TF-IDF（转）输出到文本

import java.io.*;
import java.util.*;

import org.wltea.analyzer.lucene.IKAnalyzer;

public class ReadFiles {

    /**
     * @param args
     */   
    private static ArrayList<String> FileList = new ArrayList<String>(); // the list of file

    //get list of file for the directory, including sub-directory of it
    public static List<String> readDirs(String filepath) throws FileNotFoundException, IOException
    {
        try
        {
            File file = new File(filepath);
            if(!file.isDirectory())
            {
                System.out.println("输入的[]");
                System.out.println("filepath:" + file.getAbsolutePath());
            }
            else
            {
                String[] flist = file.list();
                for(int i = 0; i < flist.length; i++)
                {
                    File newfile = new File(filepath + "\\" + flist[i]);
                    if(!newfile.isDirectory())
                    {
                        FileList.add(newfile.getAbsolutePath());
                    }
                    else if(newfile.isDirectory()) //if file is a directory, call ReadDirs
                    {
                        readDirs(filepath + "\\" + flist[i]);
                    }                   
                }
            }
        }catch(FileNotFoundException e)
        {
            System.out.println(e.getMessage());
        }
        return FileList;
    }
   
    //read file
    public static String readFile(String file) throws FileNotFoundException, IOException
    {
        StringBuffer strSb = new StringBuffer(); //String is constant， StringBuffer can be changed.
        InputStreamReader inStrR = new InputStreamReader(new FileInputStream(file), "gbk"); //byte streams to character streams
        BufferedReader br = new BufferedReader(inStrR);
        String line = br.readLine();
        while(line != null){
            strSb.append(line).append("\r\n");
            line = br.readLine();   
        }
       
        return strSb.toString();
    }
   
    //word segmentation
    public static ArrayList<String> cutWords(String file) throws IOException{
       
        ArrayList<String> words = new ArrayList<String>();
        String text = ReadFiles.readFile(file);
        IKAnalyzer analyzer = new IKAnalyzer();
        words = analyzer.split(text);
       
        return words;
    }
   
    //term frequency in a file, times for each word
    public static HashMap<String, Integer> normalTF(ArrayList<String> cutwords){
        HashMap<String, Integer> resTF = new HashMap<String, Integer>();
       
        for(String word : cutwords){
            if(resTF.get(word) == null){
                resTF.put(word, 1);
                System.out.println(word);
            }
            else{
                resTF.put(word, resTF.get(word) + 1);
                System.out.println(word.toString());
            }
        }
        return resTF;
    }
   
    //term frequency in a file, frequency of each word
    public static HashMap<String, Float> tf(ArrayList<String> cutwords){
        HashMap<String, Float> resTF = new HashMap<String, Float>();
       
        int wordLen = cutwords.size();
        HashMap<String, Integer> intTF = ReadFiles.normalTF(cutwords);
       
        Iterator iter = intTF.entrySet().iterator(); //iterator for that get from TF
        try
        {
        FileWriter writer = new FileWriter("d:\\DF.txt", true);
       
        while(iter.hasNext()){
            Map.Entry entry = (Map.Entry)iter.next();
            resTF.put(entry.getKey().toString(), Float.parseFloat(entry.getValue().toString()) / wordLen);
            System.out.println(entry.getKey().toString() + " = "+  Float.parseFloat(entry.getValue().toString()) / wordLen);
            // 输出到文件
            writer.write(entry.getKey().toString() + " = "+  Float.parseFloat(entry.getValue().toString()) / wordLen+"\r\n");
               
           
        }//end with while
        writer.close();
        }
        catch(Exception ex)
        {
       
        }
        return resTF;
    }
   
    //tf times for file
    public static HashMap<String, HashMap<String, Integer>> normalTFAllFiles(String dirc) throws IOException{
        HashMap<String, HashMap<String, Integer>> allNormalTF = new HashMap<String, HashMap<String,Integer>>();
       
        List<String> filelist = ReadFiles.readDirs(dirc);
        for(String file : filelist){
            HashMap<String, Integer> dict = new HashMap<String, Integer>();
            ArrayList<String> cutwords = ReadFiles.cutWords(file); //get cut word for one file
           
            dict = ReadFiles.normalTF(cutwords);
            allNormalTF.put(file, dict);
        }   
        return allNormalTF;
    }
   
    //tf for all file
    public static HashMap<String,HashMap<String, Float>> tfAllFiles(String dirc) throws IOException{
        HashMap<String, HashMap<String, Float>> allTF = new HashMap<String, HashMap<String, Float>>();
        List<String> filelist = ReadFiles.readDirs(dirc);
       
        for(String file : filelist){
            HashMap<String, Float> dict = new HashMap<String, Float>();
            ArrayList<String> cutwords = ReadFiles.cutWords(file); //get cut words for one file
           
            dict = ReadFiles.tf(cutwords);
            allTF.put(file, dict);
        }
        return allTF;
    }
    public static HashMap<String, Float> idf(HashMap<String,HashMap<String, Float>> all_tf){
        HashMap<String, Float> resIdf = new HashMap<String, Float>();
        HashMap<String, Integer> dict = new HashMap<String, Integer>();
        int docNum = FileList.size();
       
        for(int i = 0; i < docNum; i++){
            HashMap<String, Float> temp = all_tf.get(FileList.get(i));
            Iterator iter = temp.entrySet().iterator();
            while(iter.hasNext()){
                Map.Entry entry = (Map.Entry)iter.next();
                String word = entry.getKey().toString();
                if(dict.get(word) == null){
                    dict.put(word, 1);
                }else {
                    dict.put(word, dict.get(word) + 1);
                }
            }
        }
        System.out.println("IDF for every word is:");
        try
        {
        FileWriter writer = new FileWriter("d:\\IDF.txt", true);
        Iterator iter_dict = dict.entrySet().iterator();
        while(iter_dict.hasNext()){
            Map.Entry entry = (Map.Entry)iter_dict.next();
            float value = (float)Math.log(docNum / Float.parseFloat(entry.getValue().toString()));
            resIdf.put(entry.getKey().toString(), value);
            System.out.println(entry.getKey().toString() + " = " + value);
            writer.write(entry.getKey().toString() + " = " + value+"\r\n");
           
        }
        writer.close();
        }
        catch(Exception ex)
        {
        System.out.println("Error");
        return null;
        }
        return resIdf;
    }
    public static void tf_idf(HashMap<String,HashMap<String, Float>> all_tf,HashMap<String, Float> idfs){
        HashMap<String, HashMap<String, Float>> resTfIdf = new HashMap<String, HashMap<String, Float>>();
           
        int docNum = FileList.size();
        for(int i = 0; i < docNum; i++){
            String filepath = FileList.get(i);
            HashMap<String, Float> tfidf = new HashMap<String, Float>();
            HashMap<String, Float> temp = all_tf.get(filepath);
            Iterator iter = temp.entrySet().iterator();
            while(iter.hasNext()){
                Map.Entry entry = (Map.Entry)iter.next();
                String word = entry.getKey().toString();
                Float value = (float)Float.parseFloat(entry.getValue().toString()) * idfs.get(word);
                tfidf.put(word, value);
            }
            resTfIdf.put(filepath, tfidf);
        }
        System.out.println("TF-IDF for Every file is :");
        DisTfIdf(resTfIdf);
    }
    public static void DisTfIdf(HashMap<String, HashMap<String, Float>> tfidf){
        Iterator iter1 = tfidf.entrySet().iterator();
        try
        {
        FileWriter writer = new FileWriter("d:\\TF-IDF.txt", true);
        String strtemp="";
        while(iter1.hasNext()){
            Map.Entry entrys = (Map.Entry)iter1.next();
            System.out.println("FileName: " + entrys.getKey().toString());
            //writer.write("FileName: " + entrys.getKey().toString());
            System.out.print("{");
            writer.write("{");
            HashMap<String, Float> temp = (HashMap<String, Float>) entrys.getValue();
            Iterator iter2 = temp.entrySet().iterator();
           
           
           
            while(iter2.hasNext()){
                Map.Entry entry = (Map.Entry)iter2.next();
                System.out.print(entry.getKey().toString() + " = " + entry.getValue().toString() + ", ");
                // 输出到文件
                strtemp+=entry.getKey().toString() + " = " + entry.getValue().toString() + ", ";
                //writer.write(entry.getKey().toString() + " = " + entry.getValue().toString() + ", ");
               
            }
            strtemp=strtemp.substring(0, strtemp.length()-2);
            writer.write(strtemp);
            System.out.println("}");
            writer.write("}"+"\r\n");
        }
        writer.close();
       }
        catch(Exception ex)
        {
        System.out.println("error!");
        return;
        }
    }
    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        String file = "D:/testfiles";

        HashMap<String,HashMap<String, Float>> all_tf = tfAllFiles(file);
        System.out.println();
        HashMap<String, Float> idfs = idf(all_tf);
        System.out.println();
        tf_idf(all_tf, idfs);
       
    }

}