package com.dobbinsoft.fw.core.util;
public interface ISessionUtil<U extends IdentityOwner, A extends PermissionOwner> {

    public void setUser(U userDTO);

    public U getUser();

    public void setAdmin(A adminDTO);

    public A getAdmin();

    public Class<U> getUserClass();

    public Class<A> getAdminClass();

    public boolean hasPerm(String permission) throws ServiceException;

}

public class VipOrderServiceImpl extends BaseService<UserDTO, AuthAdminDTO> implements VipOrderService {
	public Object prepay(Long templateId, String ip, Long userId) throws ServiceException {
    	...
        orderRequest.setOpenid(sessionUtil.getUser().getWxMpOpenId());
        ...
    }
}

@Autowired
private ISessionUtil sessionUtil;

@Component
@Primary
public class MySessionUtil<U extends IdentityOwner, A extends PermissionOwner> implements ISessionUtil<U, A> {
	.... impl
}