SpringBoot+jpa+hibernate返回json数据实现按需加载数据

springboot-hibernate-json-lazyload

- import jar

```
<dependency>
        <groupId>com.fasterxml.jackson.datatype</groupId>
        <artifactId>jackson-datatype-hibernate5</artifactId>
        <version>2.9.0.pr4</version>
</dependency>
```

- MappingJackson2HttpMessageConverter

```
@Bean
public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() {
    MappingJackson2HttpMessageConverter jsonConverter = new MappingJackson2HttpMessageConverter();
    ObjectMapper objectMapper = jsonConverter.getObjectMapper();
    objectMapper.registerModule(new Hibernate5Module());

    return jsonConverter;
}
```