fastjson全局日期序列化设置导致JSONField无效
问题描述
fastjson通过代码指定全局序列化返回时间格式,导致使用JSONField注解标注属性的特殊日期返回格式失效
使用版本
应用名称 | 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.需要定义一个convert转换消息的对象;
FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
//2.添加fastJson的配置信息,比如:是否要格式化返回的json数据;
FastJsonConfig fastJsonConfig = new FastJsonConfig();
//全局指定了日期格式
fastJsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss");
//3处理中文乱码问题
List<MediaType> fastMediaTypes = new ArrayList<>();
fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
//4.在convert中添加配置信息.
fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes);
fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);
//5.将convert添加到converters当中.
converters.add(fastJsonHttpMessageConverter);
}
}
属性设置代码
@JSONField(format = "yyyy-MM-dd")
private Date addDate;
返回结果
请求接口后addDate字段返回的格式为2022-12-17 13:26:45,仍然为全局日期格式,并不设置JSONField后期望的2022-12-17格式
解决方案
统一扫描
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);
}
}
统一修改
实现fastjson的扩展过滤器ValueFilter进行序列化后的值修改,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.需要定义一个convert转换消息的对象;
FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
//2.添加fastJson的配置信息,比如:是否要格式化返回的json数据;
FastJsonConfig fastJsonConfig = new FastJsonConfig();
//全局指定了日期格式
fastJsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss");
//指定json返回规则
fastJsonConfig.setSerializeFilters(new FastJsonPropertyValueFilter());
//3处理中文乱码问题
List<MediaType> fastMediaTypes = new ArrayList<>();
fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
//4.在convert中添加配置信息.
fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes);
fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);
//5.将convert添加到converters当中.
converters.add(fastJsonHttpMessageConverter);
}
}