Linux（CentOS7.2）下安装JDK及Tomcat

一、下载相关软件

JDK：http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
Tomcat：http://mirrors.shuosc.org/apache/tomcat/tomcat-9/v9.0.2/bin/apache-tomcat-9.0.2.tar.gz

二、安装与配置JDK

[root@JDK-Tomcat ~]# rpm -ivh jdk-8u151-linux-x64.rpm 

在/etc/profile中加入以下三行：

[root@JDK-Tomcat ~]# vi /etc/profile
export JAVA_HOME=/usr/java/jdk1.8.0_151
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar:$CLASSPATH

查看一下安装详情。

[root@JDK-Tomcat ~]# java -version
java version "1.8.0_151"
Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)

三、安装与配置Tomcat

1、下载安装Tomcat。

[root@JDK-Tomcat ~]# wget -c http://mirrors.shuosc.org/apache/tomcat/tomcat-9/v9.0.2/bin/apache-tomcat-9.0.2.tar.gz
[root@JDK-Tomcat ~]# tar -xzvf apache-tomcat-9.0.2.tar.gz 
[root@JDK-Tomcat ~]# mkdir /usr/local/tomcat
[root@JDK-Tomcat ~]# mv apache-tomcat-9.0.2 /usr/local/tomcat/
[root@JDK-Tomcat ~]# cd /usr/local/tomcat/apache-tomcat-9.0.2/

2、修改配置系统设置，启动Tomcat。

[root@JDK-Tomcat apache-tomcat-9.0.2]# vi /etc/profil
export TOMCAT_HOME=/usr/local/tomcat/apache-tomcat-9.0.2/
[root@JDK-Tomcat bin]# source /etc/profile
[root@JDK-Tomcat bin]# ./catalina.sh start
Using CATALINA_BASE:   /usr/local/tomcat/apache-tomcat-9.0.2
Using CATALINA_HOME:   /usr/local/tomcat/apache-tomcat-9.0.2
Using CATALINA_TMPDIR: /usr/local/tomcat/apache-tomcat-9.0.2/temp
Using JRE_HOME:        /usr/java/jdk1.8.0_151
Using CLASSPATH:       /usr/local/tomcat/apache-tomcat-9.0.2/bin/bootstrap.jar:/usr/local/tomcat/apache-tomcat-9.0.2/bin/tomcat-juli.jar
Tomcat started.

在浏览器输入服务器IP地址，默认端口8080，看是否出现以下页面：

如出现上图所示，则说明安装成功！
4、停止Tomcat，进一步修改配置。

[root@JDK-Tomcat bin]# ./shutdown.sh 
Using CATALINA_BASE:   /usr/local/tomcat/apache-tomcat-9.0.2
Using CATALINA_HOME:   /usr/local/tomcat/apache-tomcat-9.0.2
Using CATALINA_TMPDIR: /usr/local/tomcat/apache-tomcat-9.0.2/temp
Using JRE_HOME:        /usr/java/jdk1.8.0_151
Using CLASSPATH:       /usr/local/tomcat/apache-tomcat-9.0.2/bin/bootstrap.jar:/usr/local/tomcat/apache-tomcat-9.0.2/bin/tomcat-juli.jar

1、修改默认监听端口，例如：将8080端口修改为80，把配置文件中的8080替换为80即可。启动Tomcat去掉端口号查看。

[root@JDK-Tomcat bin]# vim /usr/local/tomcat/apache-tomcat-9.0.2/conf/server.xml
:1,$s/8080/80/

2、修改字符编码。在如图所示部分加入高亮部分代码，保存退出，重启Tomcat。

3、设置Tomcat开机自启动。
在/usr/local/tomcat/apache-tomcat-9.0.2/bin/startup.sh的尾部新增如下四行，保存退出！

export JAVA_HOME=/usr/java/jdk1.8.0_151
export CLASSPATH=$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar:.
export PATH=$JAVA_HOME/bin
export CATALINA_HOME=/usr/local/tomcat/apache-tomcat-9.0.2/bin/catalina.sh start

编辑/etc/rc.d/rc.local配置文件。加入如下一行，保存退出！

/usr/local/tomcat/apache-tomcat-9.0.2/bin/startup.sh

给/etc/rc.d/rc.local加上执行权限，这个很重要，别忘了！否则不会执行！

[root@JDK-Tomcat ~]# chmod u+x /etc/rc.d/rc.local 

4、优化。在/usr/local/tomcat/apache-tomcat-9.0.2/bin/catalina.sh新增如下一行：

JAVA_OPTS="-XX:MaxPermSize=192M -Xms1000M -Xmx2000M"

关闭服务器，重启观察是否正常开机自启动？