用Java简单实现文件分割与合并

主要应用IO的RandomAccessFile(听说断点续传也是用它实现) k??乌???? 
　import java.io.*; \ ??qX驹? 
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class Fen{ ??u??}????  
String fileName; ??@??C*^  
int size; cT"{点K? 
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Fen(String fileName,String size){ ??? ?8M  
this.fileName = fileName; 顿??$A<??  
this.size = Integer.parseInt(size)*1024; 菇?%??帷L  
} Ox??P??? 
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public void cut()throws Exception{ 躁??X???0  
int maxx = 0; ?????}v? 
File inFile = new File(fileName); ?E??????? 
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int fileLength = (int)inFile.length(); //取得文件的大小 ??ms??????  
int value; //取得要分割的个数 H_s????n  
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RandomAccessFile inn = new RandomAccessFile(inFile,"r");//打开要分割的文件 ????I????  
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value = fileLength/size; a??姝$vi  
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int i=0; 9t??F??铉  
int j=0; ???H????  
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//根据要分割的数目输出文件 昃??X??[  
for (;j File outFile = new File(inFile.getName()+j+"zzii"); ????)p??? 
RandomAccessFile outt= new RandomAccessFile(outFile,"rw"); N?2wK沈?  
maxx+=size; 豸 ???6??  
for (;i outt.write(inn.read()); 3?G??k|1? 
} 卫???S?? 
outt.close(); {eU???’贳  
} D???"??? 
File outFile = new File(inFile.getName()+j+"zzii"); 耕m??瀵 廪? 
RandomAccessFile outt= new RandomAccessFile(outFile,"rw"); Z`?/O????  
for(;i >?sf?  
outt.write(inn.read()); n穹)?遴   
} ?B乜???? 
outt.close(); J???|x2??  
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inn.close(); }??kA棹??  
} 劝0清????  
} ~?Wī  
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class He{ _h湄?????  
String fileName; N<K陡x?Q? 
String filterName; ???In?<? 
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He(String fileName,String filterName){ DP?????? 
this.fileName = fileName; #"=z??T?  
this.filterName = filterName; 锔q??亡A? 
} Z樗??????  
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public void unite()throws Exception{ ??’J??A7  
String [] tt; _7-:’?? 
File inFile = new File("."); //在当前目录下的文件 ?y?YvZWd  
File outFile = new File(fileName); //取得输出名 w醯U????? 
RandomAccessFile outt= new RandomAccessFile(outFile,"rw"); ??(????y?  
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//取得符合条件的文件名 g?巷A??z  
tt = inFile.list(new FilenameFilter(){ ????舔蜢  
public boolean accept(File dir,String name){ r耜;?????  
String rr = new File(name).toString(); C?????Y  
return rr.endsWith(filterName); ??Ryb沌??  
} T??????o  
}); ??褒a??  
//打印出取得的文件名 轾??-{YD  
for (int i = 0;i System.out.println(tt); ???WE弼?  
} ??N??6#?  
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//打开所有的文件再写入到一个文件里 ?j4:?]Q??  
for(int i=0;i inFile = new File(tt); ???"0?Pr  
RandomAccessFile inn= new RandomAccessFile(inFile,"r"); G??ngm??  
int c; 呵Gj??Z? 
while((c=inn.read())!=-1) 3???DZ  
outt.write(c); #U??]洙 Su  
} ????馘?ǎ  
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outt.close(); 巅e?????? 
} l+],酞e  
} 0?.???? 
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public class test{ ??yT??n>  
public static void main(final String [] args)throws Exception{ Ⅱm?eo??  
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if(args.length==0){ TKㄩp?)  
print(); ク????  
return; ??励??BB?  
} g?4??q??  
if(args[0].equals("-c")){ 蠢????Y? 
Fen cutt = new Fen(args[1],args[2]); L????J??  
cutt.cut(); ?lt;? L??放  
} Asf; 煌] ? 
else if (args[0].equals("-r")){ 0ヲ9??????  
He hee = new He(args[1],args[2]); ZZMé???  
hee.unite(); ????7;^*i  
} ??a??????
 
else #si?????  
print();  B.??<<%  
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} 5憝C.M???  
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public static void print(){ p咚??>c??? 
System.o

 ut.println("usage:\n分: java test -c file1 size(单位为K)\n合 java test -r file2 zzii(我设置的方便标识)"); 4"f%ov??? 
} ??o??mN?}  
}