java 秒杀商品需要锁吗

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数据小探 2024-12-15 19:18:02

文章标签 java 秒杀商品需要锁吗 spring apache 缓存 文章分类 Java 后端开发

一、项目介绍

目标

使用浏览器缓存／Nginx缓存/ 页面缓存/ 对象缓存／RabbitMQ队列异步下单，减少网络流量，减轻数据库压力，全面提升系统并发处理能力。

Java 微服务框架

SpringBoot／ RabbitMQ ／Redis／ MySQL

安全策略

图形验证码、限流防刷、接口地址隐藏，多种安全机制拒绝机器刷单

1.2 可以学习到

应对大并发

如何利用缓存
如何使用异步

SpringBoot 环境搭建

集成 Thymeleaf，Result 结果封装
集成 Mybatis+Druid
集成 Jedis+Redis 安装+通用缓存 Key 封装

实现登录功能

数据库设计
明文密码两次 MD5 处理
JSR303 参数检验+全局异常处理器
分布式 Session

实现秒杀功能

数据库设计
商品列表页
商品详情页
订单详情页

JMeter 压测

JMeter 入门
自定义变量模拟多用户
JMeter 命令行使用
Spring Boot 打 war 包

页面优化技术

页面缓存+URL缓存+对象缓存
页面静态化，前后端分离
静态资源优化
CDN 优化

接口优化

Redis 预减库存减少数据库访问
内存标记减少 Redis 访问
RabbitMQ 队列缓冲，异步下单，增强用户体验
RabbitMQ 安装与 Spring Boot 集成
访问 Nginx 水平扩展
压测

安全优化

秒杀接口地址隐藏
数学公式验证码
接口防刷

二、SpringBoot 环境搭建

2.1 创建工程项目，导入对应坐标

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.8.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.gx</groupId>
	<artifactId>seckill</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>seckill</name>
	<description>Seckill project for Spring Boot</description>
	<properties>
		<java.version>1.8</java.version>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

2.2 封装结果类

2.2.1 封装状态码与信息类 `CodeMsg`

package com.gx.seckill.result;

public class CodeMsg {

    private int code;
    private String msg;

    //通用的错误码
    public static CodeMsg SUCCESS = new CodeMsg(0, "success");
    public static CodeMsg SERVER_ERROR = new CodeMsg(500100, "服务端异常");
    public static CodeMsg BIND_ERROR = new CodeMsg(500101, "参数校验异常：%s");
    public static CodeMsg REQUEST_ILLEGAL = new CodeMsg(500102, "请求非法");
    public static CodeMsg ACCESS_LIMIT_REACHED= new CodeMsg(500104, "访问太频繁！");

    //登录模块 5002XX
    public static CodeMsg SESSION_ERROR = new CodeMsg(500210, "Session不存在或者已经失效");
    public static CodeMsg PASSWORD_EMPTY = new CodeMsg(500211, "登录密码不能为空");
    public static CodeMsg MOBILE_EMPTY = new CodeMsg(500212, "手机号不能为空");
    public static CodeMsg MOBILE_ERROR = new CodeMsg(500213, "手机号格式错误");
    public static CodeMsg MOBILE_NOT_EXIST = new CodeMsg(500214, "手机号不存在");
    public static CodeMsg PASSWORD_ERROR = new CodeMsg(500215, "密码错误");

    //商品模块 5003XX

    //订单模块 5004XX
    public static CodeMsg ORDER_NOT_EXIST = new CodeMsg(500400, "订单不存在");

    //秒杀模块 5005XX
    public static CodeMsg MIAO_SHA_OVER = new CodeMsg(500500, "商品已经秒杀完毕");
    public static CodeMsg REPEATE_MIAOSHA = new CodeMsg(500501, "不能重复秒杀");
    public static CodeMsg MIAOSHA_FAIL = new CodeMsg(500502, "秒杀失败");

    private CodeMsg( ) {
    }

    /**
     * 私有构造函数
     * @param code 状态码
     * @param msg 信息
     */
    private CodeMsg( int code,String msg ) {
        this.code = code;
        this.msg = msg;
    }

    public int getCode() {
        return code;
    }
//    public void setCode(int code) {
//        this.code = code;
//    }
    public String getMsg() {
        return msg;
    }
//    public void setMsg(String msg) {
//        this.msg = msg;
//    }

    public CodeMsg fillArgs(Object... args) {
        int code = this.code;
        String message = String.format(this.msg, args);
        return new CodeMsg(code, message);
    }

    @Override
    public String toString() {
        return "CodeMsg [code=" + code + ", msg=" + msg + "]";
    }
}

2.2.2 封装返回结果类 `Result<T>`

package com.gx.seckill.result;

public class Result<T> {
    private int code;
    private String msg;
    private T data;

    /**
     * 成功时调用
     */
    public static <T> Result<T> success(T data  ){
        return new Result<T>(data);
    }

    /**
     * 失败时候的调用
     */
    public static <T> Result<T> error(CodeMsg codeMsg){
        return new Result<T>(codeMsg);
    }

    /**
     * 构造函数要私有，不希望其他类可以创建 Result 对象
     * @param data
     */
    private Result(T data) {
        this.code = 0;
        this.msg = "success";
        this.data = data;
    }

    private Result(int code, String msg) {
        this.code = code;
        this.msg = msg;
    }

    private Result(CodeMsg codeMsg) {
        if(codeMsg != null) {
            this.code = codeMsg.getCode();
            this.msg = codeMsg.getMsg();
        }
    }

    public int getCode() {
        return code;
    }
    public String getMsg() {
        return msg;
    }
    public T getData() {
        return data;
    }
}

2.3 集成 Thymeleaf

1）导入依赖坐标

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

2）添加配置信息

在 application.properties 中添加配置信息

#thymeleaf
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.suffix=.html
spring.thymeleaf.cache=false
spring.thymeleaf.servlet.content-type=text/html
spring.thymeleaf.enabled=true
spring.thymeleaf.encoding=UTF-8
spring.thymeleaf.mode=HTML5

3）Controller 中验证

package com.gx.seckill.controller;

import com.gx.seckill.result.CodeMsg;
import com.gx.seckill.result.Result;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping("/demo")
public class DemoController {

    @RequestMapping("/")
    @ResponseBody
    String home() {
        return "Hello World!";
    }

    //1.rest api json 输出 2.页面
    @RequestMapping("/hello")
    @ResponseBody
    public Result<String> hello() {
        return Result.success("hello,imooc");
    }

    @RequestMapping("/helloError")
    @ResponseBody
    public Result<String> helloError() {
        return Result.error(CodeMsg.SERVER_ERROR);
    }

    @RequestMapping("/thymeleaf")
    public String  thymeleaf(Model model) {
        model.addAttribute("name", "Joshua");
        return "hello";
    }
}

2.4 集成 Mybatis

1）导入依赖坐标

<dependency>
	<groupId>org.mybatis.spring.boot</groupId>
	<artifactId>mybatis-spring-boot-starter</artifactId>
	<version>1.3.1</version>
</dependency>

<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
</dependency>

<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>druid</artifactId>
	<version>1.1.10</version>
</dependency>

2）添加配置信息

在 application.properties 中添加配置信息

# mybatis
mybatis.type-aliases-package=com.gx.seckill.domain
mybatis.configuration.map-underscore-to-camel-case=true
mybatis.configuration.default-fetch-size=100
mybatis.configuration.default-statement-timeout=3000
mybatis.mapperLocations = classpath:com/gx/seckill/dao/*.xml
# druid
spring.datasource.url=jdbc:mysql://192.168.56.10:3306/seckill?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&useSSL=false
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.filters=stat
spring.datasource.maxActive=1000
spring.datasource.initialSize=100
spring.datasource.maxWait=60000
spring.datasource.minIdle=500
spring.datasource.timeBetweenEvictionRunsMillis=60000
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=select 'x'
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
spring.datasource.poolPreparedStatements=true
spring.datasource.maxOpenPreparedStatements=20

3）测试

3.1）创建数据库

创建数据库 scekill，并创建 user 表

java 秒杀商品需要锁吗_spring

3.2）创建 user 表对应的实体类

package com.gx.seckill.domain;

public class User {
	private int id;
	private String name;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
}

3.3）创建 UserDao 查询数据库

package com.gx.seckill.dao;

import com.gx.seckill.domain.User;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

@Mapper
public interface UserDao {
	
	@Select("select * from user where id = #{id}")
	public User getById(@Param("id") int id);

	@Insert("insert into user(id, name)values(#{id}, #{name})")
	public int insert(User user);	
}

3.4）创建 UserService 用户通过 dao 查询数据库的类

package com.gx.seckill.service;

import com.gx.seckill.dao.UserDao;
import com.gx.seckill.domain.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
public class UserService {
	
	@Autowired
	UserDao userDao;
	
	public User getById(int id) {
		 return userDao.getById(id);
	}

	@Transactional
	public boolean tx() {
		User u1= new User();
		u1.setId(2);
		u1.setName("2222");
		userDao.insert(u1);
		
		User u2= new User();
		u2.setId(1);
		u2.setName("11111");
		userDao.insert(u2);
		
		return true;
	}
}

3.5）Controller 中测试

package com.gx.seckill.controller;


import com.gx.seckill.domain.User;
import com.gx.seckill.result.CodeMsg;
import com.gx.seckill.result.Result;
import com.gx.seckill.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping("/demo")
public class DemoController {

    @Autowired
    UserService userService;

    @RequestMapping("/db/get")
    @ResponseBody
    public Result<User> dbGet() {
        User user = userService.getById(1);
        return Result.success(user);
    }

    @RequestMapping("/db/tx")
    @ResponseBody
    public Result<Boolean> dbTx() {
        userService.tx();
        return Result.success(true);
    }
}

2.5 集成 Redis

1）导入依赖坐标

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

<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>fastjson</artifactId>
	<version>1.2.38</version>
</dependency>
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-configuration-processor</artifactId>
	<optional>true</optional>
</dependency>

2）`application.properties`

添加配置信息

#redis
redis.host=192.168.56.10
redis.port=6379
redis.timeout=10
#redis.password=123456
redis.poolMaxTotal=1000
redis.poolMaxIdle=500
redis.poolMaxWait=500

3）创建 RedisConfig 类

用于读取 application.properties 中 redis 的配置信息

package com.gx.seckill.redis;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix="redis")
public class RedisConfig {
	private String host;
	private int port;
	private int timeout;//秒
	private String password;
	private int poolMaxTotal;
	private int poolMaxIdle;
	private int poolMaxWait;//秒
	public String getHost() {
		return host;
	}
	public void setHost(String host) {
		this.host = host;
	}
	public int getPort() {
		return port;
	}
	public void setPort(int port) {
		this.port = port;
	}
	public int getTimeout() {
		return timeout;
	}
	public void setTimeout(int timeout) {
		this.timeout = timeout;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public int getPoolMaxTotal() {
		return poolMaxTotal;
	}
	public void setPoolMaxTotal(int poolMaxTotal) {
		this.poolMaxTotal = poolMaxTotal;
	}
	public int getPoolMaxIdle() {
		return poolMaxIdle;
	}
	public void setPoolMaxIdle(int poolMaxIdle) {
		this.poolMaxIdle = poolMaxIdle;
	}
	public int getPoolMaxWait() {
		return poolMaxWait;
	}
	public void setPoolMaxWait(int poolMaxWait) {
		this.poolMaxWait = poolMaxWait;
	}
}

4）创建 RedisPoolFactory 类

用于创建 JedisPool 对象

package com.gx.seckill.redis;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Service;

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

@Service
public class RedisPoolFactory {

	@Autowired
	RedisConfig redisConfig;
	
	@Bean
	public JedisPool JedisPoolFactory() {
		JedisPoolConfig poolConfig = new JedisPoolConfig();
		poolConfig.setMaxIdle(redisConfig.getPoolMaxIdle());
		poolConfig.setMaxTotal(redisConfig.getPoolMaxTotal());
		//unit: ms
		poolConfig.setMaxWaitMillis(redisConfig.getPoolMaxWait() * 1000);
		JedisPool jp = new JedisPool(poolConfig, redisConfig.getHost(), redisConfig.getPort(),
				redisConfig.getTimeout()*1000, redisConfig.getPassword(), 0);
		return jp;
	}
}

5）通用缓存 Key 封装

作用：为缓存中 key 添加前缀

设计：接口<-抽象类<-实现类

5.1）创建 KeyPrefix 接口

package com.gx.seckill.redis;

public interface KeyPrefix {		
	public int expireSeconds();
	public String getPrefix();
}

5.2）创建 BasePrefix 抽象类

package com.gx.seckill.redis;

public abstract class BasePrefix implements KeyPrefix{
	
	private int expireSeconds;
	
	private String prefix;
	
	public BasePrefix(String prefix) {//0代表永不过期
		this(0, prefix);
	}
	
	public BasePrefix( int expireSeconds, String prefix) {
		this.expireSeconds = expireSeconds;
		this.prefix = prefix;
	}

	@Override
	public int expireSeconds() {//默认0代表永不过期
		return expireSeconds;
	}

	@Override
	public String getPrefix() {
		String className = getClass().getSimpleName();
		return className+":" + prefix;
	}
}

5.3）UserKey

package com.gx.seckill.redis;

public class UserKey extends BasePrefix{
	private UserKey(String prefix) {
		super(prefix);
	}
	public static UserKey getById = new UserKey("id");
	public static UserKey getByName = new UserKey("name");
}

5.4）OrderKey

package com.gx.seckill.redis;

public class OrderKey extends BasePrefix {

	public OrderKey(String prefix) {
		super(prefix);
	}
	public static OrderKey getMiaoshaOrderByUidGid = new OrderKey("moug");
}

5.5）GoodsKey

package com.gx.seckill.redis;

public class GoodsKey extends BasePrefix{

	private GoodsKey(int expireSeconds, String prefix) {
		super(expireSeconds, prefix);
	}
	public static GoodsKey getGoodsList = new GoodsKey(60, "gl");
	public static GoodsKey getGoodsDetail = new GoodsKey(60, "gd");
	public static GoodsKey getMiaoshaGoodsStock= new GoodsKey(0, "gs");
}

5.6）AccessKey

package com.gx.seckill.redis;

public class AccessKey extends BasePrefix{

	private AccessKey( int expireSeconds, String prefix) {
		super(expireSeconds, prefix);
	}
	
	public static AccessKey withExpire(int expireSeconds) {
		return new AccessKey(expireSeconds, "access");
	}
	
}

5.7）MiaoshaKey

package com.gx.seckill.redis;

public class MiaoshaKey extends BasePrefix{

	private MiaoshaKey( int expireSeconds, String prefix) {
		super(expireSeconds, prefix);
	}
	public static MiaoshaKey isGoodsOver = new MiaoshaKey(0, "go");
	public static MiaoshaKey getMiaoshaPath = new MiaoshaKey(60, "mp");
	public static MiaoshaKey getMiaoshaVerifyCode = new MiaoshaKey(300, "vc");
}

5.7）MiaoshaUserKey

package com.gx.seckill.redis;

public class MiaoshaUserKey extends BasePrefix{

	public static final int TOKEN_EXPIRE = 3600*24 * 2;
	private MiaoshaUserKey(int expireSeconds, String prefix) {
		super(expireSeconds, prefix);
	}
	public static MiaoshaUserKey token = new MiaoshaUserKey(TOKEN_EXPIRE, "tk");
	public static MiaoshaUserKey getById = new MiaoshaUserKey(0, "id");
}

6）RedisService

实现 Redis 的具体操作

package com.gx.seckill.redis;

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.alibaba.fastjson.JSON;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.ScanParams;
import redis.clients.jedis.ScanResult;

@Service
public class RedisService {
	
	@Autowired
	JedisPool jedisPool;
	
	/**
	 * 获取当个对象
	 * */
	public <T> T get(KeyPrefix prefix, String key,  Class<T> clazz) {
		 Jedis jedis = null;
		 try {
			 jedis =  jedisPool.getResource();
			 //生成真正的key
			 String realKey  = prefix.getPrefix() + key;
			 String  str = jedis.get(realKey);
			 T t =  stringToBean(str, clazz);
			 return t;
		 }finally {
			  returnToPool(jedis);
		 }
	}
	
	/**
	 * 设置对象
	 * */
	public <T> boolean set(KeyPrefix prefix, String key,  T value) {
		 Jedis jedis = null;
		 try {
			 jedis =  jedisPool.getResource();
			 String str = beanToString(value);
			 if(str == null || str.length() <= 0) {
				 return false;
			 }
			//生成真正的key
			 String realKey  = prefix.getPrefix() + key;
			 int seconds =  prefix.expireSeconds();
			 if(seconds <= 0) {
				 jedis.set(realKey, str);
			 }else {
				 jedis.setex(realKey, seconds, str);
			 }
			 return true;
		 }finally {
			  returnToPool(jedis);
		 }
	}
	
	/**
	 * 判断key是否存在
	 * */
	public <T> boolean exists(KeyPrefix prefix, String key) {
		 Jedis jedis = null;
		 try {
			 jedis =  jedisPool.getResource();
			//生成真正的key
			 String realKey  = prefix.getPrefix() + key;
			return  jedis.exists(realKey);
		 }finally {
			  returnToPool(jedis);
		 }
	}
	
	/**
	 * 删除
	 * */
	public boolean delete(KeyPrefix prefix, String key) {
		 Jedis jedis = null;
		 try {
			 jedis =  jedisPool.getResource();
			//生成真正的key
			String realKey  = prefix.getPrefix() + key;
			long ret =  jedis.del(realKey);
			return ret > 0;
		 }finally {
			  returnToPool(jedis);
		 }
	}
	
	/**
	 * 增加值
	 * */
	public <T> Long incr(KeyPrefix prefix, String key) {
		 Jedis jedis = null;
		 try {
			 jedis =  jedisPool.getResource();
			//生成真正的key
			 String realKey  = prefix.getPrefix() + key;
			return  jedis.incr(realKey);
		 }finally {
			  returnToPool(jedis);
		 }
	}
	
	/**
	 * 减少值
	 * */
	public <T> Long decr(KeyPrefix prefix, String key) {
		 Jedis jedis = null;
		 try {
			 jedis =  jedisPool.getResource();
			//生成真正的key
			 String realKey  = prefix.getPrefix() + key;
			return  jedis.decr(realKey);
		 }finally {
			  returnToPool(jedis);
		 }
	}
	
	public boolean delete(KeyPrefix prefix) {
		if(prefix == null) {
			return false;
		}
		List<String> keys = scanKeys(prefix.getPrefix());
		if(keys==null || keys.size() <= 0) {
			return true;
		}
		Jedis jedis = null;
		try {
			jedis = jedisPool.getResource();
			jedis.del(keys.toArray(new String[0]));
			return true;
		} catch (final Exception e) {
			e.printStackTrace();
			return false;
		} finally {
			if(jedis != null) {
				jedis.close();
			}
		}
	}
	
    /**
	 * 命令格式：SCAN cursor [MATCH pattern] [COUNT count]
	 * @cursor 游标
	 * @[MATCH pattern] 返回和给定模式相匹配的元素
	 * @count 每次迭代所返回的元素数量
	 * @return SCAN命令返回的是一个游标，从0开始遍历，到0结束遍历。
	 */
	public List<String> scanKeys(String key) {
		Jedis jedis = null;
		try {
			jedis = jedisPool.getResource();
			List<String> keys = new ArrayList<String>();
			String cursor = "0";
			ScanParams sp = new ScanParams();
			sp.match("*"+key+"*");
			sp.count(100);
			do{
				ScanResult<String> ret = jedis.scan(cursor, sp);
				List<String> result = ret.getResult();
				if(result!=null && result.size() > 0){
					keys.addAll(result);
				}
				//再处理cursor
				cursor = ret.getStringCursor();
			}while(!cursor.equals("0"));
			return keys;
		} finally {
			if (jedis != null) {
				jedis.close();
			}
		}
	}

	//TODO 转换类型不全 Boolean、Double、Float等
	public static <T> String beanToString(T value) {
		if(value == null) {
			return null;
		}
		Class<?> clazz = value.getClass();
		if(clazz == int.class || clazz == Integer.class) {
			 return ""+value;
		}else if(clazz == String.class) {
			 return (String)value;
		}else if(clazz == long.class || clazz == Long.class) {
			return ""+value;
		}else {
			return JSON.toJSONString(value);
		}
	}

	//TODO 转换类型不全 Boolean、Double、Float等
	@SuppressWarnings("unchecked")
	public static <T> T stringToBean(String str, Class<T> clazz) {
		if(str == null || str.length() <= 0 || clazz == null) {
			 return null;
		}
		if(clazz == int.class || clazz == Integer.class) {
			 return (T)Integer.valueOf(str);
		}else if(clazz == String.class) {
			 return (T)str;
		}else if(clazz == long.class || clazz == Long.class) {
			return  (T)Long.valueOf(str);
		}else {
			return JSON.toJavaObject(JSON.parseObject(str), clazz);
		}
	}

	private void returnToPool(Jedis jedis) {
		 if(jedis != null) {
			 jedis.close();
		 }
	}
}

7）Controller 中测试

package com.gx.seckill.controller;


import com.gx.seckill.domain.User;
import com.gx.seckill.redis.RedisService;
import com.gx.seckill.redis.UserKey;
import com.gx.seckill.result.CodeMsg;
import com.gx.seckill.result.Result;
import com.gx.seckill.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping("/demo")
public class DemoController {
    @Autowired
    RedisService redisService;

    @RequestMapping("/redis/get")
    @ResponseBody
    public Result<User> redisGet() {
        User user = redisService.get(UserKey.getById, ""+1, User.class);
        return Result.success(user);
    }

    @RequestMapping("/redis/set")
    @ResponseBody
    public Result<Boolean> redisSet() {
        User user = new User();
        user.setId(1);
        user.setName("1111");
        redisService.set(UserKey.getById, ""+1, user);//UserKey:id1
        return Result.success(true);
    }
}

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