首先來看報錯的錯誤信息，一直都報空指針異常；
仔細檢查 是因為mapper上沒有@Autowired的注解
加上這個注解就不會報錯了~
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Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
------>Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause java.lang.Nul
錯誤：Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException]
報錯：嚴重: Servlet.service() for servlet [springmvc] in context with path [ ] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
Request processing failed; nested exception is java.lang.NullPointerException
SSM框架報HTTP Status 500 - Request processing failed; nested exception is java.lang.NullPointerException錯
SEVERE: Servlet.service() for servlet [SpringMVC] in context with path [] threw exception ........
【錯誤日志】嚴重: Servlet.service() for servlet SpringDispatcherServlet threw exception java.lang.IllegalArgumen
ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - [log,175] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception thymeleaf: Could not parse as expression: ""