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); } } } }
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