前言
大家都知道在项目中,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。下面话不多说了,来一起看看详细的介绍吧。
1.在启动类上加入如下代码
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private Jedis jedis; private JedisPoolConfig config; private JedisShardInfo sharInfo; @Beanpublic 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;
}
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2.在application.yml当中加入redis配置
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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)
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3.新建SerializeUtil类,这个类主要是为了将对象序列化redis当中
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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 ;
}
}
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4.我封装了一个RedisServiceImpl类,主要是用对redis设值和取值
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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 ;
}
}
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5.测试redis是否ok,编写redisController类
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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;
}
}
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6.测试结果
总结
以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作具有一定的参考学习价值,如果有疑问大家可以留言交流,谢谢大家对服务器之家的支持。