這個錯誤的出現一般是SpringBoot的啟動類（類名上面有@SpringBootApplication注解 ）與controller包不在同一個目錄下，解決方案就是把啟動類和controller包放在同目錄下就可以啦。
這個錯誤出現需要將Controller層中的@Controller注解改為@RestController，當然也有可能是其它原因，具體需要仔細排查
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