玻璃杯中的花生壳--用Java简单实现文件分割与合并

[代码]用Java简单实现文件分割与合并

[ 2006/8/22 16:25:47 | By: 玻璃杯中的花生壳 ]

主要应用IO的RandomAccessFile(听说断点续传也是用它实现) 　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 (;j<value;j++){ File outFile = new File(inFile.getName()+j+"zzii"); RandomAccessFile outt= new RandomAccessFile(outFile,"rw"); maxx+=size; for (;i<maxx;i++){ outt.write(inn.read()); } outt.close(); } File outFile = new File(inFile.getName()+j+"zzii"); RandomAccessFile outt= new RandomAccessFile(outFile,"rw"); for(;i<fileLength;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("."); //在当前目录下的文件 File outFile = new File(fileName); //取得输出名 RandomAccessFile& bsp;outt= new RandomAccessFile(outFile,"rw"); //取得符合条件的文件名 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<tt.length;i++){ System.out.println(tt[i]); } //打开所有的文件再写入到一个文件里 for(int i=0;i<tt.length;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(单位为K)\n合 java test -r file2 zzii(我设置的方便标识)");}}

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