用Java簡單實現文件分割與合並的事例

主要應用IO的RandomAccessFile(聽說斷點續傳也是用它實現)

以下為引用的內容：

　import Java.io.*;

class Fen{
 String fileName;
 int size;

 Fen(String fileName,String size){
  this.fileName = fileName;
  this.size = Integer.parseInt(size)*1024;
 }
 
  public void cut()throws Exception{
   int maxx = 0;
   File inFile = new File(fileName);
  
   int fileLength = (int)inFile.length();  //取得文件的大小
   int value;             //取得要分割的個數
  
   RandoMaccessFile inn = new RandomAccessFile(inFile,"r");//打開要分割的文件
  
  
   value = fileLength/size;
  
   int i=0;
   int j=0;
  
   //根據要分割的數目輸出文件
   for (;j    File outFile = new File(inFile.getName()+j+"zzii");
    RandoMaccessFile outt= new RandomAccessFile(outFile,"rw");
    maxx+=size;
    for (;i     outt.write(inn.read());
    }
    outt.close();
   }
   File outFile = new File(inFile.getName()+j+"zzii");
   RandoMaccessFile outt= new RandomAccessFile(outFile,"rw");
   for(;i
    outt.write(inn.read());
   }
   outt.close();
 
   inn.close();
 }
}

 class He{
  String fileName;
  String filterName;
  
   He(String fileName,String filterName){
    this.fileName = fileName;
    this.filterName = filterName;
   }
  
  
   public void unite()throws Exception{
    String [] tt;
    File inFile = new File("."); //在當前目錄下的文件
    File outFile = new File(fileName);  //取得輸出名
    RandoMaccessFile outt= new RandomAccessFile(outFile,"rw");
  
    //取得符合條件的文件名
    tt = inFile.list(new FilenameFilter(){
     public boolean accept(File dir,String name){
      String rr = new File(name).toString();
      return rr.endsWith(filterName);
     }
    });
    //打印出取得的文件名
    for (int i = 0;i     System.out.println(tt[i]);
    }
   
    //打開所有的文件再寫入到一個文件裡
    for(int i=0;i     inFile = new File(tt[i]);
     RandoMaccessFile inn= new RandomAccessFile(inFile,"r");
     int c;
     while((c=inn.read())!=-1)
      outt.write(c);
    }
   
    outt.close();
   }
  }
 

public class test{
 public static void main(final String [] args)throws Exception{
 
  if(args.length==0){
   print();
   return;
  }
  if(args[0].equals("-c")){
   Fen cutt = new Fen(args[1],args[2]);
   cutt.cut();
  }
  else if (args[0].equals("-r")){
   He hee = new He(args[1],args[2]);
   hee.unite();
  }
  else
   print();
  
 }
 
 public static void print(){
  System.out.println("usage:\n分: java test -c file1 size(單位為K)\n合 Java test -r file2 zzii(我設置的方便標識)");
}
}