JAVA - 将CSV导入ArrayList

Question

我正在尝试使用导入CSV文件:ArraylistStringTokenizer

public class Test
{
  public static void main(String [] args)
  {
    List<ImportedXls> datalist = new ArrayList<ImportedXls>();

    try
    {
      FileReader fr = new FileReader("c:\\temp.csv");
      BufferedReader br = new BufferedReader(fr);
      String stringRead = br.readLine();

      while( stringRead != null )
      {
        StringTokenizer st = new StringTokenizer(stringRead, ",");
        String docNumber = st.nextToken( );
        String note = st.nextToken( );  /** PROBLEM */
        String index = st.nextToken( ); /** PROBLEM */

        ImportedXls temp = new ImportedXls(docNumber, note, index);
        datalist.add(temp);

        // read the next line
        stringRead = br.readLine();
      }
      br.close( );
    }
    catch(IOException ioe){...}

    for (ImportedXls item : datalist) {
      System.out.println(item.getDocNumber());
    }
  }
}

我不明白是怎么nextToken工作的,因为如果我继续初始化三个变量(docNumber,note和index)的nextToken(),它失败的:

Exception in thread "main" java.util.NoSuchElementException
    at java.util.StringTokenizer.nextToken(Unknown Source)
    at _test.Test.main(Test.java:32)

如果我只保留docNumber,它就可以了.你可以帮帮我吗？

Answer 1

您的输入文件中的某些行似乎有少于3个逗号分隔的字段.您应该始终检查tokenizer是否有更多令牌(StringTokenizer.hasMoreTokens),除非您100%确定您的输入是正确的.

CORRECT解析CSV文件并非如此简单.为什么不使用能够做得很好的库 - http://opencsv.sourceforge.net/？