CSV파일 처리

CSV파일 처리

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class JavaExam {
	public static void main(String[] args) {
		CSVReader csvReader = new CSVReader();
		List<List<String>> csvList = csvReader.readCSV();
		csvReader.printCSV(csvList);
		CSVWriter csvWriter = new CSVWriter(csvList);
		csvWriter.writeCSV();
	}
}

class CSVWriter{
	List<List<String>> csvList;
	
	public CSVWriter(List<List<String>> csvList) {
		super();
		this.csvList = csvList;
	}

	public void writeCSV() {
		BufferedWriter bufferedWriter = null;
		try {
			bufferedWriter = Files.newBufferedWriter(
					Paths.get("data1_write.csv"), Charset.forName("UTF-8"));
			
			for(List<String> line : csvList) {
				for(int i=0; i<line.size(); i++) {
					bufferedWriter.write(line.get(i));
					if(i != line.size()-1)
						bufferedWriter.write(",");
				}
				bufferedWriter.newLine();
			}
		}
		catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		catch (IOException e) {
			e.printStackTrace();
		}
		finally {
			try {
				if(bufferedWriter != null)
					bufferedWriter.close();
			}
			catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
}


class CSVReader{
	
	List<List<String>> csvList;
	
	public CSVReader() {
		this.csvList = readCSV();
	}
	
	public void printCSV(List<List<String>> csvList) {
		for(int i=0; i<csvList.size();i++) {
			for(int j=0; j<csvList.get(i).size();j++) {
				System.out.print(csvList.get(i).get(j)+" ");
			}
			System.out.println();
		}
	}
	
	public List<List<String>> readCSV(){
		List<List<String>> csvList = new ArrayList<List<String>>();
		BufferedReader bufferedReader = null;
		
		try {
			bufferedReader = Files.newBufferedReader(Paths.get("data1.csv")
					,Charset.forName("UTF-8")); //"MS949", "UTF-8", "EUC-KR"
			String line = "";
			while((line=bufferedReader.readLine()) != null) {
				List<String> aLine = new ArrayList<String>();
				String[] lineArr = line
						.replace("\"", "")
						.replace("\uFEFF", "").split(",");
				aLine = Arrays.asList(lineArr);
				csvList.add(aLine);
			}
		}
		catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		catch(IOException e){
			e.printStackTrace();
		}
		finally {
			try {
				if(bufferedReader != null)
					bufferedReader.close();
			}
			catch (IOException e) {
				e.printStackTrace();
			}
		}
		
		return csvList;
	}
}