出现java.lang.UnsupportedClassVersionError错误的原因以及解决方法

　　Exception in thread "main" java.lang.UnsupportedClassVersionError: org/springframework/boot/SpringApplication has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 52.0

　　at java.lang.ClassLoader.defineClass1(Native Method)

　　at java.lang.ClassLoader.defineClass(ClassLoader.java:763)

　　at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

　　at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)

　　at java.net.URLClassLoader.access$100(URLClassLoader.java:73)

　　at java.net.URLClassLoader$1.run(URLClassLoader.java:368)

　　at java.net.URLClassLoader$1.run(URLClassLoader.java:362)

　　at java.security.AccessController.doPrivileged(Native Method)

　　at java.net.URLClassLoader.findClass(URLClassLoader.java:361)

　　at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

　　at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)

　　at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

　　at xpl.p2p.demo.P2pDemoApplication.main(P2pDemoApplication.java:13)