@Bean
public FastJsonHttpMessageConverter fastJsonHttpMessageConverter() {
    FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
    FastJsonConfig fastJsonConfig = new FastJsonConfig();
    fastJsonConfig.setSerializerFeatures(
            SerializerFeature.PrettyFormat,
            SerializerFeature.WriteClassName,
            SerializerFeature.WriteMapNullValue
    );
    List<MediaType> fastMediaTypes = new ArrayList<MediaType>();
    fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);

    fastJsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss");
    ValueFilter valueFilter = new ValueFilter() {
        public Object process(Object o, String s, Object o1) {
            if (null == o1) {
                o1 = "";
            }
            return o1;
        }
    };
    fastJsonConfig.setSerializeFilters(valueFilter);
    converter.setSupportedMediaTypes(fastMediaTypes);
    converter.setFastJsonConfig(fastJsonConfig);
    return converter;
}
 

/**
 * 获取项目中定义的ValueFilter实现类列表
 * 通过BeanFactory读取本项目的Base Package List
 *
 * @return ValueFilter数组
 */
ValueFilter[] getDefineFilters(List<String> packages) {
    Set<Class> filterClass = new HashSet<>();
    if (ObjectUtils.isEmpty(packages)) {
        return new ValueFilter[]{};
    }
    // 读取所有package下的ValueFilter实现类
    packages.stream().forEach(pack -> filterClass.addAll((Collection<? extends Class>) ClassTools.getSubClassList(pack, ValueFilter.class)));
    List<ValueFilter> filters = new LinkedList<>();
    filterClass.stream().forEach(filter -> {
        try {
            filters.add((ValueFilter) filter.newInstance());
        } catch (Exception e) {
            logger.error("ValueFilter new instance have error.", e);
        }
    });
    logger.info("Loaded ValueFilter : {}", filterClass.toString());
    return filters.toArray(new ValueFilter[]{});
}
 

public static String filterSensitiveField(Meta meta) {
	final Storage storage = meta.findStorage(Storage.MYSQL);

	return JSON.toJSONString(meta, JSON_CFG, new ValueFilter() {
		@Override
		@SuppressWarnings("unchecked")
		public Object process(Object owner, String fieldName, Object fieldValue) {
			if (storage != null && owner instanceof Datasource && fieldValue instanceof Map) {
				for (Datasource d : storage.getDatasources()) {
					if (d.getId().equals(((Datasource) owner).getId())) {
						Map<String, Property> newFieldValue = new HashMap<String, Property>();
						for (Entry<String, Property> entry : ((Map<String, Property>) fieldValue).entrySet()) {
							newFieldValue.put(entry.getKey(), new Property(entry.getKey()).setValue("**********"));
						}
						return newFieldValue;
					}
				}
			}
			return fieldValue;
		}
	});
}
 

@Bean
public FastJsonHttpMessageConverter fastJsonHttpMessageConverter() {
    FastJsonHttpMessageConverter httpMessageConverter = new FastJsonHttpMessageConverter();
    FastJsonConfig fastJsonConfig = new FastJsonConfig();
    fastJsonConfig.setSerializerFeatures(SerializerFeature.QuoteFieldNames,
            SerializerFeature.WriteEnumUsingToString,
            SerializerFeature.WriteMapNullValue,
            SerializerFeature.WriteDateUseDateFormat);
    fastJsonConfig.setSerializeFilters(new ValueFilter() {
        @Override
        public Object process(Object o, String s, Object source) {
            if (source == null) {
                return "";
            }
            if (source instanceof Date) {
                return ((Date) source).getTime();
            }
            return source;
        }
    });
    httpMessageConverter.setFastJsonConfig(fastJsonConfig);
    return httpMessageConverter;
}
 

@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
    FastJsonHttpMessageConverter httpMessageConverter = new FastJsonHttpMessageConverter();
    FastJsonConfig fastJsonConfig = new FastJsonConfig();
    fastJsonConfig.setSerializerFeatures(SerializerFeature.QuoteFieldNames,
            SerializerFeature.WriteEnumUsingToString,
            SerializerFeature.WriteMapNullValue,
            SerializerFeature.WriteDateUseDateFormat);
    fastJsonConfig.setSerializeFilters(new ValueFilter() {
        @Override
        public Object process(Object o, String s, Object source) {
            if (source == null) {
                return "";
            }
            if (source instanceof Date) {
                return ((Date) source).getTime();
            }
            return source;
        }
    });
    httpMessageConverter.setFastJsonConfig(fastJsonConfig);
    converters.add(httpMessageConverter);
}
 

/**
 * fastjson的配置
 */
public FastJsonConfig fastjsonConfig() {
    FastJsonConfig fastJsonConfig = new FastJsonConfig();
    fastJsonConfig.setSerializerFeatures(
            SerializerFeature.PrettyFormat,
            SerializerFeature.WriteMapNullValue,
            SerializerFeature.WriteEnumUsingToString
    );
    fastJsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss");
    ValueFilter valueFilter = new ValueFilter() {
        public Object process(Object o, String s, Object o1) {
            if (null == o1) {
                o1 = "";
            }
            return o1;
        }
    };
    fastJsonConfig.setCharset(Charset.forName("utf-8"));
    fastJsonConfig.setSerializeFilters(valueFilter);

    //解决Long转json精度丢失的问题
    SerializeConfig serializeConfig = SerializeConfig.globalInstance;
    serializeConfig.put(BigInteger.class, ToStringSerializer.instance);
    serializeConfig.put(Long.class, ToStringSerializer.instance);
    serializeConfig.put(Long.TYPE, ToStringSerializer.instance);
    fastJsonConfig.setSerializeConfig(serializeConfig);
    return fastJsonConfig;
}
 

/**
 * fastjson的配置
 */
public FastJsonConfig fastjsonConfig() {
    FastJsonConfig fastJsonConfig = new FastJsonConfig();
    fastJsonConfig.setSerializerFeatures(
            SerializerFeature.PrettyFormat,
            SerializerFeature.WriteMapNullValue,
            SerializerFeature.WriteEnumUsingToString,
            SerializerFeature.DisableCircularReferenceDetect
    );
    fastJsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss");
    ValueFilter valueFilter = new ValueFilter() {
        @Override
        public Object process(Object o, String s, Object o1) {
            if (null == o1) {
                o1 = "";
            }
            return o1;
        }
    };
    fastJsonConfig.setCharset(Charset.forName("utf-8"));
    fastJsonConfig.setSerializeFilters(valueFilter);

    //解决Long转json精度丢失的问题
    SerializeConfig serializeConfig = SerializeConfig.globalInstance;
    serializeConfig.put(BigInteger.class, ToStringSerializer.instance);
    serializeConfig.put(Long.class, ToStringSerializer.instance);
    serializeConfig.put(Long.TYPE, ToStringSerializer.instance);
    fastJsonConfig.setSerializeConfig(serializeConfig);
    return fastJsonConfig;
}
 

@Bean
@ConditionalOnMissingBean({ FastJsonHttpMessageConverter4.class })
//当没有注册这个类时，自动注册Bean
public FastJsonHttpMessageConverter4 fastJsonHttpMessageConverter() {
    FastJsonHttpMessageConverter4 converter = new FastJsonHttpMessageConverter4();

    //使用最新的官方推荐配置对象的方式来注入fastjson的序列化特征
    FastJsonConfig fastJsonConfig = new FastJsonConfig();
    fastJsonConfig.setSerializerFeatures(
            SerializerFeature.WriteDateUseDateFormat,
            SerializerFeature.WriteNullListAsEmpty,
            SerializerFeature.WriteMapNullValue,
            SerializerFeature.WriteNullBooleanAsFalse,
            SerializerFeature.WriteNullStringAsEmpty
     );
    
    //添加对json值的过滤，因为像移动APP，服务端在传json值时最好不要传null，而是使用“”，这是一个演示
    ValueFilter valueFilter = new ValueFilter() {//5
        //o 是class
        //s 是key值
        //o1 是value值
        public Object process(Object o, String s, Object o1) {
            if (null == o1) {
                o1 = "";
            }
            return o1;
        }
    };
    fastJsonConfig.setSerializeFilters(valueFilter);

    converter.setFastJsonConfig(fastJsonConfig);

    return converter;
}
 

public String toJSONString(Object object, SerializeFilter filter, SerializerFeature[] features) {
    SerializeWriter out = new SerializeWriter();

    try {
        JSONSerializer serializer = new JSONSerializer(out, fastJsonConfig.serializeConfig);
        if (features != null) {
            for (SerializerFeature feature : features) {
                serializer.config(feature, true);
            }
        }

        if (filter != null) {
            if (filter instanceof PropertyPreFilter) {
                serializer.getPropertyPreFilters().add((PropertyPreFilter) filter);
            }

            if (filter instanceof NameFilter) {
                serializer.getNameFilters().add((NameFilter) filter);
            }

            if (filter instanceof ValueFilter) {
                serializer.getValueFilters().add((ValueFilter) filter);
            }

            if (filter instanceof PropertyFilter) {
                serializer.getPropertyFilters().add((PropertyFilter) filter);
            }

            if (filter instanceof BeforeFilter) {
                serializer.getBeforeFilters().add((BeforeFilter) filter);
            }

            if (filter instanceof AfterFilter) {
                serializer.getAfterFilters().add((AfterFilter) filter);
            }
        }

        serializer.write(object);

        return out.toString();
    } finally {
        out.close();
    }
}