java 实现数据列表导出 excel

/** 导出 */
public String exp() {
	TsimpSysLogQuery query = newQuery(TsimpSysLogQuery.class, DEFAULT_SORT_COLUMNS);
	Page page = tsimpSysLogManager.findPage(query);
	List list = page.getResult();

	if (list.size() > 0) {
		List list2 = new ArrayList();
		HashMap map = new LinkedHashMap();
		map.put("key_1", TsimpSysLog.ALIAS_ACCOUNT_ID);
		map.put("key_2", TsimpSysLog.ALIAS_OPERATE_IP);
		map.put("key_3", TsimpSysLog.ALIAS_GRADE);
		map.put("key_4", TsimpSysLog.ALIAS_OBJECT);
		map.put("key_5", TsimpSysLog.ALIAS_OPERATE_TIME);
		map.put("key_6", TsimpSysLog.ALIAS_TYPE);
		list2.add(map);
		for (int i = 0; i < list.size(); i++) {
			HashMap map1 = new LinkedHashMap();
			TsimpSysLog bean = (TsimpSysLog) list.get(i);
			map1.put("key_1", bean.getAccountId());
			map1.put("key_2", bean.getOperateIp());
			map1.put("key_3", bean.getGrade());
			map1.put("key_4", bean.getObject());
			map1.put("key_5", bean.getOperateTimeString());
			map1.put("key_6", bean.getType());
			list2.add(map1);
		}
		ExportExl exl = new ExportExl();
		exl.download(ServletActionContext.getRequest(), ServletActionContext.getResponse(), "SysAccount", list2, 6);
	}
	return null;
}