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  • java 文件 拷贝 file copy 管道对管道 速度最快

    管道对管道的文件拷贝

        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);
            }
        }
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  • 原文地址:https://www.cnblogs.com/kevinge/p/2076325.html
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