SimpleBloomFilter 持久化

[html]
package bloom;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.BitSet;

/**
* @author Keeny (2013-1-2)
**/
public class SimpleBloomFilter {
    private static final int DEFAULT_SIZE = 2 << 24;
    private static final int[] seeds = new int[] { 7, 11, 13, 31, 37, 61, };
    private BitSet bits = new BitSet(DEFAULT_SIZE);
    private SimpleHash[] func = new SimpleHash[seeds.length];

    public static void main(String[] args) {
        String fileName = "d:\\bloom\\BloomFilter.txt";
        String value = "stone2083@yahoo.cn";
        SimpleBloomFilter filter = new SimpleBloomFilter();
        BitSet bitSet = filter.readBit(fileName);
        filter.setBits(bitSet);

        System.out.println(filter.contains(value));
        filter.add(value);
        System.out.println(filter.contains(value));

        filter.saveBit(fileName);
    }

    public void setBits(BitSet bits) {
        this.bits = bits;
    }

    public void saveBit(String filename) {

        try {
            File file = new File(filename);
            ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file, false));
            oos.writeObject(bits);
            oos.flush();
            oos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public BitSet readBit(String filename) {
        BitSet bits = new BitSet(DEFAULT_SIZE);
        File file = new File(filename);
        if (!file.exists()) {
            return bits;
        }
        try {
            ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file));
            bits = (BitSet) ois.readObject();
            ois.close();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        return bits;
    }

    public SimpleBloomFilter() {
        for (int i = 0; i < seeds.length; i++) {
            func[i] = new SimpleHash(DEFAULT_SIZE, seeds[i]);
        }
    }

    // 覆盖方法，把URL 添加进来
    public void add(String value) {
        for (SimpleHash f : func) {
            bits.set(f.hash(value), true);
        }
    }

    // 覆盖方法，是否包含URL
    public boolean contains(String value) {
        if (value == null) {
            return false;
        }
        boolean ret = true;
        for (SimpleHash f : func) {
            ret = ret && bits.get(f.hash(value));
        }
        return ret;
    }

    public static class SimpleHash {
        private int cap;
        private int seed;

        public SimpleHash(int cap, int seed) {
            this.cap = cap;
            this.seed = seed;
        }

        public int hash(String value) {
            int result = 0;
            int len = value.length();
            for (int i = 0; i < len; i++) {
                result = seed * result + value.charAt(i);
            }
            return (cap - 1) & result;
        }
    }
}

package bloom;

import java.io.Fil

补充：web前端 , HTML/CSS  ,