SPRINGMVC format problem handling for returning Java 8 time JSON data

Annotations are sometimes used when returning JSON-formatted response in spring MVC, @ResponseBody but it can be cumbersome when dealing with time, and the httpmessageconverter that we typically use is MappingJackson2HttpMessageConverter that the time format it returns by default is this:

1"StartDate" : {2"Year": 2010,3"Month": "January",4"DayOfMonth": 1,5"DayOfWeek": "FRIDAY",6"DayOfYear": 1,7"Monthvalue": 1,8"Hour": 2,9"Minute": 2,Ten"Second": 0, One"Nano": 0, A"Chronology" : { -"id": "ISO", -"CalendarType": "iso8601" the     } -}

But in general we will not return this to the front-end use, for Localdate want to return the format is 2016-11-26，而LocalDateTime想要返回的格式是2016-11-26  21:04:34 such data. Through project research and access to relevant information, here are two ways to achieve this in your personal research.

Workaround One:

For MAVEN projects, introduce the following jar package in the POM:

1 <dependency>2      <groupId>com.fasterxml.jackson.datatype</groupId>3       <artifactId>jackson-datatype-jsr310</artifactId>4      <version>2.8.5</ Version>5 </dependency>

Then add an annotation to the Get function of the Pojo field that you want to JSON @JsonSerializer , as follows

1 ImportCom.fasterxml.jackson.annotation.JsonFormat;2 3@JsonFormat (shape = JsonFormat.Shape.STRING, pattern = "YYYY-MM-DD"))4  PublicLocalDateTime Getbirthday () {5         return  This. Logintime;6     }7 8@JsonFormat (shape = JsonFormat.Shape.STRING, pattern = "Yyyy-mm-dd HH:mm:ss")9  PublicLocalDateTime Getlastlogintime () {Ten         return  This. Logintime; One}

The advantage of this approach is that you can set different display modes for specific domain types, but the pros are also a disadvantage because you want to write annotations like above on each pojo, and you need to introduce additional jsr310 jar packages.

Workaround Two:

Custom Localdate and LocalDateTime serialization classes, and register to object mapper

1 /**2 * JSON processing tool class3  * 4  * 5  */6 @Component7  Public classJsonutil {8 9     Private Static FinalObjectmapper Mapper;Ten  One      Publicobjectmapper Getmapper () { A         returnmapper; -     } -  the     Static { -  -Mapper =NewObjectmapper (); -  +Simplemodule module =Newsimplemodule (); -Module.addserializer (localdate.class,NewLocaldateserializer ()); +Module.addserializer (localtime.class,NewLocaltimeserializer ()); AModule.addserializer (LocalDateTime.class,NewLocaldatetimeserializer ()); at mapper.registermodule (module); -     } -  -      Public StaticString ToJson (Object obj) { -         Try { -             returnmapper.writevalueasstring (obj); in}Catch(Exception e) { -             Throw NewRuntimeException ("Convert JSON character failed!")); to         } +     } -  the      Public<T> T Toobject (String json, class<t>clazz) { *         Try { $             returnMapper.readvalue (JSON, clazz);Panax Notoginseng}Catch(IOException e) { -             Throw NewRuntimeException ("Failed to convert JSON character to Object!")); the         } +     } A } the  + classLocaldateserializerextendsJsonserializer<localdate> { -  $     Private Static FinalDateTimeFormatter dateformatter = Datetimeformatter.ofpattern ("Yyyy-mm-dd"); $  - @Override -      Public voidSerialize (localdate value, Jsongenerator Jgen, serializerprovider provider) the             throwsIOException, jsonprocessingexception { - jgen.writestring (Dateformatter.format (value));Wuyi     } the } -  Wu classLocaldatetimeserializerextendsJsonserializer<localdatetime> { -  About     Private Static FinalDateTimeFormatter DateTimeFormatter = Datetimeformatter.ofpattern ("Yyyy-mm-dd HH:mm:ss"); $  - @Override -      Public voidSerialize (LocalDateTime value, Jsongenerator Jgen, serializerprovider provider) -             throwsIOException, jsonprocessingexception { A jgen.writestring (Datetimeformatter.format (value)); +     } the  - } $  the classLocaltimeserializerextendsJsonserializer<localtime> { the  the     Private Static FinalDateTimeFormatter Timeformatter = Datetimeformatter.ofpattern ("HH:mm:ss"); the  - @Override in      Public voidSerialize (localtime value, Jsongenerator Jgen, serializerprovider provider) the             throwsIOException, jsonprocessingexception { the jgen.writestring (Timeformatter.format (value)); About  the     } the  the}

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Then in the SPRINGMVC configuration file, change <mvc:annotation-driven/> to the following configuration, configure a new JSON converter, Set its Objectmapper object to the Objectmapper object in Jsonutil, which has a higher precedence than the spring built-in JSON converter, so the JSON-related conversion will take precedence over it.

1<mvc:annotation-driven>2<mvc:message-converters>3<Bean4                 class= "Org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" >5<property name= "Objectmapper" value= "#{jsonutil.mapper}"/>6<property name= "Supportedmediatypes" >7<list>8<value>application/json;charset=UTF-8</value>9</list>Ten</property> One</bean> A</mvc:message-converters> -</mvc:annotation-driven>

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Then several date and time types in the JAVA8 can be displayed in a normal and friendly style. The advantage is the global unified management date and time, and other types, the disadvantage of a domain in the Pojo to do special processing.

SPRINGMVC format problem handling for returning Java 8 time JSON data