工具类(ExpiryMap 实现过期时间不需要redis)

粘上可以直接用！！！！！！

测试类可以测试一下

public static void main(String[] args) throws InterruptedException {

        ExpiryMap map = new ExpiryMap<>(10);
        map.put("test", "ankang");
        map.put("test1", "ankang");
        map.put("test2", "ankang", 3000);
        System.out.println("test1" + map.get("test"));
        Thread.sleep(1000);
        System.out.println("isInvalid:" + map.isInvalid("test"));
        System.out.println("size:" + map.size());
        System.out.println("size:" + ((HashMap)map).size());
        for (Entry m : map.entrySet()) {
            System.out.println("isInvalid:" + map.isInvalid(m.getKey()));
            map.containsKey(m.getKey());
            System.out.println("key:" + m.getKey() + "     value:" + m.getValue());
        }
        System.out.println("test1" + map.get("test"));

    }

package cn.datamining.stake.station.util;


import java.util.*;

/**
 *
 * @Description: 带有效期map 简单实现 实现了基本的方法
 * @author: qd-ankang
 * @date: 2016-11-24 下午4:08:46
 * @param 
 * @param 
 */
public class ExpiryMap extends HashMap{

    private static final long serialVersionUID = 1L;

    /**
     * default expiry time 2m
     */
    private long EXPIRY = 1000 * 60 * 15;

    private HashMap expiryMap = new HashMap<>();

    public ExpiryMap(){
        super();
    }
    public ExpiryMap(long defaultExpiryTime){
        this(1 << 4, defaultExpiryTime);
    }
    public ExpiryMap(int initialCapacity, long defaultExpiryTime){
        super(initialCapacity);
        this.EXPIRY = defaultExpiryTime;
    }
    public V put(K key, V value) {
        expiryMap.put(key, System.currentTimeMillis() + EXPIRY);
        return super.put(key, value);
    }
    public boolean containsKey(Object key) {
        return !checkExpiry(key, true) && super.containsKey(key);
    }
    /**
     * @param key
     * @param value
     * @param expiryTime 键值对有效期 毫秒
     * @return
     */
    public V put(K key, V value, long expiryTime) {
        expiryMap.put(key, System.currentTimeMillis() + expiryTime);
        return super.put(key, value);
    }
    public int size() {
        return entrySet().size();
    }
    public boolean isEmpty() {
        return entrySet().size() == 0;
    }
    public boolean containsValue(Object value) {
        if (value == null) return Boolean.FALSE;
        Set> set = super.entrySet();
        Iterator> iterator = set.iterator();
        while (iterator.hasNext()) {
            Entry entry = iterator.next();
            if(value.equals(entry.getValue())){
                if(checkExpiry(entry.getKey(), false)) {
                    iterator.remove();
                    return Boolean.FALSE;
                }else return Boolean.TRUE;
            }
        }
        return Boolean.FALSE;
    }
    public Collection values() {

        Collection values = super.values();

        if(values == null || values.size() < 1) return values;

        Iterator iterator = values.iterator();

        while (iterator.hasNext()) {
            V next = iterator.next();
            if(!containsValue(next)) iterator.remove();
        }
        return values;
    }
    public V get(Object key) {
        if (key == null)
            return null;
        if(checkExpiry(key, true))
            return null;
        return super.get(key);
    }
    /**
     *
     * @Description: 是否过期
     * @param key
     * @return null:不存在或key为null -1:过期  存在且没过期返回value 因为过期的不是实时删除，所以稍微有点作用
     */
    public Object isInvalid(Object key) {
        if (key == null)
            return null;
        if(!expiryMap.containsKey(key)){
            return null;
        }
        long expiryTime = expiryMap.get(key);

        boolean flag = System.currentTimeMillis() > expiryTime;

        if(flag){
            super.remove(key);
            expiryMap.remove(key);
            return -1;
        }
        return super.get(key);
    }
    public void putAll(Map m) {
        for (Entry e : m.entrySet())
            expiryMap.put(e.getKey(), System.currentTimeMillis() + EXPIRY);
        super.putAll(m);
    }
    public Set> entrySet() {
        Set> set = super.entrySet();
        Iterator> iterator = set.iterator();
        while (iterator.hasNext()) {
            Entry entry = iterator.next();
            if(checkExpiry(entry.getKey(), false)) iterator.remove();
        }

        return set;
    }
    /**
     *
     * @Description: 是否过期
     * @author: qd-ankang
     * @date: 2016-11-24 下午4:05:02
     * @param expiryTime true 过期
     * @param isRemoveSuper true super删除
     * @return
     */
    private boolean checkExpiry(Object key, boolean isRemoveSuper){

        if(!expiryMap.containsKey(key)){
            return Boolean.FALSE;
        }
        long expiryTime = expiryMap.get(key);

        boolean flag = System.currentTimeMillis() > expiryTime;

        if(flag){
            if(isRemoveSuper)
                super.remove(key);
            expiryMap.remove(key);
        }
        return flag;
    }
    public static void main(String[] args) throws InterruptedException {

        ExpiryMap map = new ExpiryMap<>(10);
        map.put("test", "ankang");
        map.put("test1", "ankang");
        map.put("test2", "ankang", 3000);
        System.out.println("test1" + map.get("test"));
        Thread.sleep(1000);
        System.out.println("isInvalid:" + map.isInvalid("test"));
        System.out.println("size:" + map.size());
        System.out.println("size:" + ((HashMap)map).size());
        for (Entry m : map.entrySet()) {
            System.out.println("isInvalid:" + map.isInvalid(m.getKey()));
            map.containsKey(m.getKey());
            System.out.println("key:" + m.getKey() + "     value:" + m.getValue());
        }
        System.out.println("test1" + map.get("test"));

    }
}