java实现两个文件的拼接

时间:2022-11-13 21:17:57

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:

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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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原文链接:https://blog.csdn.net/u013555975/article/details/50294047