java 代码开启事务

@Resource
private DataSourceTransactionManager transactionManager;

　　　　　　　 DefaultTransactionDefinition def = new DefaultTransactionDefinition();
            def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRES_NEW);
            TransactionStatus status = transactionManager.getTransaction(def);
            try {
                List<DistrictAO> districts = districtCustomizedMapper.getCodeAndName(true);
                if (CollectionUtils.isNotEmpty(districts)) {
                    for (DistrictAO district : districts) {
                        if (district.getAdcode().equals(district.getParentAdcode())) {
                            continue;
                        }
                        if (!treeMap.containsKey(district.getParentAdcode())) {
                            treeMap.put(district.getParentAdcode(), new ArrayList<DistrictAO>());
                        }
                        treeMap.get(district.getParentAdcode()).add(district);
                    }
                }
            } catch (Exception e) {
                transactionManager.rollback(status);
                LOG.error(e.getMessage(), e);
            } finally {
                try {
                    transactionManager.commit(status);
                } catch (Exception e) {
                    LOG.error("事务提交异常", e);
                    transactionManager.rollback(status);
                }
            }