BigDecimal小数点截取Filter

Author: hengboy

api-boot-project/api-boot-plugins/api-boot-plugin-http-converter/src/main/java/org/minbox/framework/api/boot/plugin/http/converter/filter/DecimalAccuracyFilter.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright [2019] [恒宇少年 - 于起宇]
+ *
+ *      Licensed under the Apache License, Version 2.0 (the "License");
+ *      you may not use this file except in compliance with the License.
+ *      You may obtain a copy of the License at
+ *
+ *          http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *      Unless required by applicable law or agreed to in writing, software
+ *      distributed under the License is distributed on an "AS IS" BASIS,
+ *      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *      See the License for the specific language governing permissions and
+ *      limitations under the License.
+ *
+ */
+
+package org.minbox.framework.api.boot.plugin.http.converter.filter;
+
+import com.alibaba.fastjson.serializer.ValueFilter;
+import org.minbox.framework.api.boot.plugin.http.converter.filter.annotation.ApiBootDecimalAccuracy;
+import org.springframework.util.ReflectionUtils;
+
+import java.lang.reflect.Field;
+import java.math.BigDecimal;
+
+/**
+ * ApiBoot Decimal Accuracy Value Filter
+ *
+ * @author：恒宇少年 - 于起宇
+ * <p>
+ * DateTime：2019-04-16 13:17
+ * Blog：http://blog.yuqiyu.com
+ * WebSite：http://www.jianshu.com/u/092df3f77bca
+ * Gitee：https://gitee.com/hengboy
+ * GitHub：https://github.com/hengboy
+ */
+public class DecimalAccuracyFilter implements ValueFilter {
+    
+    @Override
+    public Object process(Object object, String name, Object value) {
+        try {
+            // find field
+            Field field = ReflectionUtils.findField(object.getClass(), name);
+            // Have ApiBootDecimalAccuracy Annotation
+            // Value is BigDecimal Instance
+            if (field.isAnnotationPresent(ApiBootDecimalAccuracy.class) && value instanceof BigDecimal) {
+                ApiBootDecimalAccuracy decimalAccuracy = field.getDeclaredAnnotation(ApiBootDecimalAccuracy.class);
+                BigDecimal decimalValue = (BigDecimal) value;
+                return decimalValue.setScale(decimalAccuracy.scale(), decimalAccuracy.roundingMode());
+            }
+        } catch (Exception e) {
+            //ignore
+            return value;
+        }
+        return value;
+    }
+}

api-boot-project/api-boot-plugins/api-boot-plugin-http-converter/src/main/java/org/minbox/framework/api/boot/plugin/http/converter/filter/annotation/ApiBootDecimalAccuracy.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright [2019] [恒宇少年 - 于起宇]
+ *
+ *      Licensed under the Apache License, Version 2.0 (the "License");
+ *      you may not use this file except in compliance with the License.
+ *      You may obtain a copy of the License at
+ *
+ *          http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *      Unless required by applicable law or agreed to in writing, software
+ *      distributed under the License is distributed on an "AS IS" BASIS,
+ *      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *      See the License for the specific language governing permissions and
+ *      limitations under the License.
+ *
+ */
+
+package org.minbox.framework.api.boot.plugin.http.converter.filter.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+import java.math.BigDecimal;
+
+/**
+ * ApiBoot Decimal Accuracy
+ *
+ * @author：恒宇少年 - 于起宇
+ * <p>
+ * DateTime：2019-04-16 13:18
+ * Blog：http://blog.yuqiyu.com
+ * WebSite：http://www.jianshu.com/u/092df3f77bca
+ * Gitee：https://gitee.com/hengboy
+ * GitHub：https://github.com/hengboy
+ */
+@Target({ElementType.FIELD})
+@Retention(RetentionPolicy.RUNTIME)
+public @interface ApiBootDecimalAccuracy {
+    /**
+     * Keep two decimal points
+     *
+     * @return number
+     */
+    int scale() default 2;
+
+    /**
+     * BigDecimal round mode
+     *
+     * @return mode
+     */
+    int roundingMode() default BigDecimal.ROUND_DOWN;
+}