Add ValidationUtils

src/main/java/cc/ryanc/halo/utils/ValidationUtils.java

@@ -0,0 +1,93 @@
+package cc.ryanc.halo.utils;
+
+import org.springframework.util.CollectionUtils;
+import org.springframework.validation.FieldError;
+
+import javax.validation.ConstraintViolation;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * 有关字段验证的工具类
+ *
+ * @author johnniang
+ */
+public class ValidationUtils {
+
+    private ValidationUtils() {
+    }
+
+    /**
+     * 将字段验证错误转换为标准的map型，key:value = field:message
+     *
+     * @param constraintViolations constraint violations(contain error information)
+     * @return 如果返回null则未出现错误
+     */
+    public static Map<String, String> mapWithValidError(Set<ConstraintViolation<Object>> constraintViolations) {
+        Map<String, String> errMap = null;
+        if (!CollectionUtils.isEmpty(constraintViolations)) {
+            // if not empty
+            errMap = new HashMap<>(4);
+            for (ConstraintViolation<Object> constraintViolation : constraintViolations) {
+                errMap.put(constraintViolation.getPropertyPath().toString(), constraintViolation.getMessage());
+            }
+        }
+        return errMap;
+    }
+
+    public static String stringWithValidError(Set<ConstraintViolation<?>> violations, boolean allError) {
+        StringBuilder errString = new StringBuilder();
+        if (!CollectionUtils.isEmpty(violations)) {
+            for (ConstraintViolation<?> violation : violations) {
+                if (errString.length() > 0) {
+                    errString.append(",");
+                }
+                errString.append(violation.getMessage());
+                if (!allError && errString.length() > 0) {
+                    return errString.toString();
+                }
+            }
+        }
+        return errString.toString();
+    }
+
+    /**
+     * 将字段验证错误转换为标准的map型，key:value = field:message
+     *
+     * @param fieldErrors 字段错误组
+     * @return 如果返回null，则表示未出现错误
+     */
+    public static Map<String, String> mapWithFieldError(List<FieldError> fieldErrors) {
+        Map<String, String> errMap = null;
+
+        if (!CollectionUtils.isEmpty(fieldErrors)) {
+            // 如果不为空
+            errMap = new HashMap<>(4);
+            for (FieldError fieldError : fieldErrors) {
+                errMap.put(fieldError.getField(), fieldError.getDefaultMessage());
+            }
+        }
+
+        return errMap;
+    }
+
+    public static String stringWithFieldError(List<FieldError> fieldErrors, boolean allError) {
+        StringBuilder errString = new StringBuilder();
+        if (!CollectionUtils.isEmpty(fieldErrors)) {
+            // 如果不为空
+            for (FieldError fieldError : fieldErrors) {
+                if (errString.length() > 0) {
+                    errString.append(",");
+                }
+                errString.append(fieldError.getField()).append(":").append(fieldError.getDefaultMessage());
+                if (!allError && errString.length() > 0) {
+                    return errString.toString();
+                }
+            }
+        }
+
+        return errString.toString();
+    }
+}