课堂模块添加公共异常处理

sclass/src/main/java/com/xhkjedu/sclass/config/ErrorAdivceController.java

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+package com.xhkjedu.sclass.config;
+import com.alibaba.fastjson.JSON;
+import com.xhkjedu.config.MissingParametersException;
+import com.xhkjedu.utils.N_Utils;
+import com.xhkjedu.vo.ResultVo;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.dao.DataIntegrityViolationException;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+import javax.servlet.http.HttpServletRequest;
+
+/**
+ * @创建人 :zj
+ * @创建时间 2019/11/7
+ * @修改人和其它信息
+ * @描述 :项目异常处理类:
+ * 项目中所有controller层抛出的异常信息都会被拦截。
+ * 方便我们查看异常原因，减少开发中大量的try catch。
+ * 拦截异常后，打印异常信息，返回前端约定参数对象。
+ */
+@Slf4j
+@ResponseBody
+@ControllerAdvice
+public class ErrorAdivceController {
+    @ExceptionHandler(MissingParametersException.class)
+    public ResultVo missingParametersException(MissingParametersException ex) {
+        log.error("参数异常:   -------> " + ex.getMessage());
+        return new ResultVo(1, ex.getMessage());
+    }
+
+    @ExceptionHandler(DataIntegrityViolationException.class)
+    public ResultVo DataIntegrityViolationException(DataIntegrityViolationException ex){
+        log.error("数据库异常:   -------> " + ex.getMessage());
+        String msg = ex.getMessage();
+        if (N_Utils.isNotEmpty(msg) && msg.indexOf("SQLIntegrityConstraintViolationException") != -1){
+            return new ResultVo(1,"存在关联信息");
+        }
+        return new ResultVo(1,"数据库处理异常");
+    }
+
+    @ExceptionHandler(Exception.class)
+    public ResultVo exceptionHandler(Exception ex) {
+        log.error("程序运行异常:   -------> " + ex.getMessage());
+        String msg = ex.getMessage();
+        if (N_Utils.isNotEmpty(msg) && msg.indexOf("JSON parse error") != -1){
+            return new ResultVo(1,"json格式不对");
+        }
+        return new ResultVo(1, "程序处理异常");
+    }
+
+    @ExceptionHandler(NullPointerException.class)
+    public ResultVo nullPointerException(NullPointerException ex) {
+        StackTraceElement element = ex.getStackTrace()[0];
+        log.error("参数为空异常:   -------> " + JSON.toJSONString(element));
+        return new ResultVo(1, "参数为空异常");
+    }
+
+    @ExceptionHandler(value = IllegalArgumentException.class)
+    public ResultVo illegalArgumentExceptionHandler(HttpServletRequest request,IllegalArgumentException ex) {
+        log.error("请求参数错误 URL : {}，Exception : {}", request.getRequestURL(),ex.getMessage());
+        return new ResultVo(1, "请求参数错误");
+    }
+
+
+}