在項目中,緩存以及mq消息隊列可以說是不可或缺的2個重要技術。前者主要是爲了減輕數據庫壓力，大幅度提升性能。後者主要是爲了提高用戶的體驗度，我理解的是再後端做的一個ajax請求(異步),並且像ribbmitmq等消息隊列有重試機制等功能。
這裏主要講redis如何把對象，集合存入，並且取出.
1.在啓動類上加入如下代碼
private Jedis jedis;private JedisPoolConfig config;private JedisShardInfo sharInfo;@Beanpublic Jedis jedis(){//連接redis服務器，192.168.0.100:6379// jedis = new Jedis("192.168.0.100", 6379);// //權限認證// jedis.auth("123456");// 操作單獨的文本串config = new JedisPoolConfig();
config.setMaxIdle(1000);//最大空閒時間config.setMaxWaitMillis(1000); //最大等待時間config.setMaxTotal(500); //redis池中最大對象個數sharInfo = new JedisShardInfo("192.168.0.100", 6379);
sharInfo.setPassword("123456");
sharInfo.setConnectionTimeout(5000);//鏈接超時時間jedis = new Jedis(sharInfo);return jedis;
}2.在application.yml當中加入redis配置
spring:
redis:
database: 0
host: 101.132.191.77
port: 6379
password: 123456
pool:
max-idle: 8 #連接池最大連接數（使用負值表示沒有限制）
min-idle: 0 # 連接池中的最小空閒連接
max-active: 8 # 連接池最大阻塞等待時間（使用負值表示沒有限制）
max-wait: -1 # 連接池中的最大空閒連接
timeout: 5000 # 連接超時時間（毫秒）3..新建SerializeUtil類，這個類主要是爲了將對象序列化redis當中
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;/**
public class SerializeUtil
{
public static byte[] serialize(Object object) {
ObjectOutputStream oos = null;
ByteArrayOutputStream baos = null;
try {// 序列化baos = new ByteArrayOutputStream();
oos = new ObjectOutputStream(baos);
oos.writeObject(object);
byte[] bytes = baos.toByteArray();
return bytes;
} catch (Exception e) {
}return null;
}
public static Object unserialize( byte[] bytes) {
ByteArrayInputStream bais = null;
try {
// 反序列化bais = new ByteArrayInputStream(bytes);
ObjectInputStream ois = new ObjectInputStream(bais);
return ois.readObject();
} catch (Exception e) {
}return null;
}
}4.我封裝了一個RedisServiceImpl類，主要是用對redis設值和取值
redisServiceImpl.set主要是傳object,setStr主要設置string
import com.ys.util.redis.SerializeUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import redis.clients.jedis.Jedis;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
@Service
public class RedisServiceImpl
{@Autowired
private StringRedisTemplate stringRedisTemplate;
@Autowired
private Jedis jedis;
public void setStr(String key, String value) {
setStr(key, value, null);
}
public void setStr(String key, Object value, Long time)
{if(value == null){
return;
}if(value instanceof String){
String obj = (String) value;
stringRedisTemplate.opsForValue().set(key, obj);
}else if(value instanceof List){
List obj = (List) value;
stringRedisTemplate.opsForList().leftPushAll(key,obj);
}else if(value instanceof Map){
Map obj = (Map) value;
stringRedisTemplate.opsForHash().putAll(key,obj);
}if (time != null)
stringRedisTemplate.expire(key, time, TimeUnit.SECONDS);
}
public Object getKey(String key)
{return stringRedisTemplate.opsForValue().get(key);
}
public void delKey(String key) {
stringRedisTemplate.delete(key);
}
public boolean del(String key)
{return jedis.del(key.getBytes())>0;
}
}5.測試redis是否ok，編寫redisController類
import com.ys.service.impl.RedisServiceImpl;
import com.ys.vo.IqProduct;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
@RestController
public class RedisServiceController
{
@Autowired
private RedisServiceImpl redisService;
@RequestMapping(value = "/setredis")
public String setredis(String keyredis){
redisService.setStr(keyredis,"2018年1月26日");
return "保存成功,請訪問getredis查詢redis";
}
@RequestMapping(value = "/setObj")
public String setObj(String keyredis){
IqProduct iqProduct = new IqProduct();
iqProduct.setSort(1);
iqProduct.setTimestamp(new Date().getTime());
iqProduct.setProductName("productname");
// list.add(iqProduct);
redisService.set(keyredis, iqProduct);
return "保存成功,請訪問getredis查詢redis";
}
@RequestMapping(value = "/getObj")
public Object getObj(String keyredis){
Object object = redisService.get(keyredis);
if(object !=null){
IqProduct iqProduct = (IqProduct) object;
System. out.println(iqProduct.getProductName());
System. out.println(iqProduct.getId());
System. out.println(iqProduct.getTimestamp());
}return object;
}
@RequestMapping(value = "/delObj")
public boolean delObj(String keyredis)
{boolean del = redisService.del(keyredis);
return del;
}
@RequestMapping(value = "/getredis")
public String getredis(String keyredis){
String getredis = (String) redisService.getKey(keyredis);
return "redis的key是===>"+getredis;
}
@RequestMapping(value = "/delredis")
public String delredis(String keyredis){
redisService.delKey(keyredis);
return "刪除成功，請通過getredis進行查詢";
}
@RequestMapping(value = "/setList")
public String setList(String keyredis){
List list = new ArrayList();for (int i = 0;i<10;i++){
IqProduct iqProduct = new IqProduct();
iqProduct.setSort(1);
iqProduct.setTimestamp(new Date().getTime());
iqProduct.setProductName("productname");
list.add(iqProduct);
}
redisService.set(keyredis, list);
return "保存成功,請訪問getredis查詢redis";
}
@RequestMapping(value = "/getList")
public Object getList(String keyredis){
Object object = redisService.get(keyredis);
if(object !=null){
List<IqProduct> iqProducts = (List<IqProduct>) object;
for (int i = 0;i<iqProducts.size();i++){
IqProduct iqProduct = iqProducts.get(i);
System. out.println(iqProduct.getProductName());
System. out.println(iqProduct.getId());
System. out.println(iqProduct.getTimestamp());
}
}return object;
}
@RequestMapping(value = "/delList")
public boolean delList(String keyredis)
{
boolean del = redisService.del(keyredis);return del;
}
}6.測試結果
