问题形容
fastjson通过代码指定全局序列化返回工夫格局，导致应用JSONField注解标注属性的非凡日期返回格局生效
应用版本
| 利用名称 | 版本 |
|---|---|
| springboot | 2.0.0.RELEASE |
| fastjson | 1.2.83 |
全局设置代码
public class WebConfig implements WebMvcConfigurer { @Override public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { //1.须要定义一个convert转换音讯的对象; FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter(); //2.增加fastJson的配置信息，比方：是否要格式化返回的json数据; FastJsonConfig fastJsonConfig = new FastJsonConfig(); //全局指定了日期格局 fastJsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss"); //3解决中文乱码问题 List<MediaType> fastMediaTypes = new ArrayList<>(); fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8); //4.在convert中增加配置信息. fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes); fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig); //5.将convert增加到converters当中. converters.add(fastJsonHttpMessageConverter); }}属性设置代码
@JSONField(format = "yyyy-MM-dd") private Date addDate;返回后果
申请接口后addDate字段返回的格局为2022-12-17 13:26:45，依然为全局日期格局，并不设置JSONField后冀望的2022-12-17格局
解决方案
对立扫描
系统启动时扫描对应基类的子类，通过反射获取标注了JSONField注解的字段并获取对应的format值
public class FastJsonUtil { private static HashMap<String, String> dateMap = new HashMap(); public static void scanDate2Json(Class runtimeClass, List<String> extraPackageNameList) { List<Class> filterClassList = new ArrayList<>(); filterClassList.add(BaseSystemObject.class); List<Class<?>> scanClassList = new ArrayList<>(); if (!runtimeClass.getPackage().getName().equals(Application.class.getPackage().getName())) { scanClassList.addAll(ScanUtil.getAllClassByPackageName(runtimeClass.getPackage(), filterClassList)); } for (String packageName : extraPackageNameList) { scanClassList.addAll(ScanUtil.getAllClassByPackageName(packageName, filterClassList)); } for (Class clazz : scanClassList) { List<Field> fs = Arrays.asList(clazz.getDeclaredFields()); for (Field field : fs) { field.setAccessible(true); if (field.getType() == Date.class) { JSONField jsonField = field.getAnnotation(JSONField.class); if (jsonField != null && !StringUtil.isEmpty(jsonField.format())) { dateMap.put(clazz.getName() + "|" + field.getName(), jsonField.format()); } } } } } public static boolean checkDate2Json(String key){ return dateMap.containsKey(key); } public static String getDate2JsonFormat(String key){ return dateMap.get(key); }}对立批改
实现fastjson的扩大过滤器ValueFilter进行序列化后的值批改，并注册到配置中去
public class FastJsonPropertyValueFilter implements ValueFilter { @Override public Object process(Object source, String name, Object value) { String key = source.getClass().getName() + "|" + name; if (value != null && FastJsonUtil.checkDate2Json(key)) { String format = FastJsonUtil.getDate2JsonFormat(key); DateFormat df = new SimpleDateFormat(format); return df.format(value); } return value; }}public class WebConfig implements WebMvcConfigurer { @Override public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { //1.须要定义一个convert转换音讯的对象; FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter(); //2.增加fastJson的配置信息，比方：是否要格式化返回的json数据; FastJsonConfig fastJsonConfig = new FastJsonConfig(); //全局指定了日期格局 fastJsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss"); //指定json返回规定 fastJsonConfig.setSerializeFilters(new FastJsonPropertyValueFilter()); //3解决中文乱码问题 List<MediaType> fastMediaTypes = new ArrayList<>(); fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8); //4.在convert中增加配置信息. fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes); fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig); //5.将convert增加到converters当中. converters.add(fastJsonHttpMessageConverter); }}