参考了springside的代码实现了高亮，其实也是很简单的。在原来的searchController里面用的是默认的CompassSearchHelper来搜索的。
1 if (searchHelper == null) {
2 searchHelper = new CompassSearchHelper(getCompass(), getPageSize());
3 }
4 CompassSearchCommand searchCommand = new CompassSearchCommand();
5 searchCommand.setPage(new Integer(currentPage-1));
6 searchCommand.setQuery(query);
7 ModelAndView mv = new ModelAndView();
8 mv.addObject("query", query);
9 mv.addObject("p", currentPage);
10 List<String> errors = new ArrayList<String>();
11 try{
12 CompassSearchResults searchResults = searchHelper.search(searchCommand);
13 mv.addObject(getSearchResultsName(), searchResults);
14 }catch (SearchEngineQueryParseException ex){
15 errors.add(TextUtil.escapeHTML(ex.getMessage()));
16 mv.addObject("errors", errors);
17 }
18
本来打算按照springside里面的封装方法。
http://svn.javascud.org/svn/springside/springside2/trunk/core/src/java/org/springside/components/compass/
这里有两个类AdvancedSearchCommand.java,CompassSearchService.java，CompassSearchService里面实现了高亮和排序，后来发现CompassSearchService和CompassSearchHelper长得很像，而且CompassSearchHelper也提供了两个抽象的方法给用户提供一个添加功能的机会。
1 /**
2 * An option to perform any type of processing before the hits are detached.
3 */
4 protected void doProcessBeforeDetach(CompassSearchCommand searchCommand, CompassSession session, CompassHits hits,
5 int from, int size) {
6
7 }
8
9 /**
10 * An option to perform any type of processing after the hits are detached.
11 */
12 protected void doProcessAfterDetach(CompassSearchCommand searchCommand, CompassSession session,
13 CompassDetachedHits hits) {
14
15 }
16
所以我们只要实现一个自己的CompassSearchHelper覆盖这两个方法就可以达到实现高亮的目的了。
1 /**
2 * @author <a href="mailto:rory.cn@gmail.com">somebody</a>
3 * @since Aug 23, 2007 2:04:19 PM
4 * @version $Id AdvanceCompassSearchHelper.java$
5 */
6 public class AdvanceCompassSearchHelper extends CompassSearchHelper {
7
8 private String[] highlightFields;
9
10 public String[] getHighlightFields() {
11 return highlightFields;
12 }
13
14 public void setHighlightFields(String[] highlightFields) {
15 this.highlightFields = highlightFields;
16 }
17
18 /**
19 * @param compass
20 */
21 public AdvanceCompassSearchHelper(Compass compass) {
22 super(compass);
23 }
24
25
26 /* (non-Javadoc)
27 * @see org.compass.core.support.search.CompassSearchHelper#doProcessBeforeDetach(org.compass.core.support.search.CompassSearchCommand, org.compass.core.CompassSession, org.compass.core.CompassHits, int, int)
28 */
29 @Override
30 protected void doProcessBeforeDetach(CompassSearchCommand searchCommand,
31 CompassSession session, CompassHits hits, int from, int size) {
32 if (from < 0) {
33 from = 0;
34 size = hits.getLength();
35 }
36
37 if (highlightFields == null) {
38 return;
39 }
40 // highlight fields
41 for (int i = from; i < size; i++) {
42 for (String highlightField : highlightFields) {
43 hits.highlighter(i).fragment(highlightField);
44 }
45 }
46 }
47
ok，这样就可以实现高亮了。修改一下SearchController的配置。
1 <bean id="advanceCompassSearchHelper" class="com.jdkcn.compass.AdvanceCompassSearchHelper">
2 <property name="highlightFields">
3 <list>
4 <value>content</value>
5 </list>
6 </property>
7 <property name="pageSize"><value>10</value></property>
8 <constructor-arg ref="compass"/>
9 </bean>
10
11 <bean id="searchController" class="com.jdkcn.web.SearchController" parent="baseController">
12 <property name="compass"><ref bean="compass"/></property>
13 <property name="searchView"><value>search</value></property>
14 <property name="searchResultsView"><value>search</value></property>
15 <property name="pageSize"><value>10</value></property>
16 <property name="searchHelper"><ref local="advanceCompassSearchHelper"/></property>
17 </bean>
18
还不要忘了修改一下compass settings 修改一下高亮的样式，修改一下高亮的颜色。
1 <bean id="compass" class="org.compass.spring.LocalCompassBean">
2 <property name="resourceDirectoryLocations">
3 <list>
4 <value>classpath:com/jdkcn/compass</value>
5 </list>
6 </property>
7 <property name="connection">
8 <value>/lucene/indexes</value>
9 </property>
10 <property name="compassSettings">
11 <props>
12 <prop key="compass.transaction.factory">
13 org.compass.spring.transaction.SpringSyncTransactionFactory
14 </prop>
15 <prop key="compass.engine.highlighter.default.formatter.simple.pre">
16 <![CDATA[<font color="red"><b>]]>
17 </prop>
18 <prop key="compass.engine.highlighter.default.formatter.simple.post">
19 <![CDATA[</b></font>]]>
20 </prop>
21 </props>
22 </property>
23 <property name="transactionManager">
24 <ref bean="transactionManager" />
25 </property>
26 </bean>
27
ok了，页面上输出一下就能看到最终效果了
${hit.highlightedText['content']?if_exists}
本文转自:http://jdkcn.com/entry/howto-add-highlight-in-compass.html
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说人之短，乃护己之短。夸己之长，乃忌人之长。皆由存心不厚，识量太狭耳。能去此弊，可以进德，可以远怨。
http://www.blogjava.net/szhswl
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posted on 2007-12-12 20:39
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