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Mengkonfigurasi ObjectMapper di Musim Semi

tujuan saya adalah untuk mengkonfigurasi objectMapper dengan cara yang hanya mengurutkan elemen yang dianotasi dengan @JsonProperty.

Untuk melakukannya saya mengikuti penjelasan ini yang mengatakan bagaimana mengkonfigurasi objectmapper.

Saya menyertakan objectmapper khusus seperti yang dijelaskan di sini .

Namun ketika kelas NumbersOfNewEvents diserialisasi masih berisi semua atribut di json.

Apakah ada yang punya petunjuk?... Terima kasih sebelumnya

Jackson 1.8.0 Spring 3.0.5

CustomObjectMapper

public class CompanyObjectMapper extends ObjectMapper {
    public CompanyObjectMapper() {
        super();
        setVisibilityChecker(getSerializationConfig()
                .getDefaultVisibilityChecker()
                .withCreatorVisibility(JsonAutoDetect.Visibility.NONE)
                .withFieldVisibility(JsonAutoDetect.Visibility.NONE)
                .withGetterVisibility(JsonAutoDetect.Visibility.NONE)
                .withIsGetterVisibility(JsonAutoDetect.Visibility.NONE)
                .withSetterVisibility(JsonAutoDetect.Visibility.DEFAULT));
    }
}

servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <context:component-scan base-package="de.Company.backend.web" />

    <mvc:annotation-driven />

    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
                    <property name="objectMapper" ref="jacksonObjectMapper" />
                </bean>
            </list>
        </property>
    </bean>

    <bean id="jacksonObjectMapper" class="de.Company.backend.web.CompanyObjectMapper" />
</beans>

NumbersOfNewEvents

public class NumbersOfNewEvents implements StatusAttribute {

    public Integer newAccepts;
    public Integer openRequests;

    public NumbersOfNewEvents() {
        super();
    }
}
61
Steve Eastwood

Menggunakan Spring Boot (1.2.4) dan Jackson (2.4.6) konfigurasi berbasis penjelasan berikut bekerja untuk saya.

@Configuration
public class JacksonConfiguration {

    @Bean
    public ObjectMapper objectMapper() {
        ObjectMapper mapper = new ObjectMapper();
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        mapper.configure(MapperFeature.DEFAULT_VIEW_INCLUSION, true);

        return mapper;
    }
}
92
Alex

Mungkin karena saya menggunakan Spring 3.1 (bukan Spring 3.0.5 seperti yang ditentukan pertanyaan Anda), tetapi jawaban Steve Eastwood tidak berhasil untuk saya. Solusi ini berfungsi untuk Spring 3.1:

Dalam konteks xml pegas Anda:

<mvc:annotation-driven>
    <mvc:message-converters>
        <bean class="org.springframework.http.converter.StringHttpMessageConverter"/>
        <bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/>
        <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
            <property name="objectMapper" ref="jacksonObjectMapper" />
        </bean>        
    </mvc:message-converters>
</mvc:annotation-driven>

<bean id="jacksonObjectMapper" class="de.Company.backend.web.CompanyObjectMapper" />
24
Andrew Newdigate

Ada org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean untuk waktu yang lama. Mulai dari 1.2 rilis Spring Boot ada org.springframework.http.converter.json.Jackson2ObjectMapperBuilder untuk Java Config.

Dalam konfigurasi Boot String dapat sesederhana:

spring.jackson.deserialization.<feature_name>=true|false
spring.jackson.generator.<feature_name>=true|false
spring.jackson.mapper.<feature_name>=true|false
spring.jackson.parser.<feature_name>=true|false
spring.jackson.serialization.<feature_name>=true|false
spring.jackson.default-property-inclusion=always|non_null|non_absent|non_default|non_empty

di classpath:application.properties atau beberapa kode Java di @Configuration kelas:

@Bean
public Jackson2ObjectMapperBuilder jacksonBuilder() {
    Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
    builder.indentOutput(true).dateFormat(new SimpleDateFormat("yyyy-MM-dd"));
    return builder;
}

Lihat:

15
gavenkoa

Saya telah menggunakan ini dengan Jackson 2.x dan Spring 3.1.2+

servlet-context.xml:

Perhatikan bahwa elemen root adalah <beans:beans>, jadi Anda mungkin perlu menghapus beans dan menambahkan mvc ke beberapa elemen ini tergantung pada pengaturan Anda.

    <annotation-driven>
        <message-converters>
            <beans:bean
                class="org.springframework.http.converter.StringHttpMessageConverter" />
            <beans:bean
                class="org.springframework.http.converter.ResourceHttpMessageConverter" />
            <beans:bean
                class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                <beans:property name="objectMapper" ref="jacksonObjectMapper" />
            </beans:bean>
        </message-converters>
    </annotation-driven>

    <beans:bean id="jacksonObjectMapper"
        class="au.edu.unimelb.atcom.transfer.json.mappers.JSONMapper" />

au.edu.unimelb.atcom.transfer.json.mappers.JSONMapper.Java:

public class JSONMapper extends ObjectMapper {

    public JSONMapper() {
        SimpleModule module = new SimpleModule("JSONModule", new Version(2, 0, 0, null, null, null));
        module.addSerializer(Date.class, new DateSerializer());
        module.addDeserializer(Date.class, new DateDeserializer());
        // Add more here ...
        registerModule(module);
    }

}

DateSerializer.Java:

public class DateSerializer extends StdSerializer<Date> {

    public DateSerializer() {
        super(Date.class);
    }

    @Override
    public void serialize(Date date, JsonGenerator json,
            SerializerProvider provider) throws IOException,
            JsonGenerationException {
        // The client side will handle presentation, we just want it accurate
        DateFormat df = StdDateFormat.getBlueprintISO8601Format();
        String out = df.format(date);
        json.writeString(out);
    }

}

DateDeserializer.Java:

public class DateDeserializer extends StdDeserializer<Date> {

    public DateDeserializer() {
        super(Date.class);
    }

    @Override
    public Date deserialize(JsonParser json, DeserializationContext context)
            throws IOException, JsonProcessingException {
        try {
            DateFormat df = StdDateFormat.getBlueprintISO8601Format();
            return df.parse(json.getText());
        } catch (ParseException e) {
            return null;
        }
    }

}
15
Aram Kocharyan

Saya menemukan solusinya sekarang berdasarkan https://github.com/FasterXML/jackson-module-hibernate

Saya memperluas objek mapper dan menambahkan atribut dalam konstruktor yang diwariskan.

Kemudian mapper objek baru terdaftar sebagai kacang.

<!-- https://github.com/FasterXML/jackson-module-hibernate -->
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="messageConverters">
        <array>
            <bean id="jsonConverter"
            class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
                <property name="objectMapper">
                    <bean class="de.company.backend.spring.PtxObjectMapper"/>
                </property>
            </bean>
        </array>
    </property>
</bean>   
10
Steve Eastwood

Jika Anda ingin menambahkan ObjectMapper kustom untuk mendaftarkan serializers khusus, coba jawaban saya.

Dalam kasus saya (Spring 3.2.4 dan Jackson 2.3.1), konfigurasi XML untuk serializer khusus:

<mvc:annotation-driven>
    <mvc:message-converters register-defaults="false">
        <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
            <property name="objectMapper">
                <bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
                    <property name="serializers">
                        <array>
                            <bean class="com.example.business.serializer.json.CustomObjectSerializer"/>
                        </array>
                    </property>
                </bean>
            </property>
        </bean>
    </mvc:message-converters>
</mvc:annotation-driven>

tidak dijelaskan dengan cara ditimpa kembali ke default oleh sesuatu.

Ini bekerja untuk saya:

CustomObject.Java

@JsonSerialize(using = CustomObjectSerializer.class)
public class CustomObject {

    private Long value;

    public Long getValue() {
        return value;
    }

    public void setValue(Long value) {
        this.value = value;
    }
}

CustomObjectSerializer.Java

public class CustomObjectSerializer extends JsonSerializer<CustomObject> {

    @Override
    public void serialize(CustomObject value, JsonGenerator jgen,
        SerializerProvider provider) throws IOException,JsonProcessingException {
        jgen.writeStartObject();
        jgen.writeNumberField("y", value.getValue());
        jgen.writeEndObject();
    }

    @Override
    public Class<CustomObject> handledType() {
        return CustomObject.class;
    }
}

Tidak ada konfigurasi XML (<mvc:message-converters>(...)</mvc:message-converters>) yang diperlukan dalam solusi saya.

8
user11153

Saya menggunakan Spring 4.1.6 dan Jackson FasterXML 2.1.4.

    <mvc:annotation-driven>
        <mvc:message-converters>
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                <property name="objectMapper">
                    <bean class="com.fasterxml.jackson.databind.ObjectMapper">
                        <!-- 设置不输出null字段-->
                        <property name="serializationInclusion" value="NON_NULL"/>
                    </bean>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

ini berfungsi di config applicationContext.xml saya

5
jecyhw

Saya menggunakan Spring 3.2.4 dan Jackson FasterXML 2.1.1.

Saya telah membuat JacksonObjectMapper kustom yang berfungsi dengan anotasi eksplisit untuk setiap atribut Objek yang dipetakan:

package com.test;
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;

public class MyJaxbJacksonObjectMapper extends ObjectMapper {

public MyJaxbJacksonObjectMapper() {

    this.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY)
            .setVisibility(PropertyAccessor.CREATOR, JsonAutoDetect.Visibility.ANY)
            .setVisibility(PropertyAccessor.SETTER, JsonAutoDetect.Visibility.NONE)
            .setVisibility(PropertyAccessor.GETTER, JsonAutoDetect.Visibility.NONE)
            .setVisibility(PropertyAccessor.IS_GETTER, JsonAutoDetect.Visibility.NONE);

    this.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
    }
}

Maka ini dipakai dalam konfigurasi konteks ( servlet-context.xml ):

<mvc:annotation-driven>
    <mvc:message-converters>

        <beans:bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
            <beans:property name="objectMapper">
                <beans:bean class="com.test.MyJaxbJacksonObjectMapper" />
            </beans:property>
        </beans:bean>

    </mvc:message-converters>
</mvc:annotation-driven>

Ini bekerja dengan baik!

1
Carlos AG

Untuk mengkonfigurasi konverter pesan di spring-web biasa, dalam hal ini untuk mengaktifkan Java 8 JSR-310 JavaTimeModule, Anda harus terlebih dahulu mengimplementasikan WebMvcConfigurer di kelas @Configuration Anda dan kemudian menimpa metode configureMessageConverters:

@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
    ObjectMapper objectMapper = Jackson2ObjectMapperBuilder.json().modules(new JavaTimeModule(), new Jdk8Module()).build()
            .configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
    converters.add(new MappingJackson2HttpMessageConverter(objectMapper));
}

Seperti ini, Anda dapat mendaftarkan ObjectMapper yang didefinisikan khusus dalam konfigurasi Spring berbasis Java.

1
Dormouse

Di atas Spring 4, Anda tidak perlu mengonfigurasi MappingJacksonHttpMessageConverter jika Anda hanya ingin mengonfigurasi ObjectMapper.

(konfigurasi MappingJacksonHttpMessageConverter akan menyebabkan Anda kehilangan MessageConverter lainnya)

Anda hanya perlu melakukan:

public class MyObjectMapper extends ObjectMapper {

    private static final long serialVersionUID = 4219938065516862637L;

    public MyObjectMapper() {
        super();
        enable(SerializationFeature.INDENT_OUTPUT);
    }       
}

Dan dalam konfigurasi Spring Anda, buat kacang ini:

@Bean 
public MyObjectMapper myObjectMapper() {        
    return new MyObjectMapper();
}
1
GMsoF

SOLUSI 1

Solusi kerja pertama (teruji) bermanfaat terutama saat menggunakan @EnableWebMvc:

@Configuration
@EnableWebMvc
public class WebConfig implements WebMvcConfigurer {
    @Autowired
    private ObjectMapper objectMapper;// created elsewhere
    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        // this won't add a 2nd MappingJackson2HttpMessageConverter 
        // as the SOLUTION 2 is doing but also might seem complicated
        converters.stream().filter(c -> c instanceof MappingJackson2HttpMessageConverter).forEach(c -> {
            // check default included objectMapper._registeredModuleTypes,
            // e.g. Jdk8Module, JavaTimeModule when creating the ObjectMapper
            // without Jackson2ObjectMapperBuilder
            ((MappingJackson2HttpMessageConverter) c).setObjectMapper(this.objectMapper);
        });
    }

SOLUSI 2

Tentu saja pendekatan umum di bawah juga berfungsi (juga bekerja dengan @EnableWebMvc):

@Configuration
@EnableWebMvc
public class WebConfig implements WebMvcConfigurer {
    @Autowired
    private ObjectMapper objectMapper;// created elsewhere
    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        // this will add a 2nd MappingJackson2HttpMessageConverter 
        // (additional to the default one) but will work and you 
        // won't lose the default converters as you'll do when overwriting
        // configureMessageConverters(List<HttpMessageConverter<?>> converters)
        // 
        // you still have to check default included
        // objectMapper._registeredModuleTypes, e.g.
        // Jdk8Module, JavaTimeModule when creating the ObjectMapper
        // without Jackson2ObjectMapperBuilder
        converters.add(new MappingJackson2HttpMessageConverter(this.objectMapper));
    }

Mengapa penggunaan @EnableWebMvc menjadi masalah?

@EnableWebMvc menggunakan DelegatingWebMvcConfiguration yang meluas WebMvcConfigurationSupport yang melakukan ini:

if (jackson2Present) {
    Jackson2ObjectMapperBuilder builder = Jackson2ObjectMapperBuilder.json();
    if (this.applicationContext != null) {
        builder.applicationContext(this.applicationContext);
    }
    messageConverters.add(new MappingJackson2HttpMessageConverter(builder.build()));
}

yang berarti bahwa tidak ada cara menyuntikkan ObjectMapper Anda sendiri dengan tujuan mempersiapkannya untuk digunakan untuk membuat MappingJackson2HttpMessageConverter default saat menggunakan @EnableWebMvc.

0
adrhc