spring-boot 整合 redis
注：redis服务器要先开启
pom文件:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
配置文件yml:
spring:
redis:
#redis数据库地址
host: localhost
#redis端口号
port: 6379
timeout: 5000ms
#redis数据库索引，默认0
database: 1
基础环境已经搭建
接下来 我们测试上代码：
//注入redisTemplate
@Autowired
private StringRedisTemplate redisTemplate; @Test
public void setRedis() {
//缓存中最常用的方法
redisTemplate.opsForValue().set("first","siwei");
//设置缓存过期时间为30 单位：秒
//关于TimeUnit下面有部分源码截图
redisTemplate.opsForValue().set("second","siweiWu",30, TimeUnit.SECONDS);
System.out.println("存入缓存成功");
}
@Test
public void getRedis(){
String first = redisTemplate.opsForValue().get("first");
String second = redisTemplate.opsForValue().get("second"); System.out.println("取出缓存中first的数据是:"+first);
System.out.println("取出缓存中second的数据是:"+second); }
@Test
public void delRedis() {
//根据key删除缓存
Boolean first1 = redisTemplate.delete("first"); System.out.println("是否删除成功:"+first1);
}
StringRedisTemplate相关方法我也总结了一下，可能不是很全 不过还是够用了
上面设置缓存过期时间的TimeUnit源码 部分截图说明(后面会附上全部的源码——总390行，我就折叠一下了)：
先上截图
TimeUnit全部源码：
/*
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*/ /*
*
*
*
*
*
* Written by Doug Lea with assistance from members of JCP JSR-166
* Expert Group and released to the public domain, as explained at
* http://creativecommons.org/publicdomain/zero/1.0/
*/ package java.util.concurrent; /**
* A {@code TimeUnit} represents time durations at a given unit of
* granularity and provides utility methods to convert across units,
* and to perform timing and delay operations in these units. A
* {@code TimeUnit} does not maintain time information, but only
* helps organize and use time representations that may be maintained
* separately across various contexts. A nanosecond is defined as one
* thousandth of a microsecond, a microsecond as one thousandth of a
* millisecond, a millisecond as one thousandth of a second, a minute
* as sixty seconds, an hour as sixty minutes, and a day as twenty four
* hours.
*
* <p>A {@code TimeUnit} is mainly used to inform time-based methods
* how a given timing parameter should be interpreted. For example,
* the following code will timeout in 50 milliseconds if the {@link
* java.util.concurrent.locks.Lock lock} is not available:
*
* <pre> {@code
* Lock lock = ...;
* if (lock.tryLock(50L, TimeUnit.MILLISECONDS)) ...}</pre>
*
* while this code will timeout in 50 seconds:
* <pre> {@code
* Lock lock = ...;
* if (lock.tryLock(50L, TimeUnit.SECONDS)) ...}</pre>
*
* Note however, that there is no guarantee that a particular timeout
* implementation will be able to notice the passage of time at the
* same granularity as the given {@code TimeUnit}.
*
* @since 1.5
* @author Doug Lea
*/
public enum TimeUnit {
/**
* Time unit representing one thousandth of a microsecond
*/
NANOSECONDS {
public long toNanos(long d) { return d; }
public long toMicros(long d) { return d/(C1/C0); }
public long toMillis(long d) { return d/(C2/C0); }
public long toSeconds(long d) { return d/(C3/C0); }
public long toMinutes(long d) { return d/(C4/C0); }
public long toHours(long d) { return d/(C5/C0); }
public long toDays(long d) { return d/(C6/C0); }
public long convert(long d, TimeUnit u) { return u.toNanos(d); }
int excessNanos(long d, long m) { return (int)(d - (m*C2)); }
}, /**
* Time unit representing one thousandth of a millisecond
*/
MICROSECONDS {
public long toNanos(long d) { return x(d, C1/C0, MAX/(C1/C0)); }
public long toMicros(long d) { return d; }
public long toMillis(long d) { return d/(C2/C1); }
public long toSeconds(long d) { return d/(C3/C1); }
public long toMinutes(long d) { return d/(C4/C1); }
public long toHours(long d) { return d/(C5/C1); }
public long toDays(long d) { return d/(C6/C1); }
public long convert(long d, TimeUnit u) { return u.toMicros(d); }
int excessNanos(long d, long m) { return (int)((d*C1) - (m*C2)); }
}, /**
* Time unit representing one thousandth of a second
*/
MILLISECONDS {
public long toNanos(long d) { return x(d, C2/C0, MAX/(C2/C0)); }
public long toMicros(long d) { return x(d, C2/C1, MAX/(C2/C1)); }
public long toMillis(long d) { return d; }
public long toSeconds(long d) { return d/(C3/C2); }
public long toMinutes(long d) { return d/(C4/C2); }
public long toHours(long d) { return d/(C5/C2); }
public long toDays(long d) { return d/(C6/C2); }
public long convert(long d, TimeUnit u) { return u.toMillis(d); }
int excessNanos(long d, long m) { return 0; }
}, /**
* Time unit representing one second
*/
SECONDS {
public long toNanos(long d) { return x(d, C3/C0, MAX/(C3/C0)); }
public long toMicros(long d) { return x(d, C3/C1, MAX/(C3/C1)); }
public long toMillis(long d) { return x(d, C3/C2, MAX/(C3/C2)); }
public long toSeconds(long d) { return d; }
public long toMinutes(long d) { return d/(C4/C3); }
public long toHours(long d) { return d/(C5/C3); }
public long toDays(long d) { return d/(C6/C3); }
public long convert(long d, TimeUnit u) { return u.toSeconds(d); }
int excessNanos(long d, long m) { return 0; }
}, /**
* Time unit representing sixty seconds
*/
MINUTES {
public long toNanos(long d) { return x(d, C4/C0, MAX/(C4/C0)); }
public long toMicros(long d) { return x(d, C4/C1, MAX/(C4/C1)); }
public long toMillis(long d) { return x(d, C4/C2, MAX/(C4/C2)); }
public long toSeconds(long d) { return x(d, C4/C3, MAX/(C4/C3)); }
public long toMinutes(long d) { return d; }
public long toHours(long d) { return d/(C5/C4); }
public long toDays(long d) { return d/(C6/C4); }
public long convert(long d, TimeUnit u) { return u.toMinutes(d); }
int excessNanos(long d, long m) { return 0; }
}, /**
* Time unit representing sixty minutes
*/
HOURS {
public long toNanos(long d) { return x(d, C5/C0, MAX/(C5/C0)); }
public long toMicros(long d) { return x(d, C5/C1, MAX/(C5/C1)); }
public long toMillis(long d) { return x(d, C5/C2, MAX/(C5/C2)); }
public long toSeconds(long d) { return x(d, C5/C3, MAX/(C5/C3)); }
public long toMinutes(long d) { return x(d, C5/C4, MAX/(C5/C4)); }
public long toHours(long d) { return d; }
public long toDays(long d) { return d/(C6/C5); }
public long convert(long d, TimeUnit u) { return u.toHours(d); }
int excessNanos(long d, long m) { return 0; }
}, /**
* Time unit representing twenty four hours
*/
DAYS {
public long toNanos(long d) { return x(d, C6/C0, MAX/(C6/C0)); }
public long toMicros(long d) { return x(d, C6/C1, MAX/(C6/C1)); }
public long toMillis(long d) { return x(d, C6/C2, MAX/(C6/C2)); }
public long toSeconds(long d) { return x(d, C6/C3, MAX/(C6/C3)); }
public long toMinutes(long d) { return x(d, C6/C4, MAX/(C6/C4)); }
public long toHours(long d) { return x(d, C6/C5, MAX/(C6/C5)); }
public long toDays(long d) { return d; }
public long convert(long d, TimeUnit u) { return u.toDays(d); }
int excessNanos(long d, long m) { return 0; }
}; // Handy constants for conversion methods
static final long C0 = 1L;
static final long C1 = C0 * 1000L;
static final long C2 = C1 * 1000L;
static final long C3 = C2 * 1000L;
static final long C4 = C3 * 60L;
static final long C5 = C4 * 60L;
static final long C6 = C5 * 24L; static final long MAX = Long.MAX_VALUE; /**
* Scale d by m, checking for overflow.
* This has a short name to make above code more readable.
*/
static long x(long d, long m, long over) {
if (d > over) return Long.MAX_VALUE;
if (d < -over) return Long.MIN_VALUE;
return d * m;
} // To maintain full signature compatibility with 1.5, and to improve the
// clarity of the generated javadoc (see 6287639: Abstract methods in
// enum classes should not be listed as abstract), method convert
// etc. are not declared abstract but otherwise act as abstract methods. /**
* Converts the given time duration in the given unit to this unit.
* Conversions from finer to coarser granularities truncate, so
* lose precision. For example, converting {@code 999} milliseconds
* to seconds results in {@code 0}. Conversions from coarser to
* finer granularities with arguments that would numerically
* overflow saturate to {@code Long.MIN_VALUE} if negative or
* {@code Long.MAX_VALUE} if positive.
*
* <p>For example, to convert 10 minutes to milliseconds, use:
* {@code TimeUnit.MILLISECONDS.convert(10L, TimeUnit.MINUTES)}
*
* @param sourceDuration the time duration in the given {@code sourceUnit}
* @param sourceUnit the unit of the {@code sourceDuration} argument
* @return the converted duration in this unit,
* or {@code Long.MIN_VALUE} if conversion would negatively
* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
*/
public long convert(long sourceDuration, TimeUnit sourceUnit) {
throw new AbstractMethodError();
} /**
* Equivalent to
* {@link #convert(long, TimeUnit) NANOSECONDS.convert(duration, this)}.
* @param duration the duration
* @return the converted duration,
* or {@code Long.MIN_VALUE} if conversion would negatively
* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
*/
public long toNanos(long duration) {
throw new AbstractMethodError();
} /**
* Equivalent to
* {@link #convert(long, TimeUnit) MICROSECONDS.convert(duration, this)}.
* @param duration the duration
* @return the converted duration,
* or {@code Long.MIN_VALUE} if conversion would negatively
* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
*/
public long toMicros(long duration) {
throw new AbstractMethodError();
} /**
* Equivalent to
* {@link #convert(long, TimeUnit) MILLISECONDS.convert(duration, this)}.
* @param duration the duration
* @return the converted duration,
* or {@code Long.MIN_VALUE} if conversion would negatively
* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
*/
public long toMillis(long duration) {
throw new AbstractMethodError();
} /**
* Equivalent to
* {@link #convert(long, TimeUnit) SECONDS.convert(duration, this)}.
* @param duration the duration
* @return the converted duration,
* or {@code Long.MIN_VALUE} if conversion would negatively
* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
*/
public long toSeconds(long duration) {
throw new AbstractMethodError();
} /**
* Equivalent to
* {@link #convert(long, TimeUnit) MINUTES.convert(duration, this)}.
* @param duration the duration
* @return the converted duration,
* or {@code Long.MIN_VALUE} if conversion would negatively
* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
* @since 1.6
*/
public long toMinutes(long duration) {
throw new AbstractMethodError();
} /**
* Equivalent to
* {@link #convert(long, TimeUnit) HOURS.convert(duration, this)}.
* @param duration the duration
* @return the converted duration,
* or {@code Long.MIN_VALUE} if conversion would negatively
* overflow, or {@code Long.MAX_VALUE} if it would positively overflow.
* @since 1.6
*/
public long toHours(long duration) {
throw new AbstractMethodError();
} /**
* Equivalent to
* {@link #convert(long, TimeUnit) DAYS.convert(duration, this)}.
* @param duration the duration
* @return the converted duration
* @since 1.6
*/
public long toDays(long duration) {
throw new AbstractMethodError();
} /**
* Utility to compute the excess-nanosecond argument to wait,
* sleep, join.
* @param d the duration
* @param m the number of milliseconds
* @return the number of nanoseconds
*/
abstract int excessNanos(long d, long m); /**
* Performs a timed {@link Object#wait(long, int) Object.wait}
* using this time unit.
* This is a convenience method that converts timeout arguments
* into the form required by the {@code Object.wait} method.
*
* <p>For example, you could implement a blocking {@code poll}
* method (see {@link BlockingQueue#poll BlockingQueue.poll})
* using:
*
* <pre> {@code
* public synchronized Object poll(long timeout, TimeUnit unit)
* throws InterruptedException {
* while (empty) {
* unit.timedWait(this, timeout);
* ...
* }
* }}</pre>
*
* @param obj the object to wait on
* @param timeout the maximum time to wait. If less than
* or equal to zero, do not wait at all.
* @throws InterruptedException if interrupted while waiting
*/
public void timedWait(Object obj, long timeout)
throws InterruptedException {
if (timeout > 0) {
long ms = toMillis(timeout);
int ns = excessNanos(timeout, ms);
obj.wait(ms, ns);
}
} /**
* Performs a timed {@link Thread#join(long, int) Thread.join}
* using this time unit.
* This is a convenience method that converts time arguments into the
* form required by the {@code Thread.join} method.
*
* @param thread the thread to wait for
* @param timeout the maximum time to wait. If less than
* or equal to zero, do not wait at all.
* @throws InterruptedException if interrupted while waiting
*/
public void timedJoin(Thread thread, long timeout)
throws InterruptedException {
if (timeout > 0) {
long ms = toMillis(timeout);
int ns = excessNanos(timeout, ms);
thread.join(ms, ns);
}
} /**
* Performs a {@link Thread#sleep(long, int) Thread.sleep} using
* this time unit.
* This is a convenience method that converts time arguments into the
* form required by the {@code Thread.sleep} method.
*
* @param timeout the minimum time to sleep. If less than
* or equal to zero, do not sleep at all.
* @throws InterruptedException if interrupted while sleeping
*/
public void sleep(long timeout) throws InterruptedException {
if (timeout > 0) {
long ms = toMillis(timeout);
int ns = excessNanos(timeout, ms);
Thread.sleep(ms, ns);
}
} }
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