java - 判断数据在数据库中是否已存在.

今天下午和同事发生因为判断数据是否在数据库中已存在产生分歧.简易代码如下: {代码...}

From [Javadiscussion group] 2017-04-18 10:54:26 0  6  951

java - 如何修改JSONObject 的值

{ {代码...} }JSONObject 对象rt 想要修改“shops” 对应的值怎么修改？？

From [Javadiscussion group] 2017-04-18 09:12:51 0  4  951

In Gao Qi's Java video code, why does the time print out using a new object created using the Date class, but the hash code address prints out using a self-created object?

Recently, when watching Teacher Gao's video, I found a knowledge point that I didn't quite understand. The cod...

From [Javadiscussion group] 2017-06-23 09:14:34 0  4  950

java - 微信 带参数的临时二维码开发时scene_id不对

在开发带参数的临时二维码是，假如上传到微信的scene_id场景值为123，能正常获取到ticket并生成二维码，但扫完二维码后发现获取的EventKey（即scene_id）为0，但是生成永久二维码时却不会出现这个问题...

From [Javadiscussion group] 2017-04-18 10:48:39 0  0  950

html5-Java using commons-fileupload to upload files has no effect!

. {Code...} Judging from the code, the upload folder should be automatically created for me in web-INF. The pa...

From [Javadiscussion group] 2017-06-14 10:51:29 0  2  949

javascript - Urgent, my host IP is bound to someone else's domain name, how to solve it? ?

My host IP is bound by someone else's IP. How to solve it? ? What should you do?

From [Javadiscussion group] 2017-06-12 09:24:58 0  3  949

java - 随机不重复昵称怎么生成?

随机不重复昵称怎么生成?

From [Javadiscussion group] 2017-04-17 17:46:14 0  5  949

About serialization and deserialization in Java

1. The following code serializes file 2.log and saves it to 2.txt {code...} Deserialization: use ObjectInputSt...

From [Javadiscussion group] 2017-05-27 17:41:47 0  1  948

java - 控制并发线程数

{代码...} 忘了，大概是这样；要求并发调用call2的线程数小于maxCounter(也即3),请问如何添加代码（在call1中）？

From [Javadiscussion group] 2017-04-18 10:46:36 0  2  948

java - 有一个算法问题想请教，给定一亿个数，如何用最快的方法取出其中最大的三个数。

最近有一个java大神，是蚂蚁支付宝的哦，问了我这么一个问题。我的回答是先将数组分解成两百个小数组或者更多，在开两百个thread进行排序，取最大，然后对这两百个数进行排序，取前三。其实我的思路根本就没有涉...

From [Javadiscussion group] 2017-04-18 09:13:57 0  8  948

javascript - textStatus error in ajax is reported as parsererror?

The textStatus error in ajax is parsererror. {Code...} Please give me some advice. I have never encountered th...

From [Javadiscussion group] 2017-06-23 09:12:53 0  4  947

How constants are defined in java.

{Code...} What are the characteristics of these two ways of defining constants? Which method is more recommend...

From [Javadiscussion group] 2017-06-12 09:19:32 0  2  947

javascript - 400 bad request appears in Ajax request background

Problem solved: I found that the select data is a string array by default, so when passing parameters in ajax,...

From [Javadiscussion group] 2017-05-17 10:09:27 0  2  947

java-web - JAVA语言如何实现ES6 Object.assign，两个属性相同的对象增量更新字段信息，最好最快的实现方式？

对象比较复杂，对象拥有其他对象，最好的实现方式是什么

From [Javadiscussion group] 2017-04-18 10:53:06 0  1  947

java - springmvc mvc:exclude-mapping 不起作用

在springmvc配置文件中加入下面的代码，路由为"/login"的url还是会被拦截到拦截器中 {代码...} 拦截器LoginInterceptor {代码...}

From [Javadiscussion group] 2017-04-18 10:23:23 0  3  947