java paoding_Luncene 之一 ：创建索引(Luncene + paoding)
本文转载于:http://blog.csdn.net/ivanhxy/article/details/5409541
Luncene是什么就不介绍了。
一、先去网上Down下来 paoding-analysis-2.0.4-beta，解压，在lib目录找到lucene-core-2.2.0.jar，lucene-highlighter-2.2.0.jar，commons-logging.jar 这几个Jar包放到项目当中。
二、添加Paoding。 在项目中使用发现，直接添加paoding-analysis.jar会发生异常。所以我们不直接添加这个Jar，而是把Src目录下的所有文件(也就是源代码) copy 都我们项目的Src目录下;
三、把dic(词典)目录也copy 到我们项目的src下，并在Src目录新建一个包data.index,主要是用来存放生成的索引文件;
四、修改 paoding-dic-home.properties 这个属性文件
#values are "system-env" or "this";
#if value is "this" , using the paoding.dic.home as dicHome if configed!
#paoding.dic.home.config-fisrt=system-env
#dictionary home (directory)
#"classpath:xxx" means dictionary home is in classpath.
#e.g "classpath:dic" means dictionaries are in "classes/dic" directory or any other classpath directory
#paoding.dic.home=dic
#seconds for dic modification detection
#paoding.dic.detector.interval=60
paoding.dic.home=classpath:dic // dic 所在目录
paoding.dic.home.config-fisrt=this //应用当前的配置
五、在 package net.paoding.analysis.knife 下找到PaodingMaker类， Ctrl + S + O 定位到
private static void setDicHomeProperties(Properties p) 这个方法，修改
private static void setDicHomeProperties(Properties p) {
String dicHomeAbsultePath = p
.getProperty("paoding.dic.home.absolute.path");
if (dicHomeAbsultePath != null) {
return;
}
// 获取词典安装目录配置：
// 如配置了PAODING_DIC_HOME环境变量，则将其作为字典的安装主目录
// 否则使用属性文件的paoding.dic.home配置
// 但是如果属性文件中强制配置paoding.dic.home.config-first=this，
// 则优先考虑属性文件的paoding.dic.home配置，
// 此时只有当属性文件没有配置paoding.dic.home时才会采用环境变量的配置
String dicHomeBySystemEnv = null;
try {
dicHomeBySystemEnv = getSystemEnv(Constants.ENV_PAODING_DIC_HOME);
} catch (Error e) {
log.warn("System.getenv() is not supported in JDK1.4. ");
}
String dicHome = getProperty(p, Constants.DIC_HOME);
if (dicHomeBySystemEnv != null) {
String first = getProperty(p, Constants.DIC_HOME_CONFIG_FIRST);
if (first != null && first.equalsIgnoreCase("this")) {
if (dicHome == null) {
dicHome = dicHomeBySystemEnv;
}
} else {
dicHome = dicHomeBySystemEnv;
}
}
// 如果环境变量和属性文件都没有配置词典安转目录
// 则尝试在当前目录和类路径下寻找是否有dic目录，
// 若有，则采纳他为paoding.dic.home
// 如果尝试后均失败，则抛出PaodingAnalysisException异常
if (dicHome == null) {
File f = new File("dic");
if (f.exists()) {
dicHome = "dic/";
} else {
URL url = PaodingMaker.class.getClassLoader()
.getResource("dic");
if (url != null) {
dicHome = "classpath:dic/";
}
}
}
if (dicHome == null) {
throw new PaodingAnalysisException(
"please set a system env PAODING_DIC_HOME or Config paoding.dic.home in paoding-dic-home.properties point to the dictionaries!");
}
// 规范化dicHome，并设置到属性文件对象中
dicHome = dicHome.replace('//', '/');
if (!dicHome.endsWith("/")) {
dicHome = dicHome + "/";
}
p.setProperty(Constants.DIC_HOME, dicHome);// writer to the properites
//修改部分
String path="";
try {
path = URLDecoder.decode(getFile(dicHome).getPath(), "utf-8");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// object
// 将dicHome转化为一个系统唯一的绝对路径，记录在属性对象中
File dicHomeFile = getFile(path);
//修改部分结束
if (!dicHomeFile.exists()) {
throw new PaodingAnalysisException(
"not found the dic home dirctory! "
+ dicHomeFile.getAbsolutePath());
}
if (!dicHomeFile.isDirectory()) {
throw new PaodingAnalysisException(
"dic home should not be a file, but a directory!");
}
p.setProperty("paoding.dic.home.absolute.path", dicHomeFile
.getAbsolutePath());
}
六、创建一个Servlet：AnalyzerServlet
package com.lunceneTest.servlet;
import java.io.IOException;
import java.net.URLDecoder;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.paoding.analysis.analyzer.PaodingAnalyzer;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.store.FSDirectory;
import com.lunceneTest.Model.News;
import com.lunceneTest.db.NewsDao;
public class AnalyzerServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = -822638045647816348L;
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try
{
this.createIndex();
} catch (Exception e)
{
e.printStackTrace();
}
}
public void createIndex() throws Exception
{
//实例化分词器，使用中文分词器
Analyzer analyzer =new PaodingAnalyzer();
String path = URLDecoder.decode(AnalyzerServlet.class.getResource("/data/index").toString(),"UTF-8").replace("file:/","");
System.out.println(path);
FSDirectory directory = FSDirectory.getDirectory(path);
// true表示覆盖原来已经创建的索引,如果是false表示不覆盖，而是继续添加索引
IndexWriter writer = new IndexWriter(directory,analyzer,true);
List list = NewsDao.getAllNews(); // Dao层获取数据库新闻列表的方法
for (News news : list) {
Document doc = new Document();
//Field.Index.UN_TOKENIZED 不分词
Field id_filed = new Field(News.ID,String.valueOf(news.getId()),Field.Store.YES,Field.Index.UN_TOKENIZED);
Field title_field = new Field(News.TITLE,news.getTitle(),Field.Store.YES,Field.Index.TOKENIZED);
Field content_field = new Field(News.CONTENT,news.getContent(),Field.Store.YES,Field.Index.TOKENIZED);
doc.add(id_filed);
doc.add(title_field);
doc.add(content_field);
writer.addDocument(doc);
}
writer.optimize();
writer.close();
}
}
到这里就基本完成了，运行后会发现data.index这个目录下多了很多文件