之前都是直接读取xml文件的,可是这次做东西对方只提供一个URL返回xml,我需要定时读取。
解决方案:
1:通过URL和URLConnection来解析改URL,使其返回inputstream
2:用dom4j解析该inputstream,将解析的数据封装成需要的对象,来存入一个List或Map
3:定义一个Controller来执行该过程
4:用crontab来执行定时任务(linux下,执行crontab -e进行编辑)
@Get("/load")
public String loadDataFromXmlByDate(Invocation inv, @Param("begin") Date datebegin,
@Param("end") Date dateend) {
String begin = DateTimeUtil.getFormatDateTime(datebegin, "yyyyMMdd");
String end = DateTimeUtil.getFormatDateTime(dateend, "yyyyMMdd");
// String ip = inv.getRequest().getRemoteAddr();
String URL = WbConstant.URL + WbConstant.URL_DATE_BEGIN + begin
+ WbConstant.URL_DATE_END + end;
List<Statistic> stats = parseXML(URL);
for (int i = 0; i < stats.size(); i++) {
Statistic st = stats.get(i);
st.setTime(datebegin);
//通过service层来执行逻辑并存储到DB
IResult result = dataService.createStatistic(st);
if (result.isSuccess()) {
if (logger.isInfoEnabled()) {
logger.info("insert data into db from xml success");
}
} else {
if (logger.isInfoEnabled()) {
logger.info(result.getResult("error").toString());
}
}
}
return "ok";
}
/**
* 加载默认日期的xml
* @param inv
* @return
*/
@Get("/loadDefault")
public String defaultLoadDateFromXml(Invocation inv) {
Date today = new Date();
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DATE, -1);
Date yesterday = cal.getTime();
return loadDataFromXmlByDate(inv, yesterday, today);
}
private List<Statistic> parseXML(String URL) {
long beginTime = System.currentTimeMillis();
List<Statistic> xmlList = new ArrayList<Statistic>();
SAXReader reader = new SAXReader();
URL url = null;
try {
url = new URL(URL);
} catch (MalformedURLException e) {
logger.error("给定的URL生成错误", e);
}
try {
URLConnection urlConnection = url.openConnection();
InputStream urlIn = urlConnection.getInputStream();
doc = reader.read(urlIn);
} catch (IOException e) {
logger.error("IOException:通过URL-openConnection-getInputStream时,错误",
e);
} catch (DocumentException e) {
logger.error("DocumentExcepion:SAXReader解析inputsream为Document时,错误",
e);
}
Element root = doc.getRootElement();
for (Iterator<Element> it = root.elementIterator(); it.hasNext();) {
Element e = (Element) it.next();
String date = e.elementText("date");
String pid = e.elementText("pid");
String data = e.elementText("data");
//封装数据为对象
Statistic stat = new Statistic();
stat.setHomeCount(Integer.parseInt(data));
stat.setPid(pid);
stat.setTime(DateTimeUtil.getFormatDate(date));
xmlList.add(stat);
}
long endTime = System.currentTimeMillis();
System.out.println("共花费时间为" + (endTime - beginTime) + "ms");
return xmlList;
}
上面的controller写完了,就可以用crontab来执行定时任务了,该controllerURL为,xxx.com/loadDefault则,定为每天下午2点钟执行一次如下
00 14 * * * wget -a /data/logs/wb/xml.log http://xxx.com/loadDefault
OK了,可以了