spring boot整合redis,以及设置缓存过期时间

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.
  *
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  */

 /*
  *
  *
  *
  *
  *
  * 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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