How to Export Data to CSV File in Java

In this example we will show how to export data to CSV file.

Source Code

1) ExportCSV.java

package com.beginner.examples;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.List;

public class ExportCSV {

	public static boolean exportCsv(File file, List dataList){
        boolean isSucess=false;
        
        FileOutputStream out=null;
        OutputStreamWriter osw=null;
        BufferedWriter bw=null;
        try {
            out = new FileOutputStream(file);
            osw = new OutputStreamWriter(out);
            bw =new BufferedWriter(osw);
            if(dataList!=null && !dataList.isEmpty()){
                for(String data : dataList){
                    bw.append(data).append("r");
                }
            }
            isSucess=true;
        } catch (Exception e) {
            isSucess=false;
        }finally{
            if(bw!=null){
                try {
                    bw.close();
                    bw=null;
                } catch (IOException e) {
                    e.printStackTrace();
                } 
            }
            if(osw!=null){
                try {
                    osw.close();
                    osw=null;
                } catch (IOException e) {
                    e.printStackTrace();
                } 
            }
            if(out!=null){
                try {
                    out.close();
                    out=null;
                } catch (IOException e) {
                    e.printStackTrace();
                } 
            }
        }
        return isSucess;
    }
	
	public static List importCsv(File file){
        List dataList=new ArrayList();
        
        BufferedReader br=null;
        try { 
            br = new BufferedReader(new FileReader(file));
            String line = ""; 
            while ((line = br.readLine()) != null) { 
                dataList.add(line);
            }
        }catch (Exception e) {
        }finally{
            if(br!=null){
                try {
                    br.close();
                    br=null;
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
 
        return dataList;
    }
}

2) CSVTest.java

package com.beginner.examples;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class CSVTest {

	public static void main(String[] args) {
		List dataList=new ArrayList();
        dataList.add("1,Alice,female");
        dataList.add("2,Bob,male");
        dataList.add("3,Jack,male");
        boolean isSuccess=ExportCSV.exportCsv(new File("E:tmpExportCSV.csv"), dataList);
        System.out.println(isSuccess);
        
        List dataList2=ExportCSV.importCsv(new File("E:\tmp\ExportCSV.csv"));
        if(dataList!=null && !dataList.isEmpty()){
            for(String data : dataList){
                System.out.println(data);
            }
        }

	}

}

Output:

true
1,Alice,female
2,Bob,male
3,Jack,male

References

Imported packages in Java documentation: