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When I copy an MS Excel file to another Excel file, I'm getting garbage characte

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Question: When I copy an MS Excel file to another Excel file, I'm getting garbage characters together with the text.
How can I avoid it and copy only the real content?

Answer: Don't use a FileReader and characters to do the copying. An Excel file contains control characters that cannot be interpreted as text.
Use a FileInputStream and bytes, for example:

public void fCopy(String inputFile, String outputFile) {
try {
FileInputStream in=new FileInputStream(inputFile);
BufferedInputStream reader=new BufferedInputStream(in,4096);
FileOutputStream out=new FileOutputStream(outputFile);
BufferedOutputStream writer=new BufferedOutputStream(out,4096);
byte[] buf=new byte[4096];
int byteRead;
while ((byteRead=reader.read(buf,0,4096))>=0) {
catch (Throwable exception) {

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