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

  [root@akuilinux01 src]# tar zxvf jdk-8u171-linux-x64.tar.gz
  [root@akuilinux01 src]# mv jdk1.8.0_171/ /usr/local/jdk1.8

• 设置环境变量

  [root@akuilinux01 src]# 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
  [root@akuilinux01 src]# 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

  [root@akuilinux01 src]# cd /usr/local/src/
  [root@akuilinux01 src]# wget http://apache.fayea.com/tomcat/tomcat-8/v8.5.20/bin/apache-tomcat-8.5.20.tar.gz
  [root@akuilinux01 src]# tar zxvf apache-tomcat-8.5.31.tar.gz

• 移动并启动

  [root@akuilinux01 src]# mv apache-tomcat-8.5.31 /usr/local/tomcat
  [root@akuilinux01 src]# /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.
  [root@akuilinux01 src]# ps aux |grep java
  root      3304 56.0  5.4 4058116 101556 pts/0  Sl   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      3355  0.0  0.0 112676   984 pts/0    S+   21:56   0:00 grep --color=auto 

• tomcat不支持restart,关闭命令为下

  [root@akuilinux01 src]# /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
  [root@akuilinux01 src]# ps aux |grep java
  root      3391  0.0  0.0 112676   984 pts/0    S+   21:57   0:00 grep --color=auto java

• 监听的端口

  [root@akuilinux01 ~]# 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

  [root@akuilinux01 ~]# systemctl stop firewalld
  [root@akuilinux01 ~]# systemctl disable firewalld
  [root@akuilinux01 ~]# 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)