利用Gson将对象转换成json,忽略某些字段的方法

 public @interface FooAnnotation {
   // some implementation here
 }

 // Excludes any field (or class) that is tagged with an "@FooAnnotation"
 private static class FooAnnotationExclusionStrategy implements ExclusionStrategy {
   public boolean shouldSkipClass(Class<?> clazz) {
     return clazz.getAnnotation(FooAnnotation.class) != null;
   }

   public boolean shouldSkipField(FieldAttributes f) {
     return f.getAnnotation(FooAnnotation.class) != null;
   }
 }