Spring Data Redis 入門（二）----ValueOperations
阿新 • • 發佈：2019-02-13
ValueOperations 介面說明 ：
在org.springframework.data.redis.core包裡 點開有具體介面名稱以及說明，下面簡單談談自己理解;這個包主要就是實現對單個值進行操作，一個key 對一個Value 不能一個key對應多個值。。如果多個值 需要用到ListOperations等等。
下面是對每個介面方法進行簡單的測試：
如果有不對的地方歡迎指正package com.ly; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Random; import java.util.UUID; import java.util.concurrent.TimeUnit; import org.junit.Before; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.redis.core.BoundValueOperations; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.data.redis.core.StringRedisTemplate; import org.springframework.data.redis.core.ValueOperations; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; import com.ly.entity.Book; import com.ly.entity.User; /** * ValueOpertions 說明：只能一個鍵對應一個值.可以存放Map List等json. * @author ly * */ @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = { "classpath*:applicationContext.xml" }) public class ValueOperationsTest { @Autowired private StringRedisTemplate stringRedisTemplate; @Autowired private RedisTemplate<String, Object> redisTemplate; private ValueOperations<String, String> opsForValue=null; //操作單表的Object private ValueOperations<String, Object> opsForValueToObject=null; private BoundValueOperations<String, String> boundValueOps=null; @Before public void setUp() throws Exception { opsForValue=stringRedisTemplate.opsForValue(); opsForValueToObject=redisTemplate.opsForValue(); boundValueOps=stringRedisTemplate.boundValueOps("boundValueOps:test"); } /** * 指定Key 只對Key進行操作 */ @Test public void testBoundValueOps() { boundValueOps.set("boundValueOps"); } /** *V get(Object key); *void set(K key, V value); * */ @Test public void testGetSet() { System.out.println(111); opsForValue.set("TestValueOperations:test", "test"); System.err.println(opsForValue.get("TestValueOperations:test")); opsForValue.set("TestValueOperations:mkt", "test"); opsForValue.set("boundValueOps:test", "test"); } /** * 設定過期時間 * void set(K key, V value, long timeout, TimeUnit unit); * @throws InterruptedException */ @Test public void testSetTimeOut() throws InterruptedException { opsForValue.set("TestValueOperations:test", "test1", 10, TimeUnit.SECONDS); Thread.sleep(5000); System.out.println(opsForValue.get("TestValueOperations:test"));//liu2 Thread.sleep(5000); System.out.println(opsForValue.get("TestValueOperations:test"));//null } /** * void set(K key, V value, long offset); */ @Test public void testSetOffset() { opsForValue.set("TestValueOperations:ly", "liuyang"); System.err.println(opsForValue.get("TestValueOperations:ly")); opsForValue.set("TestValueOperations:ly", "666", 3); System.err.println(opsForValue.get("TestValueOperations:ly"));//liu666g } /** * Boolean setIfAbsent(K key, V value); * key唯一 如果key存在 就返回false 並且無法插入 */ @Test public void testSetIfAbsent() { System.out.println(opsForValue.setIfAbsent("TestValueOperations:ly1", "tss"));//true System.out.println(opsForValue.setIfAbsent("TestValueOperations:ly", "tss"));//false } /** * 多個鍵值 封裝成map 一起進去 * void multiSet(Map<? extends K, ? extends V> map); */ @Test public void testMultiSet() { Map<String, String> map=new HashMap<String, String>(); map.put("MultiSet:test1", "1"); map.put("MultiSet:test2", "2"); map.put("MultiSet:test3", "3"); opsForValue.multiSet(map); } /** * List<V> multiGet(Collection<K> keys); * out 1,2,3 */ @Test public void testMultiGet() { List<String> list=new ArrayList<String>(); list.add("MultiSet:test1"); list.add("MultiSet:test2"); list.add("MultiSet:test3"); for (String string : opsForValue.multiGet(list)) { System.out.println(string); } } /** * Boolean multiSetIfAbsent(Map<? extends K, ? extends V> map); * 只要map中的key存在就返回false 也不會插入 */ @Test public void testMultiSetIfAbsent() { Map<String,String> map=new HashMap<String, String>(); map.put("MultiSet:test2", "MultiSetIfAbsent2"); map.put("MultiSet:test3", "MultiSetIfAbsent3"); map.put("MultiSet:test4", "MultiSetIfAbsent4"); System.out.println(opsForValue.multiSetIfAbsent(map));//false System.out.println(opsForValue.get("MultiSet:test2"));//2 System.out.println(opsForValue.get("MultiSet:test4"));//null } /** * V getAndSet(K key, V value); */ @Test public void testGetAndSet() { //key TestValueOperations:ly Value liu666g opsForValue.getAndSet("TestValueOperations:ly", "GetAndSet"); System.out.println(opsForValue.get("TestValueOperations:ly")); } /** * Long increment(K key, long delta); Long 加減 增長 */ @Test public void testIncrement() { opsForValue.set("increment:test1", "1"); System.out.println(opsForValue.get("increment:test1"));//1 System.out.println(opsForValue.increment("increment:test1", 2L));//3 } /** * Double increment(K key, double delta); */ @Test public void testIncrementForDouble() { opsForValue.set("increment:test2", "1"); System.out.println(opsForValue.get("increment:test2"));//1 System.out.println(opsForValue.increment("increment:test2", 3.33));//3 } /** * Integer append(K key, String value); * 如果key已經存在並且是一個字串，則該命令將該值追加到字串的末尾。如果鍵不存在， * 則它被建立並設定為空字串，因此APPEND在這種特殊情況下將類似於SET。 */ @Test public void testAppend() { opsForValue.append("append:test1", "test1"); System.out.println(opsForValue.get("append:test1"));//test1 opsForValue.set("append:test2", "liu12"); opsForValue.append("append:test2", "test2"); System.out.println(opsForValue.get("append:test2"));//liu12test2 } /** * Long size(K key); */ @Test public void testSize() { System.out.println(opsForValue.size("TestValueOperations:ly"));//Value For liu666g 輸出7 } /** * Boolean setBit(K key, long offset, boolean value); * 這個偏移有啥用 * //true為1，false為0 //對 key 所儲存的字串值，設定或清除指定偏移量上的位(bit) //key鍵對應的值value對應的ASCII碼,在offset的位置(從左向右數)變為value */ @Test public void testSetBit() { opsForValue.set("TestSetBit:ly", "TEST"); System.out.println(opsForValue.setBit("TestSetBit:ly", 4, true));//true System.out.println(opsForValue.get("TestSetBit:ly"));//lmu15 for(int i = 0 ; i<"TEST".length()*8;i++){ if(opsForValue.getBit("TestSetBit:ly", i)){ System.out.print(1); }else{ System.out.print(0); } } } /** * Boolean delete(K key) * Long delete(Collection<K> keys) * */ @Test public void testDelete() { //單條記錄 System.out.println(stringRedisTemplate.delete("TestValueOperations?test")); List<String> list=new ArrayList<String>(); list.add("TestValueOperations:test"); System.out.println(stringRedisTemplate.delete(list)); } /************************************************************操作List Map等Json*********************************************************************/ public User userConfig() { Random rand = new Random(); UUID uuid = UUID.randomUUID(); User user=new User(); user.setId(rand.nextLong()+1); user.setName(uuid.toString()); List<Book>books=new ArrayList<Book>(); Book book=new Book(); book.setBookName(uuid.toString()); book.setId(rand.nextLong()+1); books.add(book); user.setBooks(books); return user; } @Test public void setObject() { opsForValueToObject.set("opsForValue:setObject", userConfig()); } }