如何用Java实现两个文件的拼接

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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);            }           }     }}

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