Two methods:
1. Copy all files and folders under a directory
2. Merge all text files under a file directory into the same file
The code copy is as follows:
package com.firewolf.test;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
public class FileReaderUtil {
public static void main(String[] args){
try {
//mergeFile(new File("C:/Documents and Settings/liuxing0/Desktop/New Folder/script"), new File("D:/all.sql"));
copyFiles(new File("G:/Study Materials/Notes"),new File("G:/Test"));
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Copy all files in a file directory.
* @param sourcePath Original file directory
* @param desPath Desition file directory
*/
private static void copyFiles(File sourceFile,File desFile) throws IOException{
if(sourceFile.isFile()){
File file = new File(desFile.getPath()+"/"+sourceFile.getName());
FileInputStream fis = new FileInputStream(sourceFile);
FileOutputStream fos = new FileOutputStream(file);
int len = 0;
byte[] buf = new byte[1024];
while((len = fis.read(buf)) != -1)
fos.write(buf,0,len);
}else{
File dir = new File(desFile.getPath()+"/"+sourceFile.getName());
if(!dir.exists())
dir.mkdir();
String[] names = sourceFile.list();
for (int i = 0; i < names.length; i++) {
copyFiles(new File(sourceFile.getPath()+"/"+names[i]),dir);
}
}
}
/**
* A method to uniquely combine all files under a file directory into one file (mainly used to merge many text files together)
* @param sourceFile
* @param decFile
* @return
* @throws IOException
*/
private static File mergeFile(File sourceFile,File decFile) throws IOException{
String[] fileList = sourceFile.list();
for (String string : fileList) {
File file = new File(sourceFile.getPath()+"/"+string);
if(!file.isDirectory()){
FileInputStream fis = new FileInputStream(file);
FileOutputStream fos = new FileOutputStream(decFile, true);
byte[] buffer = new byte[1024];
int len = 0;
while((len= fis.read(buffer)) != -1)
fos.write(buffer, 0, len);
}
else {
decFile = mergeFile(file,decFile);
}
}
return decFile;
}
}