Base64.java 工具类

 

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

@SuppressWarnings("restriction")
public class Base64 {
    /**
     * str 编码为base64
     * 
     * @param String s
     * @return String base64
     * */
    public static String getBase64(String s) {
        if (s == null)
            return null;
        return (new sun.misc.BASE64Encoder()).encode(s.getBytes());
    }

    /**
     * byte[] 编码为base64
     * 
     * @param byte[] ba
     * @return String base64
     * */
    public static String getBase64(byte[] ba) {
        if (ba == null)
            return null;
        return (new sun.misc.BASE64Encoder()).encode(ba);
    }

    /**
     * base64 解码为 byte[]
     * 
     * @param String base64
     * @return byte[]
     * @throws IOException
     * */
    public static byte[] base64ToByteArray(String base64) throws IOException {
        if (base64 == null)
            return null;
        return (new sun.misc.BASE64Decoder()).decodeBuffer(base64);
    }
    
    /**
     * 将base64 字符串反序列化为指定的类
     * 
     * @param base64 序列化后用Base64编码的字符串
     * @param serializedClass 序列化对象的class
     * 
     * @return typed object, can be null.
     * */
    @SuppressWarnings("unchecked")
    public static <T> T deFromBase64(String base64, Class<T> serializedClass) {
        Object o = null;
        byte[] ba = null;
        ByteArrayInputStream bai = null;
        ObjectInputStream oi = null;
        try {
            ba = Base64.base64ToByteArray(base64);
            bai = new ByteArrayInputStream(ba);
            oi = new ObjectInputStream(bai);
            o = oi.readObject();
        } catch (IOException e) {
            System.out.println("反序列化失败！");
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            System.out.println("类未找到！");
            e.printStackTrace();
        } finally {
            try {
                if (oi != null) {
                    oi.close();
                }
                if (bai != null) {
                    bai.close();
                }
            } catch (IOException e) {
                System.out.println("关闭流异常！");
                e.printStackTrace();
            }
        }
        return o == null ? null : (T) o;
    }

    /**
     * 将对象序列化为Base64 字符串
     * 
     * @param obj 实现了可序列化接口的对象
     * @return String 对象序列化为字符串后编码为Base64
     * */
    public static String se2base64(Serializable obj) {
        byte[] ba = null;
        ByteArrayOutputStream baos = null;
        ObjectOutputStream oos = null;
        try {
            baos = new ByteArrayOutputStream();
            oos = new ObjectOutputStream(baos);
            oos.writeObject(obj);
            ba = baos.toByteArray();
        } catch (IOException e) {
            System.out.println("序列化失败！");
        } finally {
            try {
                if (baos != null) {
                    baos.close();
                }
                if (oos != null) {
                    oos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return ba == null ? null : Base64.getBase64(ba);
    }
}