在Spring Boot Project中启用Multimap的json序列化 [英] Enable json serialization of Multimap in Spring Boot Project
问题描述
我想在Spring Boot应用程序中序列化一些Google guava Multimap.
I want to serialize some google guava Multimap in a spring boot application.
public class SomeDTO {
@JsonProperty
Multimap<A, B> prop = HashMultimap.create();
}
不使用自定义的杰克逊序列化器,我会得到类似
Without using a customized jackson serializer, I get some result like
{
"prop ":
{
"empty": false
}
}
这是definitley,不是我想要得到的.我想到了类似的东西:
Which is definitley not what I seek to get. I thought of something like:
{
"nodes": {
"key0": [
{
"prop0": 2,
"prop1": 4
},
{
"prop0": 5,
"prop1": 6
}
],
"key1": [
{
"prop0": 23,
"prop1": 0
}
]
}
}
添加
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-guava</artifactId>
<version>${jackson.version}</version>
</dependency>
到pom.xml似乎还不够...但是,我只是从整个春季开始//关键的宇宙,所以我想我会想念一些明显的东西.
to the pom.xml seems not sufficient... However, I'm just starting with this whole spring // pivotal universe, so I guess I miss something obvious.
推荐答案
我想出的解决方案是在主@Configuration
中简单地添加@Bean
:
The solution i came up with is simply adding a @Bean
to my main @Configuration
:
import com.fasterxml.jackson.databind.Module;
import com.fasterxml.jackson.datatype.guava.GuavaModule;
// More-obvious imports missing
@Configuration
@EnableAutoConfiguration
@ComponentScan
public class Application extends SpringBootServletInitializer {
public static void main(final String[] args) {
SpringApplication.run(Application.class, args);
}
@Override
protected final SpringApplicationBuilder configure(final SpringApplicationBuilder application) {
return application.sources(Application.class);
}
@Bean
ObjectMapper customizeJacksonConfiguration() {
ObjectMapper om = new ObjectMapper();
om.registerModule(new GuavaModule());
return om;
}
}
Afaik,ObjectMapper
Bean方法有一个缺点:每次以此方式创建ObjectMapper时,所有先前的配置都会被丢弃.
Afaik, the ObjectMapper
Bean approach has one drawback: Everytime an ObjectMapper is created this way, all previous configuration gets thrown away.
如果您想向杰克逊添加模块-而不是覆盖以前的配置,这种方法更好:
If you want to add a module to jackson - instead of overriding previous configuration, this approach is better:
import com.fasterxml.jackson.databind.Module;
import com.fasterxml.jackson.datatype.guava.GuavaModule;
// More-obvious imports missing
@Configuration
@EnableAutoConfiguration
@ComponentScan
public class Application extends SpringBootServletInitializer {
public static void main(final String[] args) {
SpringApplication.run(Application.class, args);
}
@Override
protected final SpringApplicationBuilder configure(final SpringApplicationBuilder application) {
return application.sources(Application.class);
}
@Bean
public Module guavaModule() {
return new GuavaModule();
}
}
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