CentOS 6 安装配置JDK+tomcat环境

1.安装OpenJDK

这里安装的OpenJDK，是开源版本的JDK，我们平时自己电脑上安装的是 Sun JDK(也叫Oracle JDK），OpenJDK可以看作Sun JDK的精简版。
如果想安装SunJDK，请参照下方的tomcat安装方法，步骤是一样的，注意liunx有些自带OpenJDK，需卸载。

注意，安装OpenJDK简单迅速，只需一条命令，且无需配置环境变量

①查看是否已经安装了JDK

java -version
rpm -qa |grep java 
rpm -qa |grep jdk 

②若有如何卸载

卸载JDK相关文件输入：

yum -y remove java-1.8.0-openjdk*

卸载tzdata-java输入：

yum -y remove tzdata-java.noarch

③安装

yum list java* #查看版本

yum list java-1.8* #查看1.8版本

yum install java-1.8.0-openjdk* -y # 安装

执行:

[root@localhost ~]# yum -y install java-1.8.0-openjdk*
Loaded plugins: fastestmirror
Setting up Install Process
Loading mirror speeds from cached hostfile
* base: repos-lax.psychz.net
* elrepo-kernel: repos.lax-noc.com
* extras: repos-lax.psychz.net
* updates: mirrors.oit.uci.edu
Resolving Dependencies
--> Running transaction check
---> Package java-1.8.0-openjdk.i686 1:1.8.0.191.b12-0.el6_10 will be installed
...

Complete!

④检查安装结果

[root@localhost ~]# java -version
openjdk version "1.8.0_191"
OpenJDK Runtime Environment (build 1.8.0_191-b12)
OpenJDK Server VM (build 25.191-b12, mixed mode)

执行java和javac,正常,无需配置环境变量

3.安装tomcat

①去官网下载安装包

https://tomcat.apache.org/download-90.cgi
这里我下的是9.0的版本

②上传至服务器然后解压

这里我用的FileZilla 上传到ftp账户里

[root@localhost ftpuser]# ls
222  apache-tomcat-9.0.13.tar.gz  dir1-0  dir1-1

然后复制此文件到/usr/local/tomcat/目录下

tomcat目录为自己创建，安装对路径并无要求

[root@localhost ftpuser]# cp apache-tomcat-9.0.13.tar.gz /usr/local/tomcat/
[root@localhost ftpuser]# cd /usr/local/tomcat
[root@localhost tomcat]# ls
apache-tomcat-9.0.13.tar.gz

进入文件所在目录解压即可

[root@localhost tomcat]# tar zxvf apache-tomcat-9.0.13.tar.gz

③启动tomcat

[root@localhost tomcat]# cd apache-tomcat-9.0.13/bin
[root@localhost bin]# ./startup.sh
Using CATALINA_BASE:   /usr/local/tomcat/apache-tomcat-9.0.13
Using CATALINA_HOME:   /usr/local/tomcat/apache-tomcat-9.0.13
Using CATALINA_TMPDIR: /usr/local/tomcat/apache-tomcat-9.0.13/temp
Using JRE_HOME:        /usr
Using CLASSPATH:       /usr/local/tomcat/apache-tomcat-9.0.13/bin/bootstrap.jar:/usr/local/tomcat/apache-tomcat-9.0.13/bin/tomcat-juli.jar
Tomcat started.

关闭防火墙或者开放端口后，即可用任意一台设备访问tomcat

开启端口
[root@localhost ~]# /sbin/iptables -I INPUT -p tcp –dport 8080 -j ACCEPT #开启8080端口 
[root@localhost ~]# /etc/rc.d/init.d/iptables save #保存配置 
[root@localhost ~]# /etc/rc.d/init.d/iptables restart #重启防火墙
关闭防火墙
service iptables stop #暂时关闭
chkconfig iptables off #设置成开启不自启

如我在自己电脑的浏览器输入 服务器ip:8080

④查看tomcat版本

[root@localhost bin]# ./catalina.sh version
Using CATALINA_BASE:   /usr/local/tomcat/apache-tomcat-9.0.13
Using CATALINA_HOME:   /usr/local/tomcat/apache-tomcat-9.0.13
Using CATALINA_TMPDIR: /usr/local/tomcat/apache-tomcat-9.0.13/temp
Using JRE_HOME:        /usr
Using CLASSPATH:       /usr/local/tomcat/apache-tomcat-9.0.13/bin/bootstrap.jar:/usr/local/tomcat/apache-tomcat-9.0.13/bin/tomcat-juli.jar
Server version: Apache Tomcat/9.0.13
Server built:   Nov 2 2018 14:27:55 UTC
Server number:  9.0.13.0
OS Name:        Linux
OS Version:     4.10.4-1.el6.elrepo.i686
Architecture:   i386
JVM Version:    1.8.0_191-b12
JVM Vendor:     Oracle Corporation
[root@localhost bin]# 

⑤关闭tomcat

查看tomcat是否运行

ps -ef | grep tomcat
[root@localhost bin]# ps -ef | grep tomcat
root      6975  6663  0 11:43 pts/1    00:00:00 grep tomcat

关闭tomcat（执行shutdown.sh脚本）

[root@localhost apache-tomcat-9.0.13]# cd bin
[root@localhost bin]# ./shutdown.sh
Using CATALINA_BASE:   /usr/local/tomcat/apache-tomcat-9.0.13
Using CATALINA_HOME:   /usr/local/tomcat/apache-tomcat-9.0.13
Using CATALINA_TMPDIR: /usr/local/tomcat/apache-tomcat-9.0.13/temp
Using JRE_HOME:        /usr
Using CLASSPATH:       /usr/local/tomcat/apache-tomcat-9.0.13/bin/bootstrap.jar:/usr/local/tomcat/apache-tomcat-9.0.13/bin/tomcat-juli.jar

⑥卸载tomcat

直接删除安装目录

rm -rf /usr/local/tomcat/apache-tomcat-9.0.13