springboot配置fastjson

1.引入依赖

<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
      <exclusions>
          <exclusion>
              <groupId>com.fasterxml.jackson.core</groupId>
              <artifactId>jackson-databind</artifactId>
          </exclusion>
      </exclusions>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.57</version>
 </dependency>

解释：springboot默认使用Jackson-databind作为JSON处理器，使用fastjson就需要先剔除jackson-databind

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2.fastjson自定义配置(有两种方式)
方式一：

@Configuration
public class MyFastJsonConfig {

    @Bean
    FastJsonHttpMessageConverter fastJsonHttpMessageConverter(){
        FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
        FastJsonConfig config = new FastJsonConfig();
        config.setDateFormat("yyyy-MM-dd");
        config.setCharset(Charset.forName("UTF-8"));
        config.setSerializerFeatures(
                //输出类名
                SerializerFeature.WriteClassName,
                //输出map中value为null的数据
                SerializerFeature.WriteMapNullValue,
                //json格式化
                SerializerFeature.PrettyFormat,
                //输出空list为[]，而不是null
                SerializerFeature.WriteNullListAsEmpty,
                //输出空string为""，而不是null
                SerializerFeature.WriteNullStringAsEmpty
        );
        converter.setFastJsonConfig(config);
        return converter;
    }
}

方式二：

@Configuration
public class MyWebMvcConfig implements WebMvcConfigurer {

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
        FastJsonConfig config = new FastJsonConfig();
        config.setDateFormat("yyyy-MM-dd");
        config.setCharset(Charset.forName("UTF-8"));
        config.setSerializerFeatures(
                //输出类名
                SerializerFeature.WriteClassName,
                //输出map中value为null的数据
                SerializerFeature.WriteMapNullValue,
                //json格式化
                SerializerFeature.PrettyFormat,
                //输出空list为[]，而不是null
                SerializerFeature.WriteNullListAsEmpty,
                //输出空string为""，而不是null
                SerializerFeature.WriteNullStringAsEmpty
        );
        converter.setFastJsonConfig(config);
        converters.add(converter);
    }
}

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3.application.properties额外配置

#设置响应编码
spring.http.encoding.force-response=true

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4.测试

• 先定义一个model

@Getter
@Setter
@AllArgsConstructor
public class Book {
    private String name;
    private String author;
    protected float price;
    private Date date;
}

• 定义路由

@RestController
public class BookController {

    @GetMapping("/book")
    public Book book(){
        return new Book("小罗","小三",30f,new Date());
    }
}

• 接口调用
  使用浏览器访问http://localhost:8080/book,页面展示如下：

{ "@type":"com.xzl.spire.model.Book", "author":"小三", "date":"2020-11-08", "name":"小罗", "price":30.0F }

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5.Gson配置
Gson配置请看文章：springboot配置Gson