对象序列化运用

import java.io.*;
import java.util.HashMap;
import java.util.Map;
 
/**
 * 自定义对象序列化
 * 将对象与字符串互转
 */
public class Serialization {
 
 
    public static void main(String[] args) throws Exception {
        Map<String, String> map = new HashMap<>();
        map.put("k1", "v1");
        map.put("k2", "v2");
        map.put("k3", "v3");
        byte[] bytes = objectToByte(map);//转字节
        String toHexString = byteArrayToHexString(bytes);//转字符串
        System.out.println("16进制字符串内容"+toHexString);
        byte[] newBytes = hexStringToByteArray(toHexString);//转字节
        Object obj = byteToObject(newBytes);//字节还原对象
        HashMap<String, String> newMap = (HashMap<String, String>) obj;//验证
        for (Map.Entry<String, String> entry : newMap.entrySet()) {
            System.out.println(entry.getKey() + ":" + entry.getValue());
        }
    }
 
    /**
     * 对象转字节
     *
     * @param obj 对象
     * @return 字节信息
     * @throws Exception
     */
    public static byte[] objectToByte(Object obj) throws Exception {
        try {
            ByteArrayOutputStream bo = new ByteArrayOutputStream();
            ObjectOutputStream oo = new ObjectOutputStream(bo);
            oo.writeObject(obj);
            byte[] bytes = bo.toByteArray();
            bo.close();
            oo.close();
            return (bytes);
        } catch (Exception e) {
            throw e;
        }
    }
 
    /**
     * 字节还原对象
     *
     * @param bytes
     * @return
     * @throws Exception
     */
    public static Object byteToObject(byte[] bytes) throws Exception {
        try {
            //bytearray to object
            ByteArrayInputStream bi = new ByteArrayInputStream(bytes);
            ObjectInputStream oi = new ObjectInputStream(bi);
            Object obj = oi.readObject();
            bi.close();
            oi.close();
            return obj;
        } catch (Exception e) {
            throw e;
        }
    }
 
 
    private static final char[] Chars = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
    private static final String HexString = "0123456789abcdef";
 
    /**
     * 字节数组转换成16进制字符串
     *
     * @param arr
     * @return content
     */
    public static String byteArrayToHexString(byte[] arr) {
        char[] c = new char[arr.length * 2];
        int index = 0;
        for (byte a : arr) {
            c[index++] = Chars[a & 0xf];
            c[index++] = Chars[a >>> 4 & 0xf];
        }
        String content = new String(c);
        return content;
    }
 
    /**
     * 16进制字符串转换成字节数组
     *
     * @param content
     * @return
     */
 
    public static byte[] hexStringToByteArray(String content) {
        byte[] arr = new byte[content.length() / 2];
        char[] crr = content.toCharArray();
        int index = 0;
        for (int i = 0; i < crr.length; ) {
            int low = HexString.indexOf(crr[i++]);
            int high = HexString.indexOf(crr[i++]);
            arr[index++] = (byte) (high << 4 | low);
        }
        return arr;
    }
 
 
}