tomcat介绍，jdk,tomcat安装
tomcat介绍[*]Tomcat是Apache软件基金会（Apache Software Foundation）的Jakarta项目中的一个核心项目，由Apache、Sun和其他一些公司及个人共同开发而成。
[*]java程序写的网站用tomcat+jdk来运行
[*]tomcat是一个中间件，真正起作用的，解析java脚本的是jdk
[*]jdk（java development kit）是整个java的核心，它包含了java运行环境和一堆java相关的工具以及java基础库。
[*]最主流的jdk为sun公司发布的jdk，除此之外，其实IBM公司也有发布JDK，CentOS上也可以用yum安装openjdk
jdk安装
[*]jdk版本1.6，1.7，1.8
[*]官网下载地址 http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
[*]下载jdk8，放到/usr/local/src/目录下，（先下载到电脑再使用xftp5传输）
[*]解压并移动到/usr/local/jdk1.8
# tar zxvf jdk-8u171-linux-x64.tar.gz
# mv jdk1.8.0_171/ /usr/local/jdk1.8
[*]设置环境变量
# vim /etc/profile
AVA_HOME=/usr/local/jdk1.8/
JAVA_BIN=/usr/local/jdk1.8/bin
JRE_HOME=/usr/local/jdk1.8/jre
PATH=$PATH:/usr/local/jdk1.8/bin:/usr/local/jdk1.8/jre/bin
CLASSPATH=/usr/local/jdk1.8/jre/lib:/usr/local/jdk1.8/lib:/usr/local/jdk1.8/jre/lib/charsets.jar
[*]source并验证
root@akuilinux01 src]# source /etc/profile
# java -version
java version "1.8.0_171"
Java(TM) SE Runtime Environment (build 1.8.0_171-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode)
[*]如果和你安装的版本不一样，可以查看是不是安装过其他版本的jdk，可以卸载其他版本的包，在线上的机器别轻易卸载，可能有些服务用到。
tomcat安装
[*]下载并解压二进制包
# cd /usr/local/src/
# wget http://apache.fayea.com/tomcat/tomcat-8/v8.5.20/bin/apache-tomcat-8.5.20.tar.gz
# tar zxvf apache-tomcat-8.5.31.tar.gz
[*]移动并启动
# mv apache-tomcat-8.5.31 /usr/local/tomcat
# /usr/local/tomcat/bin/startup.sh
Using CATALINA_BASE: /usr/local/tomcat
Using CATALINA_HOME: /usr/local/tomcat
Using CATALINA_TMPDIR: /usr/local/tomcat/temp
Using JRE_HOME: /usr/local/jdk1.8
Using CLASSPATH: /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar
Tomcat started.
# ps aux |grep java
root 3304 56.05.4 4058116 101556 pts/0Sl 21:55 0:13 /usr/local/jdk1.8/bin/java -Djav.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar -Dcatalina.base=/usr/local/tomcat -Dcatalina.home=/usr/local/tomcat -Djava.io.tmpdir=/usr/local/tomcat/temp org.apache.catalina.startup.Bootstrap start
root 33550.00.0 112676 984 pts/0 S+ 21:56 0:00 grep --color=auto
[*]tomcat不支持restart,关闭命令为下
# /usr/local/tomcat/bin/shutdown.sh
Using CATALINA_BASE: /usr/local/tomcat
Using CATALINA_HOME: /usr/local/tomcat
Using CATALINA_TMPDIR: /usr/local/tomcat/temp
Using JRE_HOME: /usr/local/jdk1.8
Using CLASSPATH: /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar
# ps aux |grep java
root 33910.00.0 112676 984 pts/0 S+ 21:57 0:00 grep --color=auto java
[*]监听的端口
# netstat -lntp |grep java
tcp6 0 0 :::8080 :::* LISTEN 3407/java
tcp6 0 0 127.0.0.1:8005 :::* LISTEN 3407/java
tcp6 0 0 :::8009 :::* LISTEN 3407/java
[*]三个端口8080为提供web服务的端口，8005为管理端口，8009端口为第三方服务调用的端口，比如httpd和Tomcat结合时会用到
[*]关闭防火墙就可以浏览器打开http://192.168.21.128:8080/，就可以看到tomcat的页面
# systemctl stop firewalld
# systemctl disable firewalld
# iptables -nvL
Chain INPUT (policy ACCEPT 14339 packets, 206M bytes)
pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 11657 packets, 1493K bytes)
pkts bytes target prot opt in out source destination
扩展
[*]java容器比较(
http://www.360doc.com/content/11/0618/21/16915_127901371.shtml)
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