jdk地址:https://jingyan.baidu.com/article/d45ad148ba5ab169552b80d3.html
tomcat地址:http://www.w10zj.com/Win10xy/Win10yh_5884.html
输入java后报错: could not open `C:\Program Files\Java\jre1.8.0_171\lib\amd64\jvm.cfg’
解决:将path添加的值移到最前面 ,这个—-》 %JAVA_HOME%\bin;