redis实践

Redis是一个开源的使用ANSI C语言编写、支持网络、可基于内存亦可持久化的日志型、Key-Value数据库。

================

redis特点：

异常快速：Redis的速度非常快，每秒能执行约11万集合，每秒约81000+条记录。

支持丰富的数据类型：Redis支持最大多数开发人员已经知道像列表，集合，有序集合，散列数据类型。这使得它非常容易解决各种各样的问题，因为我们知道哪些问题是可以处理通过它的数据类型更好。

操作都是原子性：所有Redis操作是原子的，这保证了如果两个客户端同时访问的Redis服务器将获得更新后的值。

多功能实用工具：Redis是一个多实用的工具，可以在多个用例如缓存，消息，队列使用(Redis原生支持发布/订阅)，任何短暂的数据，应用程序，如Web应用程序会话，网页命中计数等。

redis的安装以及配置

1.到官网http://redis.io下载压缩文件并解压

2.cd到redis根目录 cd /usr/local/redis-3.0.2

3.在redis根目录编译源程序：make

启动服务以及客户端连接

1.启动服务：在reids根目录下输入 src/redis-server

2.客户端连接：在reids根目录下输入 src/redis-cli

redis数据类型

1.string

2.hash

3.列表（list）

4.集合（set）

5.有序集合（zset）

redis数据库基本操作

1、插入数据,设置一个key-value对。

set name zpeng

2、查询数据,取出key所对应的value。

get name

3、删除键值,删除这个key及对应的value。

del name

4、验证键是否存在 ,其中0，代表此key不存在;1代表存在。

exists name \

5、 设置密码

config set requirepass 123456

config get requirepass

auth 123456

使用spring-redis对 redis CRUD

参考blog： http://blog.csdn.net/java2000_wl/article/details/8543203/

watch out:showcase使用maven构建

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion>
<groupId>com.company.redis</groupId>
<artifactId>spring2redis</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-redis</artifactId>
<version>1.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>3.1.2.RELEASE</version>
<scope>test</scope>
</dependency>

<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.1.0</version>
</dependency>

<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>

AbstractBaseRedisDao.java

package com.company.dao;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.RedisSerializer;

/**
* AbstractBaseRedisDao
* @author http://blog.csdn.net/java2000_wl * @version <b>1.0</b>
*/
public abstract class AbstractBaseRedisDao<K, V> {

@Autowired
protected RedisTemplate<K, V> redisTemplate;

/**
* 设置redisTemplate
* @param redisTemplate the redisTemplate to set
*/
public void setRedisTemplate(RedisTemplate<K, V> redisTemplate) {
this.redisTemplate = redisTemplate;
}

/**
* 获取 RedisSerializer
* <br>------------------------------<br>
*/
protected RedisSerializer<String> getRedisSerializer() {
return redisTemplate.ge
4000
tStringSerializer();
}
}

IUserDao.java

package com.company.dao;

import java.util.List;

import com.company.entity.User;

/**
* @version <b>1.0</b>
*/
public interface IUserDao {

/**
* 新增
* <br>------------------------------<br>
* @param user
* @return
*/
boolean add(User user);

/**
* 批量新增 使用pipeline方式
* <br>------------------------------<br>
* @param list
* @return
*/
boolean add(List<User> list);

/**
* 删除
* <br>------------------------------<br>
* @param key
*/
void delete(String key);

/**
* 删除多个
* <br>------------------------------<br>
* @param keys
*/
void delete(List<String> keys);

/**
* 修改
* <br>------------------------------<br>
* @param user
* @return
*/
boolean update(User user);

/**
* 通过key获取
* <br>------------------------------<br>
* @param keyId
* @return
*/
User get(String keyId);
}

UserDao.java

package com.company.dao;

import java.util.ArrayList;
import java.util.List;

import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.util.Assert;

import com.company.dao.AbstractBaseRedisDao;
import com.company.dao.IUserDao;
import com.company.entity.User;

/**
* Dao
* @version <b>1.0</b>
*/
public class UserDao extends AbstractBaseRedisDao<String, User> implements IUserDao {

/**
* 新增
*<br>------------------------------<br>
* @param user
* @return
*/
public boolean add(final User user) {
boolean result = redisTemplate.execute(new RedisCallback<Boolean>() {
public Boolean doInRedis(RedisConnection connection) throws DataAccessException {
RedisSerializer<String> serializer = getRedisSerializer();
byte[] key  = serializer.serialize(user.getId());
byte[] name = serializer.serialize(user.getName());
return connection.setNX(key, name);
}
});
return result;
}

/**
* 批量新增 使用pipeline方式
*<br>------------------------------<br>
*@param list
*@return
*/
public boolean add(final List<User> list) {
Assert.notEmpty(list);
boolean result = redisTemplate.execute(new RedisCallback<Boolean>() {
public Boolean doInRedis(RedisConnection connection) throws DataAccessException {
RedisSerializer<String> serializer = getRedisSerializer();
for (User user : list) {
byte[] key  = serializer.serialize(user.getId());
byte[] name = serializer.serialize(user.getName());
connection.setNX(key, name);
}
return true;
}
}, false, true);
return result;
}

/**
* 删除
* <br>------------------------------<br>
* @param key
*/
public void delete(String key) {
List<String> list = new ArrayList<String>();
list.add(key);
delete(list);
}

/**
* 删除多个
* <br>------------------------------<br>
* @param keys
*/
public void delete(List<String> keys) {
redisTemplate.delete(keys);
}

/**
* 修改
* <br>------------------------------<br>
* @param user
* @return
*/
public boolean update(final User user) {
String key = user.getId();
if (get(key) == null) {
throw new NullPointerException("数据行不存在, key = " + key);
}
boolean result = redisTemplate.execute(new RedisCallback<Boolean>() {
public Boolean doInRedis(RedisConnection connection)
throws DataAccessException {
RedisSerializer<String> serializer = getRedisSerializer();
byte[] key  = serializer.serialize(user.getId());
byte[] name = serializer.serialize(user.getName());
connection.set(key, name);
return true;
}
});
return result;
}

/**
* 通过key获取
* <br>------------------------------<br>
* @param keyId
* @return
*/
public User get(final String keyId) {
User result = redisTemplate.execute(new RedisCallback<User>() {
public User doInRedis(RedisConnection connection) throws DataAccessException {
RedisSerializer<String> serializer = getRedisSerializer();
byte[] key = serializer.serialize(keyId);
byte[] value = connection.get(key);
if (value == null) {
return null;
}
String name = serializer.deserialize(value);
return new User(keyId, name, null);
}
});
return result;
}
}

User.java

package com.company.entity;

import java.io.Serializable;

public class User implements Serializable {

private static final long serialVersionUID = -6011241820070393952L;

private String id;

private String name;

private String password;

/**
* <br>------------------------------<br>
*/
public User() {

}

/**
* <br>------------------------------<br>
*/
public User(String id, String name, String password) {
super();
this.id = id;
this.name = name;
this.password = password;
}

/**
* 获得id
* @return the id
*/
public String getId() {
return id;
}

/**
* 设置id
* @param id the id to set
*/
public void setId(String id) {
this.id = id;
}

/**
* 获得name
* @return the name
*/
public String getName() {
return name;
}

/**
* 设置name
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}

/**
* 获得password
* @return the password
*/
public String getPassword() {
return password;
}

/**
* 设置password
* @param password the password to set
*/
public void setPassword(String password) {
this.password = password;
}

@Override
public String toString() {
return this.id + "+" + this.name + "+" + this.password;
}
}

Spring2RedisTest.java

package com.company.test;

import java.util.ArrayList;
import java.util.List;

import junit.framework.Assert;

import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.AbstractJUnit4SpringContextTests;

import com.company.dao.IUserDao;
import com.company.entity.User;

/**
* 测试
* @author http://blog.csdn.net/java2000_wl * @version <b>1.0</b>
*/
@ContextConfiguration(locations = {"classpath*:applicationContext.xml"})
public class Spring2RedisTest extends AbstractJUnit4SpringContextTests {
@Autowired
private IUserDao userDao;

/**
* 新增
* <br>------------------------------<br>
*/
@Test
public void testAddUser() {
User user = new User();
user.setId("user2");
user.setName("123456");
user.setPassword("520loveu");
boolean result = userDao.add(user);
Assert.assertTrue(result);
}

/**
* 批量新增 普通方式
* <br>------------------------------<br>
*/
@Test
public void testAddUsers1() {
List<User> list = new ArrayList<User>();
for (int i = 10; i < 50000; i++) {
User user = new User();
user.setId("user" + i);
user.setName("java2000_wl" + i);
bceb

list.add(user);
}
long begin = System.currentTimeMillis();
for (User user : list) {
userDao.add(user);
}
System.out.println(System.currentTimeMillis() -  begin);
}

/**
* 批量新增 pipeline方式
* <br>------------------------------<br>
*/
@Test
public void testAddUsers2() {
List<User> list = new ArrayList<User>();
for (int i = 10; i < 1500000; i++) {
User user = new User();
user.setId("user" + i);
user.setName("java2000_wl" + i);
list.add(user);
}
long begin = System.currentTimeMillis();
boolean result = userDao.add(list);
System.out.println(System.currentTimeMillis() - begin);
Assert.assertTrue(result);
}

/**
* 修改
* <br>------------------------------<br>
*/
@Test
public void testUpdate() {
User user = new User();
user.setId("user1");
user.setName("new_password");
boolean result = userDao.update(user);
Assert.assertTrue(result);
}

/**
* 通过key删除单个
* <br>------------------------------<br>
*/
@Test
public void testDelete() {
String key = "user1";
userDao.delete(key);
}

/**
* 批量删除
* <br>------------------------------<br>
*/
@Test
public void testDeletes() {
List<String> list = new ArrayList<String>();
for (int i = 0; i < 10; i++) {
list.add("user" + i);
}
userDao.delete(list);
}

/**
* 获取
* <br>------------------------------<br>
*/
@Test
public void testGetUser() {
String id = "user2";
User user = userDao.get(id);
System.out.println(user);
Assert.assertNotNull(user);
Assert.assertEquals(user.getName(), "123456");
}

/**
* 设置userDao
* @param userDao the userDao to set
*/
public void setUserDao(IUserDao userDao) {
this.userDao = userDao;
}
}