1@Configuration
2@EnableWebMvc
3public class WebMvcConfigurer extends WebMvcConfigurerAdapter {
4    /**
5     * fastjson configuration
6     */
7    @Override
8    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
9        FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
10        FastJsonConfig config = new FastJsonConfig();
11        config.setSerializerFeatures(SerializerFeature.WriteNullListAsEmpty, SerializerFeature.WriteMapNullValue, SerializerFeature.WriteNullStringAsEmpty);
12        config.setSerializeFilters((ValueFilter) (object, name, value) -> {
13            // 针对map类型value为null时输出""
14            if (Objects.isNull(value)) {
15                return "";
16            }
17            // 数字类型转字符串
18            if (value instanceof Number) {
19                return value.toString();
20            }
21            return value;
22        });
23        ArrayList<MediaType> mediaTypes = Lists.newArrayList();
24        mediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
25        mediaTypes.add(MediaType.TEXT_HTML);
26        mediaTypes.add(MediaType.APPLICATION_JSON);
27        mediaTypes.add(MediaType.TEXT_PLAIN);
28        converter.setSupportedMediaTypes(mediaTypes);
29        converter.setFastJsonConfig(config);
30        // 自定义序列化
31        config.getSerializeConfig().put(Response.class, new ResponseSerializer(config));
32        converters.add(converter);
33    }
34}

自定义序列化实现ObjectSerializer 接口

1    public static class ResponseSerializer implements ObjectSerializer {
2        private final FastJsonConfig fastJsonConfig;
3
4        public ResponseSerializer(FastJsonConfig fastJsonConfig) {
5            this.fastJsonConfig = fastJsonConfig;
6        }
7
8        @Override
9        public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features) throws IOException {
10            SerializeWriter out = serializer.getWriter();
11            Response response = (Response) object;
12            out.write(JSON.toJSONString(response.body, fastJsonConfig.getSerializeConfig(), fastJsonConfig.getSerializeFilters(), fastJsonConfig.getSerializerFeatures()));
13        }
14    }

jsonp注解支持

fastjson已经内置了一个ResponseBodyAdvice接口的实现JSONPResponseBodyAdvice 我们只需要配置这个Bean就行了

1@Configuration
2@EnableWebMvc
3public class WebMvcConfigurer extends WebMvcConfigurerAdapter {
4    /**
5     * use {@link ResponseJSONP}
6     * controller return jsonp data
7     */
8    @Bean
9    public ResponseBodyAdvice fastJsonpResponseBodyAdvice() {
10        return new JSONPResponseBodyAdvice();
11    }
12}