在服务器启动的环境下更新了所有索引，但是搜索的结果没有变，必须要服务器重启才能查出新的结果，我的searcher是系统启动是打开然后就不关闭的，是这个原因吗？请问各位是怎么做的，谢谢！

commit

if not then reopen

高手！能说详细点吗，谢谢了！
是不是reopen Searcher？

你更新进去的信息后，，有没有做commit

如果有，那就reopen index

谢谢，已经解决了，以前没有用过lucene，我的解决方法如下：

boolean neetInit=true;//是否需要初始化search，默认需要
if(search!=null){
  neetInit=false;
  if(!search.getIndexReader().isCurrent()){
	search.close();
	neetInit=true;
   }
}
if(neetInit){
   init();//重新初始化search
}

网上提到一些方法是从原来的search中拿到indexreader,再用reopen新创建一个search,但是我这里会报indexReader已经关闭的错误（原因还不清楚），所以就重新初始化search

问题最终解决了，看了一下API明白了：
先是search.close方法

Note that the underlying IndexReader is not closed, if IndexSearcher was constructed with IndexSearcher(IndexReader r). If the IndexReader was supplied implicitly by specifying a directory, then the IndexReader gets closed

所以我的indexReader会提示已经关闭，因为我已经关闭了searcher。然后是IndexReader的reopen方法：

Refreshes an IndexReader if the index has changed since this instance was (re)opened. 
Opening an IndexReader is an expensive operation. This method can be used to refresh an existing IndexReader to reduce these costs. This method tries to only load segments that have changed or were created after the IndexReader was (re)opened. 

If the index has not changed since this instance was (re)opened, then this call is a NOOP and returns this instance. Otherwise, a new instance is returned. The old instance is not closed and remains usable.
Note: The re-opened reader instance and the old instance might share the same resources. For this reason no index modification operations (e. g. deleteDocument(int), setNorm(int, String, byte)) should be performed using one of the readers until the old reader instance is closed. Otherwise, the behavior of the readers is undefined. 

You can determine whether a reader was actually reopened by comparing the old instance with the instance returned by this method: 

 IndexReader reader = ... 
 ...
 IndexReader new = r.reopen();
 if (new != reader) {
   ...     // reader was reopened
   reader.close(); 
 }
 reader = new;

然后我把自己的代码做了一下修改：

if(search!=null){
   if(!search.getIndexReader().isCurrent()){
     IndexReader ir=search.getIndexReader().reopen();
     search.close();
     search=new IndexSearcher(ir);
   }
}

这样就可以了。Over，下班喽回家睡觉，哈哈