[update] JsonUtil 升级优化，提供不同序列化反序列化的jsonmapper,处理反序列化时间值为空时的优化

src/main/java/com/yexuejc/base/converter/LocalDateDeserializer.java

@@ -4,6 +4,7 @@ import com.fasterxml.jackson.core.JsonParser;
 import com.fasterxml.jackson.databind.DeserializationContext;
 import com.fasterxml.jackson.databind.JsonDeserializer;
 import com.yexuejc.base.constant.DateConsts;
+import com.yexuejc.base.util.StrUtil;
 
 import java.io.IOException;
 import java.time.LocalDate;
@@ -22,6 +23,9 @@ public class LocalDateDeserializer extends JsonDeserializer<LocalDate> {
     public LocalDate deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
             throws IOException {
         String timeString = jsonParser.getValueAsString();
+        if (StrUtil.isEmpty(timeString)) {
+            return null;
+        }
         if (timeString.contains(DateConsts.BAR)) {
             return LocalDate.parse(timeString, DateTimeFormatter.ISO_DATE);
         } else if (timeString.contains(DateConsts.DATE_KEY_AM)

src/main/java/com/yexuejc/base/converter/LocalDateTimeDeserializer.java

@@ -4,6 +4,7 @@ import com.fasterxml.jackson.core.JsonParser;
 import com.fasterxml.jackson.databind.DeserializationContext;
 import com.fasterxml.jackson.databind.JsonDeserializer;
 import com.yexuejc.base.constant.DateConsts;
+import com.yexuejc.base.util.StrUtil;
 
 import java.io.IOException;
 import java.time.LocalDateTime;
@@ -21,6 +22,9 @@ public class LocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {
     public LocalDateTime deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
             throws IOException {
         String timeString = jsonParser.getValueAsString();
+        if (StrUtil.isEmpty(timeString)) {
+            return null;
+        }
         if (timeString.contains(DateConsts.DATE_KEY_T)) {
             return LocalDateTime.parse(timeString, DateTimeFormatter.ISO_LOCAL_DATE_TIME);
         } else if (timeString.contains(DateConsts.DATE_KEY_AM)

src/main/java/com/yexuejc/base/converter/TimestampDeserializer.java

@@ -1,16 +1,17 @@
 package com.yexuejc.base.converter;
 
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+import com.yexuejc.base.constant.DateConsts;
+import com.yexuejc.base.util.StrUtil;
+
 import java.io.IOException;
 import java.sql.Timestamp;
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
 import java.util.Locale;
 
-import com.fasterxml.jackson.core.JsonParser;
-import com.fasterxml.jackson.databind.DeserializationContext;
-import com.fasterxml.jackson.databind.JsonDeserializer;
-import com.yexuejc.base.constant.DateConsts;
-
 /**
  * json转LocalDateTime
  *
@@ -22,6 +23,9 @@ public class TimestampDeserializer extends JsonDeserializer<Timestamp> {
     public Timestamp deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
             throws IOException {
         String timeString = jsonParser.getValueAsString();
+        if (StrUtil.isEmpty(timeString)) {
+            return null;
+        }
         if (timeString.contains(DateConsts.DATE_KEY_T)) {
             return Timestamp.valueOf(LocalDateTime.parse(timeString, DateTimeFormatter.ISO_LOCAL_DATE_TIME));
         } else if (timeString.contains(DateConsts.DATE_KEY_AM)

src/main/java/com/yexuejc/base/util/JsonUtil.java

@@ -1,6 +1,7 @@
 package com.yexuejc.base.util;
 
 import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.core.JsonGenerator;
 import com.fasterxml.jackson.core.JsonParseException;
 import com.fasterxml.jackson.core.JsonParser;
 import com.fasterxml.jackson.core.JsonProcessingException;
@@ -40,21 +41,16 @@ public class JsonUtil {
     private static JsonMapper jsonMapper = new JsonMapper();
 
     static {
+        JsonUtil.setJavaTimeModule(JsonUtil.jsonMapper);
         JsonUtil.initDefaultObjectMapper(JsonUtil.jsonMapper);
     }
 
     /**
-     * 初始化ObjectMapper为默认属性
+     * 对时间的支持
      *
      * @param jsonMapper
      */
-    private static void initDefaultObjectMapper(ObjectMapper jsonMapper) {
+    private static void setJavaTimeModule(ObjectMapper jsonMapper) {
-        //值为空时，NON_NULL：舍去字段；ALWAYS:保留字段，值为“”
-        jsonMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
-        jsonMapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
-        jsonMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
-        jsonMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
-        jsonMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
         //设置一下时区，可以和程序同步避免时区问题
         jsonMapper.setTimeZone(TimeZone.getDefault());
         jsonMapper.setDateFormat(DateUtil.DATE_TIME_FORMAT);
@@ -71,6 +67,69 @@ public class JsonUtil {
         jsonMapper.registerModule(javaTime);
     }
 
+    /**
+     * 初始化ObjectMapper为默认属性
+     * <pre>
+     *     1.序列化值为空时，NON_NULL：舍去字段
+     *     2.JsonParser.Feature.ALLOW_SINGLE_QUOTES：解析JSON时允许使用单引号（'）作为字符串的引号(true)
+     *          例子：{'localDateTime':'2023-05-29T15:32:03.9770447'}
+     *     3.JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES：解析JSON时允许不使用引号作为字符串的引号(true)
+     *          例子：{age:12};适用于基本数据类型
+     *     4.DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES：json对应java Bean,数据字段对不齐的情况下不报错(false)
+     *     5.SerializationFeature.WRITE_DATES_AS_TIMESTAMPS(false):用于指定是否将日期类型序列化为时间戳格式。如果启用该特性，则日期类型将被序列化为Unix时间戳（即从1970年1月1日00:00:00 GMT开始的毫秒数）。如果禁用该特性，则日期类型将以其原始格式进行序列化。
+     *          例子(false)："timestamp": "2020-07-08T02:02:55.000+00:00"
+     *          例子(true)："timestamp": 1594236175000
+     * </pre>
+     *
+     * @param jsonMapper
+     */
+    private static void initDefaultObjectMapper(ObjectMapper jsonMapper) {
+        //值为空时，NON_NULL：舍去字段；ALWAYS:保留字段
+        jsonMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
+        jsonMapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
+        jsonMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
+        jsonMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
+        jsonMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
+    }
+
+    /**
+     * 初始化ObjectMapper的默认属性
+     * <pre>
+     *     1.序列化值为空时，ALWAYS:保留字段，值为“”
+     *     2.JsonParser.Feature.ALLOW_SINGLE_QUOTES：解析JSON时允许使用单引号（'）作为字符串的引号(true)
+     *          例子：{'localDateTime':'2023-05-29T15:32:03.9770447'}
+     *     3.JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES：解析JSON时允许不使用引号作为字符串的引号(true)
+     *          例子：{age:12};适用于基本数据类型
+     *     4.DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES：json对应java Bean,数据字段对不齐的情况下不报错(false)
+     *     5.SerializationFeature.WRITE_DATES_AS_TIMESTAMPS(false):用于指定是否将日期类型序列化为时间戳格式。如果启用该特性，则日期类型将被序列化为Unix时间戳（即从1970年1月1日00:00:00 GMT开始的毫秒数）。如果禁用该特性，则日期类型将以其原始格式进行序列化。
+     *          例子(false)："timestamp": "2020-07-08T02:02:55.000+00:00"
+     *          例子(true)："timestamp": 1594236175000
+     *     6.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT：反序列化值为空时，映射到java Bean 非字符串类型，值为：null
+     * </pre>
+     *
+     * @return
+     */
+    public static ObjectMapper acceptEmptyStringAsNullObject() {
+        JsonMapper jsonMapper = new JsonMapper();
+        setJavaTimeModule(jsonMapper);
+        //值为空时，ALWAYS:保留字段，默认字符串值为“”，对象值为null
+        jsonMapper.setSerializationInclusion(JsonInclude.Include.ALWAYS);
+        jsonMapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
+        jsonMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
+        jsonMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
+        jsonMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
+        jsonMapper.configure(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true);
+
+        //值为空时，序列化所有值为“”
+        jsonMapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer<>() {
+            @Override
+            public void serialize(Object o, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
+                jsonGenerator.writeString("");
+            }
+        });
+        return jsonMapper;
+    }
+
     //TODO 待优化
     public static void initSnakeCase() {
         //驼峰下划线互转