在项目中,缓存以及mq消息队列可以说是不可或缺的2个重要技术。前者主要是为了减轻数据库压力，大幅度提升性能。后者主要是为了提高用户的体验度，我理解的是再后端做的一个ajax请求(异步),并且像ribbmitmq等消息队列有重试机制等功能。
这里主要讲redis如何把对象，集合存入，并且取出.
1.在启动类上加入如下代码
private Jedis jedis;
private JedisPoolConfig config;
private JedisShardInfo sharInfo;
@Bean
public Jedis jedis(){
//连接redis服务器，192.168.0.100:6379
// jedis = new Jedis("192.168.0.100", 6379);
// //权限认证
// jedis.auth("123456");
// 操作单独的文本串
config = new JedisPoolConfig();
config.setMaxIdle(1000);//最大空闲时间
config.setMaxWaitMillis(1000); //最大等待时间
config.setMaxTotal(500); //redis池中最大对象个数
sharInfo = new JedisShardInfo("192.168.0.100", 6379);
sharInfo.setPassword("123456");
sharInfo.setConnectionTimeout(5000);//链接超时时间
jedis = new Jedis(sharInfo);
return jedis;
}
2.在application.yml当中加入redis配置
spring:
redis:
database: 0
host: 101.132.191.77
port: 6379
password: 123456
pool:
max-idle: 8 #连接池最大连接数（使用负值表示没有限制）
min-idle: 0 # 连接池中的最小空闲连接
max-active: 8 # 连接池最大阻塞等待时间（使用负值表示没有限制）
max-wait: -1 # 连接池中的最大空闲连接
timeout: 5000 # 连接超时时间（毫秒）
3..新建SerializeUtil类，这个类主要是为了将对象序列化redis当中
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
/**
* @author Administrator
*
*/
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.测试redis是否ok，编写redisController类
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,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<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.测试结果
image.png
7.参考文章
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