Lucene 全文检索实践

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Lucene全文检索技术

全文检索 lucene Java Apache HTML

/**
 * PHPDocIndexer.java
 * 用于对 PHPDoc 的 HTML 页面生成索引文件。
 */
import java.io.File;
import java.io.FileReader;
import java.io.BufferedReader;
import java.io.IOException;
import java.util.Date;
import java.text.DateFormat;
import java.lang.*;

import org.apache.lucene.analysis.cjk.CJKAnalyzer;

import org.apache.lucene.index.IndexWriter;

import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.DateField;

class PHPDocIndexer
{
    public static void main(String[] args) throws ClassNotFoundException, IOException
    {
        try {
            Date start = new Date();
            IndexWriter writer = new IndexWriter("/home/nio/indexes-phpdoc", new CJKAnalyzer(), true); //索引保存目录，必须存在
            indexDocs(writer, new File("/home/nio/phpdoc-zh")); //HTML 文件保存目录
            
            System.out.println("Optimizing ....");
            writer.optimize();
            writer.close();
           
            Date end = new Date();

            System.out.print("Total time: ");
            System.out.println(end.getTime() - start.getTime());
        } catch (Exception e) {
            System.out.println("Class " + e.getClass() + " throws error!\n  errmsg: " + e.getMessage());
        }   //end try
    }   //end main

    public static void indexDocs(IndexWriter writer, File file) throws Exception 
    {
        if (file.isDirectory()) {
            String[] files = file.list();
            for (int i = 0; i < files.length; i++) {
                indexDocs(writer, new File(file, files[i]));
            }   //end for
        } else if (file.getPath().endsWith(".html")) {  //只对 HTML 文件做索引           
            System.out.print("Add file:" + file + " ....");
            // Add html file ....
            Document doc = new Document();
            doc.add(Field.UnIndexed("file", file.getName()));    //索引文件名
            doc.add(Field.UnIndexed("modified", DateFormat.getDateTimeInstance().format(new Date(file.lastModified()))));   //索引最后修改时间

              String title = "";
            String content = "";
            String status = "start";
          
            FileReader fReader = new FileReader(file);
            BufferedReader bReader = new BufferedReader(fReader);
            String line = bReader.readLine();

            while (line != null) {                
                content += line;
                //截取 HTML 标题 <title>
                if ("start" == status && line.equalsIgnoreCase("><TITLE")) {
                    status = "match";
                } else if ("match" == status) {
                    title = line.substring(1, line.length() - 7);
                    doc.add(Field.Text("title", title));    //索引标题
                    status = "end";
                }   //end if
                line = bReader.readLine();
            }   //end while
            bReader.close();
            fReader.close();
            doc.add(Field.Text("content", content.replaceAll("<[^<>]+>", "")));  //索引内容
            writer.addDocument(doc);
            System.out.println(" [OK]");
        }   //end if
    }
}   //end class

索引生成完之后，就需要一个检索页面，下边是搜索页面（search.jsp）的代码：

<%@ page language="java" import="javax.servlet.*, javax.servlet.http.*, java.io.*, java.util.Date, java.util.ArrayList, java.util.regex.*, org.apache.lucene.analysis.*, org.apache.lucene.document.*, org.apache.lucene.index.*, org.apache.lucene.search.*, org.apache.lucene.queryParser.*, org.apache.lucene.analysis.Token, org.apache.lucene.analysis.TokenStream, org.apache.lucene.analysis.cjk.CJKAnalyzer, org.apache.lucene.analysis.cjk.CJKTokenizer, com.chedong.weblucene.search.WebLuceneHighlighter" %>

<%@ page contentType="text/html;charset=GB2312" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
    "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
    <title>PHPDoc - PHP 简体中文手册全文检索</title>
    <base target="main"><!-- 由于使用了 Frame，所以指定 target 到 main 窗口显示 -->
    <style>
        body {background-color: white; margin: 4px}
        body, input, div {font-family: Tahoma; font-size: 9pt}
        body, div {line-height: 18px}
        u {color: red}
        b {color: navy}
        form {padding: 0px; margin: 0px}
        .txt {border: 1px solid black}
        .f {padding: 4px; margin-bottom: 16px; background-color: #E5ECF9; border-top: 1px solid #3366CC; border-bottom: 1px solid #3366CC; text-align: center;}
        .d, .o {padding-left: 16px}
        .d {color: gray}
        .o {color: green}
        .o a {color: #7777CC}
    </style>
    <script language="JavaScript">
        function gotoPage(i)
        {
            document.frm.page.value = i;
            document.frm.submit();
        }   //end function
    </script>
</head>
 
<body>
<%
String keyVal = null;
String pageVal = null;
int offset = 0;
int curPage = 0;
int pages;
final int ROWS = 50;
 
//获取 GET 参数
try {
    byte[] keyValByte = request.getParameter("key").getBytes("ISO8859_1");  //查找关键字
    keyVal = new String(keyValByte);
    pageVal = request.getParameter("page");    //页码
} catch (Exception e) {
    //do nothing;
}
if (keyVal == null)
    keyVal = new String("");
%>
<div class="f">
    <form name="frm" action="./index.jsp" method="GET" onsubmit="this.page.value='0';return true;" target="_self">
        <input type="text" name="key" class="txt" size="40" value="<%=keyVal%>" />
        <input type="hidden" name="page" value="<%=pageVal%>" />
        <input type="submit" value="搜  索" /><br />
        <font color="green">提示：可使用多个关键字（使用空格隔开）提高搜索的准确率。</font>
    </form>
    <script language="JavaScript">
        document.frm.key.focus();
    </script>
</div>
<%
if (keyVal != null && keyVal.length() > 0) {
    try {
        curPage = Integer.parseInt(pageVal);    //将当前页转换成整数
    } catch (Exception e) {
        //do nothing;
    }   //end try
    try {
        Date startTime = new Date();
        keyVal = keyVal.toLowerCase().replaceAll("(or|and)", "").trim().replaceAll("\\s+", " AND ");
        Searcher searcher = new IndexSearcher("/home/nio/indexes-phpdoc"); //索引目录
        Analyzer analyzer = new CJKAnalyzer();
        String[] fields = {"title", "content"};        
        Query query = MultiFieldQueryParser.parse(keyVal, fields, analyzer);
        Hits hits = searcher.search(query);
 
        StringReader in = new StringReader(keyVal);
        TokenStream tokenStream = analyzer.tokenStream("", in);
        ArrayList al = new ArrayList();
        for (Token token = tokenStream.next(); token != null; token = tokenStream.next()) {
            al.add(token.termText());
        }   //end for
        
        //总页数
        pages = (new Integer(hits.length()).doubleValue() % ROWS != 0) ? (hits.length() / ROWS) + 1 : (hits.length() / ROWS);
 
        //当前页码
        if (curPage < 1)
            curPage = 1;
        else if (curPage > pages)
            curPage = pages;
        
        //起始、终止下标
        offset = (curPage - 1) * ROWS;
        int end = Math.min(hits.length(), offset + ROWS);
       
        //循环输出查询结果
        WebLuceneHighlighter hl = new WebLuceneHighlighter(al);
        for (int i = offset; i < end; i++) {
            Document doc = hits.doc(i);
            %>
            <div class="t"><a href="/~nio/phpdoc-zh/<%=doc.get("file")%>"><%=hl.highLight(doc.get("title"))%></a></div>
            <div class="d"><%=hl.highLight(doc.get("content").replaceAll("\n", "  "), 100)%> ……</div>
            <div class="o">
                /~nio/phpdoc-zh/<%=doc.get("file")%>
                 - 
                <%=doc.get("modified")%>
            </div>
            <br />
            <%
        }   //end for
        searcher.close();
        Date endTime = new Date();
        %>
            <div class="f">
                检索总共耗时 <b><%=((endTime.getTime() - startTime.getTime()) / 1000.0)%></b> 秒，约有 <b><%=hits.length()%></b> 项符合条件的记录，共 <b><%=pages%></b> 页
        <%
        if (curPage > 1 && pages > 1) {
        %>
             | <a href="javascript:gotoPage(<%=(curPage-1)%>);" target="_self">上一页</a>
        <%
        }   //end if
        if (curPage < pages && pages > 1) {
        %>
             | <a href="javascript:gotoPage(<%=(curPage+1)%>)" target="_self">下一页</a>
        <%
        }   //end if
    } catch (Exception e) {
    %>
        <!-- <%=e.getClass()%> 导致错误：<%=e.getMessage()%> -->
    <%
    }   //end if
}   //end if
%>    
</body>
</html>

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Lucene 小试牛刀代码实现 | 全文检索lucene学习笔记(四)

2008-07-05 11:10
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