day60:Tomcat及JDK介绍:

别等时光非礼了梦想. 提交于 2019-11-26 12:25:22

1、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。
Tomcat服务器是一个免费的开放源代码的Web应用服务器,属于轻量级应用服务器,在中小型系统和并发访问用户不是很多的场合下被普遍使用,实际上tomcat是apache的一个扩展,但运行时它是独立运行的,所有当运行tomcat时,它是作为一个与apache独立的进程单独运行的:

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是由sun公司发布的JDK,除此之外,IBM公司也有发布JDK,centos上也可以使用yum安装openjdk。

2、安装jdk:jdk常用版本有1.6  1.7  1.8:简称  6  7   8:本次我们使用的是8

需要打开官网地址http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html 

 手动下载到本机器,并借助xshell的rz工具上传到/usr/local/src目录下:如下:

[root@localhost_002 111.com]# cd /usr/local/src/
[root@localhost_002 src]# ls jdk-8u181-linux-x64.tar.gz 
jdk-8u181-linux-x64.tar.gz

解压: 

[root@localhost_002 src]# tar zxvf jdk-8u181-linux-x64.tar.gz

挪目录位置:

[root@localhost_002 src]# cp -r  jdk1.8.0_181/ /usr/local/jdk1.8
[root@localhost_002 src]# cd /usr/local/jdk1.8/
设置环境变量,在文本最下面添加如下内容:  vim   /etc/profile

[root@localhost_002 jdk1.8]#vim   /etc/profile
JAVA_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 
[root@localhost_002 jdk1.8]# source /etc/profile                #刷新配置生效

坚持jdk是否安装成功:  java   -version 

[root@localhost_002 jdk1.8]# java -version
java version "1.8.0_181"
Java(TM) SE Runtime Environment (build 1.8.0_181-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)

安装步骤

下载步骤略过:
[root@localhost_002 src]# tar zxvf jdk-8u181-linux-x64.tar.gz
[root@localhost_002 src]# cp -r  jdk1.8.0_181/ /usr/local/jdk1.8
[root@localhost_002 src]# cd /usr/local/jdk1.8/
[root@localhost_002 jdk1.8]# vim /etc/profile
JAVA_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 
[root@localhost_002 jdk1.8]# source /etc/profile    #刷新配置生效:


[root@localhost_002 jdk1.8]# java -version
java version "1.8.0_181"
Java(TM) SE Runtime Environment (build 1.8.0_181-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)

2、安装Tomcat:tomcat是一个中间件,真正起作用的是jdk,而访问80 需要有一个webserver,需要依赖jdk:

1:下载 wget http://apache.fayea.com/tomcat/tomcat-8/v8.5.33/bin/apache-tomcat-8.5.33.tar.gz

解压并挪目录

 tar zxvf apache-tomcat-8.5.33.tar.gz 
 mv apache-tomcat-8.5.33 /usr/local/tomcat

然后直接启动tomcat即可:   /usr/local/tomcat/bin/startup.sh

[root@localhost_002 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.

#详细安装步骤:
[root@localhost_002 src]# wget http://apache.fayea.com/tomcat/tomcat-8/v8.5.20/bin/apache-tomcat-8.5.20.tar.gz
[root@localhost_002 src]# tar zxvf apache-tomcat-8.5.33.tar.gz          #解压:
[root@localhost_002 src]# mv apache-tomcat-8.5.33 /usr/local/tomcat     #挪位置:
[root@localhost_002 tomcat]# /usr/local/tomcat/bin/startup.sh           #启动tomcat:
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.

2:查看tomcat是否启动ps   aux  |grep tomcat    : 有java字眼则启动了:

[root@localhost_002 tomcat]# ps aux |grep tomcat
root       1430  2.8  8.6 2294196 86696 pts/0   Sl   19:07   0:04 /usr/local/jdk1.8/bin/java -Djava.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       1478  0.0  0.0 112720   972 pts/0    R+   19:10   0:00 grep --color=auto tomcat

3:关闭tomcat,有时当修改了配置文件,需要先关闭在启动:

[root@localhost_002 tomcat]# /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

4:查看其监听的端口(8005) netstat  -lntp 

[root@localhost_002 tomcat]# netstat -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:52588           0.0.0.0:*               LISTEN      871/sshd            
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      1081/master         
tcp6       0      0 :::52588                :::*                    LISTEN      871/sshd            
tcp6       0      0 :::8080                 :::*                    LISTEN      1430/java           
tcp6       0      0 :::80                   :::*                    LISTEN      1212/httpd          
tcp6       0      0 ::1:25                  :::*                    LISTEN      1081/master         
tcp6       0      0 127.0.0.1:8005          :::*                    LISTEN      1430/java           
tcp6       0      0 :::8009                 :::*                    LISTEN      1430/java           
tcp6       0      0 :::3306                 :::*                    LISTEN      1094/mysqld 
[root@localhost_002 tomcat]# netstat -lntp |grep java
tcp6       0      0 :::8080                 :::*                    LISTEN      1528/java           
tcp6       0      0 127.0.0.1:8005          :::*                    LISTEN      1528/java           
tcp6       0      0 :::8009                 :::*                    LISTEN      1528/java           

然后我们发现java启动的端口有3个:     8080      8009    8005

8080:提供web服务的端口:

8005:为管理管理端口:

8009:为第三方服务调用的端口:比如httpd和tomcat结合时会使用:

 

 

 

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