🎉 增强jackson默认配置，支持大数字自动转字符串，以及开启关闭空数字类型转换为-1的逻辑

blade-core-tool/src/main/java/org/springblade/core/tool/jackson/BigNumberSerializer.java

@@ -0,0 +1,59 @@
+/**
+ * Copyright (c) 2018-2099, DreamLu 卢春梦 (qq596392912@gmail.com).
+ * <p>
+ * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0;
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.gnu.org/licenses/lgpl.html
+ * <p>
+ * 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.springblade.core.tool.jackson;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
+import com.fasterxml.jackson.databind.ser.std.NumberSerializer;
+
+import java.io.IOException;
+
+/**
+ * 大数值序列化，避免超过js的精度，造成精度丢失
+ *
+ * @author L.cm
+ */
+@JacksonStdImpl
+public class BigNumberSerializer extends NumberSerializer {
+
+	/**
+	 * js 最大值为 Math.pow(2, 53)，十进制为：9007199254740992
+	 */
+	private static final long JS_NUM_MAX = 0x20000000000000L;
+	/**
+	 * js 最小值为 -Math.pow(2, 53)，十进制为：-9007199254740992
+	 */
+	private static final long JS_NUM_MIN = -0x20000000000000L;
+	/**
+	 * Static instance that is only to be used for {@link Number}.
+	 */
+	public final static BigNumberSerializer instance = new BigNumberSerializer(Number.class);
+
+	public BigNumberSerializer(Class<? extends Number> rawType) {
+		super(rawType);
+	}
+
+	@Override
+	public void serialize(Number value, JsonGenerator gen, SerializerProvider provider) throws IOException {
+		long longValue = value.longValue();
+		if (longValue < JS_NUM_MIN || longValue > JS_NUM_MAX) {
+			gen.writeString(value.toString());
+		} else {
+			super.serialize(value, gen, provider);
+		}
+	}
+}

blade-core-tool/src/main/java/org/springblade/core/tool/jackson/BladeJacksonProperties.java

@@ -29,6 +29,15 @@ import org.springframework.boot.context.properties.ConfigurationProperties;
 @ConfigurationProperties("blade.jackson")
 public class BladeJacksonProperties {
 
+	/**
+	 * null 转为 空，字符串转成""，数组转为[]，对象转为{}，数字转为-1
+	 */
+	private Boolean nullToEmpty = Boolean.TRUE;
+	/**
+	 * 响应到前端，大数值自动写出为 String，避免精度丢失
+	 */
+	private Boolean bigNumToString = Boolean.TRUE;
+
 	/**
 	 * 支持 MediaType text/plain，用于和 blade-api-crypto 一起使用
 	 */

blade-core-tool/src/main/java/org/springblade/core/tool/jackson/BladeNumberModule.java

@@ -0,0 +1,47 @@
+/**
+ * Copyright (c) 2018-2099, DreamLu 卢春梦 (qq596392912@gmail.com).
+ * <p>
+ * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0;
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.gnu.org/licenses/lgpl.html
+ * <p>
+ * 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.springblade.core.tool.jackson;
+
+import com.fasterxml.jackson.databind.module.SimpleModule;
+import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
+
+import java.math.BigDecimal;
+import java.math.BigInteger;
+
+/**
+ * 大整数序列化为 String 字符串，避免浏览器丢失精度
+ *
+ * <p>
+ * 前端建议采用：
+ * bignumber 库： https://github.com/MikeMcl/bignumber.js
+ * decimal.js 库： https://github.com/MikeMcl/decimal.js
+ * </p>
+ *
+ * @author L.cm
+ */
+public class BladeNumberModule extends SimpleModule {
+	public static final BladeNumberModule INSTANCE = new BladeNumberModule();
+
+	public BladeNumberModule() {
+		super(BladeNumberModule.class.getName());
+		// Long 和 BigInteger 采用定制的逻辑序列化，避免超过js的精度
+		this.addSerializer(Long.class, BigNumberSerializer.instance);
+		this.addSerializer(Long.TYPE, BigNumberSerializer.instance);
+		this.addSerializer(BigInteger.class, BigNumberSerializer.instance);
+		// BigDecimal 采用 toString 避免精度丢失，前端采用 decimal.js 来计算。
+		this.addSerializer(BigDecimal.class, ToStringSerializer.instance);
+	}
+}

blade-core-tool/src/main/java/org/springblade/core/tool/jackson/MappingApiJackson2HttpMessageConverter.java

@@ -49,7 +49,7 @@ public class MappingApiJackson2HttpMessageConverter extends AbstractReadWriteJac
 	 * @see Jackson2ObjectMapperBuilder#json()
 	 */
 	public MappingApiJackson2HttpMessageConverter(ObjectMapper objectMapper, BladeJacksonProperties properties) {
-		super(objectMapper, initWriteObjectMapper(objectMapper), initMediaType(properties));
+		super(objectMapper, initWriteObjectMapper(objectMapper, properties), initMediaType(properties));
 	}
 
 	private static List<MediaType> initMediaType(BladeJacksonProperties properties) {
@@ -63,12 +63,18 @@ public class MappingApiJackson2HttpMessageConverter extends AbstractReadWriteJac
 		return supportedMediaTypes;
 	}
 
-	private static ObjectMapper initWriteObjectMapper(ObjectMapper readObjectMapper) {
+	private static ObjectMapper initWriteObjectMapper(ObjectMapper readObjectMapper, BladeJacksonProperties properties) {
 		// 拷贝 readObjectMapper
 		ObjectMapper writeObjectMapper = readObjectMapper.copy();
+		// 大数字 转 字符串
+		if (Boolean.TRUE.equals(properties.getBigNumToString())) {
+			writeObjectMapper.registerModules(BladeNumberModule.INSTANCE);
+		}
 		// null 处理
-		writeObjectMapper.setSerializerFactory(writeObjectMapper.getSerializerFactory().withSerializerModifier(new BladeBeanSerializerModifier()));
+		if (Boolean.TRUE.equals(properties.getNullToEmpty())) {
-		writeObjectMapper.getSerializerProvider().setNullValueSerializer(BladeBeanSerializerModifier.NullJsonSerializers.STRING_JSON_SERIALIZER);
+			writeObjectMapper.setSerializerFactory(writeObjectMapper.getSerializerFactory().withSerializerModifier(new BladeBeanSerializerModifier()));
+			writeObjectMapper.getSerializerProvider().setNullValueSerializer(BladeBeanSerializerModifier.NullJsonSerializers.STRING_JSON_SERIALIZER);
+		}
 		return writeObjectMapper;
 	}