1. 发布java项目的步骤：

拉取代码并打包
mvn clean package
备份目标服务器上已有的要发布项目
将包传到目标服务器的webapss目录中
需做免密登录
重启目标服务器的tomcat服务
修改项目的配置
重启目标服务器的tomcat服务

2. 部署环境

项目要求:
两台主机上分别安装jenkins，tomcat

环境说明：

系统平台	IP	需要安装的服务
rhel-8.2	192.168.8.137	Jenkins
rhel-8.2	192.168.8.130	Tomcat

2.1 Tomcat部署

//安装jdk环境
[root@localhost ~]# yum -y install java-11-openjdk*

//下载tomcat
[root@localhost ~]# cd /usr/src/
[root@localhost src]# wget https://archive.apache.org/dist/tomcat/tomcat-9/v9.0.53/bin/apache-tomcat-9.0.53.tar.gz

//解压部署
[root@localhost src]# ls
apache-tomcat-9.0.53.tar.gz  debug  kernels
[root@localhost src]# tar xf apache-tomcat-9.0.53.tar.gz -C /usr/local/
[root@localhost src]# cd /usr/local/
[root@localhost local]# ln -s apache-tomcat-9.0.53/ tomcat

//使用service控制tomcat
[root@localhost ~]# cd /usr/lib/systemd/system
[root@localhost system]# cp sshd.service tomcat.service
[root@localhost system]# vim tomcat.service 
[root@localhost system]# cat tomcat.service 
[Unit]
Description=Tomcat server daemon
After=network.target sshd-keygen.target

[Service]
Type=forking
ExecStart=/usr/local/tomcat/bin/catalina.sh start
ExecStop=/usr/local/tomcat/bin/catalina.sh stop
ExecReload=/bin/kill -HUP $MAINPID

[Install]
WantedBy=multi-user.target
[root@localhost system]# systemctl daemon-reload 
[root@localhost system]# systemctl enable --now tomcat.service 
Created symlink /etc/systemd/system/multi-user.target.wants/tomcat.service → /usr/lib/systemd/system/tomcat.service.

[root@localhost system]# ss -antl
State                 Recv-Q                Send-Q                                    Local Address:P
LISTEN                0                     32                                        192.168.122.1:5
LISTEN                0                     128                                             0.0.0.0:2
LISTEN                0                     5                                             127.0.0.1:6
LISTEN                0                     128                                           127.0.0.1:6
LISTEN                0                     128                                             0.0.0.0:1
LISTEN                0                     100                                                   *:8
LISTEN                0                     128                                                [::]:2
LISTEN                0                     5                                                 [::1]:6
LISTEN                0                     128                                               [::1]:6
LISTEN                0                     1                                    [::ffff:127.0.0.1]:8
LISTEN                0                     128                                                [::]:1
[root@localhost system]#

2.2 Jenkins部署

Jenkins部署过程可以参考这篇文章:https://blog.csdn.net/qq_49530779/article/details/120827362?spm=1001.2014.3001.5501

//两台主机做好免密登录
[root@localhost ~]# ssh-keygen -t rsa

[root@localhost ~]# ssh-copy-id root@192.168.8.130
root@192.168.8.130's password: 1

//安装软件
[root@localhost ~]# yum -y install git maven