Redistemplate common collection instructions opsforlist (III)

​ The basic configuration has been introduced in the previous 《RedisTemplate Instructions for common sets ( One )》 Has been introduced in , Now let's introduce it directly opsForList() Use of methods ：

1、leftPush(K key, V value)

Add the element value to the left of the variable .

redisTemplate.opsForList().leftPush("list","a");
redisTemplate.opsForList().leftPush("list","b");
redisTemplate.opsForList().leftPush("list","c");

2、index(K key, long index)

Gets the value of the specified location in the collection .

String listValue = redisTemplate.opsForList().index("list",1) + "";
System.out.println(" adopt index(K key, long index) Method to get the value of the specified location :" + listValue);

3、range(K key, long start, long end)

Get the value of the specified interval .

List<Object> list =  redisTemplate.opsForList().range("list",0,-1);
System.out.println(" adopt range(K key, long start, long end) Method to get the collection value of the specified range :"+list);

4、leftPush(K key, V pivot, V value)

Place the last parameter value before the first intermediate parameter in the specified set , If an intermediate parameter value exists .

redisTemplate.opsForList().leftPush("list","a","n");
list =  redisTemplate.opsForList().range("list",0,-1);
System.out.println(" adopt leftPush(K key, V pivot, V value) Method to put the value in front of the specified parameter value :" + list);

5、leftPushAll(K key, V… values)

Batch add parameter elements to the left .

redisTemplate.opsForList().leftPushAll("list","w","x","y");
list =  redisTemplate.opsForList().range("list",0,-1);
System.out.println(" adopt leftPushAll(K key, V... values) Method to batch add elements :" + list);

6、leftPushAll(K key, Collection values)

Batch add elements to the left as a collection .

List newList = new ArrayList();
newList.add("o");
newList.add("p");
newList.add("q");
redisTemplate.opsForList().leftPushAll("list",newList);
list =  redisTemplate.opsForList().range("list",0,-1);
System.out.println(" adopt leftPushAll(K key, Collection<V> values) Method to batch add elements in the form of a collection :" + list);

7、leftPushIfPresent(K key, V value)

If there is a collection, add the element .

redisTemplate.opsForList().leftPushIfPresent("presentList","o");
list =  redisTemplate.opsForList().range("presentList",0,-1);
System.out.println(" adopt leftPushIfPresent(K key, V value) Method to add elements to an existing collection :" + list);

8、rightPush(K key, V value)

Add elements to the far right of the collection .

redisTemplate.opsForList().rightPush("list","w");
list =  redisTemplate.opsForList().range("list",0,-1);
System.out.println(" adopt rightPush(K key, V value) Method to add an element to the far right :" + list);

9、rightPush(K key, V pivot, V value)

Add the element value of the third parameter variable to the right of the second parameter variable element in the set for the first time .

redisTemplate.opsForList().rightPush("list","w","r");
list =  redisTemplate.opsForList().range("list",0,-1);
System.out.println(" adopt rightPush(K key, V pivot, V value) Method to add an element to the far right :" + list);

10、rightPushAll(K key, V… values)

Batch add elements to the right .

redisTemplate.opsForList().rightPushAll("list","j","k");
list =  redisTemplate.opsForList().range("list",0,-1);
System.out.println(" adopt rightPushAll(K key, V... values) Method to batch add elements to the far right :" + list);

11、rightPushAll(K key, Collection values)

Add elements to the right as a collection .

newList.clear();
newList.add("g");
newList.add("h");
redisTemplate.opsForList().rightPushAll("list",newList);
list =  redisTemplate.opsForList().range("list",0,-1);
System.out.println(" adopt rightPushAll(K key, Collection<V> values) Method to batch add elements to the far right in a collection :" + list);

12、rightPushIfPresent(K key, V value)

Add elements to an existing collection .

redisTemplate.opsForList().rightPushIfPresent("presentList","d");
list =  redisTemplate.opsForList().range("presentList",0,-1);
System.out.println(" adopt rightPushIfPresent(K key, V value) Method adds elements to the rightmost side of the existing collection :" + list);

13、size(K key)

Get collection length .

long listLength = redisTemplate.opsForList().size("list");
System.out.println(" adopt size(K key) Method get collection list The length of is :" + listLength);

14、leftPop(K key)

​ Remove the first element on the left in the collection .

Object popValue = redisTemplate.opsForList().leftPop("list");
System.out.print(" adopt leftPop(K key) The element removed by the method is :" + popValue);
list =  redisTemplate.opsForList().range("list",0,-1);
System.out.println(", The remaining elements are :" + list);

15、leftPop(K key, long timeout, TimeUnit unit)

Remove the left element of the collection in the waiting time , If there is no element after waiting time, exit .

popValue = redisTemplate.opsForList().leftPop("presentList",1, TimeUnit.SECONDS);
System.out.print(" adopt leftPop(K key, long timeout, TimeUnit unit) The element removed by the method is :" + popValue);
list =  redisTemplate.opsForList().range("presentList",0,-1);
System.out.println(", The remaining elements are :" + list);

16、rightPop(K key)

​ Remove the element on the right side of the collection .

​

popValue = redisTemplate.opsForList().rightPop("list");
System.out.print(" adopt rightPop(K key) The element removed by the method is :" + popValue);
list =  redisTemplate.opsForList().range("list",0,-1);
System.out.println(", The remaining elements are :" + list);

17、rightPop(K key, long timeout, TimeUnit unit)

Remove the elements on the right side of the collection in the waiting time , If there is no element after waiting time, exit .

popValue = redisTemplate.opsForList().rightPop("presentList",1, TimeUnit.SECONDS);
System.out.print(" adopt rightPop(K key, long timeout, TimeUnit unit) The element removed by the method is :" + popValue);
list =  redisTemplate.opsForList().range("presentList",0,-1);
System.out.println(", The remaining elements are :" + list);

18、rightPopAndLeftPush(K sourceKey, K destinationKey)

Remove the element on the right side of the collection , At the same time, add an element on the left .

popValue = redisTemplate.opsForList().rightPopAndLeftPush("list","12");
System.out.print(" adopt rightPopAndLeftPush(K sourceKey, K destinationKey) The element removed by the method is :" + popValue);
list =  redisTemplate.opsForList().range("list",0,-1);
System.out.println(", The remaining elements are :" + list);

19、rightPopAndLeftPush(K sourceKey, K destinationKey, long timeout, TimeUnit unit)

Remove the elements on the right side of the collection in the waiting time , At the same time, add elements on the left , If there is no element after waiting time, exit .

popValue = redisTemplate.opsForList().rightPopAndLeftPush("presentList","13",1,TimeUnit.SECONDS);
System.out.println(" adopt rightPopAndLeftPush(K sourceKey, K destinationKey, long timeout, TimeUnit unit) The element removed by the method is :" + popValue);
list =  redisTemplate.opsForList().range("presentList",0,-1);
System.out.print(", The remaining elements are :" + list);

20、set(K key, long index, V value)

* Inserts an element at the specified location in the collection *, If an element already exists at the specified location , Coverage , If not, add , Exceeds the subscript set *+n* May be an error .

redisTemplate.opsForList().set("presentList",3,"15");
list =  redisTemplate.opsForList().range("presentList",0,-1);
System.out.print(" adopt set(K key, long index, V value) Method after adding an element at the specified position :" + list);

21*、remove(K key, long count, Object value)

The first count event to remove an element equal to the value from the list stored in the key .count> 0： Delete the first element equal to the value moved from left to right ;count< 0： The value of the first element moved from left to right is equal to that of the first element deleted ;count = 0： Delete equals value All elements of .

long removeCount = redisTemplate.opsForList().remove("list",0,"w");
list =  redisTemplate.opsForList().range("list",0,-1);
System.out.println(" adopt remove(K key, long count, Object value) Method to remove the number of elements :" + removeCount);
System.out.println(", The remaining elements :" + list);

22、trim(K key, long start, long end)

Intercept the length of set elements , Data within retention length .

redisTemplate.opsForList().trim("list",0,5);
list =  redisTemplate.opsForList().range("list",0,-1);
System.out.println(" adopt trim(K key, long start, long end) Method to intercept the remaining elements :" + list);