全文檢索一直都是web方面的關鍵技術,如何在浩如煙海的信息中找到自己想要的信息是人們最關心的。鼎鼎大名的GOOGLE就是一個很成功的例子,網絡上的人們大部分都用GOOGLE來查找自己需要的內容。全文檢索主要有兩個技術指標:快速和精確。前一段時間做了一個新聞系統,老板要加上全文檢索的功能,想了很久才用一個不太高明的方法實現了。現在分享一下,希望是拋磚引玉吧,如果大家有更好的辦法請跟在后邊:) <html> <head> <link rel="stylesheet" href="css/style3.css"> <title>新聞搜索</title> <script language="javascript"> function subform() { if (document.zl_form.keyword.value=="") { alert("請輸入關鍵字!"); document.zl_form.keyword.focus(); return false; } return true; } </script> </head> <body bgcolor="#F0F6E2"> <form name="zl_form" target="_new" method="post" action="aftsearch.jsp" onsubmit="return subform()"> <table width="600" bgcolor="#F0F6E2"> <tr> <td colspan="4" height="10"> </td> </tr> <tr> <td width="14%">輸入查詢關鍵字:</td> <td align="left" width="65%"> <input size="50" type="text" name="keyword" style="font-size: 9pt"> <input type="submit" name="submit" value="搜索" style="font-size: 9pt"> </td> </tr> <tr> <td colspan="2" height="9" align="left"> <br> <font color="red" size="+1">說明:如果有多個查詢條件,中間用</font><font size="+2">+</font><font color="red" size="+1">隔開。如:1+2+3+4...</font></td> </tr> [page_break] </table> </form> </body> </html> 下面的代碼是全文檢索主體javabean的代碼:newsSearch.java package NEWS; import java.sql.*; import java.lang.*; import java.text.*; import java.util.*; import java.io.*; import java.util.regex.*; import DBstep.iDBManager2000;//數據庫操作的bean public class newsSearch { private String filePath=null;//主體新聞存放的目錄 private String keyWord=null;//查詢關鍵字 private Vector news = new Vector();//存放符合條件的結果 public newsSearch() { } public void setFilePath(String s) { this.filePath=s; } public void setKeyWord(String s) { this.keyWord=s; } public Vector getResult() { return news; } public void search() { //打開數據庫 ResultSet result=null; String mSql=null; PreparedStatement prestmt=null; DBstep.iDBManager2000 DbaObj=new DBstep.iDBManager2000(); DbaObj.OpenConnection(); try { //檢索所有的新聞 mSql="select * from t_news_detail order by release_time desc"; result=DbaObj.ExecuteQuery(mSql); while(result.next()) { String id=result.getString("id"); String title=result.getString("title"); String release_time=result.getString("release_time"); String news_type=result.getString("type"); String content=result.getString("content"); String man_add=result.getString("man_add"); //按行讀文件 String trace=filePath+content+".html"; FileReader myFileReader=new FileReader(trace); BufferedReader myBufferedReader=new BufferedReader(myFileReader); String myString=null; String resultString=new String(); while((myString=myBufferedReader.readLine())!=null) { resultString=resultString+myString; } //去掉多余字符 HtmlEncode.HtmlEncode Html=new HtmlEncode.HtmlEncode();//這個bean去掉多余的字符,新聞是自己生成的文件,可以盡量多的刪除多余字符 [page_break] resultString=Html.TextEncode(resultString); myFileReader.close(); //取出查詢關鍵字 Pattern p=null; Matcher m=null; p = Pattern.compile("\\+"); String[] a=p.split(keyWord);//把關鍵字用+分開 //全文檢索 String searchResult="1";//檢索結果 int i; for(i=0;i<a.length;i++)//逐個按關鍵字查找,如果所有的關鍵字都符合,則記錄結果 { p = Pattern.compile(a[i].toString()); m = p.matcher(resultString); if (!(m.find())) { searchResult="0"; } } //記錄符合條件的新聞 if(searchResult.equals("1")) { News resultNews=new News();//存放結果的類,和數據庫的結構基本一致 resultNews.content=content; resultNews.release_time=release_time; resultNews.type=news_type; resultNews.man_add=man_add; resultNews.title=title; news.addElement(resultNews);//最后的結果集,要返回客戶端 } } //關閉數據庫 DbaObj.CloseConnection() ; /SPAN>}catch(Exception e){ System.out.println(e.toString()); } } public class News { //存放結果的類 String content; String release_time; String type; String man_add; String title; public String getContent() { return this.content; } public String getTitle() { return this.title; } public String getTime() { return this.release_time; } public String getType() { return this.type; } public String getMan_add() { return this.man_add; } } } 下面的代碼是調用的:aftsearch.jsp <%@ page contentType="text/html; charset=gb2312" %> <%@ page import="java.util.*" %> <% request.setCharacterEncoding("GB2312"); String keyword=request.getParameter("keyword"); //接收關鍵字 String trace=getServletContext().getRealPath("/")+"xwxx\\news\\";//主體新聞存放路徑 NEWS.newsSearch newsSearch=new NEWS.newsSearch();//初始化檢索的bean newsSearch.setFilePath(trace);//設置主體新聞路徑 newsSearch.setKeyWord(keyword);//設置關鍵字 newsSearch.search();//檢索 Vector news=newsSearch.getResult();//取到結果 %> <html> <head> <title>新聞搜索</title> <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache"> <link rel="stylesheet" href="../css/style3.css"> &l;script LANGUAGE="javascript"> function open_window(id) { locat="./news/"+id+".html"; } </script> </head> <object id=hh2 classid="clsid:ADB880A6-D8FF-11CF-9377-00AA003B7A11"> <param name="Command" value="Maximize"></object> <body bgcolor=#F5FAF3 leftmargin="0" topmargin="0" marginwidth="0" marginheight="0"> <script> hh2.Click(); </script> <table width="621" border="0"> <tr> <td colspan=5> </font> </td> </tr> <tr valign="middle"> <td width="45%" height="22"> <div align="center" class = "t_header">標 題</div> </td> <td width="15%" height="22"> <div align="center" class = "t_header">類 別</div> </td> <td width="15%" height="22"> <div align="center" class = "t_header">發 布 人</div> </td> <td width="25%" height="22"> <div align="center" class = "t_header">發 布 時 間</div> </td> </tr> <tr bgcolor="#B7D79F" valign="middle"> <td colspan="4" height="2"></td> </tr> </table> <table width="624" border="0" bordercolor="#99CCFF"> <% String color=null; int j=0; if(!(news.size()==0)) { for (int i = 0; i < news.size(); i++) { j++; NEWS.newsSearch.News myNews=(NEWS.newsSearch.News)news.get(i); if(i%2==0) { color="#F5FAF3"; } else { color="#DBF7ED"; } %> <tr bgcolor = "<%=color%>"> <td width="45%" height="20"> <img src="http://edu.chinaz.com/Get/Program/Jsp/images/dot.gif" align = "absmiddle"> <a href="#" onClick="open_window(<%=myNews.getContent()%>)"> <%=myNews.getTitle()%></a> [page_break]</td> <td width="15%" height="20" align="center"> <%=myNews.getType()%> &nbs; </td> <td width="15%" height="20" align="center"> <%=myNews.getMan_add()%> </td> <td width="25%" height="20" align="center"> <%=myNews.getTime()%> </td> </tr> <% } } else{ out.println("對不起,沒有搜索到您要查找的新聞");} //和最前邊的else對應,判斷是否有記錄 %> <tr bgcolor="#B7D79F"> <td colspan="4" height="2"></td> </tr> <tr> <td colspan=4> <p align=right> </td> </tr> </table> <P align=center> 共搜索到新聞 <%=j%> 條 </body> </html> |
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