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开发实例：JSP中实现全文检索

时间： 2021-07-31 作者：daque

jsp中的全文字笔迹检验索全文字笔迹检验索从来都是web上面的要害本领，怎样在不计其数的消息中找到本人想要的消息是人们最关怀的。赫赫有名的google即是一个很胜利的例子，搜集上的人们大局部都用google来搜索本人须要的实质。全文字笔迹检验索重要有两个本领目标：赶快和透彻。前一段功夫做了一个消息体例，东家要加上全文字笔迹检验索的功效，想了很久才用一个不太巧妙的本领实行了。此刻瓜分一下，蓄意是举一反三吧，即使大师有更好的方法请跟在后边：）先引见一下我的消息体例：数据库里存消息的基础消息，如题目，颁布人，颁布功夫，主体消息的文献名。消息主体是html方法的静态页（第一是要普及速率，减少量据库的压力。第二是数据库处置大字符串的功夫会有题目。）。全文字笔迹检验索的思绪是：先从数据库里把一切的消息检索出来，把主体消息找到，而后经过io操纵把主体消息读到一个字符串中。再去掉过剩的货色，象html标志什么的，再用正则表白式对这个字符串搜索，即使找到适合前提的消息，就记载这条消息。结果归来一切的适合前提的消息表露给用户。底下这段代码是输出查问前提的代码，查问要害字用”+”隔绝：search.jsp<html><head><link rel="stylesheet" href="css/style3.css"><title>消息探求</title><script language="javascript"> function subform(){ if (document.zl_form.keyword.value=="") { alert("请输出要害字！"); 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%">输出查问要害字:</td> <td align="left" width="65%"> <input size="50" type="text" name="keyword" style="font-size: 9pt"> <input type="submit" name="submit" value="探求" style="font-size: 9pt"> </td> </tr> <tr> <td colspan="2" height="9" align="left"> <br> <font color="red" size="+1">证明：即使有多个查问前提，中央用</font><font size="+2">+</font><font color="red" size="+1">隔绝。如:1+2+3+4...</font></td> </tr></table> </form> </body> </html> 底下的代码是全文字笔迹检验索主体javabean的代码：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;//数据库操纵的bean public class newssearch { private string filepath=null;//主体消息寄存的目次 private string keyword=null;//查问要害字 private vector news = new vector();//寄存适合前提的截止 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() { //翻开数据库 resultset result=null; string msql=null; preparedstatement prestmt=null; dbstep.idbmanager2000 dbaobj=new dbstep.idbmanager2000(); dbaobj.openconnection(); try { //检索一切的消息 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"); //按行读文献 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; } //去掉过剩字符 htmlencode.htmlencode html=new htmlencode.htmlencode();//这个bean去掉过剩的字符，消息是本人天生的文献，不妨尽管多的简略过剩字符 resultstring=html.textencode(resultstring); myfilereader.close(); //掏出查问要害字 pattern p=null; matcher m=null; p = pattern.compile("\\+"); string[] a=p.split(keyword);//把要害字用+划分 //全文字笔迹检验索 string searchresult="1";//检索截止 int i; for(i=0;i<a.length;i++)//逐一按要害字搜索，即使一切的要害字都适合，则记载截止 { p = pattern.compile(a[i].tostring()); m = p.matcher(resultstring); if (!(m.find())) { searchresult="0"; } } //记载适合前提的消息 if(searchresult.equals("1")) { news resultnews=new news();//寄存截止的类，和数据库的构造基础普遍 resultnews.content=content; resultnews.release_time=release_time; resultnews.type=news_type; resultnews.man_add=man_add; resultnews.title=title; news.addelement(resultnews);//结果的截止集，要归来存户端 } } //封闭数据库 dbaobj.closeconnection() ; }catch(exception e){ system.out.println(e.tostring()); } } public class news { //寄存截止的类 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; } }}底下的代码是挪用的：aftsearch.jsp<%@ page contenttype="text/html; charset=utf8" %><%@ page import="java.util.*" %><% request.setcharacterencoding("gb2312"); string keyword=request.getparameter("keyword"); //接受要害字 string trace=getservletcontext().getrealpath("/")+"xwxx\\news\\";//主体消息寄存路途 news.newssearch newssearch=new news.newssearch();//初始化检索的bean newssearch.setfilepath(trace);//树立主体消息路途 newssearch.setkeyword(keyword);//树立要害字 newssearch.search();//检索 vector news=newssearch.getresult();//取到截止%><html><head><title>消息探求</title><meta http-equiv="cache-control" content="no-cache"><link rel="stylesheet" href="../css/style3.css"><script language="javascript"> function open_window(id){ locat="./news/"+id+".html"; window.open(locat,"new","width=550,height=500 ,scrollbars=yes")}</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">标题</div> </td> <td width="15%" height="22"> <div align="center" class = "t_header">类别</div> </td> <td width="15%" height="22"> <div align="center" class = "t_header">发布人</div> </td> <td width="25%" height="22"> <div align="center" class = "t_header">发布时间</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://www.okasp.com/techinfo/images/dot.gif" align = "absmiddle"><a href="#" onclick="open_window(<%=mynews.getcontent()%>)"> <%=mynews.gettitle()%></a></td> <td width="15%" height="20" align="center"><%=mynews.gettype()%> </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("抱歉，没有探求到您要搜索的消息");} //和最前边的else对应,确定能否有记载 %> <tr bgcolor="#b7d79f"> <td colspan="4" height="2"></td> </tr> <tr> <td colspan=4><p align=right> </td> </tr> </table><p align=center> 共探求到消息 <%=j%> 条 </body></html>0xmlscript.src="http://guide.pconline.com.cn/comment/commentservice_js.jsp?"+(new date()); 0xmlscript.src="http://guide.pconline.com.cn/comment/commentservice_js.jsp?"+(new date()); 0xmlscript.src="http://guide.pconline.com.cn/comment/commentservice_js.jsp?"+(new date()); 0xmlscript.src="http://guide.pconline.com.cn/comment/commentservice_js.jsp?"+(new date()); 0xmlscript.src="http://guide.pconline.com.cn/comment/commentservice_js.jsp?"+(new date()); （根源：csdn）

开发实例：JSP中实现全文检索

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