最近加了一个项目，linux服务器是1.7的，springboot项目版本是1.8的，服务器上面跑着其他的项目，这个升级可能会造成一些问题，原来的项目可能受到影响，怀着忐忑的心情（如果跑不了项目不就白写了,然后被老板批一顿）找了很多博客，最后找到了一个可以用的。
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/springframework/boot/loader/JarLauncher : Unsupported major.minor version 52.0
/opt/energy/jdk1.8.0_11/bin/java -jar /opt/energy/springboot-orache-0.0.1-SNAPSHOT.jar&
[1] 25239
Last login: Thu Mar 26 00:19:07 2020 from 172.17.0.101
[[email protected] ~]# java -version
java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)
[[email protected] ~]# getconf LONG_BIT //查看操作系统位数，决定下载linux1.8的32位还是64位
64
****************************************这一部分是尝试脚本失败的*************************************
[[email protected] ~]# cd /opt/energy
[[email protected] energy]# /root/startup.sh
-bash: /root/startup.sh: No such file or directory
[[email protected] energy]# /root/startup.sh
-bash: /root/startup.sh: No such file or directory
[[email protected] energy]# ./startup.sh
-bash: ./startup.sh: Permission denied
[[email protected] energy]# chmod u+x startup.sh
[[email protected] energy]# ./startup.sh
nohup: ignoring input and appending output to `nohup.out'
************************************************************************************************************************
**************这个我没配环境变量，把你的解压后的路径和项目写到这里，执行一下**************
[[email protected] energy]# /opt/energy/jdk1.8.0_11/bin/java -jar /opt/energy/springboot-orache-0.0.1-SNAPSHOT.jar&
[1] 25233
-bash: /opt/energy/jdk1.8.0_11/bin/java: Permission denied ******************没权限加一下操作权限
[[email protected] energy]# chmod 777 jdk1.8.0_11/bin/java
[1]+ Exit 126 /opt/energy/jdk1.8.0_11/bin/java -jar /opt/energy/springboot-orache-0.0.1-SNAPSHOT.jar
[[email protected] energy]# /opt/energy/jdk1.8.0_11/bin/java -jar /opt/energy/springboot-orache-0.0.1-SNAPSHOT.jar&
[1] 25239
[[email protected] energy]#
*********************************************************************
注意：在这一步，你看到这个图案，基本就成功了
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