SSM框架集成Redis

SSM-Spring+SpringMVC+Mybatis框架相信你們都很熟悉了,可是有的時候須要頻繁訪問數據庫中不變或者不常常改變的數據,就會加劇數據庫的負擔,這時咱們就會想起Redishtml

Redis是由C語言編寫,高性能的key-value存儲系統,經常使用於緩存不常常變更或者根本不變的數據,Redis高級:http://www.javashuo.com/article/p-ylmgjcna-bq.htmljava

廢話很少說,先練練手再說git

安裝Redisgithub

這裏介紹的window下的安裝redis

一、下載spring

下載地址:https://github.com/MSOpenTech/redis/releases
數據庫

下載適合本身系統的zip包,而後解壓到想放的地方,我這裏直接放在E盤下apache

Win+R輸入cmd 進入E盤,Redis下,哎呀廢話很少說了,直接傳送http://www.runoob.com/redis/redis-install.htmlwindows

 

二、安裝+配置緩存

若是每次啓動都像上面那樣未免太麻煩了,因此咱們接下來把它作成服務,這樣啓動就方便多了。

cmd到redis.windows-service.conf所在目錄,執行

 redis-server --service-install redis-windows-conf

就能夠了,接下來咱們就能夠在Windows任務管理器服務裏面找到Redis了,能夠右鍵啓動,也能夠

cmd 下輸入redis-server --service-start啓動

 

接下來配置redis.windows-service.conf,爲何不修改redis.windows.conf呢?

由於Redis服務默認加載的redis.windows-service.conf配置文件

配置文件裏面對於初級者須要修改的很少,

1、Redis默認不是以守護進程的方式運行,能夠經過該配置項修改,使用yes啓用守護進程

    daemonize no

2、當Redis以守護進程方式運行時,Redis默認會把pid寫入/var/run/redis.pid文件,能夠經過pidfile指定

    pidfile /var/run/redis.pid
3、設置Redis鏈接密碼,若是配置了鏈接密碼,客戶端在鏈接Redis時須要經過AUTH <password>命令提供密碼,默認關閉

    requirepass foobared

更多配置詳見http://www.runoob.com/redis/redis-conf.html

SSM集成Redis

終於到這一步了,廢話很少說

首先固然是添加依賴

 

  <spring.redis.version>1.6.0.RELEASE</spring.redis.version>
    <jedis.version>2.7.2</jedis.version>

<!-- config redis data and client jar-->
    <dependency>
      <groupId>org.springframework.data</groupId>
      <artifactId>spring-data-redis</artifactId>
      <version>${spring.redis.version}</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-pool2 -->
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-pool2</artifactId>
      <version>${commons.version}</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
    <dependency>
      <groupId>redis.clients</groupId>
      <artifactId>jedis</artifactId>
      <version>${jedis.version}</version>
    </dependency>

 

 

 

resources目錄下新建redis.properties

 

redis.host=127.0.0.1
redis.port=6379
redis.password=960521

redis.maxIdle=300
redis.maxWaitMillis=1000
redis.maxTotal=600
redis.testOnBorrow=true
redis.testOnReturn=true
redis.testWhileIdle=true
redis.blockWhenExhausted=false
redis.numTestsPerEvictionRun=1024
redis.timeBetweenEvictionRunsMillis=30000
redis.minEvictableIdleTimeMillis=1800000

 

而後Spring整合Redis,我配置在Spring-Mybatis.xml

<!--掃描redis配置文件-->
    <context:property-placeholder ignore-unresolvable="true" location="classpath:redis.properties"/>
 <!--Spring整合Redis-->
    <!--設置鏈接池-->
    <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <!-- 最大空閒鏈接數 -->
        <property name="maxIdle" value="${redis.maxIdle}"/>
        <!-- 最大鏈接數 -->
        <property name="maxTotal" value="${redis.maxTotal}" />
        <!-- 每次釋放鏈接的最大數目 -->
        <property name="numTestsPerEvictionRun" value="${redis.numTestsPerEvictionRun}" />
        <!-- 釋放鏈接的掃描間隔(毫秒) -->
        <property name="timeBetweenEvictionRunsMillis" value="${redis.timeBetweenEvictionRunsMillis}" />
        <!-- 鏈接最小空閒時間 -->
        <property name="minEvictableIdleTimeMillis" value="${redis.minEvictableIdleTimeMillis}" />
        <!-- 獲取鏈接時的最大等待毫秒數,小於零:阻塞不肯定的時間,默認-1 -->
        <property name="maxWaitMillis" value="${redis.maxWaitMillis}" />
        <!-- 在獲取鏈接的時候檢查有效性, 默認false -->
        <property name="testOnBorrow" value="${redis.testOnBorrow}" />
        <property name="testOnReturn" value="${redis.testOnReturn}" />
        <!-- 在空閒時檢查有效性, 默認false -->
        <property name="testWhileIdle" value="${redis.testWhileIdle}" />
        <!-- 鏈接耗盡時是否阻塞, false報異常,ture阻塞直到超時, 默認true -->
        <property name="blockWhenExhausted" value="${redis.blockWhenExhausted}" />
    </bean>

    <!-- jedis客戶端單機版 -->
    <bean id="redisClient" class="redis.clients.jedis.JedisPool">
        <constructor-arg name="host" value="${redis.host}"></constructor-arg>
        <constructor-arg name="port" value="${redis.port}"></constructor-arg>
        <constructor-arg name="password" value="${redis.password}"></constructor-arg>
        <constructor-arg name="poolConfig" ref="poolConfig"></constructor-arg>
        <constructor-arg name="timeout" value="100000"></constructor-arg>
    </bean>
    <bean id="JedisClient" class="com.smart.redis.JedisClientSingle"/>

首先建立一個接口,下面不少方法都用不到,標紅的是我常常用的

import java.io.File;
import java.util.List;

public interface JedisClient {
    String get(String key);
    String set(String key,String value);
    public void setList(String key,List<?> value);
    public List<?> getList(String key);
    public void setObject(String key,Object o);
    public Object getObject(String key);
    public void clear();
    public Object removeObject(String str);
    public int getSize();
    public void setFile(String key,String path);
    public File getFile(String key);


    String hashGet(String key,String value);//獲取存儲結構爲hashMap的類型數據
    long hset(String hkey,String key, String value);
    long incr(String key);
    long expire(String key,int second);
    long tt1(String key);
    long del(String key);//刪除數據
    long hashDel(String hkey,String key);
}

而後實現類

import org.springframework.beans.factory.annotation.Autowired;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

import java.io.File;
import java.util.List;

public class JedisClientSingle implements JedisClient {

    @Autowired
    private JedisPool jedisPool;

    @Override
    public String get(String key) {
        Jedis jedis = jedisPool.getResource();
        String str = jedis.get(key);
        jedis.close();
        return str;
    }

    @Override
    public String set(String key, String value) {
        Jedis jedis = jedisPool.getResource();
        String str = jedis.set(key,value);
        jedis.close();
        return str;
    }

    @Override
    public long hset(String hkey, String key, String value) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.hset(hkey,key,value);
        jedis.close();
        return result;
    }

    @Override
    public String hashGet(String key, String value) {
        Jedis jedis = jedisPool.getResource();
        String str = jedis.hget(key,value);
        jedis.close();
        return str;
    }

    @Override
    public long hashDel(String hkey, String key) {
        return 0;
    }

    @Override
    public long tt1(String key) {
        return 0;
    }

    @Override
    public long expire(String key, int second) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.expire(key,second);
        jedis.close();
        return result;
    }

    @Override
    public long incr(String key) {
        return 0;
    }

    @Override
    public long del(String key) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.del(key);
        jedis.close();
        return result;
    }

    @Override
    public void setList(String key, List<?> list) {
        Jedis jedis = jedisPool.getResource();
        try{
            if(list != null && !list.isEmpty()){
                jedis.set(key.getBytes(),SerializeUtil.serializeList(list));
            }else{
                jedis.set(key.getBytes(), "".getBytes());
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    @Override
    public List<?> getList(String key) {
        Jedis jedis = jedisPool.getResource();
        if(jedis==null || !jedis.exists(key)){
            return null;
        }
        byte[] data = jedis.get(key.getBytes());
        return SerializeUtil.unSerializeList(data);
    }

    @Override
    public void setObject(String key, Object o) {
        Jedis jedis = jedisPool.getResource();
        try{
            o = o == null ? new Object():o;
            jedis.set(key.getBytes(),SerializeUtil.serializeObject(o));
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    @Override
    public Object getObject(String key) {
        Jedis jedis = jedisPool.getResource();
        if(jedis == null || !jedis.exists(key)){
            return null;
        }
        byte[] data = jedis.get(key.getBytes());
        return (Object)SerializeUtil.unSerializeObject(data);
    }

    @Override
    public void clear() {
        Jedis jedis = jedisPool.getResource();
        jedis.flushDB();
    }

    @Override
    public Object removeObject(String key) {
        return jedisPool.getResource().expire(SerializeUtil.serializeObject(key), 0);
    }

    @Override
    public int getSize() {
        return Integer.valueOf(jedisPool.getResource().dbSize().toString());
    }

    //保存文件方法
    public void setFile(String key,String path){
        Jedis jedis = jedisPool.getResource();
        File fr = new File(path);
        try{
            jedis.set(key.getBytes(), SerializeUtil.serializeObject(fr));
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    //讀取文件對象方法
    public File getFile(String key){
        Jedis jedis = jedisPool.getResource();
        File file = (File)SerializeUtil.unSerializeObject(jedis.get(key.getBytes()));
        return file;
    }
}
View Code

因爲Redis只能存儲5種類的數據,包括String、List、Set、zset和hash,其餘的類型則須要序列化以後方可存儲

下面這是序列化工具類

import java.io.*;
import java.util.ArrayList;
import java.util.List;

public class SerializeUtil {
    /**
     *
     * 序列化對象
     */
    public static byte[] serializeObject(Object obj) {
        if(obj == null){
            return null;
        }
        ObjectOutputStream oos = null;
        ByteArrayOutputStream baos = null;
        byte[] bytes = null;
        try {
            // 序列化
            baos = new ByteArrayOutputStream();
            oos = new ObjectOutputStream(baos);
            oos.writeObject(obj);
            bytes = baos.toByteArray();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            close(oos);
            close(baos);
        }
        return bytes;
    }

    /**
     *
     * 反序列化
     *
     * @param bytes
     * @return
     */
    public static Object unSerializeObject(byte[] bytes) {
        if(bytes == null){
            return null;
        }
        ByteArrayInputStream bais = null;
        ObjectInputStream ois = null;
        try {
            // 反序列化爲對象
            bais = new ByteArrayInputStream(bytes);
            ois = new ObjectInputStream(bais);
            return ois.readObject();
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            close(bais);
            close(ois);
        }
        return null;
    }

    /**
     *
     * 序列化
     */
    public static byte[] serializeList(List<?> list) {
        if(list==null || list.isEmpty()){
            return null;
        }
        ObjectOutputStream oos = null;
        ByteArrayOutputStream baos = null;
        byte[] bytes = null;
        try {
            // 序列化
            baos = new ByteArrayOutputStream();
            oos = new ObjectOutputStream(baos);
            for(Object o : list){
                oos.writeObject(o);
            }
            bytes = baos.toByteArray();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            close(oos);
            close(baos);
        }
        return bytes;
    }

    /**
     *
     * 反序列化
     *
     * @param bytes
     * @return
     */
    public static List<?> unSerializeList(byte[] bytes) {
        if(bytes == null){
            return null;
        }
        List<Object> list = new ArrayList<Object>();
        ByteArrayInputStream bais = null;
        ObjectInputStream ois = null;
        try {
            // 反序列化爲對象
            bais = new ByteArrayInputStream(bytes);
            ois = new ObjectInputStream(bais);
            while (bais.available()>0){
                Object o = (Object)ois.readObject();
                if(o == null){
                    break;
                }
                list.add(o);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            close(bais);
            close(ois);
        }
        return list;
    }

    //關閉IO流對象
    public static void close(Closeable closeable){
        if(closeable != null){
            try{
                closeable.close();
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }



}
View Code

至此咱們就整合好了,下面測試一下

@Service("userService")
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;
//注入
    @Autowired
    com.smart.redis.JedisClient JedisClient;

 //判斷工號是否已存在
    public boolean isNumberExist(String geNumber){
        boolean isSuccess = false;
        User user = null;
//先從Redis裏取
        user = (User)JedisClient.getObject(geNumber);
        if(user==null){
//若是Redis沒有則從數據庫裏取
            user = userDao.getUserById(geNumber);
            if(user!=null){
//從數據庫中取了以後,再存入Redis,以便下次取
                JedisClient.setObject(geNumber,(Object) user);
            }
        }

        if(StringUtils.isEmpty(user)){
            isSuccess = true;
        }
        return isSuccess;
    }
}
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