一、新建一个项目

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项目名称随意

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调用maven命令

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二、部署java服务器，做jenkins打包上线

[root@java-server ~]# mkdir -p /data/application
上传jdk   （放在/usr/local 下面也可以 后面记得改）
[root@java-server ~]# tar xzf jdk-8u191-linux-x64.tar.gz -C /usr/local/
[root@java-server ~]# cd /usr/local/
[root@java-server local]# mv jdk1.8.0_191/ java
下载tomcat
[root@java-server ~]# wget http://mirrors.tuna.tsinghua.edu.cn/apache/tomcat/tomcat-8/v8.5.42/bin/apache-tomcat-8.5.42.tar.gz
[root@java-server ~]# tar xzf apache-tomcat-8.5.42.tar.gz -C /data/application/
[root@java-server ~]# cd /data/application/
[root@java-server application]# mv apache-tomcat-8.5.42/ tomcat
设置环境变量
[root@java-server ~]# vim /etc/profile
export JAVA_HOME=/usr/local/java
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$JAVA_HOME/lib/tools.jar
export TOMCAT_HOME=/data/application/tomcat
[root@java-server ~]# source /etc/profile
测试:
[root@java-server ~]# java -version 
java version "1.8.0_191"
Java(TM) SE Runtime Environment (build 1.8.0_191-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)
删除tomcat默认发布目录下面的内容:
[root@java-server ~]# rm -rf /data/application/tomcat/webapps/*
[root@java-server ~]# cd /data/application/tomcat/webapps/
[root@java-server webapps]# ls
创建目录和脚本:
[root@java-server ~]# mkdir /opt/script  #创建脚本目录
[root@java-server ~]# vim app-jenkins.sh   #创建脚本
脚本内容在后面
[root@java-server ~]# chmod +x app-jenkins.sh  #添加执行权限
[root@java-server ~]# mv app-jenkins.sh /opt/script/

三、回到jenkins页面开始构建任务

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四、登陆java-server服务器查看

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脚本内容

[root@java-server script]# cat app-jenkins.sh 
#!/usr/bin/bash
#本脚本适用于jenkins持续集成，实现备份war包到代码更新上线！使用时请注意全局变量。
#================
#Defining variables
export JAVA_HOME=/usr/local/
export TOMCAT_HOME=/usr/local/tomcat
webapp_path="/usr/local/tomcat/webapps"
tomcat_run="/usr/local/tomcat/bin"
updata_path="/data/update/`date +%F-%T`"
backup_path="/data/backup/`date +%F-%T`"
tomcat_pid=`ps -ef | grep tomcat | grep -v grep | awk '{print $2}'`
files_dir="easy-springmvc-maven"
files="easy-springmvc-maven.war"
job_path="/root/upload"

#Preparation environment
echo "Creating related directory"
mkdir -p $updata_path
mkdir -p $backup_path

echo "Move the uploaded war package to the update directory"
mv $job_path/$files $updata_path

echo "========================================================="
cd /opt
echo "Backing up java project"
if [ -f $webapp_path/$files ];then
    tar czf $backup_path/`date +%F-%H`.tar.gz $webapp_path
    if [ $? -ne 0 ];then
        echo "打包失败，自动退出"
        exit 1
    else
        echo "Checking if tomcat is started"
        if [ -n "$tomcat_pid" ];then
            kill -9 $tomcat_pid
            if [ $? -ne 0 ];then
                echo "tomcat关闭失败，将会自动退出"
                exit 2
            fi
        fi
        cd $webapp_path
        rm -rf $files && rm -rf $files_dir
        cp $updata_path/$files $webapp_path
        cd /opt
        $tomcat_run/startup.sh
        sleep 5
        echo "显示tomcat的pid"
        echo "`ps -ef | grep tomcat | grep -v grep | awk '{print $2}'`"
        echo "tomcat startup"
        echo "请手动查看tomcat日志。脚本将会自动退出"
    fi
else
    echo "Checking if tomcat is started"
        if [ -n "$tomcat_pid" ];then
            kill -9 $tomcat_pid
                if [ $? -ne 0 ];then
                    echo "tomcat关闭失败，将会自动退出"
                        exit 2
                fi
        fi
    cp $updata_path/$files $webapp_path
    $tomcat_run/startup.sh
        sleep 5
        echo "显示tomcat的pid"
        echo "`ps -ef | grep tomcat | grep -v grep | awk '{print $2}'`"
        echo "tomcat startup"
        echo "请手动查看tomcat日志。脚本将会自动退出"
fi

思路：Jenkins 构建过程
1.从github拉取代码 --->/root/.jenkins/workspace
2.build--->jenkins /usr/local/java/maven构建下载好的java代码
3.通过ssh 将打包好的 war包 拷贝到后端服务器（例如java） /root/upload/war
4.通过后端服务器的app-jenkins脚本 将原来的代码进行备份 ，最后重新启动tomcat