如何在java中获取csv文件的行索引

Question

我的程序是验证输入的代码号是否为空。条件是如果输入了代码号（通过 csv 文件）继续，如果代码号为空，则会显示错误消息。 “代码编号在第 :__ 行为空”。 我的问题是如何打印代码号为空的行的索引。

这是我的示例数据（csv）：

CRITERIA  CODE  NAME  AGE ADDRESS
ADD       0001  JOHN  21  USA
ADD             MICH  16  EUR
ADD             ALI   11  PHL

错误信息应该是：

"The code number is empty in line 2."
"The code number is empty in line 3."

这是我目前的程序：

private static String[] sNextLine2; 
public static Map<String,Employee> getChanges
( String sFileName, Map<String, Employee> mEmployeeList )
throws IOException {
                                    //Read_File
    setReader2(new CSVReader(new FileReader(sFileName)));
    while ((sNextLine2 = reader2.readNext()) != null) { 
    switch(sNextLine2[0]) {
        case "ADD":         
            if(sNextLine2[1].isEmpty()) {
                System.out.println("The code number is empty in line" + lineNumber); //how to get that line number

            } else if (mEmployeeList.containsKey(sNextLine2[1]))
            {
                System.out.println("Data already exist");
            }
            else
            {
                mEmployeeList.put(sNextLine2[1],new Employee(sNextLine2[1],
                        sNextLine2[2], sNextLine2[3], sNextLine2[4], sNextLine2[5],
                        sNextLine2[6], sNextLine2[7], sNextLine2[8]));
            }

            break;
    } 

我希望有人能在这方面帮助我。谢谢！

Answer 1

你可以添加一个计数器，它每.readNext()递增一次，如果有错误就让它打印

 int counter=0;
 while ((sNextLine2 = reader2.readNext()) != null) { 
    counter++;
    switch(sNextLine2[0]) {
        case "ADD":         
            if(sNextLine2[1].isEmpty()) {
                System.out.println("The code number is empty in line" + counter); //how to get that line number

            } else if (mEmployeeList.containsKey(sNextLine2[1]))
            {
                System.out.println("Data already exist");
            }
            else
            {
                mEmployeeList.put(sNextLine2[1],new Employee(sNextLine2[1],
                        sNextLine2[2], sNextLine2[3], sNextLine2[4], sNextLine2[5],
                        sNextLine2[6], sNextLine2[7], sNextLine2[8]));
            }

            break;
    }