java读取写入csv文件Demo

读取Demo：

 

public static void main(String[] args) {
    File csv = new File("C:\\Result.csv");  // CSV文件路径
    BufferedReader br = null;
    try {
        br = new BufferedReader(new FileReader(csv));
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
    String line = "";
    String everyLine = "";
    try {
        List allString = new ArrayList<>();
        while ((line = br.readLine()) != null)  //读取到的内容给line变量
        {
            everyLine = line;
            System.out.println(everyLine);
            allString.add(everyLine);
        }
        System.out.println("csv表格中所有行数：" + allString.size());
    } catch (IOException e) {
        e.printStackTrace();
    }

}

 

 

 

 

写入Demo：

 

public static void main(String[] args) {
    try {
        File csv = new File("C://writers.csv");//CSV文件
        BufferedWriter bw = new BufferedWriter(new FileWriter(csv, true));
        //新增一行数据
        bw.newLine();
        bw.write("abc" + "," + "123" + "," + "1234");
        bw.close();
    } catch (FileNotFoundException e) {
        //捕获File对象生成时的异常
        e.printStackTrace();
    } catch (IOException e) {
        //捕获BufferedWriter对象关闭时的异常
        e.printStackTrace();
    }
}