jenkins手动拉取java项目，根据tag，可以回滚

　　1.配置java和maven位置信息

 　　2.部署脚本

[root@nginx script]# cat javaci.sh 
#!/bin/bash
# 环境变量
# $WORKSPACE:JENKINS自带环境变量，在哪个任务下执行，WORKSAPCE就是哪个目录
# $tag_version:JENKINS任务里面git插件传过来的值，就是程序的tag版本
DATE=`date +%F-%H-%M-%S`
FILENAME="helloworld-${tag_version}"
SDIR=$WORKSPACE
DDIR=/usr/local/tomcat/webapps
OTHERIP="192.168.3.156 192.168.3.157"

#推送部署程序
deploy_code(){
  for IP in $OTHERIP
  do
    echo "正在传输文件到$IP"
    scp -rq $SDIR/target/*war root@$IP:$DDIR/${FILENAME}.war
    echo "$IP文件传输完成,正在部署"
    ssh root@$IP "rm -rf $DDIR/ROOT &&
                  ln -s $DDIR/$FILENAME $DDIR/ROOT &&
                  /usr/local/tomcat/bin/shutdown.sh &&
                  sleep 1 &&
                  /usr/local/tomcat/bin/startup.sh"
    echo "$IP部署完成"
  done
}

#部署
deploy(){
  deploy_code
}

#回滚
back(){
  BACKFILE=$(ssh root@192.168.3.156 "find /usr/local/tomcat/webapps/ -maxdepth 1 -name helloworld-${tag_version}")
  if [[ $BACKFILE == "" ]];then
    echo "无法取到${tag_version}版本，请检查是否已经部署"
    exit 1
  fi
  for IP in $OTHERIP
  do
    echo "正在回滚$IP到$tag_version版本"
    ssh root@$IP "rm -rf $DDIR/ROOT &&
                  ln -s $BACKFILE $DDIR/ROOT &&
                  /usr/local/tomcat/bin/shutdown.sh &&
                  sleep 1 &&
                  /usr/local/tomcat/bin/startup.sh"
    echo "$IP回滚完成"
  done
}
if [[ $SELECT == "DEPLOY" ]];then
  deploy
elif [[ $SELECT == "BACK" ]];then
  back
fi

　　3.jenkins页面配置

 　　4.程序目录