Java 搜尋文字檔關鍵字並輸出

搜尋同一目錄內文字檔關鍵字後，並輸出整理到一個文字檔
可編譯為jar檔，重複使用

Source code:

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.regex.Matcher;


public class FindKeyWord {
    public static void main(String args[]) throws IOException{
        ReadClass mReadClass = new ReadClass();
        mReadClass.readData();
    }
}

class ReadClass{
    int count = 0;

    public void readData(){
        //String dirPath = "C:\\Users\\Test\\Desktop\\";
        String dirPathTemp = System.getProperty("user.dir");
        String dirPath = Matcher.quoteReplacement(dirPathTemp);
        CharSequence findWord = "keyword";
        File dir = new File(dirPath);
        StringBuilder sb = new StringBuilder();
        
        if(dir.exists() && dir.isDirectory()){
            String[] names = dir.list();
            for(String name: names){
                FileReader fr;
                try {
                    fr = new FileReader(dirPath + "\\"  + name);
                    BufferedReader bf = new BufferedReader(fr);
                    String data = null;
                    try {
                        while((data = bf.readLine()) != null){
                            if(data.contains(findWord)){
                                String regString = "=";
                                String[] StringArray = data.split(regString);
                                output(StringArray[1], dirPath);
                            }
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    try {
                        bf.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    } 
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }               
            }
        }else{
            String info = "路徑錯誤: " +  dirPath + "請重新輸入";
        }
    }
    public void output(String str, String dirPath) throws IOException{
        String filePath = dirPath + "\\" + "data.txt"; 
        FileWriter mFileWriter = new FileWriter(filePath, true);
        String item = null;
        if((count/10) < 1){
            item = "  " + Integer.toString(count);
        }else if((count/10) < 10){
            item = " " + Integer.toString(count);
        }else{
            item = Integer.toString(count);
        }
        String mString = new String(item + ", keyword = " + str + "\r\n");
        mFileWriter.write(mString);
        mFileWriter.flush();
        mFileWriter.close();
        count++;
    }
}