One of the project optimization: the installation and use of redis cache database in the project, and strengthen the project reading operation

One 、redis brief introduction

redis It's a key-value The storage system . and Memcached similar , It supports storage value There are more types , Include string( character string )、list( Linked list )、set( aggregate )、zset(sorted set -- Ordered set ) and hash（ Hash type ）. These data types support push/pop、add/remove And take intersection, union and difference sets and more abundant operations , And these operations are atomic . On this basis ,redis Support various sorts of sorting . And memcached equally , To ensure efficiency , The data is cached in memory . The difference is redis Periodically, updated data is written to disk or changes are written to an appended log file , And on this basis to achieve master-slave( Master-slave ) Sync .
Redis Is a high-performance key-value database . redis Appearance , A lot of compensation memcached This kind of key/value Insufficient storage , In the department The situation can be a good complement to the relational database . It provides Java,C/C++,C#,PHP,JavaScript,Perl,Object-C,Python,Ruby,Erlang Such as the client , Easy to use
Redis Support master-slave synchronization . Data can be synchronized from the master server to any number of slaves , A slave server can be the master server associated with other slaves . This makes Redis Single-layer tree replication can be performed . The disk can write to the data intentionally or unintentionally . Due to the full implementation of the release / Subscribe mechanism , Enables trees to be synchronized anywhere from the database , Subscribe to a channel and receive a complete record of message publication from the master server . Synchronization helps with scalability and data redundancy for read operations .

1.1 install redis

Jump to download address
After entering , You will see the following pictures , It is not recommended to download the pre release version , There will be many problems , Including the ones you installed before maven The latest version also has many problems , therefore , Installing the version is important , With 3.0.504 For example

Unpack after installation , After finishing the above operation , use cmd Open the extracted location , Enter the command ：
redis-server.exe redis.windows.conf, You will see the following

After this operation , Don't close this window , Continue to open new cmd Window page . Switch to redis Under the installation directory . Enter the command
redis-cli.exe -h 127.0.0.1 -p 6379
The stored key value pairs are shown in the figure below ：

And then modify redis Configuration file for , Input ：config get * View all configurations

Two 、 stay Java Project use redis

After the above operations are completed , stay java Yes, you can redis It's like a fish in water , With maven Project as an example , First, go to the central warehouse to download jedis Related dependence of ：

Click to enter , Here we need to pay attention to , To be on the safe side, I suggest you go to the one with a large number of downloads , Prevent other problems ：

Then use in the project ：

You can see that the value is saved successfully ,dedis.ping Used to check the status , Of course, there are other 3 Storage of data types in , If there is time , Update the blog later .
thus , Configuration and use complete , If you don't understand, you can comment on it below and we can discuss it together .