安装目录：C:\Program Files\Java\jdk1.8.0_131

1.JAVA_HOME

C:\Program Files\Java\jdk1.8.0_131

2.CLASSPATH

.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar;

3.path

%JAVA_HOME%\bin;%JAVA_HOME%\jre\bin;

或者

C:\Program Files\Java\jdk1.8.0_131\bin;C:\Program Files\Java\jdk1.8.0_131\jre\bin;