实战项目商城(第七天)

课程计划：
1、内容管理功能添加缓存。
a) 使用redis做缓存工具
b) 实现系统高可用，redis需要做主备。使用redis做分片集群。Redis集群的搭建。

c) 向业务逻辑中添加缓存。

遇到406问题：

1.检查是否有Jackson包。

2.如果后缀是HTML是不能相应json数据的。需要修改后缀名。

Post乱码问题：

 使用redis做缓存

先决条件：yum install gcc-c++

1.下载redis的源码包。

2.把源码包上传到服务器。

3.解压源代码

tar -zxvf redis-3.0.0.tar.gz

4.make

5.make install PREFIX=/usr/local/redis

启动redis

1丶/usr/local/redis/redis-service  端口是6397

2、后端启动
1）从redis的源码目录中复制redis.conf到redis的安装目录。
2）修改配置文件

3）[root@bogonbin]# ./redis-server redis.conf

 Redis集群的搭建

需要安装ruby

yum install ruby

yum install rubygems

redis集群管理工具redis-trib.rb
[root@bogon ~]# cd redis-3.0.0
[root@bogon redis-3.0.0]# cd src
[root@bogon src]# ll *.rb
-rwxrwxr-x. 1 root root 48141 Apr  1 07:01 redis-trib.rb
[root@bogon src]# 

安装ruby的包：

gem install redis-3.0.0.gem

[root@bogon ~]# gem install redis-3.0.0.gem

Successfully installed redis-3.0.0

1 gem installed

Installing ri documentation forredis-3.0.0...

Installing RDoc documentation forredis-3.0.0...

集群的搭建

1.创建6个redis实例，端口号从7001~7006

2.修改redis的配置文件

3.把创建集群的ruby脚本复制到redis-cluster目录下

4.启动6个redis实例

5.创建集群

./redis-trib.rb create --replicas 1 192.168.25.153:7001 192.168.25.153:7002 192.168.25.153:7003 192.168.25.153:7004 192.168.25.153:7005  192.168.25.153:7006

测试集群：

[root@bogon redis-cluster]# redis01/redis-cli -h 192.168.25.153 -p 7002 -c
关闭redis：

redis01/redis-cli -p 7001 shutdown

[root@bogon redis-cluster]# redis01/redis-cli -h 192.168.25.153 -p 7002
192.168.25.153:7002> set a 100
(error) MOVED 15495 192.168.25.153:7003
192.168.25.153:7002> 
[root@bogon redis-cluster]# redis01/redis-cli -h 192.168.25.153 -p 7002 -c
192.168.25.153:7002> set a 100
-> Redirected to slot [15495] located at 192.168.25.153:7003
OK
192.168.25.153:7003> 

Redis客户端

Redis-cli

自带客户端。使用最多的。

图形化界面客户端

需要注意哦：开启6397的端口

Jedis客户端

需要把jedis的jar包添加到工程中，如果是maven需要添加jar包的坐标。

单机版：

@Testpublic void testJedisSingle(){//创建一个jedis的对象Jedis jedis = new Jedis("192.168.126.133",6379);jedis.auth("123");//调用jedis对象的方法，方法名称和redis的命令一致jedis.set("key1","jedis test");String string = jedis.get("key1");System.out.println(string);jedis.close();}@Testpublic void testJedispoll(){JedisPool pool = new JedisPool("192.168.126.133",6379);Jedis resource = pool.getResource();resource.auth("123");String string = resource.get("key1");System.out.println(string);resource.close();pool.close();}

集群版：

要打开虚拟机的端口，见另外转载的一篇博客。

@Testpublic void testJedisCluster(){HashSet<HostAndPort> nodes = new HashSet<>();nodes.add(new HostAndPort("192.168.126.133", 7001));nodes.add(new HostAndPort("192.168.126.133", 7002));nodes.add(new HostAndPort("192.168.126.133", 7003));nodes.add(new HostAndPort("192.168.126.133", 7004));nodes.add(new HostAndPort("192.168.126.133", 7005));nodes.add(new HostAndPort("192.168.126.133", 7006));JedisCluster cluster = new JedisCluster(nodes);//cluster.auth("123");cluster.set("key1", "1000");String string = cluster.get("key1");System.out.println(string);cluster.close();}

jedis整合spring

单机整合：

<bean id="redisClient" class="redis.clients.jedis.JedisPool"><constructor-arg name="host" value="192.168.126.133"></constructor-arg><constructor-arg name="port" value="6379"></constructor-arg></bean>

@Testpublic void testSpring(){ApplicationContext context = new ClassPathXmlApplicationContext("classpath:spring/applicationContext-jedis.xml");JedisPool pool = (JedisPool) context.getBean("redisClient");Jedis jedis = pool.getResource();jedis.auth("123");String string = jedis.get("key1");System.out.println(string);pool.close();jedis.close();}

集群版：

<!-- 集群版 --><bean id="redisClient" class="redis.clients.jedis.JedisCluster"><constructor-arg name="nodes"><set><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.126.133"></constructor-arg><constructor-arg name="port" value="7001"></constructor-arg></bean><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.126.133"></constructor-arg><constructor-arg name="port" value="7002"></constructor-arg></bean><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.126.133"></constructor-arg><constructor-arg name="port" value="7003"></constructor-arg></bean><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.25.153"></constructor-arg><constructor-arg name="port" value="7004"></constructor-arg></bean><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.126.133"></constructor-arg><constructor-arg name="port" value="7005"></constructor-arg></bean><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.126.133"></constructor-arg><constructor-arg name="port" value="7006"></constructor-arg></bean></set></constructor-arg><!-- <constructor-arg name="poolConfig" ref="jedisPoolConfig"></constructor-arg> --></bean>

@Testpublic void testCluster(){ApplicationContext context = new ClassPathXmlApplicationContext("classpath:spring/applicationContext-jedis.xml");JedisCluster cluster = (JedisCluster) context.getBean("redisClient");//cluster.auth("123");String string = cluster.get("key1");System.out.println(string);cluster.close();}

添加jedis dao
单机版

@Autowiredprivate JedisPool jedisPool;@Overridepublic String get(String key) {Jedis jedis = jedisPool.getResource();jedis.auth("123");String string = jedis.get(key);jedis.close();return string;}@Overridepublic String set(String key, String value) {Jedis jedis = jedisPool.getResource();jedis.auth("123");String set = jedis.set(key, value);jedis.close();return set;}@Overridepublic String hget(String hkey, String key) {Jedis jedis = jedisPool.getResource();jedis.auth("123");String set = jedis.hget(hkey, key);jedis.close();return set;}@Overridepublic Long hset(String hkey, String key, String value) {Jedis jedis = jedisPool.getResource();jedis.auth("123");Long hset = jedis.hset(hkey, key, value);jedis.close();return hset;}@Overridepublic long incr(String key) {Jedis jedis = jedisPool.getResource();Long long1 = jedis.incr(key);jedis.close();return long1;}@Overridepublic long expire(String key, int second) {Jedis jedis = jedisPool.getResource();Long expire = jedis.expire(key, second);jedis.close();return expire;}@Overridepublic long ttl(String key) {Jedis jedis = jedisPool.getResource();Long ttl = jedis.ttl(key);jedis.close();return ttl;}

spring配置文件

<bean id="redisClient" class="redis.clients.jedis.JedisPool"><constructor-arg name="host" value="192.168.126.133"></constructor-arg><constructor-arg name="port" value="6379"></constructor-arg></bean><bean id="jedisClient" class="com.taotao.rest.dao.impl.JedisClientSingle"></bean>

集群版

@Autowiredprivate JedisCluster jedisCluster; @Overridepublic String get(String key) {// TODO Auto-generated method stubreturn jedisCluster.get(key);}@Overridepublic String set(String key, String value) {// TODO Auto-generated method stubreturn jedisCluster.set(key, value);}@Overridepublic String hget(String hkey, String key) {// TODO Auto-generated method stubreturn jedisCluster.hget(hkey, key);}@Overridepublic Long hset(String hkey, String key, String value) {// TODO Auto-generated method stubreturn jedisCluster.hset(hkey, key, value);}@Overridepublic long incr(String key) {// TODO Auto-generated method stubreturn jedisCluster.incr(key);}@Overridepublic long expire(String key, int second) {// TODO Auto-generated method stubreturn jedisCluster.expire(null, second);}@Overridepublic long ttl(String key) {// TODO Auto-generated method stubreturn jedisCluster.ttl(key);}

spring配置文件

<bean id="redisClient" class="redis.clients.jedis.JedisCluster"><constructor-arg name="nodes"><set><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.126.133"></constructor-arg><constructor-arg name="port" value="7001"></constructor-arg></bean><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.126.133"></constructor-arg><constructor-arg name="port" value="7002"></constructor-arg></bean><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.126.133"></constructor-arg><constructor-arg name="port" value="7003"></constructor-arg></bean><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.25.153"></constructor-arg><constructor-arg name="port" value="7004"></constructor-arg></bean><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.126.133"></constructor-arg><constructor-arg name="port" value="7005"></constructor-arg></bean><bean class="redis.clients.jedis.HostAndPort"><constructor-arg name="host" value="192.168.126.133"></constructor-arg><constructor-arg name="port" value="7006"></constructor-arg></bean></set></constructor-arg></bean> <bean id="jedisClientCluster" class="com.taotao.rest.dao.impl.JedisClientCluster"></bean> 

把缓存添加到业务逻辑

@Autowiredprivate TbContentMapper contentMapper;@Autowiredprivate JedisClient jedisClient;@Value("${INDEX_CONTENT_REIDS_KEY}")private String INDEX_CONTENT_REIDS_KEY;@Overridepublic List<TbContent> getContentList(long contentCid) {//从缓存中取try {String string = jedisClient.hget(INDEX_CONTENT_REIDS_KEY, contentCid+"");if(!StringUtils.isEmpty(string)){List<TbContent> resultList = JsonUtils.jsonToList(string, TbContent.class);return resultList;}} catch (Exception e) {e.printStackTrace();}TbContentExample example = new TbContentExample();Criteria criteria = example.createCriteria();criteria.andCategoryIdEqualTo(contentCid);List<TbContent> list = contentMapper.selectByExample(example);//向缓存中添加内容try {//把list转换成字符串String cacheString = JsonUtils.objectToJson(list);jedisClient.hset(INDEX_CONTENT_REIDS_KEY, contentCid+"", cacheString);} catch (Exception e) {e.printStackTrace();}return list;}

缓存同步

当后台管理系统，修改内容之后需要通知redis把修改的内容对应的分类id的key删除。

Dao层
使用JedisClient接口对应的实现类。

6.4 Service层
接收内容分类id，调用dao删除redis中对应的hash中key为分类id的项。
参数：内容分类id
返回值：TaotaoResult

@Serviceclass RedisServiceImpl implements RedisService{@Autowiredprivate JedisClient jedisClient;@Value("${INDEX_CONTENT_REIDS_KEY}")private String INDEX_CONTENT_REIDS_KEY;@Overridepublic TaotaoResult syncContent(long contentCid) {try {jedisClient.hdel(INDEX_CONTENT_REIDS_KEY, contentCid+"");} catch (Exception e) {return TaotaoResult.build(500, ExceptionUtil.getStackTrace(e));     }return TaotaoResult.ok();}}

Controller层
接收内容分类id，调用Service返回taotaoResult。

@Controller@RequestMapping("/cache/sync")public class RedisController {@Autowiredprivate RedisService redisService;@RequestMapping("/content/{contentCid}")@ResponseBodypublic TaotaoResult contentCahceSync(@PathVariable Long contentCid){TaotaoResult result = redisService.syncContent(contentCid);return result;}}

同步缓存服务的调用
需要在后台管理系统中添加一个服务调用的逻辑。当修改内容信息后，需要调用此服务同步缓存。

//添加缓存同步逻辑try {HttpClientUtil.doGet(REST_BASE_URL+REST_CONTENT_SYNC_URL+tbContent.getCategoryId());} catch (Exception e) {e.printStackTrace();}