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HTTP的序列化和反序列化

作者:互联网

Netty中的Decoder和Encoder就有两种基本层次,层次低的一种是Byte <—> Message,二进制与程序内部消息对象之间的转换,就是常见的序列化/反序列化;另外一种是 Message <—> Message,程序内部对象之间的转换,比较高层次的序列化/反序列化。

Http协议的处理过程,TCP字节流 <—> HttpRequest/HttpResponse <—> 内部对象,就涉及这两种序列化。在springmvc中第一步已经由Servlet容器(tomcat等等)帮我们处理了,第二步则主要由框架帮我们处理。上面所说的Http序列化/反序列化就是指的这第二个步骤,它是controller层框架的核心功能之一,有了这个功能,就能大大减少代码量,让controller的逻辑更简洁清晰,就像上面示意的代码那样,方法中只有一行代码。spirngmvc进行第二步操作,也就是Http序列化和反序列化的核心是HttpMessageConverter。

Springboot配置FastJsonHttpMessageConverter有两种方法:

方法1

启动类继承extends WebMvcConfigurerAdapter,然后覆盖方法configureMessageConverters

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.apache.log4j.Logger;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.web.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import java.util.ArrayList;
import java.util.List;

/** springboot以fastjon方式转化json数据 */
@SpringBootApplication
public class Application extends WebMvcConfigurerAdapter {
    private static Logger logger = Logger.getLogger(Application.class);

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        super.configureMessageConverters(converters);
        //1.需要定义一个convert转换消息的对象;
        FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
        //2.添加fastJson的配置信息,比如:是否要格式化返回的json数据;
        FastJsonConfig fastJsonConfig = new FastJsonConfig();

	SerializerFeature[] serializerFeatures = new SerializerFeature[]{
                //    输出key是包含双引号
//                SerializerFeature.QuoteFieldNames,
                //    是否输出为null的字段,若为null 则显示该字段
//                SerializerFeature.WriteMapNullValue,
                //    数值字段如果为null,则输出为0
                SerializerFeature.WriteNullNumberAsZero,
                //     List字段如果为null,输出为[],而非null
                SerializerFeature.WriteNullListAsEmpty,
                //    字符类型字段如果为null,输出为"",而非null
                SerializerFeature.WriteNullStringAsEmpty,
                //    Boolean字段如果为null,输出为false,而非null
                SerializerFeature.WriteNullBooleanAsFalse,
                //    Date的日期转换器
                SerializerFeature.WriteDateUseDateFormat,
                //    循环引用
                SerializerFeature.DisableCircularReferenceDetect,
        };

        fastJsonConfig.setSerializerFeatures(serializerFeatures);
        //3处理中文乱码问题
        List<MediaType> fastMediaTypes = new ArrayList<>();
        fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
        //4.在convert中添加配置信息.
        fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes);
        fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);
        //5.将convert添加到converters当中.
        converters.add(fastJsonHttpMessageConverter);
    }

    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
        logger.info("=====spring boot start success====");
    }
}

方法2

添加配置类来注入Bean:HttpMessageConverters

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
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 java.nio.charset.Charset;

@Configuration
public class HttpMessageConverterConfig {

    //引入Fastjson解析json,不使用默认的jackson
    //必须在pom.xml引入fastjson的jar包,并且版必须大于1.2.10
    @Bean
    public HttpMessageConverters fastJsonHttpMessageConverters() {
        //1、定义一个convert转换消息的对象
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();

        //2、添加fastjson的配置信息
        FastJsonConfig fastJsonConfig = new FastJsonConfig();

        SerializerFeature[] serializerFeatures = new SerializerFeature[]{
                //    输出key是包含双引号
//                SerializerFeature.QuoteFieldNames,
                //    是否输出为null的字段,若为null 则显示该字段
//                SerializerFeature.WriteMapNullValue,
                //    数值字段如果为null,则输出为0
                SerializerFeature.WriteNullNumberAsZero,
                //     List字段如果为null,输出为[],而非null
                SerializerFeature.WriteNullListAsEmpty,
                //    字符类型字段如果为null,输出为"",而非null
                SerializerFeature.WriteNullStringAsEmpty,
                //    Boolean字段如果为null,输出为false,而非null
                SerializerFeature.WriteNullBooleanAsFalse,
                //    Date的日期转换器
                SerializerFeature.WriteDateUseDateFormat,
                //    循环引用
                SerializerFeature.DisableCircularReferenceDetect,
        };

        fastJsonConfig.setSerializerFeatures(serializerFeatures);
        fastJsonConfig.setCharset(Charset.forName("UTF-8"));

        //3、在convert中添加配置信息
        fastConverter.setFastJsonConfig(fastJsonConfig);

        //4、将convert添加到converters中
        HttpMessageConverter<?> converter = fastConverter;

        return new HttpMessageConverters(converter);
    }
}

标签:序列化,HTTP,springframework,SerializerFeature,org,import,null
来源: https://www.cnblogs.com/KJee26/p/15060137.html