java操作redis数据库实例（redis集群）

1、配置redis集群

<?xml version="1.0" encoding="UTF-8"?>
<redisCluster>
<!--userRoute -->
<clusterGroup name="userRoute" selectdb="1">
<server host="10.177.129.16" port="6379"></server>
<server host="10.177.129.15" port="6379"></server>
</clusterGroup>
<!--sessionRoute -->
<clusterGroup name="sessionRoute" selectdb="2">
<server host="10.177.129.16" port="6379"></server>
<server host="10.177.129.15" port="6379"></server>
</clusterGroup>
<!--publicData -->
<clusterGroup name="publicData">
<server host="10.177.129.16" port="6379"></server>
<server host="10.177.129.15" port="6379"></server>
</clusterGroup>
</redisCluster>

2、创建redis连接属性实体类

package com.isoftstone.cms.syscore.pojo;

/**
* redis连接属性
* @author xiakai
*
*/
public class RedisCluster
{
private String selectdb;
private String hostIp;
private String	port;

public String getSelectdb() {
return selectdb;
}
public void setSelectdb(String selectdb) {
this.selectdb = selectdb;
}
public String getHostIp() {
return hostIp;
}
public void setHostIp(String hostIp) {
this.hostIp = hostIp;
}
public String getPort() {
return port;
}
public void setPort(String port) {
this.port = port;
}

}

3、解析redis集群配置

package com.iss.itreasury.test.jedis;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.EncodedResource;

/**
* 解析redis集群配置
* @author xiakai
*
*/
public class RedisConfig {

public static Map<String,List<RedisCluster>> redisGroupMap = null;

//有参构造函数
public RedisConfig()
{

}

//获取所有clusterGroup组的键值对
public static Map<String,List<RedisCluster>> getRedisGroupMap(){
//读取xml文件
Document document=readXmlFile();
//获得clusterGroup节点的key 和 list
if(redisGroupMap == null)
{
redisGroupMap=getMapByItemsGroup(document);
}

return redisGroupMap;
}

//读取redisConfig配置文件
private static Document readXmlFile(){
//创建读入对象
SAXReader reader = new SAXReader();
//创建document实例
Document doc=null;
try {
//从类路径下加载文件redisConfig.xml
Resource resource = new ClassPathResource("redisClusterConfig.xml");
//指定文件资源对应的编码格式（UTF-8),这样才能正确读取文件的内容，而不会出现乱码
EncodedResource encodeResource = new EncodedResource(resource,"UTF-8");
doc = reader.read(encodeResource.getReader());
}
catch (IOException e) {
System.out.println("无法读取系统配置文件redisConfig.xml,可能该文件不存在");

} catch (DocumentException e) {
System.out.println("解析redisConfig.xml文件出现异常");

}
return doc;

}

//读取xml节点,返回节点为redisGroup的Map
private  static Map<String,List<RedisCluster>> getMapByItemsGroup(Document document){
Map<String,List<RedisCluster>> itemmap=new HashMap<String,List<RedisCluster>>();
try{
//获得根节点
Element root=document.getRootElement();
//获得根节点下所有子节点clusterGroup的list
List itemsList=root.selectNodes("./clusterGroup");
for(int i=0;i<itemsList.size();i++){
//获得节点Items
Element items=(Element)itemsList.get(i);
String groupName=items.attribute("name").getText();
String selectdb = items.attribute("selectdb")==null?"":items.attribute("selectdb").getText();
//		if(groupName!=null&&groupName.equals(this.getGroupName())){
//获得clusterGroup下所有子节点service的list
List itemList=items.elements();
//获得service节点的值
List<RedisCluster> redisClusterList = getItemList(itemList,selectdb);

itemmap.put(groupName, redisClusterList);
//		}

}
}
catch(Exception e){

}
return itemmap;
}

//获得所有Item下节点的redis服务节点
private static List<RedisCluster> getItemList(List itemList,String selectdb){

List<RedisCluster> redisClusterList = new ArrayList<RedisCluster>();
for(int i=0;i<itemList.size();i++){
//获得节点server
Element item=(Element)itemList.get(i);
String hostIp =  item.attribute("host").getText();
String port = item.attribute("port").getText();

RedisCluster redisCluster =new RedisCluster();
redisCluster.setHostIp(hostIp);
redisCluster.setPort(port);
redisCluster.setSelectdb(selectdb);

redisClusterList.add(redisCluster);
}
return redisClusterList;

}

public static void main(String[] args) {
getRedisGroupMap();
//JedisUtil.insertPublicDataObject("user1", "张三", JedisUtil.ONLINE_USER);
//JedisUtil.insertPublicDataObject("user2", "李四", JedisUtil.ONLINE_USER);
//JedisUtil.insertPublicDataObject("user3", "王五", JedisUtil.ONLINE_USER);

Set s = JedisUtil.getAllSet(JedisUtil.ONLINE_USER);
Iterator it = s.iterator();
while (it.hasNext()) {
String key = (String) it.next();
String value = JedisUtil.getString(key,JedisUtil.ONLINE_USER);
System.out.println(key + value);
}
String test = JedisUtil.getString("user1",JedisUtil.ONLINE_USER);
System.out.println(test);

}
}

4、操作redis数据库的工具类

package com.isoftstone.cms.syscore.utils;

import java.lang.reflect.Type;
import java.util.List;
import java.util.Set;
import java.util.zip.CRC32;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.exceptions.JedisConnectionException;

import com.google.gson.Gson;
import com.isoftstone.cms.syscore.pojo.RedisCluster;

public class JedisUtil {

// 数据库
public static final String STORE_LOGINUSER = "4";// 商户登陆用户
public static final String STORE_INFO = "5";// 商户状态 商户购买服务有效期
public static final String CHECK_CODE = "6";// 验证码
public static final String MENU = "7";// 全部菜单
public static final String SERVICE = "8";// 服务收费信息
public static final String STORE_LOGINKEY = "9";// 初始化登录公钥 私钥对
// 固定key
public static final String ALL_MENU_KEY = "ALL_MENU_KEY";
public static final String BUY_SERVICE_KEY = "BUY_SERVICE_KEY";// 服务收费购买key
public static final String ALL_SERVICE_KEY = "ALL_SERVICE_KEY";//所有服务
public static final String MENU_AUTHORITY = "MENU_AUTHORITY";// 菜单权限
public static final String STORE_MENU_KEY = "STORE_MENU_KEY";// 需要商户分配的业务菜单
public static final String STORE_SERVICE_KEY = "STORE_SERVICE_KEY";// 商户收费key
public static final String SYSTE_MENU_KEY = "SYSTE_MENU_KEY";// 系统管理菜单key

// jedis服务组业务类型
public static final String CONT_CLUSTERNAME_PUBLICDATA = "publicData";
public static final String CONT_CLUSTERNAME_SESSIONROUTE = "sessionRoute";
public static final String CONT_CLUSTERNAME_USERROUTE = "userRoute";

// 操作方式 0 插入 1获取 2 删除
public static final long INSERT_OPERATION = 0;
public static final long GET_OPERATION = 1;
public static final long DELETE_OPERATION = 2;

// 验证码过期秒数
public static final int CHECKCODE_EXPIRESECONDS = 5*60;
// session过期秒数
public static final int EXPIRESECONDS = 30 * 60;

private static void closeJedis(Jedis jedis) {
try {
jedis.quit();
} catch (JedisConnectionException e) {
e.printStackTrace();
}
jedis.disconnect();
}

/**
* 根据Key获取字符串
*
* @param key
* @param jedisGroup
*/
public static String getString(String key, String selectdb) {
Jedis jedis = getPublicDataJedis(key, GET_OPERATION, selectdb);
return jedis.get(key);
}

/**
* 获取所有数据set
* @param selectdb
* @return
*/
public static Set getAllSet(String selectdb) {
Jedis jedis = getDataJedis(GET_OPERATION, selectdb);
return jedis.keys("*");
}

/**
* 默认取配置文件的第一个数据库
* @param operation
* @param selectdb
* @return
*/
private static Jedis getDataJedis(long operation, String selectdb) {
if (RedisConfig.redisGroupMap == null) {
RedisConfig.redisGroupMap = RedisConfig.getRedisGroupMap();
}
List<RedisCluster> clustersList = RedisConfig.redisGroupMap.get(CONT_CLUSTERNAME_PUBLICDATA);

int clusterNo = 0;//默认存到第一个

RedisCluster cluster = clustersList.get(clusterNo);
Jedis jedis = new Jedis(cluster.getHostIp(), Integer.valueOf(cluster.getPort()));
jedis.select(Integer.valueOf(selectdb));
return jedis;
}

/**
* 删除数据
*
* @param key
* @param jedisGroup
*/
public static void deleteObject(String key, String jedisGroup) {
Jedis jedis = getJedis(key, jedisGroup, DELETE_OPERATION);
jedis.del(key);
closeJedis(jedis);
}

/**
* 删除公共数据
*
* @param key
* @param objClass
* @param selectdb
*/
public static void deletePublicDataObject(String key, String selectdb) {
Jedis jedis = getPublicDataJedis(key, DELETE_OPERATION, selectdb);
jedis.del(key);
closeJedis(jedis);
}

/**
* 获取jedis的库实例
*
* @param key
* @param jedisGroup
* @param operation
* @return
*/
private static Jedis getJedis(String key, String jedisGroup, long operation) {
if (RedisConfig.redisGroupMap == null) {
RedisConfig.redisGroupMap = RedisConfig.getRedisGroupMap();
}
List<RedisCluster> clustersList = RedisConfig.redisGroupMap.get(jedisGroup);
int arrayLength = clustersList.size();
// 根据key值算出该信息应该存入到那个
int clusterNo = getRedisNo(key, arrayLength);

RedisCluster cluster = clustersList.get(clusterNo);
Jedis jedis = new Jedis(cluster.getHostIp(), Integer.valueOf(cluster.getPort()));
jedis.select(Integer.valueOf(cluster.getSelectdb()));
return jedis;
}

/**
* redis key值获取对象
*
* @param key
* @param objClass
* @param jedisGroup
* @return
*/
public static Object getObject(String key, Class objClass, String jedisGroup) {
Jedis jedis = getJedis(key, jedisGroup, GET_OPERATION);

String sObj = jedis.get(key);
closeJedis(jedis);
Gson gson = new Gson();
return gson.fromJson(sObj, objClass);

}

/**
* 获取公共数据jedis的库实例
*
* @param key
* @param jedisGroup
* @param operation
* @return
*/
private static Jedis getPublicDataJedis(String key, long operation, String selectdb) {
if (RedisConfig.redisGroupMap == null) {
RedisConfig.redisGroupMap = RedisConfig.getRedisGroupMap();
}
List<RedisCluster> clustersList = RedisConfig.redisGroupMap.get(CONT_CLUSTERNAME_PUBLICDATA);
int arrayLength = clustersList.size();
// 根据key值算出该信息应该存入到那个
int clusterNo = getRedisNo(key, arrayLength);

RedisCluster cluster = clustersList.get(clusterNo);
Jedis jedis = new Jedis(cluster.getHostIp(), Integer.valueOf(cluster.getPort()));
jedis.select(Integer.valueOf(selectdb));
return jedis;
}

/**
* publicdata redis key值获取对象
*
* @param key
* @param objClass
* @param jedisGroup
* @return
*/
public static Object getPublicDataObject(String key, Class objClass, String selectdb) {
Jedis jedis = getPublicDataJedis(key, GET_OPERATION, selectdb);

String sObj = jedis.get(key);
closeJedis(jedis);
Gson gson = new Gson();
return gson.fromJson(sObj, objClass);

}

/**
* publicdata redis key值获取对象 List<Entity>
*
* @param key
* @param objClass
* @param jedisGroup
* @return
*/
public static Object getPublicDataObjectByType(String key, Type type, String selectdb) {
Jedis jedis = getPublicDataJedis(key, GET_OPERATION, selectdb);

String sObj = jedis.get(key);
closeJedis(jedis);
Gson gson = new Gson();
return gson.fromJson(sObj, type);
}

/**
* 获取redis服务器库编号
*
* @param hashKey
* @return
*/
public static int getRedisNo(String key, int arraySize) {
long hashKey = hash(key);
int redisNo = (int) (hashKey % arraySize);
return redisNo;
}

/**
* 根据key值算出hash值
*
* @param k
* @return
*/
public static long hash(String k) {
CRC32 crc32 = new CRC32();
crc32.update(k.getBytes());
return crc32.getValue();
}

/**
* redis 根据key值将对象插入到不同的库中
*
* @param key
* @param insertObj
* @param jedisGroup
*/
public static void insertObject(String key, Object insertObj, String jedisGroup) {

Jedis jedis = getJedis(key, jedisGroup, INSERT_OPERATION);
Gson gson = new Gson();
jedis.set(key, gson.toJson(insertObj));
closeJedis(jedis);
}

/**
* redis 根据key值将对象插入到不同的库中
*
* @param key
* @param insertObj
* @param jedisGroup
* @param expire
*/
public static void insertObject(String key, Object insertObj, String jedisGroup, int expireSeconds) {

Jedis jedis = getJedis(key, jedisGroup, INSERT_OPERATION);
Gson gson = new Gson();
jedis.setex(key, expireSeconds, gson.toJson(insertObj));
closeJedis(jedis);
}

/**
* publicdata redis 根据key值将对象插入到不同的库中
*
* @param key
* @param insertObj
* @param jedisGroup
*/
public static void insertPublicDataObject(String key, Object insertObj, String selectdb) {

Jedis jedis = getPublicDataJedis(key, INSERT_OPERATION, selectdb);
Gson gson = new Gson();
jedis.set(key, gson.toJson(insertObj));
closeJedis(jedis);
}

/**
* publicdata redis 根据key值将对象插入到不同的库中,
*
* @param key
* @param insertObj
* @param jedisGroup
* @param expireSeconds
*/
public static void insertPublicDataObject(String key, Object insertObj, String selectdb, int expireSeconds) {
Jedis jedis = getPublicDataJedis(key, INSERT_OPERATION, selectdb);
Gson gson = new Gson();
jedis.setex(key, expireSeconds, gson.toJson(insertObj));
closeJedis(jedis);
}

/**
* 更新redis中key的超时时间
*
* @param key
* @param jedisGroup
* @param expireSeconds
*/
public static void resetExpireSeconds(String key, String jedisGroup, int expireSeconds) {
Jedis jedis = getJedis(key, jedisGroup, GET_OPERATION);
jedis.expire(key, expireSeconds);
closeJedis(jedis);
}

}

5、所需jar包