我正在处理一个 .csv 文件的解析工作。我按照StackOverflow上另一个线程的建议下载了SuperCSV。现在，基本上所有事情都运行良好，但是现在我遇到了一个似乎很难解决的错误。
问题出在最后两列数据可能有值，也可能没有值。以下是一个示例 .csv 文件，第一行缺少最后一列，而第二行完全有值：
2012:07:25,11:48:20,922,"uLog.exe","",Key pressed,1246,341,-1.00,-1.00,1.00,Shift 2012:07:25,11:48:21,094,"uLog.exe","",Key pressed,1246,341,-1.00,-1.00,1.00,b,Shift
根据我对Super CSV Javadoc的理解，如果Java Bean中的列数不确定，则无法使用CsvBeanReader填充 Java Bean 。这看起来非常愚蠢，因为当初始化Bean时，我认为应该将这些缺失的列允许为空或其他默认值。
供参考，以下是我用于解析的完整代码：
public class ULogParser {
String uLogFileLocation;
String screenRecorderFileLocation;
private static final CellProcessor[] cellProcessor = new CellProcessor[] {
new ParseDate("yyyy:MM:dd"),
new ParseDate("HH:mm:ss"),
new ParseDate("SSS"),
new StrMinMax(0, 100),
new StrMinMax(0, 100),
new StrMinMax(0, 100),
new ParseInt(),
new ParseInt(),
new ParseDouble(),
new ParseDouble(),
new ParseDouble(),
new StrMinMax(0, 100),
new StrMinMax(0, 100),
};
public String[] header = {"Date", "Time", "Msec", "Application", "Window", "Message", "X", "Y", "RelDist", "TotalDist", "Rate", "Extra1", "Extra2"};
public ULogParser(String uLogFileLocation, String screenRecorderFileLocation)
{
this.uLogFileLocation = uLogFileLocation;
this.screenRecorderFileLocation = screenRecorderFileLocation;
}
public void parse()
{
try {
ICsvBeanReader reader = new CsvBeanReader(new BufferedReader(new FileReader(uLogFileLocation)), CsvPreference.STANDARD_PREFERENCE);
reader.getCSVHeader(false); //parse past the header
Entry entry;
entry = reader.read(Entry.class, header, cellProcessor);
System.out.println(entry.Application);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void sendToDB()
{
Query query = new Query();
}
}
而 Entry 类的代码：
public class Entry
{
private Date Date;
private Date Time;
private Date Msec;
private String Application;
private String Window;
private String Message;
private int X;
private int Y;
private double RelDist;
private double TotalDist;
private double Rate;
private String Extra1;
private String Extra2;
public Date getDate() { return Date; }
public Date getTime() { return Time; }
public Date getMsec() { return Msec; }
public String getApplication() { return Application; }
public String getWindow() { return Window; }
public String getMessage() { return Message; }
public int getX() { return X; }
public int getY() { return Y; }
public double getRelDist() { return RelDist; }
public double getTotalDist() { return TotalDist; }
public double getRate() { return Rate; }
public String getExtra1() { return Extra1; }
public String getExtra2() { return Extra2; }
public void setDate(Date Date) { this.Date = Date; }
public void setTime(Date Time) { this.Time = Time; }
public void setMsec(Date Msec) { this.Msec = Msec; }
public void setApplication(String Application) { this.Application = Application; }
public void setWindow(String Window) { this.Window = Window; }
public void setMessage(String Message) { this.Message = Message; }
public void setX(int X) { this.X = X; }
public void setY(int Y) { this.Y = Y; }
public void setRelDist(double RelDist) { this.RelDist = RelDist; }
public void setTotalDist(double TotalDist) { this.TotalDist = TotalDist; }
public void setRate(double Rate) { this.Rate = Rate; }
public void setExtra1(String Extra1) { this.Extra1 = Extra1; }
public void setExtra2(String Extra2) { this.Extra2 = Extra2; }
public Entry(){}
}
我遇到的异常（请注意，这是与上面示例不同的一行，缺少最后两列）：
Exception in thread "main" The value array (size 12) must match the processors array (size 13): You are probably reading a CSV line with a different number of columns than the number of cellprocessors specified context: Line: 2 Column: 0 Raw line:
[2012:07:25, 11:48:05, 740, uLog.exe, , Logging started, -1, -1, -1.00, -1.00, -1.00, ]
offending processor: null
at org.supercsv.util.Util.processStringList(Unknown Source)
at org.supercsv.io.CsvBeanReader.read(Unknown Source)
at processing.ULogParser.parse(ULogParser.java:59)
at ui.ParseImplicitData.main(ParseImplicitData.java:15)
是的，编写所有那些getter和setter真是烦死了。另外，我很抱歉，我可能在使用SuperCSV时没有完全遵守规范（例如，如果您只想要未修改的字符串应该使用哪个CellProcessor），但您能理解我的意思。此外，这段代码显然不完整。目前，我只是尝试成功地检索出一行数据。
此时，我想知道是否可以将CsvBeanReader用于我的目的。如果不行，我会有点失望，因为CsvListReader（我本来想发链接的，但StackOverflow不允许我这么做，太蠢了）几乎跟不使用API一样简单，只需要使用Scanner.next()。
如果有任何帮助，将不胜感激。提前感谢！