Configurare Gson in primavera prima di utilizzare GsonHttpMessageConverter

Question

Come configurare Gson prima di costruire uno GsonHttpMessageConverter?

Devo usare @Expose e specificare il formato della data.

Answer 1

(New Method) Utilizzo di Java Config

Extend WebMvcConfigurerAdapter o se avete bisogno di più l'uso di controllo WebMvcConfigurationSupport.

@Configuration 
@EnableWebMvc 
public class WebMvcConfig extends WebMvcConfigurerAdapter { 

    @Override 
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { 
     converters.add(createGsonHttpMessageConverter()); 
     super.configureMessageConverters(converters); 
    } 

    private GsonHttpMessageConverter createGsonHttpMessageConverter() { 
     Gson gson = new GsonBuilder() 
       .excludeFieldsWithoutExposeAnnotation() 
       .setDateFormat("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'SSS'Z'") 
       .create(); 

     GsonHttpMessageConverter gsonConverter = new GsonHttpMessageConverter(); 
     gsonConverter.setGson(gson); 

     return gsonConverter; 
    } 

} 

Ulteriori informazioni su customize provided configuration.

(Old Method) Utilizzo di configurazione XML

Nel contesto DispatcherServlet:

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

    <bean id="gsonBuilder" class="com.google.gson.GsonBuilder"> 
     <property name="dateFormat" value="yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'SSS'Z'" /> 
    </bean> 

    <bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean"> 
     <property name="targetObject" ref="gsonBuilder" /> 
     <property name="targetMethod" value="excludeFieldsWithoutExposeAnnotation" /> 
    </bean> 

    <mvc:annotation-driven> 
     <mvc:message-converters> 
      <bean class="org.springframework.http.converter.json.GsonHttpMessageConverter"> 
       <property name="gson"> 
        <bean class="com.google.gson.Gson" factory-bean="gsonBuilder" factory-method="create" /> 
       </property> 
      </bean> 
     </mvc:message-converters> 
    </mvc:annotation-driven> 

</beans>