build(server): 新增Jackson序列化规则配置

jeecg-boot-parent/jeecg-boot-module-system/src/main/java/org/jeecg/config/init/JacksonConfig.java

+package org.jeecg.config.init;
+
+import com.chanjx.utils.JsonUtils;
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.databind.*;
+import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
+import com.fasterxml.jackson.databind.module.SimpleModule;
+import com.fasterxml.jackson.databind.ser.std.StdSerializer;
+import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
+import com.fasterxml.jackson.databind.util.StdDateFormat;
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import javax.annotation.PostConstruct;
+import java.io.IOException;
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+
+/**
+ * @author 陈俊雄
+ * @since 2020/7/28
+ **/
+@Configuration
+public class JacksonConfig {
+
+    @Autowired
+    private ObjectMapper objectMapper;
+
+    @PostConstruct
+    public void init() {
+        // Jackson对LocalDateTime进行支持
+        final JavaTimeModule javaTimeModule = new JavaTimeModule();
+        JsonUtils.registerModule(javaTimeModule);
+        objectMapper.registerModule(javaTimeModule);
+        // Jackson序列化Date加上时区
+        final StdDateFormat stdDateFormat = new StdDateFormat().withColonInTimeZone(true);
+        JsonUtils.setDateFormat(stdDateFormat);
+        objectMapper.setDateFormat(stdDateFormat);
+        // 禁用将时间序列化成时间戳
+        JsonUtils.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
+        objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
+    }
+
+    /**
+     * 将Long类型字段转Json字符串时转换为String类型防止前端Js精度丢失
+     *
+     * @return simpleModule
+     */
+    @Bean
+    public Module getSerializerLong2String() {
+        final SimpleModule simpleModule = new SimpleModule();
+        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
+        simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
+        return simpleModule;
+    }
+
+    /**
+     * 将Double类型字段转Json字符串时转换为String类型防止前端Js精度丢失
+     *
+     * @return simpleModule
+     */
+    @Bean
+    public Module getSerializerDouble2String() {
+        final SimpleModule simpleModule = new SimpleModule();
+        simpleModule.addSerializer(Double.class, ToStringSerializer.instance);
+        simpleModule.addSerializer(Double.TYPE, ToStringSerializer.instance);
+        return simpleModule;
+    }
+
+    /**
+     * LocalDateTime序列化、反序列化支持
+     *
+     * @return javaTimeModule
+     */
+    @Bean
+    public Module javaTimeModule() {
+        return new JavaTimeModule();
+    }
+
+    /**
+     * 时间戳与LocalDateTime互转
+     *
+     * @return module
+     */
+    // @Bean
+    public Module getSerializerLocalDateTime2Timestamp() {
+        final SimpleModule simpleModule = new SimpleModule();
+        simpleModule.addSerializer(LocalDateTime.class, LocalDateTime2TimestampSerializer.instance);
+        simpleModule.addDeserializer(LocalDateTime.class, Timestamp2LocalDateTimeSerializer.instance);
+        return simpleModule;
+    }
+
+    /**
+     * LocalDateTime序列化时间戳实现
+     */
+    public static class LocalDateTime2TimestampSerializer extends StdSerializer<LocalDateTime> {
+        final static LocalDateTime2TimestampSerializer instance = new LocalDateTime2TimestampSerializer();
+
+        protected LocalDateTime2TimestampSerializer() {
+            super(LocalDateTime.class);
+        }
+
+        @Override
+        public void serialize(LocalDateTime value, JsonGenerator gen, SerializerProvider provider) throws IOException {
+            gen.writeNumber(value.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli());
+        }
+    }
+
+    /**
+     * LocalDateTime反序列化时间戳实现
+     */
+    public static class Timestamp2LocalDateTimeSerializer extends StdDeserializer<LocalDateTime> {
+        final static Timestamp2LocalDateTimeSerializer instance = new Timestamp2LocalDateTimeSerializer();
+
+        protected Timestamp2LocalDateTimeSerializer() {
+            super(LocalDateTime.class);
+        }
+
+        @Override
+        public LocalDateTime deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
+            return Instant.ofEpochMilli(p.getValueAsLong()).atZone(ZoneId.systemDefault()).toLocalDateTime();
+        }
+    }
+}