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我从这里下载了一些GRIB数据文件：ftp://data-portal.ecmwf.int/20160721000000/（文件类型为.bin），并希望从这个文件在我的Java应用程序中提取数据（我想稍后将提取的数据加载到数据库中）。我只是想用文件ftp://wmo:[email protected]/20160721000000/A_HWXE85ECEM210000_C_ECMF_20160721000000_24h_em_ws_850hPa_global_0p5deg_grib2.bin。的Java GRIB-解码器：从GRIB2文件中提取数据
因此我创建了一个新的Java项目并添加了两个库grib-8.0.29.jar和netcdfAll-4.6.6.jar。有关grib API的文档可以在此处找到：http://www.unidata.ucar.edu/software/decoders/grib/javadoc/。我需要打开下载的文件才能获取数据。通过Grib2Dump检索一些元数据似乎工作（见下文）。另外，Grib2Input例如赛斯，我有版本2.
这里获取一些元数据我工作的代码的一个有效GRIB文件：
public static void main(String[] args) throws IOException, InterruptedException {
File srcDir = new File("C://test//");
File[] localFiles = srcDir.listFiles();
for (File tempFile : localFiles) {
RandomAccessFile raf = new RandomAccessFile(tempFile.getAbsolutePath(), "r");
System.out.println("======= Grib2GDSVariables ==========");
Grib2GDSVariables gdsVariables = new Grib2GDSVariables(raf.readBytes(raf.read()));
System.out.println("Gds key : " + gdsVariables.getGdsKey());
System.out.println("======= Grib2Input ==========");
Grib2Input input = new Grib2Input(raf);
System.out.println(Grib2Input.isValidFile(raf));
System.out.println("scan : " + input.scan(true, true));
System.out.println("getGDSs.size: " + input.getGDSs().size());
System.out.println("getProducts.size: " + input.getProducts().size());
System.out.println("getRecords.size: " + input.getRecords().size());
System.out.println("edition: " + input.getEdition());
System.out.println("======= Grib2Dump ==========");
Grib2Dump dump = new Grib2Dump();
dump.gribDump(new String[] {tempFile.getAbsolutePath()});
System.out.println("======= Grib2ExtractRawData ==========");
Grib2ExtractRawData extractRawData = new
Grib2ExtractRawData(raf); extractRawData.main(new String[] {tempFile.getAbsolutePath()});
}
System.out.println("finished");
}
这将产生以下的输出：
======= Grib2GDSVariables ==========
Gds key : -1732955898
======= Grib2Input ==========
true
scan : true
getGDSs.size: 0
getProducts.size: 0
getRecords.size: 0
edition: 2
======= Grib2Dump ==========
--------------------------------------------------------------------
Header : GRIB2
Discipline : 0 Meteorological products
GRIB Edition : 2
GRIB length : 113296
Originating Center : 98 European Center for Medium-Range Weather Forecasts (RSMC)
Originating Sub-Center : 0
Significance of Reference Time : 1 Start of forecast
Reference Time : 2016-07-21T00:00:00Z
Product Status : 0 Operational products
Product Type : 1 Forecast products
Number of data points : 259920
Grid Name : 0 Latitude_Longitude
Grid Shape: 6 Earth spherical with radius of 6,371,229.0 m
Number of points along parallel: 720
Number of points along meridian: 361
Basic angle : 0
Subdivisions of basic angle: -9999
Latitude of first grid point : 90.0
Longitude of first grid point : 0.0
Resolution & Component flags : 48
Winds : True
Latitude of last grid point : -90.0
Longitude of last grid point : 359.5
i direction increment : 0.5
j direction increment : 0.5
Grid Units : degrees
Scanning mode : 0
Product Definition : 2 Derived forecast on all ensemble members at a point in time
Parameter Category : 2 Momentum
Parameter Name : 1 Wind_speed
Parameter Units : m s-1
Generating Process Type : 4 Ensemble Forecast
ForecastTime : 24
First Surface Type : 100 Isobaric surface
First Surface value : 85000.0
Second Surface Type : 255 Missing
Second Surface value : -9.999E-252
======= Grib2ExtractRawData ==========
finished
我现在尝试了两天，但无法使用它！我无法从文件中获取内容数据（lat，lon，value）...
有人可以在Java中给出一个例子吗？