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 Ò»¡¢ jdkµÄ°²×° 
 1. ÏÂÔØjdk£º ´Ówww.sun.comÏÂÔØjdk£¨ jdk-1_5_0_20-linux-i586-rpm.bin £©£¬ÏÂÔØºóʹÓÃsshÉÏ´«µ½linuxϵͳµÄhomeĿ¼Ï£¬µ±È»Ò²¿ÉÒÔ·ÅÔÚÆäËüĿ¼¡£
 2. ½øÈ밲װĿ¼,ÐÞ¸ÄjdkµÄʹÓÃȨÏÞ,¸øËùÓÐÓû§Ìí¼Ó¿ÉÖ´ÐеÄȨÏÞ£º
#cd /home
#chmod +x jdk-1_5_0_20-linux-i586.rpm.bin
(×¢£º Ò²¿ÉÓà chmod a+x jdk-6u2-linux -i586-rpm.bin
    a£ºAll£¬¼´È«²¿µÄÓû§£¬°üº¬ÓµÓÐÕߣ¬ËùÊôȺ×éÒÔ¼°ÆäËûÓû§
    x£ºÖ´ÐлòÇл»È¨ÏÞ£¬Êý×Ö´úºÅΪ"1"¡£ )
 3. ½âѹ²¢°²×°£º
#./jdk-1_5_0_20-linux-i586.rpm.bin (ĬÈϰ²×°ÔÚ/usr/javaÖУ¬./ÓëjdkÖ®¼äÎÞ¿Õ¸ñ)  
³öÏÖSUN¹«Ë¾°²×°Ð­Ò飬°´yes½ÓÊܼ´¿É¡£
´ËʱÔÚhomeĿ¼»áÉú³ÉÎļþjdk-1_5_0_20-linux-i586.rpm£¬Í¬Ñù¸øËùÓÐÓû§Ìí¼Ó¿ÉÖ´ÐеÄȨÏÞ:
#chmod +x jdk-1_5_0_20-linux-i586.rpm
 4. °²×°³ÌÐò£º
#rpm -ivh jdk-1_5_0_20-linux-i586.rpm
³öÏÖ°²×°Ð­ÒéµÈ£¬°´½ÓÊܼ´¿É¡£
 5. ÉèÖû·¾³±äÁ¿£º
#vi /etc/profile
ÔÚ×îºóÃæ¼ÓÈë
export JAVA_HOME=/usr/java/jdk1.5.0_20
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH
export CLASSPATH=$CLASSPATH:.:/JAVA_HOME/lib:$JAVA_HOME/jre/lib
export TOMCAT_HOME=/usr/local/tomcat
°´:wq±£´æÍ˳ö¡£
 6. ÊäÈë echo $JAVA_HOME ²é¿´JAVA_HOMEµÄÐÅÏ¢£º
[root@s197 ~]# echo $JAVA_HOME
/usr/java/jdk1.5.0_20
ÉÏÃæÏÔʾJAVA_HOMEÐÅÏ¢Õý³£¡£Ôٲ鿴java°æ±¾ÐÅÏ¢£º
[root@s197 ~]# java -version
java version "1.5.0_20"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_20-b02)
Java HotSpot(TM) Client VM (build 1.5.0_20-b02, mixed mode, sharing)
java°æ±¾ÐÅÏ¢Õý³££¬±íÃ÷jdkÕýÈ·°²×°¡£
¶þ¡¢jdkµÄÐ¶ÔØ£º
1. ×Ô´øµÄjdk£º
  ´ò¿ªÖÕ¶ËÊäÈë#rpm -qa | grep gcj £¬ÆäÏÔʾÄÚÈÝÓУº
  java-1.4.2-gci-compat.........
  java-1.4.2-gcj-compat-devel.....(¾ßÌåÍüÁËÊÇʲôÁË£¬·´ÕýÓÐÁ½¸öjava¿ªÍ·µÄÎļþ)
  2.Ð¶ÔØ
  #rpm -e --nodeps java-1.4.2-gci... (ÀûÓÃrpm -e --nodeps ÃüÁîɾ³ýÉÏÃæ²éÕÒµÄÄÚÈÝ)
´Ëʱjdk1.4Òѱ»Ð¶ÁË¡£
2. rpm°æµÄjdk£º
Ð¶ÔØrpm°æµÄjdk£º
    #rpm -qa|grep jdk
    ÏÔʾ£ºjdk-1.6.0_10-fcs
   


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