCommand.getClass())) {
            AdvancedSearchCommand advancedSearchCommand = (AdvancedSearchCommand) searchCommand;

            for (CompassSort sort : advancedSearchCommand.getSortMap()) {
                query.addSort(sort.getName(), sort.getType(), sort.getDirection());
            }
        }
        return query;
    }

    /**
     * 在detach 之前，可以做一些操作。比如highlighting...
     *
     * @param from 需要注意的是，如果pageSize 没有指定，那么这里传入的参数为-1
     */
    protected void doProcessBeforeDetach(CompassSearchCommand searchCommand, CompassSession session, CompassHits hits,
                                         int from, int size) {
        if (AdvancedSearchCommand.class.isAssignableFrom(searchCommand.getClass())) {
            if (from < 0) {
                from = 0;
                size = hits.getLength();
            }
            String[] highlightFields = ((AdvancedSearchCommand) searchCommand).getHighlightFields();

            if (highlightFields == null) {
                return;
            }

            // highlight fields
            for (int i = from; i < size; i++) {
                for (String highlightField : highlightFields) {
                    hits.highlighter(i).fragment(highlightField);
                }
            }
        }
    }

    /**
     * An option to perform any type of processing before the hits are detached.
     */
    protected void doProcessAfterDetach(CompassSearchCommand searchCommand, CompassSession session,
                                        CompassDetachedHits hits) {

    }

    public void afterPropertiesSet() throws Exception {
        Assert.notNull(compass, "Must set compass property");
        this.compassTemplate = new CompassTemplate(compass);
    }

    public Integer getPageSize() {
        return pageSize;
    }

    public void setPageSize(Integer pageSize) {
        this.pageSize = pageSize;
    }

    public void setCompass(Compass compass) {
        this.compass = compass;
    }

    protected CompassTemplate getCompassTemplate() {
        return this.compassTemplate;
    }

}

8、Model层

@SearchableId 声明Document的id列；

@SearchableProperty 声明要索引的field；

@SearchableComponent 声明要索引的其他关联对象。

Article.java：

package com.mobilesoft.esales.model;

import java.util.Date;

import org.compass.annotations.Searchable;
import org.compass.annotations.SearchableId;
import org.compass.annotations.SearchableProperty;
import org.compass.core.CompassTemplate;


@Searchable
public class Article  implements java.io.Serializable {

    @SearchableId
    private Integer id;
    @SearchableProperty(name="title")
    private String title;
    @SearchableProperty(name="author")
    private Integer author;
    @SearchableProperty(name="publishDate")
    private Date publishDate;

    /** default constructor */
    public Article() {
    }

    /** minimal constructor */
    public Article(String title, Date publishDate) {
        this.title = title;
        this.publishDate = publishDate;
    }

    /** full constructor */
    public Article(String title, Integer author, Date publishDate) {
        this.title = title;
        this.author = author;
        this.publishDate = publishDate;
    }

    public Integer getId() {
        return this.id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getTitle() {
        return this.title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public Integer getAuthor() {
        return this.author;
    }

    public void setAuthor(Integer author) {
        this.author = author;
    }

    public Date getPublishDate() {
        return this.publishDate;
    }

    public void setPublishDate(Date publishDate) {
        this.publishDate = publishDate;
    }

}

Author.java：

package com.mobilesoft.esales.model;

import org.compass.annotations.Searchable;
import org.compass.annotations.SearchableId;
import org.compass.annotations.SearchableProperty;
import org.compass.core.CompassTemplate;


@Searchable
public class Author  implements java.io.Serializable {


    @SearchableId
    private Integer id;
    @SearchableProperty(name="username")
    private String username;
    private String password;
    @SearchableProperty(name="age")
    private Short age;

    public Author() {
    }

    /** minimal constructor */
    public Author(String username, String password) {
        this.username = username;
        this.password = password;
    }

    /** full constructor */
    public Author(String username, String password, Short age) {
        this.username = username;
        this.password = password;
        this.age = age;
    }

    // Property accessors

    public Integer getId() {
        return this.id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return this.username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return this.password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Short getAge() {
        return this.age;
    }

    public void setAge(Short age) {
        this.age = age;
    }


}

9、DAO层
ArticleDAO.java和AuthorDAO.java省略

直接用MyEclipse生成的，没有什么特别的。
Compass - Java Search Engine Framework -- Reference Documentation
http://www.compass-project.org/docs/1.2.1/reference/html/

The Compass Framework Search made easy.pdf:
http://www.nljug.org/pages/events/content/jfall_2006/sessions/00015/slides/

InfoQ:  Compass: Integrate Search into your apps:
http://www.infoq.com/articles/compass-search-tutorial
http://www.infoq.com/news/compass-11
http://www.infoq.com/cn/articles/compass-search-tutorial

Compass 指南：
http://wiki.springside.org.cn/display/springside/Compass

kimchy：
http://www.kimchy.org/