Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

JavaʵÏÖÎļþ¿½±´µÄ4ÖÖ·½·¨

ʹÓà java ½øÐÐÎļþ¿½±´ ÏàÐźܶàÈ˶¼»áÓÃ,,²»¹ýЧÂÊÉÏÊÇ·ñ×îºÃÄØ?
×î½ü¿´ÁË¿´NIO¾ö¶¨ÊÔÒ»ÊÔ java  NIO µ½µ×ÓÐʲôÐÔÄܵÄÌáÉý.
µÚÒ»ÖÖ·½·¨:¹ÅÀϵķ½Ê½
 public static long forJava(File f1,File f2) throws Exception{
  long time=new Date().getTime();
  int length=2097152;
  FileInputStream in=new FileInputStream(f1);
  FileOutputStream out=new FileOutputStream(f2);
  byte[] buffer=new byte[length];
  while(true){
   int ins=in.read(buffer);
   if(ins==-1){
    in.close();
    out.flush();
    out.close();
    return new Date().getTime()-time;
   }else
    out.write(buffer,0,ins);
  }
 }
·½·¨µÄ2²ÎÊý·Ö±ðÊÇԭʼÎļþ,ºÍ¿½±´µÄÄ¿µÄÎļþ.ÕâÀï²»×ö¹ý¶à½éÉÜ.
ʵÏÖ·½·¨ºÜ¼òµ¥,·Ö±ð¶Ô2¸öÎļþ¹¹½¨ÊäÈëÊä³öÁ÷,²¢ÇÒʹÓÃÒ»¸ö×Ö½ÚÊý×é×÷ΪÎÒÃÇÄÚ´æµÄ»º´æÆ÷, È»ºóʹÓÃÁ÷´Óf1 ÖжÁ³öÊý¾Ýµ½»º´æÀï,ÔÚ½«»º´æÊý¾Ýдµ½f2ÀïÃæÈ¥.ÕâÀïµÄ»º´æÊÇ2MBµÄ×Ö½ÚÊý×é
µÚ2ÖÖ·½·¨:ʹÓÃNIOÖеĹܵÀµ½¹ÜµÀ´«Êä
    public static long forTransfer(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();
        int i=0;
        while(true){
            if(inC.position()==inC.size()){
                inC.close();
                outC.cl


Ïà¹ØÎĵµ£º

javaÖеķ´Éä»úÖÆ

Ò»¡¢Ê²Ã´ÊÇ·´É䣺
·´ÉäµÄ¸ÅÄîÊÇÓÉSmithÔÚ1982ÄêÊ×´ÎÌá³öµÄ£¬Ö÷ÒªÊÇÖ¸³ÌÐò¿ÉÒÔ·ÃÎÊ¡¢¼ì²âºÍÐÞ¸ÄËü±¾Éí״̬»òÐÐΪµÄÒ»ÖÖÄÜÁ¦¡£ÕâÒ»¸ÅÄîµÄÌá³öºÜ¿ìÒý·¢Á˼ÆËã»ú¿ÆÑ§ÁìÓò¹ØÓÚÓ¦Ó÷´ÉäÐÔµÄÑо¿¡£ËüÊ×Ïȱ»³ÌÐòÓïÑÔµÄÉè¼ÆÁìÓòËù²ÉÓÃ,²¢ÔÚLispºÍÃæÏò¶ÔÏó·½ÃæÈ¡µÃÁ˳ɼ¨¡£ÆäÖÐLEAD/LEAD++ ¡¢OpenC++ ¡¢MetaXaºÍOpenJavaµÈ¾ÍÊÇ»ùÓÚ·´ ......

java±àÂëת»»

³£¼ûµÄJAVA³ÌÐò°üÀ¨ÒÔÏÂÀà±ð£º
*Ö±½ÓÔÚconsoleÉÏÔËÐеÄÀà(°üÀ¨¿ÉÊÓ»¯½çÃæµÄÀà)
*JSP´úÂëÀࣨע£ºJSPÊÇServletsÀàµÄ±äÐÍ£©
*ServeletsÀà
*EJBÀà
*ÆäËü²»¿ÉÒÔÖ±½ÓÔËÐеÄÖ§³ÖÀà
 
ÕâЩÀàÎļþÖУ¬¶¼ÓпÉÄܺ¬ÓÐÖÐÎÄ×Ö·û´®£¬²¢ÇÒ³£ÓÃǰÈýÀàJAVA³ÌÐòºÍÓû§Ö±½Ó½»»¥£¬ÓÃÓÚÊä³öºÍÊäÈë×Ö·û£¬È磺ÔÚJSPºÍServletÖеõ½¿Í»§ ......

»ù´¡ JAVA³ÌÐò


1.±à³Ì½ç×îÖøÃûµÄÒ»¾ä»°“Hello world!”,ÈκÎÒ»¸ö³ÌÐòÔ±Æð²½Ê±±ØÓöµÄÓï¾ä
public class HelloWorld {

public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.print("Hello World!");
......

java¶þ·Ö²éÕÒ

¶þ·Ö²éÕÒ£º
   ¶þ·Ö²éÕÒ±ÈÏßÐÔ²éÕÒÊý¶ÈÒªºÃºÜ¶à£¬ÓÈÆäÊǶԴóÊý×éÀ´Ëµ¸üΪÏÔÖø£¬¾ÍÏñÊDzÂ×ÖÓÎÏ·Ò»Ñù
²Â×ÖÓÎÏ·£º
   ¶þ·Ö²éÕҵķ½·¨ºÍÎÒÃÇСʱºòÍæµÄ²Â×ÖÓÎÏ·ÊÇÒ»ÑùµÄ¡£ÔÚÕâ¸öÓÎÏ·ÀïÃæ£¬ÓÐÒ»¸öСÅóÓÑ»áÈÃÄã²ÂËýÕýÔÚÏëµÄÒ»¸ö1ÖÁ100Ö®¼äµÄÊý£¬
Äã²ÂÁËÒ»¸öÊýÒÔºó£¬Ëý»á¸æËßÄãÈýÖÖÑ¡ÔñÖеÄÒ»¸ö£ºÄã² ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ