import com.couchbase.client.java.repository.annotation.Id; //导入依赖的package包/类
@Override
public Field load(final Class key) throws Exception {
  if (key == Object.class) {
    throw new IllegalArgumentException("Entity class: " + key.getName()
        + " must have an 'id' field or a field annotated with @" + Id.class.getName());
  }
  Field[] fields = key.getDeclaredFields();
  for (Field field : fields) {
    if (field.getName().equals("id")) {
      field.setAccessible(true);
      return field;
    } else if (field.getAnnotation(Id.class) != null) {
      field.setAccessible(true);
      return field;
    }
  }
  return load(key.getSuperclass());
}
 

import com.couchbase.client.java.repository.annotation.Id; //导入依赖的package包/类
@Test
public void getId() {
  new IdGenerator();

  assertEquals("id1", IdGenerator.getId(new Object() {
    private String id = "id1";

    @Override
    public String toString() {
      return id;
    }
  }));

  assertEquals(1L, IdGenerator.getId(new Object() {
    @Id
    private Long beerId = 1L;
  }));
}
 

import com.couchbase.client.java.repository.annotation.Id; //导入依赖的package包/类
@Test
public void getIdName() {
  assertEquals("id", IdGenerator.getIdName(new Object() {
    private String id = "id1";

    @Override
    public String toString() {
      return id;
    }
  }));

  assertEquals("beerId", IdGenerator.getIdName(new Object() {
    @Id
    private Long beerId = 1L;
  }));
}
 

import com.couchbase.client.java.repository.annotation.Id; //导入依赖的package包/类
default void setId(T obj, HashMap hashMap, Class<T> clazz) {
    Arrays.stream(clazz.getDeclaredFields()).forEach(field -> {
        if(field.getAnnotation(Id.class) != null) {
            try {
                field.setAccessible(true);
                field.set(obj, hashMap.get("id"));
            } catch(IllegalAccessException e) {
                throw new RuntimeException(e);
            }
        }
    });
}