多个变量进行导出代码如下：

 @GetMapping("/export")public String varExport(@ModelAttribute FileSaveVars params ) throws IOException, InvalidRangeException {
//      1° 设置原始文件路径+转存文件路径String filePath = "/Users/caowei/workspace/jszone/大气系统/ncdemo/src/main/resources/static/MERRA2_400.tavg1_2d_flx_Nx.20180101.SUB.nc";String savePath = "/Users/caowei/workspace/test.nc";
//      2° 读取文件NetcdfFile ncFile = NetcdfFile.open(filePath, null);//     3° 构造输出保存文件NetcdfFileWriter ncWrite = NetcdfFileWriter.createNew(NetcdfFileWriter.Version.netcdf4, savePath);
//      4° 文件纬度for(Dimension dimension : ncFile.getDimensions()){ncWrite.addDimension(null, dimension.getName(), dimension.getLength());}
//      5° 设置需要转存的变量List<String> varNames = Arrays.asList("lon","lat","time","QLML");List<Variable> varArray = new ArrayList<>();for(String varName : varNames){Variable varObject = ncFile.findVariable(varName);Variable varVar = ncWrite.addVariable(null, varObject.getName().toString(), varObject.getDataType(),varObject.getDimensionsString());varVar.addAll(ncFile.findVariable(varName).getAttributes());varArray.add(varVar);}
//      6° 创建ncWrite.create();
//      7° 变量赋值for(Variable varItem:varArray){Array varData = ncFile.findVariable(varItem.getName()).read();ncWrite.write(varItem, varData);}
//      8°关闭保存ncWrite.close();return  "OK";}