Shulou(Shulou.com)06/03 Report--

Recently, I used redis cache in my work, so I share something I summarized. This article uses StringRedisTemplate to learn. The value here is: (1) when StringRedisTemplate carries out batch delete operation, we need to serialize the template. (2) the update operation is the same as the add operation. The following code:

1. Set up a Spring boot project and introduce Redis dependencies (pom.xml as follows):

4.0.0 com.test redis 0.0.1-SNAPSHOT jar redis Demo project for Spring Boot org.springframework.boot spring-boot-starter-parent 2.1.0.RELEASE UTF-8 UTF-8 1.8 org.springframework.boot spring-boot-starter-data-redis Org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-test org.springframework.boot spring-boot-maven-plugin

two。 Write the spring boot configuration file. The content of my configuration here is simple. If you need other configurations, you can check it on the official website.

# Redis spring.redis.host= Host address spring.redis.password=adminspring.redis.port=6379server.port=8081

3. Next, we start to write tests.

(1) create an entity class:

User:

Package com.test.redis.entity;public class User {private Integer id; private String name; private String password; public User () {super ();} public User (Integer id, String name, String password) {super (); this.id = id; this.name = name; this.password = password;} public Integer getId () {return id } public void setId (Integer id) {this.id = id;} public String getName () {return name;} public void setName (String name) {this.name = name;} public String getPassword () {return password;} public void setPassword (String password) {this.password = password @ Override public String toString () {return "User [id=" + id + ", name=" + name + ", password=" + password + "]";}}

(2) service layer, which mainly defines various operation methods of redis.

RedisService:

Package com.test.redis.service;import java.util.List;import java.util.Map;import javax.annotation.Resource;import org.springframework.data.redis.core.HashOperations;import org.springframework.data.redis.core.StringRedisTemplate;import org.springframework.data.redis.serializer.JdkSerializationRedisSerializer;import org.springframework.stereotype.Service;@Servicepublic class RedisService {@ Resource private StringRedisTemplate template / * storing or modifying data * * @ param modelMap * @ param mapName * / public void setKey (String mapName, Map modelMap) {HashOperations hps = template.opsForHash (); hps.putAll (mapName, modelMap) } / * get data Map * * @ param mapName * @ return * / public Map getMapValue (String mapName) {HashOperations hps = this.template.opsForHash (); return hps.entries (mapName) } / * get data value * * @ param mapName * @ param hashKey * @ return * / public Object getValue (String mapName, String hashKey) {HashOperations hps = this.template.opsForHash (); return hps.get (mapName, hashKey) } / * bulk delete cache data * * @ param keys * / public void deleteData (List keys) {/ / serialize template template.setKeySerializer (new JdkSerializationRedisSerializer ()); template.delete (keys);}} when performing bulk delete operation

(3) controller layer code to demonstrate operation (add and get values):

Package com.test.redis.web;import java.util.HashMap;import java.util.Map;import javax.servlet.http.HttpServletRequest;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.ResponseBody;import com.test.redis.entity.User;import com.test.redis.service.RedisService;@Controllerpublic class UserController {private static final String mapName= "mapName"; @ Autowired private RedisService redisService @ GetMapping ("/ add.do") @ ResponseBody public Map addUser (HttpServletRequest request) {Map modelMap=new HashMap (); User user=new User (); user.setName ("hehename"); user.setPassword ("hehePassword"); / / store hash value modelMap.put ("name", user.getName ()); modelMap.put ("password", user.getPassword ()) RedisService.setKey (mapName, modelMap); / / get map collection Map modelMap1= redisService.getMapValue (mapName); Object value= redisService.getValue (mapName, "name"); System.out.println ("value:" + value); modelMap1.put ("value fetched from cache based on key", value); return modelMap1;}}

The front desk shows the results:

(4) delete and obtain values:

@ GetMapping ("/ delete.do") @ ResponseBody public Map deleteUser (HttpServletRequest request) {/ / get the key value to be deleted. Here we delete List keys=new ArrayList (); keys.add ("heheanme"); / / start the delete operation redisService.deleteData (keys); / / get the map collection Map modelMap1= redisService.getMapValue (mapName) Object value= redisService.getValue (mapName, "name"); System.out.println ("value:" + value); modelMap1.put ("value fetched from the cache based on key", value); return modelMap1;}

The front desk displays the results:

This shows that the operation is successful.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.