java查询mongo数据库10万次运行时间

java测试程序运行时间，主要通过两个System.currentTimeMillis()之差获得：

// 设置时间点time1

long time1 = System.currentTimeMillis();





// 设置时间点time2

long time2 = System.currentTimeMillis();


// 计算运行时间值

long period = time2 - time1;

返回单位为毫秒mm的long型时间差

MongoDB db = new MongoDB();
long time1 = System.currentTimeMillis();
for(int i=0;i<100000;i++){
   Bsondocument user = db.findOne(eq("Status",1),"User");
    System.out.println(user);
    System.out.println("one-"+i);
}
long time2 = System.currentTimeMillis();
long period = time2 - time1;
System.out.println("period="+(period/1000));

CodecRegistry pojoCodecRegistry = fromRegistries(MongoClientSettings.getDefaultCodecRegistry(), fromProviders(PojoCodecProvider.builder().automatic(true).build()));
time1 = System.currentTimeMillis();
for(int i=0;i<100000;i++){
    try (MongoClient mongoClient = MongoClients.create(uri)) {
        MongoDatabase database = mongoClient.getDatabase("XXXX").withCodecRegistry(pojoCodecRegistry);
        MongoCollection cUser = database.getCollection("User", User.class);
        User doc1 = cUser.find(eq("Status", 1)).first();
        //System.out.println(doc1);
    }
    System.out.println("two-"+i);
}
time2 = System.currentTimeMillis();
period = time2 - time1;
System.out.println("period="+(period/1000));

使用mongotemplate访问mongo，运行10万次，花费时间213秒（连接变量用static）。

每次都new一个连接的情况，查询10万次，花费时间719秒，并且过程中很容易遇到连接被关闭的情况，mongodb的连接自带连接池功能