springboot升级2.0+ 整合fastjson

<dependency>
         <groupId>com.alibaba</groupId>
         <artifactId>fastjson</artifactId>
         <version>1.2.60/version>
</dependency>

 1 /**
 2  * An implementation of {@link WebMvcConfigurer} with empty methods allowing
 3  * subclasses to override only the methods they‘re interested in.
 4  *
 5  * @author Rossen Stoyanchev
 6  * @since 3.1
 7  * @deprecated as of 5.0 {@link WebMvcConfigurer} has default methods (made
 8  * possible by a Java 8 baseline) and can be implemented directly without the
 9  * need for this adapter
10  */
11 @Deprecated
12 public abstract class WebMvcConfigurerAdapter implements WebMvcConfigurer {}

 1 @Configuration
 2 public class SpringMvcConfigure implements WebMvcConfigurer {
 3  
 4     /**
 5      * 配置消息转换器
 6      * @param converters
 7      */
 8     @Override
 9     public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
10         FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
11         //自定义配置...
12         FastJsonConfig config = new FastJsonConfig();
13         config.setSerializerFeatures(SerializerFeature.QuoteFieldNames,
14                 SerializerFeature.WriteEnumUsingToString,
15                 /*SerializerFeature.WriteMapNullValue,*/
16                 SerializerFeature.WriteDateUseDateFormat,
17                 SerializerFeature.DisableCircularReferenceDetect);
18         fastJsonHttpMessageConverter.setFastJsonConfig(config);
19         converters.add(fastJsonHttpMessageConverter);
20     }
21  
22 }

 1 @Override
 2 public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
 3     converters = converters.stream()
 4                 .filter((converter)-> !(converter instanceof MappingJackson2HttpMessageConverter))
 5                 .collect(Collectors.toList());
 6     FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
 7     //自定义配置...
 8     FastJsonConfig config = new FastJsonConfig();
 9     config.setSerializerFeatures(SerializerFeature.QuoteFieldNames,
10             SerializerFeature.WriteEnumUsingToString,
11             /*SerializerFeature.WriteMapNullValue,*/
12             SerializerFeature.WriteDateUseDateFormat,
13             SerializerFeature.DisableCircularReferenceDetect);
14     fastJsonHttpMessageConverter.setFastJsonConfig(config);
15     converters.add(fastJsonHttpMessageConverter);
16 }

 1 @Configuration
 2 public class SpringWebMvcConfigurer implements WebMvcConfigurer {
 3 
 4     private final Logger logger = LoggerFactory.getLogger(SpringWebMvcConfigurer.class);
 5 
 6     //使用阿里 FastJson 作为JSON MessageConverter
 7     @Override
 8     public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
 9 
10          /*
11          先把JackSon的消息转换器删除.
12          备注: (1)源码分析可知，返回json的过程为:
13                     Controller调用结束后返回一个数据对象，for循环遍历conventers，找到支持application/json的HttpMessageConverter，然后将返回的数据序列化成json。
14                     具体参考org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor的writeWithMessageConverters方法
15                (2)由于是list结构，我们添加的fastjson在最后。因此必须要将jackson的转换器删除，不然会先匹配上jackson，导致没使用fastjson
16         */
17         for (int i = converters.size() - 1; i >= 0; i--) {
18             if (converters.get(i) instanceof MappingJackson2HttpMessageConverter) {
19                 converters.remove(i);
20             }
21         }
22 
23         FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
24         FastJsonConfig config = new FastJsonConfig();
25         config.setSerializerFeatures(
26                 SerializerFeature.WriteMapNullValue,//保留空的字段
27                 SerializerFeature.WriteNullStringAsEmpty,//String null -> ""
28                 SerializerFeature.WriteNullNumberAsZero,//Number null -> 0
29                 SerializerFeature.WriteDateUseDateFormat);//日期格式化
30 
31         converter.setFastJsonConfig(config);
32         converter.setDefaultCharset(Charset.forName("UTF-8"));
33         converters.add(converter);
34     }
35 }