java ʹÓÃÏà¶Ô·¾¶¶ÁÈ¡Îļþ
http://www.blogjava.net/flysky19/articles/93492.html
1.java project»·¾³£¬Ê¹ÓÃjava.ioÓÃÏà¶Ô·¾¶¶ÁÈ¡ÎļþµÄÀý×Ó£º
*Ŀ¼½á¹¹£º
DecisionTree
|___src
|___com.decisiontree.SamplesReader.java
|___resource
|___train.txt,test.txt
*SamplesReader.java:
String filepath="resource/train.txt";//×¢ÒâfilepathµÄÄÚÈÝ£»
File file=new File(filepath);
……
*ÎÒÃÇÁôÒâfilepathµÄÄÚÈÝ£¬java.ioĬÈ϶¨Î»µ½µ±Ç°Óû§Ä¿Â¼("user.dir")Ï£¬¼´£º¹¤³Ì¸ùÄ¿
¼"D:\DecisionTree"Ï£¬Òò´Ë£¬´ËʱµÄÏà¶Ô·¾¶(ÒÔuser.dirΪ»ù·¾¶µÄ·¾¶)Ϊ"resource/train.txt"
¡£ÕâÑù£¬JVM¾Í¿ÉÒÔ¸ù¾Ý"user.dir"Óë"resource/train.txt"µÃµ½ÍêÕûµÄ·¾¶£¨¼´¾ø¶Ô·
¾¶£©"D:\DecisionTree\resource\train.txt"£¬´ÓÀ´ÕÒµ½train.txtÎļþ¡£
*×¢Ò⣺Ïà¶Ô·¾¶µÄÆðʼ´¦ÎÞб¸Ë"/";ÀýÈ磺
filepath="resource/train.txt";
¶ø²»ÊÇfilepath="/resource/train.txt"; //error!
2¡¢javaEE»·¾³£¬Ê¹ÓÃClassloaderÓÃÏà¶Ô·¾¶¶ÁÈ¡xmlµÄÀý×Ó£º
*²Î¼û֮ǰдµÄÎÄÕ“ͨ¹ýÐéÄâ·¾¶»òÏà¶Ô·¾¶¶ÁÈ¡Ò»¸öxmlÎļþ£¬±ÜÃâÓ²±àÂ딡£
*ÄÚÈÝÈçÏ£º
javaʹÓÃÏà¶Ô·¾¶¶ÁÈ¡xmlÎļþ£º
Ò»¡¢xmlÎļþÒ»°ãµÄ´æ·ÅλÖÃÓÐÈý¸ö£º
1.·ÅÔÚWEB-INFÏ£»
2.xmlÎļþ·ÅÔÚ/WEB-INF/classesĿ¼Ï»òclasspathµÄjar°üÖУ»
3.·ÅÔÚÓë½âÎöËüµÄjavaÀàͬһ¸ö°üÖУ¬²»Ò»¶¨ÊÇclasspath£»
¶þ¡¢Ïà¶ÔÓ¦µÄÁ½ÖÖʹÓÃÏà¶Ô·¾¶µÄ¶ÁÈ¡·½·¨£º
·½·¨Ò»£º£¨Î´ÑéÖ¤£©
½«xmlÎļþ·ÅÔÚWEB-INFĿ¼Ï£¬È»ºó
³ÌÐò´úÂ룺
InputStream is=getServletContext().getResourceAsStream( "/WEB-INF/xmlfile.xml" );
·½·¨¶þ£º½«xmlÎļþ·ÅÔÚ/WEB-INF/classesĿ¼Ï»òclasspathµÄjar°üÖУ¬Ôò¿ÉÒÔʹÓÃClassLoaderµÄ¾²Ì¬
·½·¨getSystemResourceAsStream(String s)¶ÁÈ¡£»
³ÌÐò´úÂ룺
String s_xmlpath="com/spf/web/ext/hotspot/hotspotxml/hotspot.xml";
InputStream in=ClassLoader.getSys
Ïà¹ØÎĵµ£º
=====================================
Ç°ÑÔ
ÔÚÌ«Ô¾ÀúÁËÒ»ÄêµÄÍ´¿à¿ª·¢Ö®ºó£¬ÏîÄ¿ÒѾÈÕÇ÷Îȶ¨£¬½ÓÏÂÀ´µÄ¹¤×÷¾ÍÊÇÄÃÏÖÓеĴúÂëµ½ÆäËûµÄÊ¡ÊнøÐÐʵʩ¡¢È»ºó×öһЩ±¾µØ»¯¿ª·¢¡£ÈÕ×ÓÏà¶ÔÇáËÉÁËÐí¶à£¬ÓÚÊÇ¿ÉÒÔ³é³öʱ¼äÀ´ÎÂϰһϻù´¡µÄ¼¼Êõ֪ʶ£¬¸ø×Ô¼ºÁÐÁËÒ»¸ö¸´Ï°Ìá¸Ù£¬ÕâÒ²ÊÇÒ»¸öjava³ÌÐòÔ±ËùÓ¦¸ÃÕÆÎÕµÄ֪ʶÂöÂç¡£
=== ......
java.io.InputStreamµÄread()·½·¨ÃèÊö£º
If no byte is available because the end of the stream has been reached, the value -1 is returned.
µ½´ïÁ÷µÄĩβÕæ»á·Å»Ø-1Âð£¿
......
¡¶Java³ÌÐòͨ¹ýwekaµ÷ÓÃlibsvmµÄ·½·¨¡·Ò»ÎIJûÊöÁ˵÷ÓÃLibSVMµÄ¼òµ¥·½·¨£¬ÕâÀïÖ÷Òª²¹³äËĵ㣺
1. LibSVMÔÚweka3.5°æÒԺ󶼼¯³ÉÁË°ü×°£¬ÎÞÐëÔÙʹÓÃWLSVM£¬ËùÒÔÉÏÎÄÖеÄWLSVMÏà¹ØµÄÄÚÈÝ¿ÉÒÔÈ¥³ý£¬¶øÀàÐÍWLSVM¿ÉÒÔ»»³ÉLibSVM£¬ÐèÒªÌí¼Ó°ü
import weka.classifiers.functions.LibSVM;
ÎÞ ......
ͨ¹ýjava.awt.RobotµÄcreateScreenCapture½ØÆÁ¡£
public static void captureScreen(String fileName) throws Exception {
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Rectangle screenRectangle = new Rectangle(screenSize);
& ......
JavaÐéÄâ»úµÄÄÚ²¿Ìåϵ½á¹¹Ò²ÐíºÜÉÙÓÐÈËÈ¥¹ØÐÄ£¬ÒòΪ¶ÔÓÚJava³ÌÐòÔ±À´Ëµ£¬Ò»°ãÖ»ÐèÒª¸úAPI´ò½»µÀ¾Í¿ÉÒÔÁË¡£ÕâЩÌåϵ½á¹¹Ö»ÊÇJavaÐéÄâ»úÄÚ²¿µÄ½á¹¹¶øÒÑ¡£µ«ÊÇÈç¹ûÀí½âÁËÆäÄÚ²¿½á¹¹£¬¶ÔÓÚÎÒÃÇ¿ª·¢ÏîÄ¿£¬ÒÔ¼°ÅųýϵͳÖеÄÏà¹Ø¹ÊÕÏÊÇÓÉ°ïÖúµÄ¡£
ÏÈ¿´¿´×ÜÌå½á¹¹Í¼£¬ÈçÏ£º
¸÷²¿·ÖµÄÖ÷Òª¹¦ÄÜ·Ö±ðÊÇ£º
1. Àà×°ÔØ×Óϵͳ:¸ºÔðJavaÀ ......