在使用GsonHttpMessageConverter之前，在Spring中配置Gson [英] Configure Gson in Spring before using GsonHttpMessageConverter

问题描述

如何配置 Gson 构建 GsonHttpMessageConverter ？

我需要使用 @ Expose 并指定日期格式。 （新方法）使用Java配置

扩展 WebMvcConfigurerAdapter 或者如果您需要更多控制，请使用 WebMvcConfigurationSupport 。

  @Configuration 
 @EnableWebMvc 
 public class WebMvcConfig extends WebMvcConfigurerAdapter {
 
 @Override 
 public void configureMessageConverters（List< HttpMessageConverter<>>转换器）{
 converters.add（createGsonHttpMessageConverter（））; 
 super.configureMessageConverters（转换器）; 
 
 $ b $ 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）; 
 
返回gsonConverter; 
} 
 
} 
  

您可以阅读更多关于如何自定义提供的配置。
$ b

（旧方法）使用XML配置

在DispatcherServlet上下文中：

 <？xml version =1.0encoding =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/豆/弹簧beans.xsd> 
 
< bean id =gsonBuilderclass =com.google.gson.GsonBuilder> 
< property name =dateFormatvalue =yyyy' - 'MM' - 'dd'T'HH'：'mm'：'ss'。'SSS'Z'/> 
< / bean> 
 
< bean class =org.springframework.beans.factory.config.MethodInvokingFactoryBean> 
< property name =targetObjectref =gsonBuilder/> 
< property name =targetMethodvalue =excludeFieldsWithoutExposeAnnotation/> 
< / bean> 
 
< mvc：注释驱动> 
< mvc：message-converters> 
< bean class =org.springframework.http.converter.json.GsonHttpMessageConverter> 
< property name =gson> 
< bean class =com.google.gson.Gsonfactory-bean =gsonBuilderfactory-method =create/> 
< / property> 
< / bean> 
< / mvc：message-converters> 
< / mvc：注释驱动> 
 
< / beans> 
  

How to configure Gson before constructing a GsonHttpMessageConverter?

I need to use @Expose and specify Date format.

解决方案

(New Method) Using Java Config

Extend WebMvcConfigurerAdapter or if you need more control use 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;
    }

}

You can read more on how to customize provided configuration.

(Old Method) Using XML configuration

In DispatcherServlet context:

<?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>

这篇关于在使用GsonHttpMessageConverter之前，在Spring中配置Gson的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！