Redis客戶端操作之Jedis
阿新 • • 發佈:2019-05-09
Jedis
Jedis Client是Redis官網推薦的一個面向java客戶端,庫檔案實現了對redis各類API進行封裝呼叫,通過這些API我們會非常方便的操作我們的Redis資料庫。
redis配置檔案地修改
1.註釋掉繫結地資訊
在redis.conf的配置檔案中bind配置的資訊表示的是redis服務可以接收外部訪問的地址,這個主要還是為了提高安全性,我們在學習階段可以將這個資訊直接註釋掉,這樣的話任意的外部ip地址都可以訪問。bind是protected-mode配合使用的
bind 127.0.0.1
2.關閉保護模式
redis3.2版本後新增protected-mode配置,預設是yes,即開啟。設定外部網路連線redis服務,設定方式如下: 1、關閉protected-mode模式,此時外部網路可以直接訪問 2、開啟protected-mode保護模式,需配置bind ip或者設定訪問密碼
建立專案
新增依賴
<dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.9.0</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> </dependency>
redis單機版
案例程式碼:
/** * 測試是否連線成功 */ public void ping(){ Jedis jedis = new Jedis("192.168.119.12", 6379); System.out.println(jedis.ping()); } /** * 設定key/value對 */ public void set(){ Jedis jedis = new Jedis("192.168.119.12", 6379); jedis.set("name", "張三"); jedis.set("age", "18"); jedis.close(); } /** * 通過key獲取對應的value */ public void get(){ Jedis jedis = new Jedis("192.168.119.12", 6379); String name = jedis.get("name"); String age = jedis.get("age"); System.out.println(name+"--"+age); jedis.close(); } /** * 通過Jedis的連線池Pool */ public void testJedisPool() { // 建立Jedis連線池 JedisPool pool = new JedisPool("192.168.119.12", 6379); // 從連線池中獲取Jedis物件 Jedis jedisItem = pool.getResource(); String name = jedisItem.get("name"); System.out.println(name); jedisItem.close(); pool.close(); } /** * 操作incr方法自增1 */ public void incr(){ Jedis jedis = new Jedis("192.168.119.12", 6379); Long age = jedis.incr("age"); System.out.println(age); }
redis資料 控制檯輸出
Jedis整合Spring
新增依賴
<dependencies>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.9.0</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.3.RELEASE</version>
</dependency>
</dependencies>
Redis單機環境【Spring地配置檔案】
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
<context:component-scan base-package="com.sxt.dao.impl"></context:component-scan>
<!-- 連線池配置 -->
<bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
<!-- 最大連線數 -->
<property name="maxTotal" value="30" />
<!-- 最大空閒連線數 -->
<property name="maxIdle" value="10" />
<!-- 每次釋放連線的最大數目 -->
<property name="numTestsPerEvictionRun" value="1024" />
<!-- 釋放連線的掃描間隔(毫秒) -->
<property name="timeBetweenEvictionRunsMillis" value="30000" />
<!-- 連線最小空閒時間 -->
<property name="minEvictableIdleTimeMillis" value="1800000" />
<!-- 連線空閒多久後釋放, 當空閒時間>該值 且 空閒連線>最大空閒連線數 時直接釋放 -->
<property name="softMinEvictableIdleTimeMillis" value="10000" />
<!-- 獲取連線時的最大等待毫秒數,小於零:阻塞不確定的時間,預設-1 -->
<property name="maxWaitMillis" value="1500" />
<!-- 在獲取連線的時候檢查有效性, 預設false -->
<property name="testOnBorrow" value="false" />
<!-- 在空閒時檢查有效性, 預設false -->
<property name="testWhileIdle" value="false" />
<!-- 連線耗盡時是否阻塞, false報異常,ture阻塞直到超時, 預設true -->
<property name="blockWhenExhausted" value="false" />
</bean>
<!-- jedis客戶端單機版 -->
<bean id="redisClient" class="redis.clients.jedis.JedisPool">
<constructor-arg name="host" value="192.168.119.12"></constructor-arg>
<constructor-arg name="port" value="6379"></constructor-arg>
<constructor-arg name="poolConfig" ref="jedisPoolConfig"></constructor-arg>
</bean>
</beans>
定義user物件
package com.sxt.bean;
public class User {
private Integer id;
private String username;
private String password;
@Override
public String toString() {
return "User [id=" + id + ", username=" + username + ", password=" + password + "]";
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
定義介面和實現類
dao層
package com.sxt.dao;
import java.util.List;
import com.sxt.bean.User;
public interface UserDao {
//查詢方法
public List<User> query(User user);
//新增方法
public int add(User user);
//刪除方法·
public int delete(Integer id);
//更新資料
public int update(Integer id);
}
dao層實現類
package com.sxt.dao.impl;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.annotation.Resource;
import org.springframework.stereotype.Service;
import com.sxt.bean.User;
import com.sxt.dao.UserDao;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
@Service
public class UserDaoImpl implements UserDao{
@Resource
private JedisPool jedis1;
private Jedis jedis;
@Override
public List<User> query(User user) {
jedis = jedis1.getResource();//從連線池獲取jedis物件
Set<String> set = jedis.keys("user:*");
List<User> list= new ArrayList<>();
for (String key : set) {
User user2 = new User();
String hget = jedis.hget(key, "id");
String hget2 = jedis.hget(key,"username");
String hget3 = jedis.hget(key,"password");
user2.setId(Integer.parseInt(hget));
user2.setUsername(hget2);
user2.setPassword(hget3);
list.add(user2);
}
return list;
}
@Override
public int add(User user) {
jedis = jedis1.getResource();
jedis.hset("user:"+user.getId(), "username", user.getUsername());
jedis.hset("user:"+user.getId(), "id",user.getId()+"");
jedis.hset("user:"+user.getId(), "password", user.getPassword());
return 0;
}
@Override
public int delete(Integer id) {
jedis = jedis1.getResource();
jedis.del("user:"+id);
return 0;
}
@Override
public int update(Integer id) {
jedis = jedis1.getResource();
Map<String,String> map = new HashMap<>();
map.put("username", "zhangsan");
map.put("id", 1+"");
map.put("password", "321");
jedis.hmset("user:"+id, map);
return 0;
}
}
測試
package com.sxt;
import java.util.List;
import org.junit.Before;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.sxt.bean.User;
import com.sxt.dao.UserDao;
public class Test {
private UserDao dao;
@org.junit.Test
@Before
public void test() {
ApplicationContext ac = new ClassPathXmlApplicationContext("application.xml");
dao = ac.getBean(UserDao.class);
}
//查詢
@org.junit.Test
public void test1(){
User user = new User();
List<User> list = dao.query(user);
System.out.println(list);
}
//新增
@org.junit.Test
public void test2(){
User user = new User();
user.setId(2);
user.setUsername("lisi");
user.setPassword("321");
dao.add(user);
}
//刪除
@org.junit.Test
public void test3(){
dao.delete(2);
}
//更新
@org.junit.Test
public void test4(){
dao.update(1);
}
}
效果截圖從上到下
這樣redis