feat: 添加全局的异常处理类，实现 ErrorContoller 对 404 异常定制返回内容

Author: cadecode

src/main/java/info/cadecode/simple/common/exception/SimpleExceptionHandler.java

@@ -0,0 +1,59 @@
+package info.cadecode.simple.common.exception;
+
+import info.cadecode.simple.common.response.SimpleRes;
+import info.cadecode.simple.constant.ReasonEnum;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.boot.web.servlet.error.ErrorController;
+import org.springframework.http.converter.HttpMessageNotReadableException;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.*;
+
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * @author Cade Li
+ * @date 2021/7/16
+ * @description: 统一异常处理类
+ */
+@RestController
+@ControllerAdvice(basePackages = {"info.cadecode.simple.controller"})
+public class SimpleExceptionHandler implements ErrorController {
+
+    private final Logger log = LoggerFactory.getLogger(this.getClass());
+
+    /**
+     * 处理 SimpleException
+     */
+    @ExceptionHandler(value = SimpleException.class)
+    @ResponseBody
+    public SimpleRes handleSimpleException(SimpleException e, HttpServletResponse response) {
+        log.error("SimpleException Handler =>", e);
+        response.setStatus(e.getCode());
+        return SimpleRes.exception(e);
+    }
+
+    /**
+     * 处理一般异常
+     */
+    @ExceptionHandler(value = Exception.class)
+    @ResponseBody
+    public SimpleRes handleOtherException(Exception e, HttpServletResponse response) {
+        log.error("Exception Handler =>", e);
+        if (e instanceof HttpMessageNotReadableException) {
+            response.setStatus(ReasonEnum.NOT_FIT.getCode());
+            return SimpleRes.reason(ReasonEnum.NOT_FIT).data(e.getMessage());
+        }
+        response.setStatus(ReasonEnum.ERROR.getCode());
+        return SimpleRes.reason(ReasonEnum.ERROR).data(e.getMessage());
+    }
+
+    /**
+     * 处理 404 错误（实现 ErrorController 接口）
+     */
+    @RequestMapping("${server.error.path:${error.path:/error}}")
+    public SimpleRes handleError(HttpServletResponse response) {
+        response.setStatus(ReasonEnum.NOT_EXIT.getCode());
+        return SimpleRes.reason(ReasonEnum.NOT_EXIT);
+    }
+}