aizenright001的博客

方法1：String utc = "2019-07-10T16:00:00.000Z";Date date = null;SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");date = sdf.parse(utc);System.out.println("UTC时间: " + date);Cale...

服务启动异常,端口被占用Connected to the target VM, address: '127.0.0.1:64717', transport: 'socket'org.apache.catalina.LifecycleException: Failed to start component [Connector[HTTP/1.1-8087]]Caused by: java.ne...

/** * 生成指定长度的随机字符串 * * @param length * @return */public static String getRandomStringByLength(int length){ StringBuilder sb = new StringBuilder() ; for (int j = 0; j < length; j++) {...

相对路径//获取src资源文件编译后的路径（即classes路径classes目录）String path1 = this.getClass().getClassLoader().getResource("").getPath();//获取src资源文件编译后的路径（即classes路径下当前文件目录）String path2 = this.getClass().getResource(...

1.example(从程序写到本地)String tempPath = "F:\\temp\\test\\test.txt";//生成文件try { File files = new File(tempPath); if(!files.exists()){ files.createNewFile(); } String content = "...

一.map的使用1.遍历map中的键Map<Integer, Integer> map = new HashMap<>();for (Integer key : map.keySet()) { System.out.println("Key = " + key);}2.遍历map中的值for (Integer value : map.values())...

/** * 是否连续签到(true连续、false未连续)，今天和昨天比较 判断yesterday 是否是昨天的时间，true表示是昨天 * * @param uid * @return */public boolean ifSignedContinuous(Long uid){ boolean flag = false; try{ User use...

sql用法修改表中某个字段类型alter table s_person modify column id bigint(20) not null; 修改表中某个字段长度(注：主键ID不能修改)alter table S_ATTACHMENT alter column FILE_NAME varchar(800); 修改字段的值(替换原值、在原值前或后拼接)updat...