java操作mongodb

DB  db=null;
DBCollection coll=null;
 db=mongoTemplate.getDb();
 coll= db.getCollection("test");

//全量查找，显示name,age,隐藏id属性。类似于select name,age from stu.

 DBCursor cur = coll.find(new BasicDBObject(),new BasicDBObject("name",1).append("id", 0).append("age", 1)).limit(500);    
   while (cur.hasNext()) {
                        DBObject object = cur.next();
                          System.out.println(object.get("name"));
                    }
//指定条件查找。
 DBObject dbo = new BasicDBObject();
   dbo.put("id", 110);
DBCursor cur = coll.find(dbo,new BasicDBObject("name",1).append("id", 0).append("age", 1)).limit(500);    
   while (cur.hasNext()) {
                        DBObject object = cur.next();
                        System.out.println(object.get("name"));
                    }
//对查询结果进行字段显示更改。
        while (cur.hasNext()) {
                        DBObject object = cur.next();
　　　　　　　　　　　　　　DBObject newdbo=new BasicDBObject();
　　　　　　　　　　　　　　newdbo.put("姓名"，object.get("name"))
                        System.out.println(newdbo.get("姓名"));
                    }
//去重查询
BasicDBList ages = new BasicDBList(); //字段为集合，要求条件在集合里
//将条件加入集合
ages.add(age);
//设置条件类 age字段集合里 有对应的条件。
tjdbo.put("age", new BasicDBObject("$in",ages));
//name去重显示
List bws=coll.distinct("name",tjdbo);
              for (int i = 0; i < bws.size(); i++) {
                  DBObject dbo=new BasicDBObject();
                   dbo.put("name",bws.get(i)) ;
                    System.out.println(dbo.get("name"));
            } 
//模糊查找
//定义一个匹配规则
Pattern pattern = Pattern.compile("^.*" + key +".*$", Pattern.CASE_INSENSITIVE);
//定义条件类
 DBObject dbo = new BasicDBObject();
dbo.put("name", pattern);
cur = coll.find(dbo,new BasicDBObject("name",1).append("id", 0).append("age", 1));