文件生成(做测试时使用)

public class test {
/** * @param args * @throws Exception */ public static void main(String[] args) throws Exception { // TODO Auto-generated method stub File f = new File("c:\\aa.pdf"); for(int i=0;i<1100;i++) { File n = new File("c:\\pdf\\REPORT_1306460911500"+i+".pdf"); forChannel(f,n); } } public static long forChannel(File f1,File f2) throws Exception{ long time=new Date().getTime(); int length=2097152; FileInputStream in=new FileInputStream(f1); FileOutputStream out=new FileOutputStream(f2); FileChannel inC=in.getChannel(); FileChannel outC=out.getChannel(); ByteBuffer b=null; while(true){ if(inC.position()==inC.size()){ inC.close(); outC.close(); return new Date().getTime()-time; } if((inC.size()-inC.position())<length){ length=(int)(inC.size()-inC.position()); }else length=2097152; b=ByteBuffer.allocateDirect(length); inC.read(b); b.flip(); outC.write(b); outC.force(false); } }}