巧用语言简单实现文件的分割与合并牛

主要应用IO的RandomAccessFile(听说断点续传也是用它实现)

import .*;

class Fen{

String fileName;

int size;

Fen(String fileName,String size){

leName = fileName;

ze = rseInt(size)*1024;

}

public void cut()throws Exception{

int maxx = 0;

File inFile = new File(fileName);

int fileLength = (int)ngth(); //取得文件的大小

int value; //取得要分割的个数

RandomAccessFile inn = new RandomAccessFile(inFile,\"r\");//打开要分割的文件

value = fileLength/size;

int i=0;

int j=0;

//根据要分割的数目输出文件

for (;jFile outFile = new File(tName()+j+\"zzii\");

RandomAccessFile outt= new RandomAccessFile(outFile,\"rw\");

maxx+=size;

for (;iite(ad());

}

ose();

}

File outFile = new File(tName()+j+\"zzii\");

RandomAccessFile outt= new RandomAccessFile(outFile,\"rw\");

for(;iite(ad());

}

ose();

ose();

}

}

class He{

String fileName;

String filterName;

He(String fileName,String filterName){

leName = fileName;

lterName = filterName;

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public void unite()throws Exception{

String [] tt;

File inFile = new File(\".\"); //在当前目录下的文件

File outFile = new File(fileName); //取得输出名

RandomAccessFile outt= new RandomAccessFile(outFile,\"rw\");

//取得符合条件的文件名

tt = st(new FilenameFilter(){

public boolean accept(File dir,String name){

String rr = new File(name).toString();

return dsWith(filterName);

}

});

//打印出取得的文件名

for (int i = 0;iintln(tt[i]);

}

//打开所有的文件再写入到一个文件里

for(int i=0;iinFile = new File(tt[i]);

RandomAccessFile inn= new RandomAccessFile(inFile,\"r\");

int c;

while((c=ad())!=-1)

ite(c);

}

ose();

}

}

public class test{

public static void main(final String [] args)throws Exception{

if(ngth==0){

print();

return;

}

if(args[0].equals(\"-c\")){

Fen cutt = new Fen(args[1],args[2]);

t();

}

else if (args[0].equals(\"-r\")){

He hee = new He(args[1],args[2]);

ite();

}

else

print();

}

public static void print(){

intln(\"usage:

分: java test -c file1 size(单位为K)

合 java test -r file2 zzii(我设置的方便标识)\");

}

}

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