spring中配置fastjson作为默认的json实现 (原创)

spring中配置fastjson作为默认的json实现，替换默认的jackson。

 1、WebConfig配置类：

import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

 
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {

    /**
     * 配置全站允许CORS跨域访问
     */
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("*") //允许的来源域  如http://www.demo.com
                .allowedMethods("GET", "POST","PUT","DELETE","PUT")
                .allowCredentials(false).maxAge(3600);
    }


    /**
     * 替换springmvc中jackson为fastjson
     * @param converters
     */
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        super.configureMessageConverters(converters);

        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();

//        FastJsonConfig fastJsonConfig = new FastJsonConfig();
//        fastJsonConfig.setSerializerFeatures(
//                SerializerFeature.PrettyFormat,
//                SerializerFeature.WriteMapNullValue,
//                SerializerFeature.WriteNullNumberAsZero,
//                SerializerFeature.WriteNullStringAsEmpty
//        );
//         fastConverter.setFastJsonConfig(fastJsonConfig);

        // 处理中文乱码问题
        List<MediaType> fastMediaTypes = new ArrayList<>();

        fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
        fastConverter.setSupportedMediaTypes(fastMediaTypes);

        //处理字符串, 避免直接返回字符串的时候被添加了引号
        StringHttpMessageConverter stringConverter = new StringHttpMessageConverter(Charset.forName("UTF-8"));
        converters.add(stringConverter);
        converters.add(fastConverter);
    }
}

  使用fastjson中提供的@JSONField注解，设置bean中字段的json输出名称，如：

import com.alibaba.fastjson.annotation.JSONField;
import lombok.Getter;
import lombok.Setter;
import java.io.Serializable;
@Getter
@Setter
public class UserInfo implements Serializable {
    private static final long serialVersionUID = 7104959704215437045L;
 
    @JSONField(name = "FullName")
    private String FullName; //姓名
    @JSONField(name = "UserPhone")
    private String UserPhone; //手机号 
 
   //...

}