添加查询书籍；BookDO映射文件更新；DOMapper添加@Repository注解；添加自定义业务异常处理；添加Validation验证

bookshelfplus/src/main/java/plus/bookshelf/Common/Validator/ValidatorImpl.java

@@ -0,0 +1,37 @@
+package plus.bookshelf.Common.Validator;
+
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.stereotype.Component;
+
+import javax.validation.ConstraintViolation;
+import javax.validation.Validation;
+import javax.validation.Validator;
+import java.util.Set;
+
+@Component
+public class ValidatorImpl implements InitializingBean {
+
+    private Validator validator;
+
+    // 实现校验方法并返回校验结果
+    public ValidationResult validate(Object bean) {
+        ValidationResult result = new ValidationResult();
+        Set<ConstraintViolation<Object>> constraintViolationSet = validator.validate(bean);
+        if (constraintViolationSet.size() > 0) {
+            // 有错误
+            result.setHasErrors(true);
+            constraintViolationSet.forEach(constraintViolation -> {
+                String errMsg = constraintViolation.getMessage();
+                String propertyName = constraintViolation.getPropertyPath().toString();
+                result.getErrMsgMap().put(propertyName, errMsg);
+            });
+        }
+        return result;
+    }
+
+    @Override
+    public void afterPropertiesSet() throws Exception {
+        // 将Hibernate Validator通过工厂的初始化方式使其实例化
+        this.validator = (Validator) Validation.buildDefaultValidatorFactory().getValidator();
+    }
+}