elasticsearch开启加载外部词典功功能后，会每60s间隔进行刷新字典。
public void loadDic(HttpServletRequest req,HttpServletResponse response){
String eTag =req.getParameter("If-None-Match");
try {
OutputStream out= response.getOutputStream();
List<String> list=new ArrayList<String>();
list.add("我中国");
list.add("我爱你爱我");
String oldEtag = list.size() + "";
StringBuffer sb=new StringBuffer();
if (oldEtag != eTag) {
for (String str : list) {
if(StringUtils.isNotBlank(str)){
sb.append("\r\n");
}
sb.append(str+"\r\n");
}
}
String data=sb.toString();
response.setHeader("Last-Modified", String.valueOf(list.size()));
response.setHeader("ETag",String.valueOf(list.size()));
response.setContentType("text/plain; charset=gbk");
out.write(data.getBytes());
out.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}