redis opsforvalue方法 redistemplate.opsforvalue().set

1.set(K key, V value)
       新增一个字符串类型的值,key是键，value是值。html

redisTemplate.opsForValue().set("stringValue","bbb");  
2.get(Object key)
     获取key键对应的值。java

String stringValue = redisTemplate.opsForValue().get("stringValue")+"";  
System.out.println("经过get(Object key)方法获取set(K key, V value)方法新增的字符串值:" + stringValue);  
3.append(K key, String value)
    在原有的值基础上新增字符串到末尾。redis

redisTemplate.opsForValue().append("stringValue","aaa");  
String stringValueAppend = redisTemplate.opsForValue().get("stringValue")+"";  
System.out.println("经过append(K key, String value)方法修改后的字符串:"+stringValueAppend);  
4.get(K key, long start, long end)
截取key键对应值得字符串，从开始下标位置开始到结束下标的位置(包含结束下标)的字符串。spring

String cutString = redisTemplate.opsForValue().get("stringValue",0,3);  
System.out.println("经过get(K key, long start, long end)方法获取截取的字符串:"+cutString);  
5.getAndSet(K key, V value)
     获取原来key键对应的值并从新赋新值。api

String oldAndNewStringValue = redisTemplate.opsForValue().getAndSet("stringValue","ccc")+"";  
System.out.print("经过getAndSet(K key, V value)方法获取原来的" + oldAndNewStringValue + ",");  
String newStringValue = redisTemplate.opsForValue().get("stringValue")+"";  
System.out.println("修改事后的值:"+newStringValue);  
6.setBit(K key, long offset, boolean value)
    key键对应的值value对应的ascii码,在offset的位置(从左向右数)变为value。oracle

redisTemplate.opsForValue().setBit("stringValue",1,false);  
newStringValue = redisTemplate.opsForValue().get("stringValue")+"";  
System.out.println("经过setBit(K key,long offset,boolean value)方法修改事后的值:"+newStringValue);  
7.getBit(K key, long offset)
    判断指定的位置ASCII码的bit位是否为1。app

boolean bitBoolean = redisTemplate.opsForValue().getBit("stringValue",1);  
System.out.println("经过getBit(K key,long offset)方法判断指定bit位的值是:" + bitBoolean);  
8.size(K key)
     获取指定字符串的长度。ide

Long stringValueLength = redisTemplate.opsForValue().size("stringValue");  
System.out.println("经过size(K key)方法获取字符串的长度:"+stringValueLength);  
9.increment(K key, double delta)
    以增量的方式将double值存储在变量中。spa

double stringValueDouble = redisTemplate.opsForValue().increment("doubleValue",5);   
System.out.println("经过increment(K key, double delta)方法以增量方式存储double值:" + stringValueDouble);  
10.setIfAbsent(K key, V value)
      若是键不存在则新增,存在则不改变已经有的值。code

boolean absentBoolean = redisTemplate.opsForValue().setIfAbsent("absentValue","fff");  
System.out.println("经过setIfAbsent(K key, V value)方法判断变量值absentValue是否存在:" + absentBoolean);  
if(absentBoolean){  
    String absentValue = redisTemplate.opsForValue().get("absentValue")+"";  
    System.out.print(",不存在，则新增后的值是:"+absentValue);  
    boolean existBoolean = redisTemplate.opsForValue().setIfAbsent("absentValue","eee");  
    System.out.print(",再次调用setIfAbsent(K key, V value)判断absentValue是否存在并从新赋值:" + existBoolean);  
    if(!existBoolean){  
        absentValue = redisTemplate.opsForValue().get("absentValue")+"";  
        System.out.print("若是存在,则从新赋值后的absentValue变量的值是:" + absentValue);  
    }  
}  
11.set(K key, V value, long timeout, TimeUnit unit)
       设置变量值的过时时间。

redisTemplate.opsForValue().set("timeOutValue","timeOut",5,TimeUnit.SECONDS);  
String timeOutValue = redisTemplate.opsForValue().get("timeOutValue")+"";  
System.out.println("经过set(K key, V value, long timeout, TimeUnit unit)方法设置过时时间，过时以前获取的数据:"+timeOutValue);  
Thread.sleep(5*1000);  
timeOutValue = redisTemplate.opsForValue().get("timeOutValue")+"";  
System.out.print(",等待10s事后，获取的值:"+timeOutValue);  
12.set(K key, V value, long offset)
    覆盖从指定位置开始的值。

redisTemplate.opsForValue().set("absentValue","dd",1);  
String overrideString = redisTemplate.opsForValue().get("absentValue")+"";  
System.out.println("经过set(K key, V value, long offset)方法覆盖部分的值:"+overrideString);  
13.multiSet(Map<? extends K,? extends V> map)
     设置map集合到redis。

Map valueMap = new HashMap();  
valueMap.put("valueMap1","map1");  
valueMap.put("valueMap2","map2");  
valueMap.put("valueMap3","map3");  
redisTemplate.opsForValue().multiSet(valueMap);  
14.multiGet(Collection<K> keys)
      根据集合取出对应的value值。

//根据List集合取出对应的value值  
List paraList = new ArrayList();  
paraList.add("valueMap1");  
paraList.add("valueMap2");  
paraList.add("valueMap3");  
List<String> valueList = redisTemplate.opsForValue().multiGet(paraList);  
for (String value : valueList){  
    System.out.println("经过multiGet(Collection<K> keys)方法获取map值:" + value);  
}  
15.multiSetIfAbsent(Map<? extends K,? extends V> map)
      若是对应的map集合名称不存在，则添加，若是存在则不作修改。

Map valueMap = new HashMap();  
valueMap.put("valueMap1","map1");  
valueMap.put("valueMap2","map2");  
valueMap.put("valueMap3","map3");  
redisTemplate.opsForValue().multiSetIfAbsent(valueMap);