代码：
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class FileTools {
public static byte[] readFile(String string) {
FileInputStream fileInputStream=null;
BufferedInputStream bufferedInputStream=null;
ByteArrayOutputStream bao=new ByteArrayOutputStream();
byte[] buff=new byte[1024];
try {
fileInputStream=new FileInputStream(string);
bufferedInputStream=new BufferedInputStream(fileInputStream);
int bytesRead=0;
while (-1!=(bytesRead=bufferedInputStream.read(buff,0,buff.length))) {
bao.write(buff,0,bytesRead);
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
fileInputStream.close();
bufferedInputStream.close();
buff=null;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return bao.toByteArray();
}
public static void writeFile(String string,byte[] bytes) {
FileOutputStream fileOutputStream=null;
BufferedOutputStream bufferedOutputStream=null;
try{
fileOutputStream=new FileOutputStream(string);
bufferedOutputStream =new BufferedOutputStream(fileOutputStream);
bufferedOutputStream.write(bytes);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
bufferedOutputStream.flush();
fileOutputStream.close();
bufferedOutputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}