查看Java 编译的class文件使用的jdk版本

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D:\workspace_git_card\jd-overseas-crp\jd-ocrp-rpc\target\classes\com\jd\ocrp\api
\service>javap -verbose CrpAccountProvider.class >d:/x.txt

D:\workspace_git_card\jd-overseas-crp\jd-ocrp-rpc\target\classes\com\jd\ocrp\api
\service>