Spring-boot: 配置Gson作为Controller的

Jackson一直是spring.framework默认的json库, 不过我们有时候会希望配置Gson为controller的消息转换器, 以便用到Gson一些便利feature(例如各种方便的注解). 幸好, 从4.1版本后spring添加了对GsonHttpMessageConverter的支持. 配置方法很简单, 下面给出Spring-boot, Java和XML配置方式.

在Spring-boot自定义Configuration:

package com.abc;

import org.springframework.boot.autoconfigure.web.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.GsonHttpMessageConverter;

import java.util.ArrayList;
import java.util.Collection;

/**
 * @author kami.wm
 */
@Configuration
public class CustomConfiguration {

    @Bean
    public HttpMessageConverters customConverters() {
        Collection<HttpMessageConverter<?>> messageConverters = new ArrayList<>();
        GsonHttpMessageConverter gsonHttpMessageConverter = new GsonHttpMessageConverter();
        messageConverters.add(gsonHttpMessageConverter);
        return new HttpMessageConverters(true, messageConverters);
    }
}

通过Java配置

@Configuration
@EnableWebMvc
public class Application extends WebMvcConfigurerAdapter {

    @Override
    public void configureMessageConverters(List<HttpMessageConverter < ? >> converters) {
        GsonHttpMessageConverter gsonHttpMessageConverter = new GsonHttpMessageConverter();
        converters.add(gsonHttpMessageConverter);
    }
}

在XML配置文件中配置:

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