Redis入门（二）——基本操作

Redis作为独立的服务端，在Java中去操作redis需要通过Redis提供的jar

z在这里特别申明，除了基本数据以及String外，其余对象，要想写入redis，必须序列化（即使是对象也要实现序列化接口），且读取redis中的数据也需要反序列化

不懂序列化的请自行百度

下面是Demo代码

Util类

package com.redis.test.util;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.redis.test.module.User;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

public class RedisTool {
    // Redis服务器地址
    private static String address = "127.0.0.1";
    // Redis服务器端口号
    private static int port = 6379;

    private static Jedis jedis;

    public static void main(String[] args) {
        RedisTool redisTool = new RedisTool();
        jedis = new Jedis(RedisTool.address, RedisTool.port);
        System.out.println("连接成功");
        redisTool.saveMap();
    }

    /**
     * 存储数组
     */
    public void saveList() {
        List<User> list = new ArrayList<User>();
        User user1 = new User();
        user1.setName("张三");
        user1.setPassword("123456");
        user1.setAddress("无锡市学前东路12号");
        user1.setAge(23);
        list.add(user1);

        User user2 = new User();
        user2.setName("李四");
        user2.setPassword("123456");
        user2.setAddress("无锡市仁爱路89号");
        user2.setAge(18);
        list.add(user2);

        jedis.set(("userList").getBytes(), SerializeUtil.serialize(list));
        byte[] userObjs = jedis.get(("userList").getBytes());
        List<Object> userList = (List<Object>) SerializeUtil.unserialize(userObjs);
        System.out.println(userList.size());
    }

    /**
     * 存储对象
     */
    public void saveObject() {

        User user = new User();
        user.setName("张三");
        user.setPassword("123456");
        user.setAddress("无锡市学前东路12号");
        user.setAge(23);
        jedis.set("user".getBytes(), SerializeUtil.serialize(user));
        System.out.println("Jedis中存储的字符串为：" + jedis.get("test"));
        byte[] userObj = jedis.get(("user").getBytes());
        user = (User) SerializeUtil.unserialize(userObj);
        System.out.println(user.toString());
    }

    /**
     * 存储Map
     */
    public void saveMap() {
        Map<String , String> map = new HashMap<String, String>();
        map.put("name", "你好");
        jedis.set("map".getBytes(), SerializeUtil.serialize(map));
        byte[] mapObj = jedis.get(("map").getBytes());
        Map newMap = (Map) SerializeUtil.unserialize(mapObj);
        System.out.println(newMap.get("name").toString());
    }
}

序列化工具类：

package com.redis.test.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.List;

public class SerializeUtil {
    public static byte[] serialize(Object object) {
        ObjectOutputStream oos = null;
        ByteArrayOutputStream baos = null;
        byte[] bytes = null;
        if(null!=object){
            try {
                baos = new ByteArrayOutputStream();
                oos = new ObjectOutputStream(baos);
                oos.writeObject(object);
                bytes = baos.toByteArray();
            } catch (Exception e) {
                    e.printStackTrace();
            }
        }
        return bytes;
    }

    public static Object unserialize(byte[] bytes) {
        ByteArrayInputStream bais = null;
        try {
            // 反序列化
            bais = new ByteArrayInputStream(bytes);
            ObjectInputStream ois = new ObjectInputStream(bais);
            return ois.readObject();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            close(bais);
        }
        return null;
    }

    /**
     * 列表序列化（用于Redis整存整取）
     * @param value
     * @return
     */
    public static <T> byte[] serializeList(List<T> value) {
        if (value == null) {
            throw new NullPointerException("Can't serialize null");
        }
        byte[] rv=null;
        ByteArrayOutputStream bos = null;
        ObjectOutputStream os = null;
        try {
            bos = new ByteArrayOutputStream();
            os = new ObjectOutputStream(bos);
            for(T obj : value){
                os.writeObject(obj);
            }
            os.writeObject(null);
            os.close();
            bos.close();
            rv = bos.toByteArray();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            close(os);
            close(bos);
        }
        return rv;
    }

    /**
     * 反序列化列表（用于Redis整存整取）
     * @param in
     * @return
     */
    public static <T> List<T> unserializeForList(byte[] in) {
        List<T> list = new ArrayList<T>();
        ByteArrayInputStream bis = null;
        ObjectInputStream is = null;
        try {
            if(in != null) {
                bis=new ByteArrayInputStream(in);
                is=new ObjectInputStream(bis);
                while (true) {
                    T obj = (T) is.readObject();
                    if(obj == null){
                        break;
                    }else{
                        list.add(obj);
                    }
                }
                is.close();
                bis.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } finally {
            close(is);
            close(bis);
        }
        return list;
    }

    /**
     * 关闭的数据源或目标。调用 close()方法可释放对象保存的资源（如打开文件）
     * 关闭此流并释放与此流关联的所有系统资源。如果已经关闭该流，则调用此方法无效。
     * @param closeable
     */
    public static void close(Closeable closeable) {
        if (closeable != null) {
            try {
                closeable.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

Module类

package com.redis.test.module;

import java.io.Serializable;

public class User implements Serializable{

    private String name;

    private String password;

    private String address;

    private Integer age;

    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;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String toString(){
        return "姓名："+this.getName()+";"+"年龄："+this.getAge()+";"+"地址："+this.getAddress()+";";
    }
}