jfreechart画图是,用的是org.jfree.data.time.Hour,总是出错!??:(

[汇科天下]

jfreechart画图是,用的是org.jfree.data.time.Hour,总是出错!??:(


我用的是jfreechart-1.0.0-rc1和jcommon-1.0.0-rc1,从网上写的原代码生成的jar 文件和文档

我使用org.jfree.data.time.Day一切都是正常.
当我以小时为单位来画图的时候,将对应的org.jfree.data.time.Day改为org.jfree.data.time.Hour却在运行的时候报错:
org.jfree.data.general.SeriesException: You are trying to add data where the time period class is org.jfree.data.time.Hour, but the TimeSeries is expecting an instance of org.jfree.data.time.Day.
org.jfree.data.time.TimeSeries.add(TimeSeries.java:467)
com.cellcom.business.ServletHourHelp.getData(ServletHourHelp.java:150)
com.cellcom.business.ServletHourHelp.createTimeSeriesChart(ServletHourHelp.java:101)
com.cellcom.servlet.IvrBussEmployHourServlet.service(IvrBussEmployHourServlet.java:65)

不明白其实原因!求我!!!!
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以下是相应代码:
public HashMap getData(ServletRequest req) {

ArrayList[] servs = null;

BussEmployQuery query = new BussEmployQuery();
HashMap hashMapServs = query.getBussHourEmploy(req);

HashMap servIdMap = (HashMap) hashMapServs.get("info");
HashMap servsMap = (HashMap) hashMapServs.get("servsDataMap");

Iterator it = servIdMap.keySet().iterator();
TimeSeriesCollection result = new TimeSeriesCollection();
for (; it.hasNext(); ) { //取一个业务
String servId = (String) it.next();
String servName = (String) servIdMap.get(servId);

TimeSeries servEmploys = new TimeSeries(servName);
ArrayList dataList = (ArrayList) servsMap.get(servId);
for (int k = 0; k < dataList.size(); k++) {

IvrBussEmploy employ = (IvrBussEmploy) dataList.get(k);

servEmploys.add(new TimeSeriesDataItem(new Hour(employ.getHour(),employ.getDay(),employ.getMonth(),employ.getYear()), employ.getAccount()));//////////此处报错,

}
result.addSeries(servEmploys);
}
servsMap.put("data", result);
return servsMap;
}

[weicairong]

型别改变时发生的错误

[汇科天下]

public TimeSeriesDataItem(RegularTimePeriod period, Number value) { }

TimeSeries.add(TimeSeriesDataItem item)

这是所用到的两个方法,当TimeSeriesDataItem ()生成以Day的序列的数据是,一切正常,而当生成以Hour为序列的时候却出现了错误.
而Hour和Day类都是
java.lang.Object
|
+--org.jfree.data.time.RegularTimePeriod
|
+--org.jfree.data.time.Hour

java.lang.Object
|
+--org.jfree.data.time.RegularTimePeriod
|
+--org.jfree.data.time.Day

出现以上的异常,实在不明白是什么原因.
文档也没有说明Hour和Day有什么用法的区别

[汇科天下]

好了,问题已经得到了解决,

TimeSeries类在构造的时候,可以指定时间的刻度,如果不指定,就默认为Day.

在此类中,生成TimeSeries类是,写为
TimeSeries servEmploys = new TimeSeries(servName,Hour.class);

即可!!!!