在类似java的csv文件中读取文本文件

我在文件数组中循环时遇到了一个问题

以下是阅读代码：

public static  ArrayList<String> readData(int colNo)  {

        Scanner sca;
        try {
            sca = new Scanner(new File("txt1.txt"));
            while(sca.hasNext()) {
                String  data=sca.next();
                String[] value=data.split(",");
                System.out.println(value[colNo]);
            }
            sca.close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;


    }

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我不确定是否正确理解了您的问题，但如果您试图逐行打印文件，尝试使用bufferedReader和readLine：

FileReader fr = new fileReader(“filename”); 
BufferedReaderbr = new BufferedReader(fr);
string l; 
l = br.readLine();

那么

---

当没有更多行可读取时，bufferedReader流方法readLine返回null。希望这有帮助

这是我问题的解决方案，它是有效的。希望它能帮助别人

public static void main(String[] args) throws IOException {
    // TODO Auto-generated method stub

    ArrayList < String > empname = new ArrayList < String > ();
    ArrayList < String > empsalary = new ArrayList < String > ();
    loadData(empid, empname, empsalary);

    for (int i = 0; i < empname.size(); i++) {
        //do some event here
    }

}


public static void loadData(ArrayList < String > empid, ArrayList < String > empname, ArrayList < String > empsalary) {

    try {
        File file = new File("empdata.txt");
        Scanner scanner = new Scanner(file);

        while (scanner.hasNextLine()) {
            String line = scanner.nextLine();
            String tokens[] = line.split("\\|");
            empid.add(tokens[0].trim());
            empname.add(tokens[1].trim());
            empsalary.add(tokens[2].trim());

        }

        scanner.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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FileReader fr = new fileReader(“filename”); 
BufferedReaderbr = new BufferedReader(fr);
string l; 
l = br.readLine();

    while((l = br.readline())(=null) {
}

public static void main(String[] args) throws IOException {
    // TODO Auto-generated method stub

    ArrayList < String > empname = new ArrayList < String > ();
    ArrayList < String > empsalary = new ArrayList < String > ();
    loadData(empid, empname, empsalary);

    for (int i = 0; i < empname.size(); i++) {
        //do some event here
    }

}


public static void loadData(ArrayList < String > empid, ArrayList < String > empname, ArrayList < String > empsalary) {

    try {
        File file = new File("empdata.txt");
        Scanner scanner = new Scanner(file);

        while (scanner.hasNextLine()) {
            String line = scanner.nextLine();
            String tokens[] = line.split("\\|");
            empid.add(tokens[0].trim());
            empname.add(tokens[1].trim());
            empsalary.add(tokens[2].trim());

        }

        scanner.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}