HW.java~

import java.lang.*;
import java.io.*;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;
import java.util.Calendar;
import java.util.Date;
import java.io.FileWriter;
import java.text.SimpleDateFormat;


import javax.servlet.*;
import javax.servlet.ServletException;
import javax.servlet.http.*;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HW extends HttpServlet 
{
    public void doPost(HttpServletRequest request, HttpServletResponse response) 
           throws ServletException, IOException, NullPointerException
    {
        response.setContentType("text/html;charset=UTF-8");
        request.setCharacterEncoding("UTF-8");

        PrintWriter logger = new PrintWriter(new FileWriter("/opt/tomcat8/logs/logger"+System.currentTimeMillis(), true));

        
        String queryString = request.getParameter("words");     // 取得輸入的查詢字串
        SearchFiles searcher = new SearchFiles();
        String filename = "", line = "", hitsCount = "", url = "";
        dirPair tmp;
        Map<Integer, dirPair> map = new HashMap<Integer, dirPair>();
        FileReader fr;
        BufferedReader br;
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss.SSS");
        Date current = new Date();

        try
        {
            /*查詢*/
            filename = searcher.doQuery(queryString);  

            /*開啟 output 的詞頻統計檔案，用 Map<String, Set<Pair>> 統計各資料夾的辭彙數目*/
            fr = new FileReader(filename);
            br = new BufferedReader(fr);

            int dirIndexStart = 0, dirIndexEnd = 0, dirNumber = 0, dirFreq = 0;
            int i = 0, accumulator = 0;
            while((line = br.readLine()) != null)
            {
                if(i == 0)
                {
                    hitsCount = line;            
                    i++;        //因為之後不會再用到 i , 且之後 i 必不等於 0 ，就不需要每次 ++ ，可以省去此步驟
                }
                else
                {
                    /* Path format: slate/[directory number]/[filename].txt:[term frequence]  */
                    dirIndexStart = line.indexOf("/") + 1;                  //the 1st '/'
                    dirIndexEnd = line.indexOf("/", dirIndexStart);         // the 2nd '/'
                    /* dirIndexEnd 之所以不用 -1 是因為 substring(start, end); 所回傳的字串不包含 end 那個字元 */
                    dirNumber = Integer.parseInt(line.substring(dirIndexStart, dirIndexEnd)); 
                    dirFreq = Integer.parseInt(line.substring(line.indexOf(":") + 1));
                    
                    if(map.get(dirNumber)==null)
                    {
                        dirPair pair = new dirPair(dirNumber, dirFreq);           
                        map.put(dirNumber, pair);
                    }
                    else
                    {   
                        tmp = map.get(dirNumber);          
                        accumulator = tmp.getCount();
                        tmp.setCount(++accumulator);
                        map.put(dirNumber, tmp);
                    }    
                }//end of else(i == 0)              
            }//end of while
            br.close();
            fr.close();

            /*刪除 term_frequence[time] 檔案*/           
            File file = new File(filename);
            file.delete();
            file = null;

            /*呼叫 Google Char 繪圖*/
            DrawChart chart = new DrawChart();          // 建立 DrawChart 物件 (tmp)
            url = chart.draw(map);                  // 取得結合繪圖參數的 API Acess URL (tmp)

        }//end of try
        catch(Exception e)
        {
            logger.println(sdf.format(current)+": "+e.toString());

            StackTraceElement[] stack  = e.getStackTrace();
            for(StackTraceElement s: stack)
            {
                logger.println(s.toString()+"\n");
            }

        }

        logger.println(sdf.format(current)+": "+"Finished!");
        logger.close();

        /*HTML Output*/
        PrintWriter out = response.getWriter();     // 建立輸出物件
        Collection collection = map.values();
        Iterator iterator = collection.iterator();
        out.println("<html>");
        out.println("<body>");
        out.println("<a href='http://140.119.164.141:8080/2013IRHW'>回查詢頁</a><br>");
        out.println("<p>Search for: "+queryString+"</p>");
        out.println("<p>"+ hitsCount +"</p>");
        out.println("<p><img alt='Google Chart' src='"+ url +"'></p>");

        while(iterator.hasNext()) 
        {
           tmp = (dirPair)iterator.next();
           out.println("<p>Directory "+tmp.getNumber()+": "+tmp.getCount()+"</p>");
        }
        
        out.println("</body>");
        out.println("</html>");
  }//end of doPost
}

class dirPair
{
    private int dirNumber;
    private int termCount;
    
    dirPair(int dirNum, int termCnt)
    {
        this.dirNumber = dirNum;
        this.termCount = termCnt;
    }
    
    int getCount()
    {
        return this.termCount;
    }

    int getNumber()
    {
        return this.dirNumber;
    }

    void setCount(int termCnt)
    {
        this.termCount = termCnt;    
    }
    
}