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+# SpringBoot+Redis
+
+前瞻：
+
+Reids的Java客户端有
+
+1.Jedis
+
+2.Lettuce
+
+3.Spring Data Redis
+
+我们主要使用Spring Data Redis
+
+## 1.操作步骤：
+
+### 1.1 导入Spring Data Redis 的maven坐标
+
+```xml
+
+ org.springframework.boot
+ spring-boot-starter-data-redis
+
+```
+
+### 1.2 配置redis数据源
+
+```
+spring:
+ redis:
+ host: ${sky.redis.host}
+ port: ${sky.redis.port}
+ password: ${sky.redis.password}
+ database: ${sky.redis.database}
+```
+
+```yaml
+sky:
+ redis:
+ host: localhost
+ port: 6379
+ password:
+ database: 10
+```
+
+### 1.3 编写配置类，创建RedisTemplete对象
+
+```java
+@Configuration
+@Slf4j
+public class RedisConfiguration {
+ @Bean
+ public RedisTemplate redisTemplate(RedisConnectionFactory redisConnectionFactory){
+ log.info("创建RedisTemplate对象...");
+ RedisTemplate redisTemplate = new RedisTemplate();
+ //设置redis连接工厂对象
+ redisTemplate.setConnectionFactory(redisConnectionFactory);
+ //设置redis的key的序列化器
+ redisTemplate.setKeySerializer(new StringRedisSerializer());
+ return redisTemplate;
+ }
+}
+
+```
+
+
+
+加redis的key的序列化器之前：
+
+
+
+加redis的key的序列化器之后：
+
+
+
+### 1.4 通过Redis Template对象操作Redis
+
+```java
+@SpringBootTest
+public class SpringDataRedisTest {
+ @Autowired
+ private RedisTemplate redisTemplate;
+ @Test
+ public void testRedisTemplate(){
+ System.out.println(redisTemplate);
+ //操作字符串类型
+ ValueOperations valueOperations = redisTemplate.opsForValue();
+ HashOperations hashOperations = redisTemplate.opsForHash();
+ ListOperations listOperations = redisTemplate.opsForList();
+ SetOperations setOperations = redisTemplate.opsForSet();
+ ZSetOperations zSetOperations = redisTemplate.opsForZSet();
+ }
+ //String类型
+ @Test
+ public void testString(){
+ //set get setex setnx
+ redisTemplate.opsForValue().set("name","小明");
+ String city = (String) redisTemplate.opsForValue().get("name");
+ System.out.println(city);
+ redisTemplate.opsForValue().set("code","1234",3, TimeUnit.MINUTES);
+ //setIfAbsent就是setnx
+ redisTemplate.opsForValue().setIfAbsent("lock","1");
+ redisTemplate.opsForValue().setIfAbsent("lock","2");
+ }
+ //Hash类型
+ @Test
+ public void testHash(){
+ //hset hget hdel hkeys hvals
+ HashOperations hashOperations = redisTemplate.opsForHash();
+ //hset
+ hashOperations.put("100","name","yinshunyu");
+ hashOperations.put("100","age","20");
+ //get
+ String name = (String) hashOperations.get("100", "name");
+ System.out.println(name);
+ //hkeys
+ Set keys = hashOperations.keys("100");
+ System.out.println(keys);
+ //hvals
+ List values = hashOperations.values("100");
+ System.out.println(values);
+ //hdel
+ hashOperations.delete("100","age");
+ }
+ //List类型
+ @Test
+ public void testList(){
+ //lpush lrange rpop llen
+ ListOperations listOperations = redisTemplate.opsForList();
+ listOperations.leftPushAll("mylist","a","b","c");
+ listOperations.leftPush("mylist","d");
+ List mylist = listOperations.range("mylist", 0, -1);
+ System.out.println(mylist);
+ listOperations.rightPop("mylist");
+ Long size = listOperations.size("mylist");
+ System.out.println(size);
+ }
+ //Set类型
+ @Test
+ public void testSet(){
+ //sadd smembers scard sinter sunion srem
+ SetOperations setOperations = redisTemplate.opsForSet();
+ setOperations.add("set1","a","b","c","d");
+ setOperations.add("set2","a","b","x","y");
+ //smembers 获取元素
+ Set members = setOperations.members("set1");
+ System.out.println(members);
+ //scard 元素个数
+ Long size = setOperations.size("set1");
+ System.out.println(size);
+ //sinter 交集
+ Set intersect = setOperations.intersect("set1", "set2");
+ System.out.println(intersect);
+ //sunion 并集
+ Set union = setOperations.union("set1", "set2");
+ System.out.println( union);
+ setOperations.remove("set1","a","b");
+ }
+ //ZSet类型
+ @Test
+ public void testZset(){
+ //zadd zrange zincrby zrem
+ ZSetOperations zSetOperations = redisTemplate.opsForZSet();
+
+ zSetOperations.add("zset1","a",10);
+ zSetOperations.add("zset1","b",12);
+ zSetOperations.add("zset1","c",9);
+
+ Set zset1 = zSetOperations.range("zset1", 0, -1);
+ System.out.println(zset1);
+ //zincrby 修改分数
+ zSetOperations.incrementScore("zset1","c",10);
+
+ zSetOperations.remove("zset1","a","b");
+ }
+
+}
+
+```
+
+
+
+## 2.缓存菜品模拟
+
+**修改用户端接口 DishController 的 list 方法，加入缓存处理逻辑：**
+
+```java
+ @Autowired
+ private RedisTemplate redisTemplate;
+ /**
+ * 根据分类id查询菜品
+ *
+ * @param categoryId
+ * @return
+ */
+ @GetMapping("/list")
+ @ApiOperation("根据分类id查询菜品")
+ public Result> list(Long categoryId) {
+
+ //构造redis中的key，规则：dish_分类id
+ String key = "dish_" + categoryId;
+
+ //查询redis中是否存在菜品数据
+ List list = (List) redisTemplate.opsForValue().get(key);
+ if(list != null && list.size() > 0){
+ //如果存在，直接返回，无须查询数据库
+ return Result.success(list);
+ }
+ ////////////////////////////////////////////////////////
+ Dish dish = new Dish();
+ dish.setCategoryId(categoryId);
+ dish.setStatus(StatusConstant.ENABLE);//查询起售中的菜品
+
+ //如果不存在，查询数据库，将查询到的数据放入redis中
+ list = dishService.listWithFlavor(dish);
+ ////////////////////////////////////////////////////////
+ redisTemplate.opsForValue().set(key, list);
+
+ return Result.success(list);
+ }
+```
+
+**抽取清理缓存的方法：**
+
+在管理端DishController中添加
+
+```java
+ @Autowired
+ private RedisTemplate redisTemplate;
+ /**
+ * 清理缓存数据
+ * @param pattern
+ */
+ private void cleanCache(String pattern){
+ Set keys = redisTemplate.keys(pattern);
+ redisTemplate.delete(keys);
+ }
+```
+
+**调用清理缓存的方法，保证数据一致性：**
+
+**1). 新增菜品优化**
+
+```java
+ /**
+ * 新增菜品
+ *
+ * @param dishDTO
+ * @return
+ */
+ @PostMapping
+ @ApiOperation("新增菜品")
+ public Result save(@RequestBody DishDTO dishDTO) {
+ log.info("新增菜品：{}", dishDTO);
+ dishService.saveWithFlavor(dishDTO);
+
+ //清理缓存数据
+ String key = "dish_" + dishDTO.getCategoryId();
+ cleanCache(key);
+ return Result.success();
+ }
+```
+
+# EasyExcel初步理解
+
+## 依赖导入
+
+```
+
+
+
+ com.alibaba
+ easyexcel
+ 2.1.1
+
+
+ org.projectlombok
+ lombok
+ 1.18.10
+```
+
+### 创建与表格对应的实体类
+
+```
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class Student {
+
+ @ExcelProperty(value = "学生id")
+ private Integer id;
+ @ExcelProperty(value = "学生姓名")
+ private String name;
+
+ @ExcelProperty(value = "学生年龄")
+ private Integer age;
+}
+
+```
+
+## 写操作
+
+```
+
+public class WriteExcel {
+ public static void main(String[] args) {
+
+ //准备文件路径
+ String fileName="D:/destory/test/easyexcel.xls";
+ //写出文件
+ EasyExcel.write(fileName, Student.class).sheet("easyexcel")
+ .doWrite(data());
+ }
+
+
+ private static List data(){
+ ArrayList list = new ArrayList<>();
+ for (int i = 0; i < 10; i++) {
+ Student student = new Student(i, "董德" + 1, 22 + i);
+ list.add(student);
+ }
+ return list;
+ }
+}
+```
+
+## 读操作
+
+### 改造实体类
+
+```
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class Student {
+
+ @ExcelProperty(value = "学生id",index = 0)
+ private Integer id;
+ @ExcelProperty(value = "学生姓名",index = 1)
+ private String name;
+
+ @ExcelProperty(value = "学生年龄",index = 2)
+ private Integer age;
+}
+
+```
+
+### 创建监听器
+
+```
+
+public class EasyExcelLinster extends AnalysisEventListener {
+
+ List list= new ArrayList();
+ //一行一行的去读取里面的数据
+ @Override
+ public void invoke(Student student, AnalysisContext analysisContext) {
+ System.out.println(student);
+ list.add(student);
+ }
+
+ @Override
+ public void doAfterAllAnalysed(AnalysisContext analysisContext) {
+
+ }
+
+
+}
+
+```
+
+### 读取
+
+```
+
+public class ReadExcel {
+ public static void main(String[] args) {
+ //准备文件路径
+ String fileName="D:/destory/test/easyexcel.xls";
+ EasyExcel.read(fileName, Student.class, new ExcelListener()).sheet().doRead();
+ }
+}
+
+```
+
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