Jedis客户端使用——2

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本文介绍如何在Redis中实现用户数据的存储与事务操作，包括从Redis获取用户信息、添加用户信息到Redis，并通过事务确保数据一致性。

在前面的例子中加入事务

package com.redis.DAO;

import java.util.HashMap;
import java.util.Map;
import java.util.Random;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.Transaction;

import com.redis.bean.UserBean;
import com.redis.storage.RedisPool;

public class UserDAO {

	private static final String U_UID = "uid";
	private static final String U_KEY = "gen_sn";
	private static final String U_NAME = "name";

	private static final String U_PROFILE_PRE = "pr:";

	public UserBean getUserFromRedis(String genSN) throws Exception {
		UserBean userBean = null;
		Jedis jedis = null;
		try {
			jedis = RedisPool.getInstance().getConnection();
			
			Map<String, String> userProfile = null;
			userProfile = jedis.hgetAll(U_PROFILE_PRE + genSN);
			
			if (null != userProfile && userProfile.size() != 0) {
				userBean = new UserBean();
				userBean.setUid(Long.parseLong(userProfile.get(U_UID)));
				userBean.setKey(userProfile.get(U_KEY));
				userBean.setName(userProfile.get(U_NAME));
			}
		} catch (NumberFormatException e) {
			throw new Exception(e);
		} finally {
			RedisPool.getInstance().releaseConnetion(jedis);
		}
		return userBean;
	}

	@SuppressWarnings("null")
	public void addUserIntoRedis(UserBean userBean) throws Exception {
		Jedis jedis = null;
		Transaction transaction=null;
		try {
			jedis = RedisPool.getInstance().getConnection();
			transaction = jedis.multi();
			
			HashMap<String, String> profileMap = new HashMap<String, String>();
			profileMap.put(U_UID, Long.toString(userBean.getUid()));
			if (userBean.getKey() != null) {
				profileMap.put(U_KEY, userBean.getKey());
			}
			if (userBean.getName() != null) {
				profileMap.put(U_NAME, userBean.getName());
			}
			// 放入整个map
			transaction.hmset(U_PROFILE_PRE + userBean.getKey(), profileMap);
									
			//50%几率抛异常
			Random r=new Random();
			int i=r.nextInt(2);
			if(i==0) {
				String sss=null;
				System.out.println(sss.length());
			}
			
			transaction.exec();
		} catch (Exception e) {
			transaction.discard(); 
			throw new Exception(e);
		} finally {
			RedisPool.getInstance().releaseConnetion(jedis);
		}
	}

}

package com.redis.service;

import com.redis.DAO.UserDAO;
import com.redis.bean.UserBean;
import com.redis.storage.RedisPool;

public class Main {
	public static void main(String[] args) {
		RedisPool.getInstance().Init();
		
		UserDAO dao=new UserDAO();
		
		UserBean user=new UserBean();
		user.setKey("test"); //唯一标识
		user.setUid(1000);
		user.setName("小高");
		try {
			dao.addUserIntoRedis(user);
		} catch (Exception e) {
			System.out.println(user+" 插入失败");
		}
		
		System.out.println("-----------------------6-----------------");
		UserBean result=null;
		try {
			result = dao.getUserFromRedis("test");
		} catch (Exception e) {
			System.out.println(user+" 获取失败");
		}
		System.out.println(result.getUid());
		System.out.println(result.getName());
	}
}