初步分析了一下，大概是因为POI底层OPCPackage.open方法有多个重载，easyExcel中使用的是OPCPackage open(InputStream in)；跟读后发现有如下代码：
byte[] buffer = new byte[4096];
int read = 0;
while( (read = inp.read(buffer)) != -1 ) {
baos.write(buffer, 0, read);
}
判断应该是由于这个问题导致OOM，修改为使用OPCPackage open(File file)或OPCPackage open(String path)可以正常解析。
附上异常信息：
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:3236)
at java.io.ByteArrayOutputStream.toByteArray(ByteArrayOutputStream.java:191)
at org.apache.poi.openxml4j.util.ZipInputStreamZipEntrySource$FakeZipEntry.(ZipInputStreamZipEntrySource.java:136)
at org.apache.poi.openxml4j.util.ZipInputStreamZipEntrySource.(ZipInputStreamZipEntrySource.java:56)
at org.apache.poi.openxml4j.opc.ZipPackage.(ZipPackage.java:100)
at org.apache.poi.openxml4j.opc.OPCPackage.open(OPCPackage.java:324)
at com.alibaba.excel.analysis.v07.XlsxSaxAnalyser.(XlsxSaxAnalyser.java:44)
at com.alibaba.excel.analysis.ExcelAnalyserImpl.getSaxAnalyser(ExcelAnalyserImpl.java:47)
at com.alibaba.excel.analysis.ExcelAnalyserImpl.analysis(ExcelAnalyserImpl.java:72)
at com.alibaba.excel.analysis.ExcelAnalyserImpl.analysis(ExcelAnalyserImpl.java:67)
at com.alibaba.excel.ExcelReader.read(ExcelReader.java:112)
at easyExcel.ExcelReaderTest.main(ExcelReaderTest.java:25)