功能要求根据数据库记录的key-value-remark 数据，导出保存properties文件

1. pro.load()  pro.list() 处理不能解决备注、排序问题

2. 最后考虑下什么是properties文件，操作系统大概怎么区分这样的数据是正确的properties数据，区分大概回车符与#符，直接拼接字符，输入输出流导出

@RequestMapping(value = "/export/{id}", method = RequestMethod.GET)
public void export(@PathVariable("id") Long id) throws IOException {
response.reset();
StringBuilder buff = new StringBuilder();

    AppProperties tc = appPropertiesService.get(id);  
    String fileName = tc.getLineCode()+tc.getAppCode()+tc.getId();  
    if(tc != null){  
        Collection<SearchFilter> filters = new ArrayList<>();  
        filters.add(new SearchFilter("refId",SearchFilter.Operator.valueOf("EQ"),id));  
        List<PropertiesInfo> detailList = propertiesInfoService.findAll(new SearchSpecification(filters,PropertiesInfo.class) , new Sort(Sort.Direction.ASC,new String\[\]{"orderBy"}));  
        for(PropertiesInfo info:detailList){  
            if(info.getRemark() != null && !"".equals(info.getRemark())){  
                buff.append("#").append(info.getRemark()).append("\\r");  
            }  
            buff.append(info.getKey()).append("=").append(info.getValue()).append("\\r");

        }  
    } 

    response.setHeader("Content-Disposition", "attachment;filename="+fileName+".properties");  
    response.setContentType("application/msexcel; charset=GBK");  
    ServletOutputStream out = response.getOutputStream();

    BufferedInputStream br = new BufferedInputStream(new ByteArrayInputStream(buff.toString().getBytes()));  
    byte\[\] buf = new byte\[\];  
    int len = ;   

    while ((len = br.read(buf)) > ){  
        out.write(buf, , len);  
    }  
    out.flush();  
    br.close();  
    out.close();

}