使用opencsv文件读写CSV文件

public class OpenCSV {
 public static void main(String[] args) throws Exception {
  OpenCSV oc = new OpenCSV();
  oc.CSVReadAll();

  oc.CSVWriter();
 }

 public String dir = System.getProperty("user.dir") + "/testMaven";

 public void CSVReadAll() throws Exception {
  File csv = new File(dir + "/file", "readerTest.csv");

  CSVReader reader = new CSVReader(new InputStreamReader(new FileInputStream(csv), "GBK"), ',');
  String [] header = reader.readNext(); //用readnext读取之后就不存在于stream中了
  for (String s : header) {
   System.out.print(s + ",");
  }
  System.out.println("");

  List list = reader.readAll(); //此时读取的已经是第二行了
  System.out.println(list.get(0)[0]);
  System.out.println("");
 }

 public void CSVWriter() throws Exception{
  File csv = new File(dir + "/file", "writerTest.csv");
  if (!csv.exists()) csv.createNewFile();

  List list = new ArrayList<>();
  String s1 = "123";
  for (int i = 0; i <22; i++) {
   String[] ss = {String.valueOf(i),String.valueOf(i),String.valueOf(i),String.valueOf(i)};
   list.add(ss);
  }

  CSVWriter writer = new CSVWriter(new OutputStreamWriter(new FileOutputStream(csv),"GBK"),CSVWriter.DEFAULT_SEPARATOR, CSVWriter.NO_QUOTE_CHARACTER);
  writer.writeNext(s1, s1, s1, s1);
  writer.writeNext("#","#","#","#");
  writer.writeAll(list);
  writer.flush();
  writer.close();
 }
}