团队）面向对象设计

一、面向对象程序设计

分为两部分，搜索对象设计和限制，服务层次设计引用。

package news;

/** * Title: 新闻搜索引擎
* Copyright: Copyright (c) 2003 * Company: * @author 计算机99630 沈晨 * @version 1.0 * @Download:http://www.codefans.net */

import java.io.IOException;

import org.apache.lucene.analysis.cn.ChineseAnalyzer; import org.apache.lucene.document.Document; import org.apache.lucene.document.Field; import org.apache.lucene.index.IndexWriter;

public class Index {

IndexWriter _writer = null; Index() throws Exception { _writer = new IndexWriter("c:\\News\\index", new ChineseAnalyzer(), true); }

/** * 把每条新闻加入索引中 * @param url 新闻的url * @param title 新闻的标题 * @throws java.lang.Exception */ void AddNews(String url, String title) throws Exception { Document _doc = new Document(); _doc.add(Field.Text("title", title)); _doc.add(Field.UnIndexed("url", url)); _writer.addDocument(_doc); }

/** * 优化并且清理资源 * @throws java.lang.Exception */ void close() throws Exception { _writer.optimize(); _writer.close(); } }

package news;

/** * Title: 新闻搜索引擎
* Copyright: Copyright (c) 2003 * Company: * @author 计算机99630 沈晨 * @version 1.0 * @Download:http://www.codefans.net */

import java.util.Iterator; import java.util.Vector;

import com.heaton.bot.HTMLPage; import com.heaton.bot.HTTP; import com.heaton.bot.Link;

public class HTMLParse { HTTP _http = null; public HTMLParse(HTTP http) { _http = http; }

/** * 对Web页面进行解析后建立索引 */ public void start() { try { HTMLPage _page = new HTMLPage(_http); _page.open(_http.getURL(), null); Vector _links = _page.getLinks(); Index _index = new Index(); Iterator _it = _links.iterator(); int n = 0; while (_it.hasNext()) { Link _link = (Link) _it.next(); String _herf = input(_link.getHREF().trim()); String _title = input(_link.getPrompt().trim()); _index.AddNews(_herf, _title); n++; } System.out.println("共扫描到" + n + "条新闻"); _index.close(); } catch (Exception ex) { System.out.println(ex); } } /** * 解决java中的中文问题 * @param str 输入的中文 * @return 经过解码的中文 */ public static String input(String str) { String temp = null; if (str != null) { try { temp = new String(str.getBytes("ISO8859_1")); } catch (Exception e) { } } return temp; }

}

package news;

/** * Title: 新闻搜索引擎
* Copyright: Copyright (c) 2003 * Company: 
* @version 1.0 * @Download:http://www.codefans.net */

import com.heaton.bot.HTTP; import com.heaton.bot.HTTPSocket; import com.heaton.bot.ISpiderReportable; import com.heaton.bot.IWorkloadStorable; import com.heaton.bot.Spider; import com.heaton.bot.SpiderInternalWorkload;

public class Searcher implements ISpiderReportable { public static void main(String[] args) throws Exception { IWorkloadStorable wl = new SpiderInternalWorkload(); Searcher _searcher = new Searcher(); Spider _spider = new Spider(_searcher, "http://www.chenshen.com/index.html", new HTTPSocket(), 100, wl); _spider.setMaxBody(100); _spider.start(); } public boolean foundInternalLink(String url) { return false; } public boolean foundExternalLink(String url) { return false; } public boolean foundOtherLink(String url) { return false; } public void processPage(HTTP http) { System.out.println("扫描网页：" + http.getURL()); new HTMLParse(http).start(); } public void completePage(HTTP http, boolean error) { } public boolean getRemoveQuery() { return true; } public void spiderComplete() { } }

package newsserver;

import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;

import org.apache.lucene.analysis.Analyzer; import org.apache.lucene.analysis.cn.ChineseAnalyzer; import org.apache.lucene.document.Document; import org.apache.lucene.queryParser.QueryParser; import org.apache.lucene.search.Hits; import org.apache.lucene.search.IndexSearcher; import org.apache.lucene.search.Query;

/** * Title: 新闻搜索引擎
* Copyright: Copyright (c) 2003 * Company: 
* @version 1.0 * @Download:http://www.codefans.net */

public class Results extends HttpServlet { private static final String CONTENT_TYPE = "text/html; charset=GBK"; //Initialize global variables public void init() throws ServletException { }

//Process the HTTP Get request public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String QC = request.getParameter("QueryContent"); if (QC == null) { QC = ""; } else { QC = input(QC); } response.setContentType(CONTENT_TYPE); PrintWriter out = response.getWriter(); try { Search(QC, out); } catch (Exception ex) { System.out.println(ex.getMessage()); } }

public void Search(String qc, PrintWriter out) throws Exception { // 从索引目录创建索引 IndexSearcher _searcher = new IndexSearcher("c:\\news\\index"); // 创建标准分析器 Analyzer analyzer = new ChineseAnalyzer(); // 查询条件 String line = qc; // Query是一个抽象类 Query query = QueryParser.parse(line, "title", analyzer);

out.println("<html>"); out.println("<head><title>搜索结果</title></head>"); out.println("<body bgcolor=#ffffff>"); out.println("<center>" + "<form action='/NewsServer/results' method='get'>" + "新闻搜索引擎:" + "<input type='text' name='QueryContent' size='20'>" + "<input type='submit' name='submit' value='开始搜索'>" + "</form></center>" ); out.println("搜索关键字：" + query.toString("title") + ""); Hits hits = _searcher.search(query); out.println(" 总共找到" + hits.length() + "条新闻 ");

final int HITS_PER_PAGE = 10; for (int start = 0; start < hits.length(); start += HITS_PER_PAGE) { int end = Math.min(hits.length(), start + HITS_PER_PAGE); for (int i = start; i < end; i++) { Document doc = hits.doc(i); String url = doc.get("url"); if (url != null) { out.println( (i + 1) + " <a href='" + url + "'>" + replace(doc.get("title"), qc) + "</a> "); } else { System.out.println("没有找到！"); } } } out.println("</body></html>"); _searcher.close(); };

public String input(String str) { String temp = null; if (str != null) { try { temp = new String(str.getBytes("ISO8859_1")); } catch (Exception e) { } } return temp; }

public String replace(String title, String keyword) { return title.replaceAll(keyword, "" + keyword + ""); };

//Clean up resources public void destroy() { } }

发表于 2015-06-14 20:27 学习用阅读(128) 评论(0) 编辑收藏举报

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