方式一：单一容器存储
import java.util.Date;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public class MemoryCacheUtils {
// 容器
private static Map CACHE_DATA = new ConcurrentHashMap<>();
public static T getData(String key, Load load, int expire) {
T data = getData(key);
if (data == null && load != null) {
data = load.load();
if (data != null) {
setData(key, data, expire);
}
}
return data;
}
public static T getData(String key) {
CacheData data = CACHE_DATA.get(key);
// 数据未过期则返回
if (data != null && (data.getExpire() <= 0 || data.getSaveTime() >= new Date().getTime())) {
return data.getData();
} else {// 数据过期则清除key
clear(key);
}
return null;
}
public static int getDataSize() {
return CACHE_DATA.size();
}
public static void setData(String key, T data, int expire) {
CACHE_DATA.put(key, new CacheData(data, expire));
}
public static void clear(String key) {
CACHE_DATA.remove(key);
}
public static void clearAll() {
CACHE_DATA.clear();
}
public interface Load {
T load();
}
private static class CacheData {
private T data;
private long saveTime; // 存活时间
private long expire; // 过期时间 小于等于0标识永久存活
CacheData(T t, int expire) {
this.data = t;
this.expire = expire <= 0 ? 0 : expire * 1000;
this.saveTime = new Date().getTime() + this.expire;
}
public T getData() {
return data;
}
public long getExpire() {
return expire;
}
public long getSaveTime() {
return saveTime;
}
}
}
@RestController
@RequestMapping(path = "/cache1")
public class MemoryCacheUtilsTest {
@GetMapping("/set")
public String setCache(){
String value = "{" hitemperature":"0"," lotemperature":"20","weather":"阵雨","weathersign":"http://clientdispatch.10086.cn:8080/group1/M00/00/A3/rBCJYVd2NiaAWmFNAADQT5AGIH8336.jpg","weatherbluesign":"http://clientdispatch.10086.cn:8080/group1/M00/00/A3/rBCJYVd2NiaAWmFNAADQT5AGIH8336.jpg"}";
for (int i = 0;i<=200; i++){
WeatherCacheUtils.setData("001"+i,value+i,300);
}
return "数据缓存成功";
}
@PostMapping("/get")
public String getCache(@RequestBody String count){
// 泛型实体根据实际情况定，此处只为模拟
MemoryCacheUtils.Load ss = new MemoryCacheUtils.Load(){
@Override
public CacheEntity load() {
return null;
}
};
//System.out.println(WeatherCacheUtils.getData("001"+count).toString());
WeatherCacheUtils.getData("",ss,522);
return WeatherCacheUtils.getData("001"+count);
}
@GetMapping("/setValue")
public String setCacheValue(){
String value = "{" hitemperature":"0"," lotemperature":"20","weather":"阵雨","weathersign":"http://clientdispatch.10086.cn:8080/group1/M00/00/A3/rBCJYVd2NiaAWmFNAADQT5AGIH8336.jpg","weatherbluesign":"http://clientdispatch.10086.cn:8080/group1/M00/00/A3/rBCJYVd2NiaAWmFNAADQT5AGIH8336.jpg"}";
WeatherCacheUtils.setData("001"+300,value+300,300);
return "数据缓存成功";
}
@GetMapping("/hi")
public String hi(String count){
System.out.println("hello");
return "hello";
}
}
