redis 初学知识点概要

参考地址https://www.cnblogs.com/springboot/p/8907884.html

1 redis可以存储五种数据类型：string、list、set、hash、zset（有序集合）。
2 在存取对象时必须实现序列化（将对象的瞬时状态以IO流的形式输出成文件放在硬盘中）和反序列化（将对象从文件中以IO流写入）。
3 java中使用redis,可以创建SerializeUtil 类处理对象的序列化方法。
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 封装了一个RedisServiceImpl类，主要是用对redis设值和取值。
redisServiceImpl.set主要是传object,setStr主要设置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);
}

/*set Object/
public String set(String key,Object object)
{
return jedis.set(key.getBytes(), SerializeUtil.serialize(object));
}

/*get Object/
public Object get(String key)
{
byte[] value = jedis.get(key.getBytes());
return SerializeUtil. unserialize(value);
}

/delete a key/
public boolean del(String key)
{
return jedis.del(key.getBytes())>0;
}
}
5 在controller中简单操作redis
@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,请访问getredis查询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,请访问getredis查询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 “删除成功，请通过getredis进行查询”;
}

@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,请访问getredis查询redis”;
}

@RequestMapping(value = “/getList”)
public Object getList(String keyredis){
Object object = redisService.get(keyredis);
if(object !=null){
List iqProducts = (List) 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;
}

}