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9.7 KiB
9.7 KiB
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
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
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}
sky:
redis:
host: localhost
port: 6379
password:
database: 10
1.3 编写配置类，创建RedisTemplete对象
@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
@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：
@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<DishVO>> 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<DishVO> list = (List<DishVO>) 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
@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
/**
* 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
<!-- https://mvnrepository.com/artifact/com.alibaba/easyexcel -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.10</version>
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<Student> data(){
ArrayList<Student> 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<Student> {
List<Student> list= new ArrayList<Student>();
//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();
}
}