Oracle 权限、视图、约束 Oracle 权限、视图、约束一、数据库权限1、查看用户所属角色select * from user_role_privs;2、查询角色权限CONNECT：仅连接权限select * from dba_sys_privs where grantee='CONNECT'查看RESOURCE权限：select * from dba_sys_privs where grantee='RESOURCE'DBA角色权限查看select * from dba_sys_privs where grantee='DBA'3、用户授权例如：授予scoot拥有dba的权限grant dba to scott;二、视图1、创建视图Create view 视图名称as 查询语句 create view v_emp1 as select ename,job from emp;2、修改视图create or replace view 始图名称 as 新的查询数据； create or replace view vemp as select empno,ename,job from EMP t;注意与创建视图的不同：多了一个or replace3、删除视图drop view 视图名称； drop view vemp2;4、使用视图select * from 视图； select * from vemp;就当作是一张虚拟的表使用。5、修改视图数据注意：修改视图数据，实际是修改实际表的数据，不是视图的数据。例如修改上面视图数据：update vemp set ename='xxxx' where job='CLERK' and empno='7369'修改后：最后实际修改的是，视图中查询数据表的实际数据。上面视图实际修改的是EMP表的数据：select * from EMP;注意：修改视图数据时，实际是修改实际表的数据，不是视图的数据。6、视图添加数据注意：向视图数据添加数据，实际是向实际表中添加数据和普通表添加数据一样，视图只是在向实际的表添加数据 insert into vemp values('1111','bbbbb','teacher');查看添加视图数据，实际是向实际表中添加了数据。select * from vemp;查看实际表中数据：select * from EMP;7、删除视图中数据和普通删除表数据一样，实际是删除的实际表中数据。delete from vemp where empno=1111总结：对视图中数据的CRUD实际是对真实表的数据操作，实际开发中一般都会将视图设置为只读，防止误操作。8、只读视图Create view 视图名称as 查询语句 with read only;当向视图添加、删除、修改数据时，都会提示“无法对只读视图执行dml操作”。三、约束1、主键约束（Primary）用来标识唯一一条记录的。非空，和其它表的外键有关系，其它表的外键关联该表的主键，起到约束作用。一般用作条件查询、条件修改、条件删除等操作。id设置为主键。查询一条数据：insert into t_bookType values(1,'java history');查看数据：select * from t_bookType;查看建外键sql语句：查看sql：这里就能看到建表、建主键的sql语句了：2、外键约束(Foreign)起到约束作用。新建表：创建外键：注意：另一张表t_bookType的主键id不能为空，否则建外键时会报错id不能为空。查看建外键sql语句和上面一样：约束作用：查看t_bookType数据：向t_book添加数据时：添加一条不存在的主键数据时，就会提示“违反完整约束条件”因此起到了，约束添加的外键只能是另一张表里面存在的主键。3、唯一性约束(Unique)约束某些字段值作为唯一标识，不能重复添加相同数据。添加方式查看sql脚本同上：没加约束前，可以添加相同bookTypeName的记录，加了约束后会提示报错"违反唯一约束条件"4、检查约束（针对所有记录，上面1、2、3都是正对一条记录）给某个字段添加，写入值的条件。t_book增加价格price字段：查询t_book:如果以后向每次添加数据时，检查price价格返回是否在50-100之间，就可以使用检查约束。添加检查约束sql：添加数据价格在范围内不报错，超出范围会提示报错“范围检查约束条件”5、默认值约束其实就是添加数据时，某些字段没有设置时，给字段设置默认值。t_book增加作者性别字段：添加一条数据：insert into T_BOOK(id,BOOKNAME,TYPE_ID,price) values(3,'jvm并发',1,66);新加数据sex性别为空，不符合实际逻辑，怎么会没有性别，因此想设置默认值。添加默认值约束：重新添加一条数据：此时就有默认值了。删除上面添加没有sex性别的记录，重新加添；insert into T_BOOK(id,BOOKNAME,TYPE_ID,price) values(3,'jvm并发',1,66);现在就有值了。添加默认值约束SQL：6、非空约束设置字段值不能为空勾选：允许为空，不勾选：不允许为空。查询一条件数据，价格不添加：添加数据值，为添加price的值，由于设置了非空约束，不能为空，所以报错“无法将null插入”

Docker安装ShowDoc ssl https nginx配置 Docker安装ShowDoc ssl https nginx配置一、docker安装showdoc1、拉取镜像# 中国大陆镜像安装命令（安装后记得执行docker tag命令以进行重命名）docker pull registry.cn-shenzhen.aliyuncs.com/star7th/showdoc docker tag registry.cn-shenzhen.aliyuncs.com/star7th/showdoc:latest star7th/showdoc:latest 2、创建showdoc数据目录mkdir -p /mydata/showdoc/showdoc_data/html chmod -R 777 /mydata/showdoc/showdoc_data3、启动容器docker run -d --name showdoc --user=root --privileged=true -p 4999:80 \ -v /mydata/showdoc/html:/var/www/html/ star7th/showdoc4、设置随容器启动docker update --restart=always showdoc此时旧可以通过IP+port访问了，注意，端口放行，云服务器白名单开启。二、showdoc配置https、ssl、nginx配置nginx https、ssl配置如下：server { listen 443 ssl; server_name doc.yanxizhu.com; client_max_body_size 1000m; ssl on; ssl_certificate /etc/nginx/conf.d/key/doc.yanxizhu.com_bundle.crt; ssl_certificate_key /etc/nginx/conf.d/key/doc.yanxizhu.com.key; ssl_session_cache shared:SSL:1m; ssl_session_timeout 10m; ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:!NULL:!aNULL:!MD5:!ADH:!RC4; ssl_protocols TLSv1 TLSv1.1 TLSv1.2; ssl_prefer_server_ciphers on; location ^~ / { proxy_pass http://自己云服务器ip:4999/; proxy_redirect off; proxy_connect_timeout 90; proxy_send_timeout 90; proxy_read_timeout 90; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header http_user_agent $http_user_agent; } } server { listen 80; server_name doc.yanxizhu.com; rewrite ^(.*) https://doc.yanxizhu.com$1 permanent; }注意：修改自己域名和对应端口。此时就可以通过域名https://doc.yanxizhu.com/访问了。

Oracle常用函数 一、Oracle 表空间一个数据库可以有多个表空间，一个表空间里可以有多个表。表空间就是存多个表的物理空间；可以指定表空间的大小位置等。创建表空间create tablespace ts1 datafile 'C:\tablespace\ts1.dbf' size 50M;自动扩展大小create tablespace ts2 datafile 'C:\tablespace\ts2.dbf' size 50M autoextend on next 10M;设置最大空间create tablespace ts3 datafile 'C:\tablespace\ts3.dbf' size 50M autoextend on next 10M maxsize 1024M;更改用户默认表空间alter database default tablespace ts1;表空间改名alter tablespace ts1 rename to tss1;删除表空间drop tablespace ts2 including contents and datafiles;二：虚拟表dual 表Dual 表是sys 用户下的一张虚表；提供一些运算和日期操作时候用到；例如，查询系统日期时间select sysdate from dual;三、序列序列作为数据库里的对象，主要作用是生成唯一的主键值；创建序列create sequence 序列名称； 重要属性： 序列名称.currval 当前值nextval 下一个值 指定初始值： start with xx序列属性Minvalue maxvalue 最大值和最小值默认最小值1 最大值10 的27 次方； Increment by 属性序列增长步长默认值1 Cycle 设置循环； （了解即可，不使用）； Cache 缓存设置； 一次获取序列的多个连续值，默认20 ，放到内存中，方便下次快速获取；四、CRUD插入insert 语句给指定列插入数据：insert into dept(deptno,dname) values(50,'xx'); 插入全部列数据：insert into dept(deptno,dname,loc) values(60,'xx','lll'); 简写insert into dept values(70,'xxx','llll');更新update 语句更新指定数据：update dept set dname='司法部' where deptno=50; update dept set dname='司法部' ,loc='china' where deptno=50;删除delete 语句删除指定数据：delete from dept where deptno=70; 删除指定条件的数据：delete from dept where deptno>40;查询select 语句查询所有：select * from emp; 指定字段查询：select ename,sal from emp; 加where 条件：select * from emp where sal>=800; select * from emp where sal>=1500 and job='SALESMAN'; Distinct 去重复记录； Group by 分组查询：select job,count(ename) as num from EMP t group by job; Having 过滤分组：select job,count(ename) as num from EMP t group by job having count(ename)>=2; Order by 排序：select * from emp order by sal desc; 子查询：查询出基本工资大于平均工资的员工：select * from emp where sal>(select avg(sal) from emp) 联合查询： 并集（去重复）： select * from t_user1 union select * from t_user2; 并集： select * from t_user1 union all select * from t_user2; 交集： select * from t_user1 intersect select * from t_user2; 差集： select * from t_user1 minus select * from t_user2; 内连接： select * from emp t,dept d where t.deptno=d.deptno; 类似：select * from emp e inner join dept d on e.deptno=d.deptno; inner 可以省略； 外连接： 左外连接：select * from emp e left join dept d on e.deptno=d.deptno; 右外连接：select * from emp e right join dept d on e.deptno=d.deptno;五、数据类型1、字符串类型及函数字符类型分3 种，char(n) 、varchar(n)、varchar2(n) ；char(n)：固定长度字符串，假如长度不足n，右边空格补齐；varchar(n)：可变长度字符串，假如长度不足n，右边不会补齐；varchar2(n)：可变长度字符串，Oracle 官方推荐使用，向后兼容性好；char(n) VS varchar2(n)： char(n)查询效率相对较高，varchar2(n)存储空间相对较小；字符串常用方法lpad() 向左补全字符串：select lpad(stuno,6,'0') from t_user3; rpad() 向右补全字符串：select rpad(stuno,6,'0') from t_user3; lower() 返回字符串小写：select lower(userName) from t_user3; upper() 返回字符串大写：select upper(userName) from t_user3; initcap() 单词首字符大写：select initcap(userName) from t_user3; length() 返回字符串长度：select length(password) from t_user3; substr() 截取字符串：select substr(userName,1,2) from t_user3; instr() 获取字符串出现的位置：select instr(password,'23',2,2) from t_user3; ltrim() 删除左侧空格:select ltrim(userName) from t_user3; rtrim() 删除右侧空格:select rtrim(userName) from t_user3; trim() 删除两侧空格:select trim(userName) from t_user3; concat() 串联字符串：select concat(userName,password) from t_user3; reverse() 反转字符串：select reverse(userName) from t_user3;2、数值类型number：是oracle 中的数据类型；number(precision,scale)；Precision，scale 均可选；Precision 代表精度，sacle 代表小数位的位数；Precision 范围[1,38] scale 范围[-84,127]举例： 12345.678 Precision 是8 scale 是3；数值类型常用方法abs() 求绝对值；select abs(n1) from t_number where id=1; round() 四舍五入：select round(n1,2) from t_number where id=1; ceil() 向上取整：select ceil(n1) from t_number where id=2; floor 向下取整：select floor(n1) from t_number where id=2; Mod()取模：select mod(5,3) from dual; Sign()正负性：select sign(n1) from t_number where id=1; Sqrt() 求平方根：select sqrt(9) from dual; Power()求乘方：select power(2,3) from dual; Trunc()截取：select trunc(123.456,2) from dual; To_char() 格式化数值：常见的字符匹配有0、9、，、$、FM、L、CTo_char() 格式化数值To_char() 格式化数值：常见的字符匹配有0、9、，、$、FM、L、C select to_char(123.45,'0000.000') from dual; select to_char(123.45,'9999.999') from dual; select to_char(123123,'99,999,999.99') from dual; select to_char(123123.3,'FM99,999,999.99') from dual; select to_char(123123.3,'$99,999,999.99') from dual; select to_char(123123.3,'L99,999,999.99') from dual; select to_char(123123.3,'99,999,999.99C') from dual;3、日期类型Date 和timestamp（时间戳）Date ：包含信息century（世纪信息） year 年month 月day 日hour 小时minute 分钟second 秒Timestamp ：一般用于日期时间要求非常精确的情况，精确到毫秒级；insert into t_date values(1,sysdate,systimestamp);日期类型常用方法select sysdate from dual; select systimestamp from dual; Add_months 添加月份select add_months(d1,2) from t_date where id=1; Last_day 返回指定日期月份的最后一天select last_day(d1) from t_date where id=1; update t_date set d3=to_date('2016-12-20','YYYY-MM-DD') where id=1; update t_date set d3=to_date('2016-12-20 18:31:34','YYYY-MM-DD HH24:MI:SS') where id=1; Months_between 返回两个日期的相差月数select months_between(d1,d3) from t_date where id=1; next_day 返回特定日期之后的一周内的日期：select next_day(d1,2) from t_date where id=1;Trunc 截取日期select trunc(d1,'YYYY') from t_date where id=1; select trunc(d1,'MM') from t_date where id=1; select trunc(d1,'DD') from t_date where id=1; select trunc(d1,'HH') from t_date where id=1; select trunc(d1,'MI') from t_date where id=1;Extract 返回日期的某个域select extract(year from sysdate) from dual; select extract(month from sysdate) from dual; select extract(day from sysdate) from dual; select extract(Hour from systimestamp) from dual; select extract(minute from systimestamp) from dual; select extract(second from systimestamp) from dual;To_char 将日期转换成字符串select to_char(d1,'YYYY-MM-DD') from t_date where id=1; select to_char(d1,'YYYY-MM-DD HH24:MI:SS') from t_date where id=1;4、其他常用处理函数常用的聚合函数Max 求最大值：select max(sal) from emp ; Min 求最小值：select min(sal) from emp ; Avg 求平均值：select avg(sal) from emp ; Sum 求和：select sum(sal) from emp ; Count 统计记录数：select count(ename) from emp ;Nvl 空值处理select ename,nvl(sal,0) from emp;rownum 分页select * from (select a.*,rownum rn from (select * from emp) A where rownum<=10) where rn>5;Oracle 中的运算select 2+1 from dual; select 2-1 from dual; select 2*1 from dual; select 2/1 from dual;条件判断式Between and 范围查询： select * from emp where sal between 900 and 1500; select * from emp where sal>=900 and sal<=1500;In 集合范围select ename,hiredate from emp where ename in (select distinct ename from bonus)Like 模糊查询select * from emp where ename like '%M%' select * from emp where ename like 'M%' select * from emp where ename like '_M%'

JAVA8-Date and Time API： LocalDate, LocalTime, Instant, Duration, Period JAVA8-Date and Time API： LocalDate, LocalTime, Instant, Duration, Period旧API问题1、代码不清晰，一下看不出要转换的日期。2、Date日期中还包含了时间 3、多线程情况下会报错。代码重现：package com.example.study.java8.datetime; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; public class DateTest { public static void main(String[] args) throws ParseException { //122格林威治时间 11月 23日期 //问题：不能清晰表示日期 Date date = new Date(122, 11, 23); System.out.println(date); //多线程情况下会出现一些问题： //30个线程，每个线程下循环100次，执行时间格式转换。 SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd"); for (int i = 0; i < 30; i++) { new Thread(() -> { for (int j = 0; j < 100; j++) { Date parseDate = null; try { parseDate = sdf.parse("20221123"); } catch (ParseException e) { e.printStackTrace(); } System.out.println(parseDate); } }).start(); } } }输出结果：Fri Dec 23 00:00:00 CST 2022 .。。。。。。。。。。 java.lang.NumberFormatException: For input string: "" at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) at java.base/java.lang.Long.parseLong(Long.java:702) at java.base/java.lang.Long.parseLong(Long.java:817) at java.base/java.text.DigitList.getLong(DigitList.java:195) at java.base/java.text.DecimalFormat.parse(DecimalFormat.java:2121) at java.base/java.text.SimpleDateFormat.subParse(SimpleDateFormat.java:1931) at java.base/java.text.SimpleDateFormat.parse(SimpleDateFormat.java:1541) at java.base/java.text.DateFormat.parse(DateFormat.java:393) at com.example.study.java8.datetime.DateTest.lambda$main$0(DateTest.java:22) at java.base/java.lang.Thread.run(Thread.java:834) Exception in thread "Thread-25" Exception in thread "Thread-14" java.lang.NumberFormatException: multiple points at java.base/jdk.internal.math.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1914) at java.base/jdk.internal.math.FloatingDecimal.parseDouble(FloatingDecimal.java:110)新API学习1、LocalDate 线程安全package com.example.study.java8.datetime; import java.text.ParseException; import java.text.SimpleDateFormat; import java.time.LocalDate; import java.time.temporal.ChronoField; import java.util.Date; /** * java8 Date and Time API：LocalDate 线程安全 */ public class DateTestApi { public static void main(String[] args) { testLocalDate(); } private static void testLocalDate() { //1、LocalDate LocalDate localDate = LocalDate.of(2022, 11, 23); System.out.println(localDate); //获取年 System.out.println(localDate.getYear()); //获取月 System.out.println(localDate.getMonth()); //今年的第几天 System.out.println(localDate.getDayOfYear()); //这个月的第几天 System.out.println(localDate.getDayOfMonth()); //这一周的星期几 System.out.println(localDate.getDayOfWeek()); //整数：这个月的第几天 //其它枚举值用法一样 int dayOfMoth = localDate.get(ChronoField.DAY_OF_MONTH); System.out.println(dayOfMoth); //获取当前时间 LocalDate nowLocalDate = LocalDate.now(); System.out.println(nowLocalDate); } }输出结果：2022-11-23 2022 NOVEMBER 327 23 WEDNESDAY 23 2022-11-232、LocalTimepackage com.example.study.java8.datetime; import java.text.ParseException; import java.text.SimpleDateFormat; import java.time.LocalDate; import java.time.LocalTime; import java.time.temporal.ChronoField; import java.util.Date; /** * java8 Date and Time API：LocalDate 线程安全 */ public class DateTestApi { public static void main(String[] args) { testLocalTime(); } private static void testLocalTime(){ //获取当前时间 LocalTime time = LocalTime.now(); System.out.println(time); //时 System.out.println(time.getHour()); //分 System.out.println(time.getMinute()); //秒 System.out.println(time.getSecond()); } }输出结果：21:19:22.856586500 21 19 223、LocalDateTime，提供的api更丰富，线程更安全package com.example.study.java8.datetime; import java.text.ParseException; import java.text.SimpleDateFormat; import java.time.LocalDate; import java.time.LocalDateTime; import java.time.LocalTime; import java.time.temporal.ChronoField; import java.util.Date; /** * java8 Date and Time API：LocalDate 线程安全 */ public class DateTestApi { public static void main(String[] args) { combineLocalDateAndTime(); } // API-2: LocalDateTime 日期时间 private static void combineLocalDateAndTime() { // 整合LocalDate和LocalTIme LocalDate date = LocalDate.now(); LocalTime time = LocalTime.now(); LocalDateTime dateTime = LocalDateTime.of(date, time); System.out.println(dateTime); //直接获取当前日期时间 LocalDateTime now = LocalDateTime.now(); System.out.println(now); //获取日期时间，是一周中的周几，其它api方法用法一样 System.out.println(now.getDayOfWeek()); } }输出结果：2022-11-23T21:28:37.228619600 2022-11-23T21:28:37.229621100 WEDNESDAY4、Instant 点，时刻，时间点package com.example.study.java8.datetime; import java.text.ParseException; import java.text.SimpleDateFormat; import java.time.*; import java.time.temporal.ChronoField; import java.util.Date; /** * java8 Date and Time API：LocalDate 线程安全 */ public class DateTestApi { public static void main(String[] args) throws InterruptedException { testInstant(); } //API-4 Instant 时间点，时刻，点 private static void testInstant() throws InterruptedException { Instant start = Instant.now(); Thread.sleep(1000L); Instant end = Instant.now(); //Duration 时间段 Duration duration = Duration.between(start, end); System.out.println(duration.toMillis()); } }输出结果：10095、Duration 时间段package com.example.study.java8.datetime; import java.text.ParseException; import java.text.SimpleDateFormat; import java.time.*; import java.time.temporal.ChronoField; import java.util.Date; /** * java8 Date and Time API：LocalDate 线程安全 */ public class DateTestApi { public static void main(String[] args) throws InterruptedException { testDuration(); } //API-5 Duration 时间段 private static void testDuration() { LocalTime start = LocalTime.now(); //减1小时 LocalTime end = start.minusHours(1); //开始到结束 Duration durationBetween = Duration.between(end, start); //用了多少小时 System.out.println(durationBetween.toHours()); } } 输出结果：16、Period 周期、时期、时代package com.example.study.java8.datetime; import java.text.ParseException; import java.text.SimpleDateFormat; import java.time.*; import java.time.temporal.ChronoField; import java.util.Date; /** * java8 Date and Time API：LocalDate 线程安全 */ public class DateTestApi { public static void main(String[] args) throws InterruptedException { testPeriod(); } //API-6 Period private static void testPeriod() { Period period = Period.between(LocalDate.of(2000, 10, 9), LocalDate.of(2022, 12, 13)); System.out.println(period.getYears()); System.out.println(period.getMonths()); System.out.println(period.getDays()); } } 输出结果：22 2 47、format 日期时间格式化成字符串package com.example.study.java8.datetime; import java.text.Format; import java.text.ParseException; import java.text.SimpleDateFormat; import java.time.*; import java.time.format.DateTimeFormatter; import java.time.temporal.ChronoField; import java.util.Date; /** * java8 Date and Time API：LocalDate 线程安全 */ public class DateTestApi { public static void main(String[] args) throws InterruptedException { testLocalDateFormat(); } //API-7 format 日期时间格式化成字符串 private static void testLocalDateFormat() { //日期格式化 LocalDate date = LocalDate.now(); String basicDate = date.format(DateTimeFormatter.BASIC_ISO_DATE); //日期时间格式化 LocalDateTime now = LocalDateTime.now(); String time = now.format(DateTimeFormatter.ISO_LOCAL_TIME); System.out.println(basicDate); System.out.println(time); //自定义格式化格式 LocalDateTime localDateTime = LocalDateTime.now(); //自定义格式 DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"); String formatDateTIme = localDateTime.format(formatter); System.out.println(formatDateTIme); } } 输出结果：20221124 20:28:09.71863167、parse 字符串格式化成日期时间package com.example.study.java8.datetime; import java.text.Format; import java.text.ParseException; import java.text.SimpleDateFormat; import java.time.*; import java.time.format.DateTimeFormatter; import java.time.temporal.ChronoField; import java.util.Date; /** * java8 Date and Time API：LocalDate 线程安全 */ public class DateTestApi { public static void main(String[] args) throws InterruptedException { testLocalDateParse(); } //API-7 parse 字符串转日期时间格式 private static void testLocalDateParse() { //字符串日期转date类型，注意字符串格式和要转换的格式要一样 String date = "2022-11-24"; DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd"); LocalDate localDate = LocalDate.parse(date, formatter); System.out.println(localDate); //字符串时间转time类型，注意字符串格式和要转换的格式要一样 String time = "20:38:24"; DateTimeFormatter timeFormatter = DateTimeFormatter.ofPattern("HH:mm:ss"); LocalTime localTime = LocalTime.parse(time, timeFormatter); System.out.println(localTime); //字符串日期时间转datetime类型，注意字符串格式和要转换的格式要一样 String dateTime = "2022/11/24 20:59:24"; DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss"); LocalDateTime localDateTime = LocalDateTime.parse(dateTime, dateTimeFormatter); System.out.println(localDateTime); } } 输出结果：2022-11-24 20:38:24 2022-11-24T20:59:24java.time：更多API可以根据需要查看该包下的时间工具类。

AVA8-CompletableFuture常用API：runAfterBoth、applyToEither、acceptEither 、runAfterEither 、allOf、anyOf AVA8-CompletableFuture常用API：runAfterBoth、applyToEither、acceptEither 、runAfterEither 、allOf、anyOf1、runAfterBoth ：2个CompletableFuture都执行完后,再执行其它操作package com.example.study.java8.completableFutures.api; import java.util.concurrent.CompletableFuture; public class CompletableFutureAction2 { public static void main(String[] args) throws InterruptedException { //API-- 1、runAfterBoth: 2个都执行完后,再执行其它操作 CompletableFuture.supplyAsync(() -> { System.out.println(Thread.currentThread().getName() + "this is runing 1......"); return 1; }) .runAfterBoth(CompletableFuture.supplyAsync(() -> { System.out.println(Thread.currentThread().getName() + "this is runing 2......"); return 2; }), () -> System.out.println("done")); //为了防止主线程结束后，守护线程被关闭，模拟修改10000毫秒 Thread.sleep(10000); } }输出结果：ForkJoinPool.commonPool-worker-5this is runing 2...... ForkJoinPool.commonPool-worker-19this is runing 1...... done2、 applyToEither：其中一个CompletableFuture执行完，就将结果传给另一个Fuctionpackage com.example.study.java8.completableFutures.api; import java.util.concurrent.CompletableFuture; public class CompletableFutureAction2 { public static void main(String[] args) throws InterruptedException { //API-- 2、runAfterBoth: 其中一个CompletableFuture执行完，就将结果传递到另一个Function中。 CompletableFuture.supplyAsync(()->{ try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(Thread.currentThread().getName()+"this is one future..."); return 1; }).applyToEither(CompletableFuture.supplyAsync(()->{ try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(Thread.currentThread().getName()+"this is two future..."); return 2; }), v-> 10 * v ).thenAccept(System.out::println); //为了防止主线程结束后，守护线程被关闭，模拟修改10000毫秒 Thread.sleep(10000); } }输出结果：ForkJoinPool.commonPool-worker-5this is two future... 20 ForkJoinPool.commonPool-worker-19this is one future...3、acceptEither ：其中一个future执行完，就将结果传递到cutomer中消费package com.example.study.java8.completableFutures.api; import java.util.concurrent.CompletableFuture; public class CompletableFutureAction2 { public static void main(String[] args) throws InterruptedException { //API-- 3、acceptEither: 其中一个CompletableFuture执行完，就将结果传递到另一个Function中。 CompletableFuture.supplyAsync(()->{ try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(Thread.currentThread().getName()+"this is one future..."); return 1; }).acceptEither(CompletableFuture.supplyAsync(()->{ try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(Thread.currentThread().getName()+"this is two future..."); return 2; }), System.out::println ); //为了防止主线程结束后，守护线程被关闭，模拟修改10000毫秒 Thread.sleep(10000); } }输出结果：ForkJoinPool.commonPool-worker-5this is two future... 2 ForkJoinPool.commonPool-worker-19this is one future...4、runAfterEither :其中一个CompletableFuture执行完，就可以做其它操作了。不会将结果传递，可以做类似其中一个操作完后的消息通知功能。package com.example.study.java8.completableFutures.api; import java.util.concurrent.CompletableFuture; public class CompletableFutureAction2 { public static void main(String[] args) throws InterruptedException { //API-- 4、runAfterEither: 其中一个CompletableFuture执行完，就可以做其它操作了。不会将结果传递，可以做类似其中一个操作完后的消息通知功能。 CompletableFuture.supplyAsync(()->{ try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(Thread.currentThread().getName()+"this is one future..."); return 1; }).runAfterEither(CompletableFuture.supplyAsync(()->{ try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(Thread.currentThread().getName()+"this is two future..."); return 2; }),()-> System.out.println("其中一个future执行完成") ); //为了防止主线程结束后，守护线程被关闭，模拟修改10000毫秒 Thread.sleep(10000); } }输出结果：ForkJoinPool.commonPool-worker-5this is two future... 其中一个future执行完成 ForkJoinPool.commonPool-worker-19this is one future...5、 allOf： 静态方法，可直接调用。全部future执行完后，再进行消费package com.example.study.java8.completableFutures.api; import java.util.Arrays; import java.util.List; import java.util.concurrent.CompletableFuture; import static java.util.stream.Collectors.toList; public class CompletableFutureAction2 { public static void main(String[] args) throws InterruptedException { //API-- 5、allOf: 静态方法，可直接调用。全部future执行完后，再进行消费 List<CompletableFuture<Double>> completableFutureList = Arrays.asList(1, 2, 3, 4, 5) .stream().map(i -> CompletableFuture.supplyAsync((CompletableFutureAction2::get))) .collect(toList()); CompletableFuture[] completableFuturesArray = completableFutureList.toArray(new CompletableFuture[completableFutureList.size()]); CompletableFuture.allOf(completableFuturesArray).thenRun(()-> System.out.println("所有future执行完成")); //为了防止主线程结束后，守护线程被关闭，模拟修改10000毫秒 Thread.sleep(50000); } }输出结果：0.5653558041825968 0.5720868499613329 0.25643461386243427 0.9522248509043018 0.5483123698045103 所有future执行完成6、anyOf ：静态方法，可直接调用。其中一个future执行完后，就进行消费package com.example.study.java8.completableFutures.api; import java.util.Arrays; import java.util.Collection; import java.util.List; import java.util.Random; import java.util.concurrent.CompletableFuture; import static java.util.stream.Collectors.toList; public class CompletableFutureAction2 { private final static Random RANDOM = new Random(System.currentTimeMillis()); public static void main(String[] args) throws InterruptedException { //API-- 6、anyOf: 静态方法，可直接调用。其中一个future执行完后，就进行消费 List<CompletableFuture<Double>> futureList = Arrays.asList(1, 2, 3, 4, 5) .stream() .map(i -> CompletableFuture.supplyAsync(CompletableFutureAction2::get)) .collect(toList()); CompletableFuture[] futuresArray = futureList.toArray(new CompletableFuture[futureList.size()]); CompletableFuture.anyOf(futuresArray).thenRun(()-> System.out.println("其中一个future已执行完成")); //为了防止主线程结束后，守护线程被关闭，模拟修改10000毫秒 Thread.sleep(50000); } static double get(){ try { Thread.sleep(RANDOM.nextInt(100)); } catch (InterruptedException e) { e.printStackTrace(); } double value = RANDOM.nextDouble(); System.out.println(value); return value; } } 输出结果：0.41392777550489923 其中一个future已执行完成 0.7321854786542472 0.015636586751138104 0.8968276147964326 0.26576407363892185AVA8-CompletableFuture常用API：1、runAfterBoth2、applyToEither 3、acceptEither 4 、runAfterEither 5 、allOf 6、anyOf