Collectors.groupingBy应用

@Override
public Map<String, Map<String, List<ServiceGitEntity>>> uiCasePolicyDropList(long jiraBrand) {
    Example example = new Example(ServiceEntity.class);
    Example.Criteria criteria = example.createCriteria();
    criteria.andEqualTo("jiraBrand", jiraBrand);
    List<ServiceEntity> serviceEntities = serviceMapper.selectByExample(example);
    List<GitEntity> gitEntities = gitMapper.getByType(GitType.UT.getCode());
    List<ServiceGitEntity> serviceGitEntities = new ArrayList<>();
    ServiceGitEntity serviceGit = null;
    for (ServiceEntity serviceEntity : serviceEntities) {
        for (GitEntity gitEntity : gitEntities) {
            if (serviceEntity.getId().equals(gitEntity.getServiceId())) {
                serviceGit = new ServiceGitEntity();
                serviceGit.setProject(serviceEntity.getProject());
                serviceGit.setBranch(gitEntity.getBranch());
                serviceGit.setName(serviceEntity.getName());
                serviceGit.setId(serviceEntity.getId());
                serviceGit.setUrl(gitEntity.getUrl());
                if (!serviceGitEntities.contains(serviceGit)) {
                    serviceGitEntities.add(serviceGit);
                }
            }
        }
    }
    Map<String, Map<String, List<ServiceGitEntity>>> map = serviceGitEntities.stream().collect(Collectors.groupingBy(ServiceGitEntity::getProject,Collectors.groupingBy(ServiceGitEntity::getName)));
    return map;
}