如何用Java实现两个文件的拼接

用Java语言实现两个文件的拼接与上一篇用Java实现两个文件的异或使用的方法都一样，都是FileInputStream（）与FileOutputStream（）方法，两个相同大小的文件a，b，把文件b拼接在文件a之后，输出的文件名为outfile具体代码详见下述内容：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class Append
{
static int count=0;
static int countb=0;

public static void main(String args[]) throws IOException
{
FileInputStream filea = new FileInputStream("d:\\JavaXor\\a");
FileInputStream fileb = new FileInputStream("d:\\JavaXor\\b");
File outfile=new File("d:\\JavaXor\\outfile");
int filesizea=filea.available();//计算文件的大小
int filesizeb=fileb.available();
FileOutputStream fos=new FileOutputStream(outfile);

int hasReada = 0;
int hasReadb=0;

byte[] bufa=new byte[1024];
byte[] bufc=new byte[1024];
byte[] buf_yua=new byte[filesizea%1024];
byte[] buf_yub=new byte[filesizeb%1024];

while(  (hasReada=filea.read(bufa) )>0 )
{
if(count<filesizea-filesizea%1024)
{
for(int i=0;i<bufa.length && count<filesizea-filesizea%1024;i++)
{

bufc[i]=(byte)(bufa[i] & 0xFF);
count++;

}
fos.write(bufc);
}
else if(count>=filesizea-filesizea%1024 && count<filesizea)
{

for(int j=0; count>=filesizea-filesizea%1024 && count<filesizea ;j++)
{
buf_yua[j]=(byte)(bufa[j] & 0xFF);
count++;

}
fos.write(buf_yua);
}

}

while(  (hasReadb=fileb.read(bufa) )>0 )
{
if(countb<filesizeb-filesizeb%1024)
{
for(int i=0;i<bufa.length && countb<filesizeb-filesizeb%1024;i++)
{

bufc[i]=(byte)(bufa[i] & 0xFF);
countb++;

}
fos.write(bufc);
}
else if(countb>=filesizeb-filesizeb%1024 && countb<filesizeb)
{

for(int j=0; countb>=filesizeb-filesizeb%1024 && countb<filesizeb ;j++)
{
buf_yub[j]=(byte)(bufa[j] & 0xFF);
countb++;

}
fos.write(buf_yub);
}

}

}

}