http://*.com/questions/3338999/get-id-of-last-inserted-document-in-a-mongodb-w-java-driver
mongoDB api就可以实现，请仔细查看集合insert方法的源代码

 

 

代码：

BasicDBObject doc = new BasicDBObject( "name", "Matt" );
collection.insert( doc );
ObjectId id = (ObjectId)doc.get( "_id" );

 

代码：

//It's safe to do

doc.set("_id", new ObjectId())
//if you look at driver code

if ( ensureID && id == null ){
    id = ObjectId.get();
    jo.put( "_id" , id );      
}

public static ObjectId get(){
    return new ObjectId();
}

 

 

 

参看文章链接：