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[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

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This commit is contained in:
yexuejc007 2023-05-29 16:59:53 +08:00
parent 77a0e29916
commit a05bb00123
4 changed files with 84 additions and 13 deletions
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4
src/main/java/com/yexuejc/base/converter/LocalDateDeserializer.java
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@ -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)

4
src/main/java/com/yexuejc/base/converter/LocalDateTimeDeserializer.java
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@ -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)

14
src/main/java/com/yexuejc/base/converter/TimestampDeserializer.java
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@ -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)

75
src/main/java/com/yexuejc/base/util/JsonUtil.java
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@ -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) {
//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);
private static void setJavaTimeModule(ObjectMapper jsonMapper) {
//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