java.lang.Object --- java.io.InputStream ------ java.io.FileInputStream
FileInputStream represents a file that might not be made of regular text.
FileInputStream表示一个不由常规文本构成的文件。
To set the marker for the XML column, open a FileInputStream, passing in the location of our XML file.
要为xml列设置标志符，需打开一个FileInputStream，并传递XML文件的位置。
When instantiating the FileInputStream, pass it a String describing the path to the Excel file to read.
在实例化FileInputStream时，向它传递一个String，用于描述要读取的Excel文件的路径。
java.lang.Object --- java.io.InputStream ------ java.io.FileInputStream
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