redis学习笔记-java操作String类型
package com.naxsu.redis;import static org.junit.Assert.*;import java.util.ArrayList;import java.util.List;import org.junit.Before;import org.junit.Test;import redis.clients.jedis.Jedis;import redis.clients.jedis.exceptions.JedisDataException;/** * 对String类型进行操作 * 为了僻免上面的测试的结果影响到当前测试方法，测试之前先把数据库给清空 */public class StringValuesCommandsTest{Jedis jedis = null;@Beforepublic void before(){jedis = new Jedis("192.168.26.128");jedis.auth("123456");jedis.flushDB();}@Testpublic void flushDB() {jedis.flushDB();// 清空redis} @Test public void setAndGet() { //对key为foo进行赋值 String status = jedis.set("foo", "bar"); //返回OK assertEquals("OK", status); //获取key为foo的值 String value = jedis.get("foo"); //取出的值为bar,所以相等 assertEquals("bar", value); //由于不存在名为bar的key,所以取出来的值为null assertEquals(null, jedis.get("bar")); } @Test public void getSet() { //将foo的值设为bar，并返回foo的旧值 String value = jedis.getSet("foo", "bar"); //旧值为null assertEquals(null, value); value = jedis.get("foo"); assertEquals("bar", value); } @Test public void mget() { //mget:返回所有(一个或多个)给定key的值 List<String> values = jedis.mget("foo", "bar"); List<String> expected = new ArrayList<String>(); expected.add(null); expected.add(null); assertEquals(expected, values); jedis.set("foo", "bar"); expected = new ArrayList<String>(); expected.add("bar"); expected.add(null); values = jedis.mget("foo", "bar"); assertEquals(expected, values); jedis.set("bar", "foo"); expected = new ArrayList<String>(); expected.add("bar"); expected.add("foo"); values = jedis.mget("foo", "bar"); assertEquals(expected, values); } @Test public void setnx() { //setnx：将key的值设为value，当且仅当key不存在 long status = jedis.setnx("foo", "bar"); assertEquals(1, status); assertEquals("bar", jedis.get("foo")); status = jedis.setnx("foo", "bar2"); assertEquals(0, status); assertEquals("bar", jedis.get("foo")); } @Test public void setex() { //给foo设置生存时间设为20秒,值为bar String status = jedis.setex("foo", 20, "bar"); assertEquals("OK", status); //返回foo的剩余生存时间 long ttl = jedis.ttl("foo"); assertTrue(ttl > 0 && ttl <= 20); } @Test public void mset() { //mset:同时设置一个或多个key-value对 String status = jedis.mset("foo", "bar", "bar", "foo"); assertEquals("OK", status); assertEquals("bar", jedis.get("foo")); assertEquals("foo", jedis.get("bar")); } @Test public void msetnx() { //msetnx:同时设置一个或多个key-value对，当且仅当key不存在 long status = jedis.msetnx("foo", "bar", "bar", "foo"); assertEquals(1, status); assertEquals("bar", jedis.get("foo")); assertEquals("foo", jedis.get("bar")); status = jedis.msetnx("foo", "bar1", "bar2", "foo2"); assertEquals(0, status); assertEquals("bar", jedis.get("foo")); assertEquals("foo", jedis.get("bar")); } @Test(expected = JedisDataException.class) public void incrWrongValue() { jedis.set("foo", "bar"); //foo的值是字符串类型，执行incr函数即抛出异常 jedis.incr("foo"); } @Test public void incr() { //如果foo不存在，以0为foo的初始值，然后执行INCR操作 long value = jedis.incr("foo"); assertEquals(1, value); value = jedis.incr("foo"); assertEquals(2, value); } @Test(expected = JedisDataException.class) public void incrByWrongValue() { jedis.set("foo", "bar"); //foo的值是字符串，给他增加2净抛出异常 jedis.incrBy("foo", 2); } @Test public void incrBy() { //如果foo不存在，以0为foo的初始值，然后执行INCRBY命令，增加2。 long value = jedis.incrBy("foo", 2); assertEquals(2, value); value = jedis.incrBy("foo", 2); assertEquals(4, value); } @Test(expected = JedisDataException.class) public void decrWrongValue() { jedis.set("foo", "bar"); //foo的值为字符串，不能操作减一 jedis.decr("foo"); } @Test public void decr() { //如果foo不存在，以0为foo的初始值，然后执行DECR操作。 long value = jedis.decr("foo"); assertEquals(-1, value); value = jedis.decr("foo"); assertEquals(-2, value); } @Test(expected = JedisDataException.class) public void decrByWrongValue() { jedis.set("foo", "bar"); //foo的值为字符串，不能操作减2 jedis.decrBy("foo", 2); } @Test public void decrBy() { long value = jedis.decrBy("foo", 2); assertEquals(-2, value); value = jedis.decrBy("foo", 2); assertEquals(-4, value); } @Test public void append() { //foo不存在，给foor的值设为bar，返回append后的值长度 long value = jedis.append("foo", "bar"); assertEquals(3, value); assertEquals("bar", jedis.get("foo")); //再次append,在之前的值之后 value = jedis.append("foo", "bar"); assertEquals(6, value); assertEquals("barbar", jedis.get("foo")); } @Test public void substr() { jedis.set("s", "This is a string"); //截字符串操作，没什么好说的 assertEquals("This", jedis.substr("s", 0, 3)); assertEquals("ing", jedis.substr("s", -3, -1)); assertEquals("This is a string", jedis.substr("s", 0, -1)); assertEquals(" string", jedis.substr("s", 9, 100000)); } @Test public void strlen() { jedis.set("s", "This is a string"); assertEquals("This is a string".length(), jedis.strlen("s").intValue()); } @Test public void incrLargeNumbers() { long value = jedis.incr("foo"); assertEquals(1, value); assertEquals(1L + Integer.MAX_VALUE, (long) jedis.incrBy("foo", Integer.MAX_VALUE)); } @Test(expected = JedisDataException.class) public void incrReallyLargeNumbers() { jedis.set("foo", Long.toString(Long.MAX_VALUE)); long value = jedis.incr("foo"); assertEquals(Long.MIN_VALUE, value); }} 源码包迟点发布
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