1:查看java

安裝好的CentOS會自帶OpenJdk,用命令 java -version ，會有下面的信息：

[zhoujifeng@gz1-cdc-01 ~]$ java -version java version "1.7.0_45" OpenJDK Runtime Environment (rhel-2.4.3.3.el6-x86_64 u45-b15) OpenJDK 64-Bit Server VM (build 24.45-b08, mixed mode)
2:查看安裝的jdk

[root@gz1-cdc-01 ~]# rpm -qa | grep java java-1.7.0-openjdk-1.7.0.45-2.4.3.3.el6.x86_64 java-1.6.0-openjdk-1.6.0.0-1.66.1.13.0.el6.x86_64 tzdata-java-2013g-1.el6.noarch
3:卸載

[root@gz1-cdc-01 ~]# rpm -e --nodeps java-1.6.0-openjdk-1.6.0.0-1.66.1.13.0.el6.x86_64 [root@gz1-cdc-01 ~]# rpm -qa | grep java java-1.7.0-openjdk-1.7.0.45-2.4.3.3.el6.x86_64 tzdata-java-2013g-1.el6.noarch [root@gz1-cdc-01 ~]# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.45-2.4.3.3.el6.x86_64 [root@gz1-cdc-01 ~]# java -version java version "1.7.0_45" Java(TM) SE Runtime Environment (build 1.7.0_45-b18) Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)

4：設置Tomcat開機啟動

vi /etc/rc.d/rc.local?

在最后加

export JDK_HOME=/usr/jdk1.7.0_45
export JAVA_HOME=/usr/jdk1.7.0_45
/usr/tomcat/bin/startup.sh

[zhoujifeng@gz1-cdc-01 ~]$ cat /etc/rc.d/rc.local #!/bin/sh # # This script will be executed *after* all the other init scripts. # You can put your own initialization stuff in here if you don't # want to do the full Sys V style init stuff.touch /var/lock/subsys/local export JDK_HOME=/usr/jdk1.7.0_45 export JAVA_HOME=/usr/jdk1.7.0_45 /usr/tomcat/bin/startup.sh

總結

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