java实现CSV 字段分割

支持引号嵌套，逗号分割

private static String[] cvsField(String line){
    List fields = new LinkedList<>();
    char[] alpah = line.toCharArray();
    boolean isFieldStart = true;
    int pos = 0; int len = 0; boolean yinhao = false;
    for(char c : alpah){
      if(isFieldStart){
        len = 0;
        isFieldStart = false;
      }
      if(c == '\"'){
        yinhao = !yinhao;
      }
      if(c == ',' && !yinhao){
        fields.add(new String(alpah, pos - len, len));
        isFieldStart = true;
      }
      pos++; len++;
    }
    return fields.toArray(new String[0]);
  }

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