Object,byte[],ByteBuffer之间的转换。

新版本

package cn.vicky.chapt13;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;

/** 
 * 对象序列化，反序列化（序列化对象转byte[],ByteBuffer, byte[]转object 
 *  
 * @author Vicky 
 * @email [email protected] 
 */
public class ByteUtil {

    public static byte[] getBytes(Serializable obj) throws IOException {
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(bout);
        out.writeObject(obj);
        out.flush();
        byte[] bytes = bout.toByteArray();
        bout.close();
        out.close();
        return bytes;
    }
    
    public static int sizeof(Serializable obj) throws IOException {
        return getBytes(obj).length;
    }

    public static Object getObject(byte[] bytes) throws IOException, ClassNotFoundException {
        ByteArrayInputStream bi = new ByteArrayInputStream(bytes);
        ObjectInputStream oi = new ObjectInputStream(bi);
        Object obj = oi.readObject();
        bi.close();
        oi.close();
        return obj;
    }

    public static Object getObject(ByteBuffer byteBuffer) throws ClassNotFoundException, IOException {
        InputStream input = new ByteArrayInputStream(byteBuffer.array());
        ObjectInputStream oi = new ObjectInputStream(input);
        Object obj = oi.readObject();
        input.close();
        oi.close();
        byteBuffer.clear();
        return obj;
    }

    public static ByteBuffer getByteBuffer(Serializable obj) throws IOException {
        byte[] bytes = ByteUtil.getBytes(obj);
        ByteBuffer buff = ByteBuffer.wrap(bytes);
        return buff;
    }
    
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        System.out.println(ByteUtil.sizeof(new Player1()));
        System.out.println(ByteUtil.sizeof(new Player2()));
        System.out.println(ByteUtil.sizeof(new Player3()));
        System.out.println(ByteUtil.sizeof(new Player4()));
        System.out.println(ByteUtil.sizeof(new Player5()));
        
        System.out.println("---------");
        
        Player5 p5 = new Player5();
        System.out.println(ByteUtil.sizeof(p5));
        p5.id1 = 100000;
        p5.id2 = 200000;
        System.out.println(ByteUtil.sizeof(p5));
        p5.name = "ooxx";
        System.out.println(ByteUtil.sizeof(p5));
        p5.name = "ooxxooxx";
        System.out.println(ByteUtil.sizeof(p5));
        
        System.out.println("---------");
        byte[] bytes = ByteUtil.getBytes(p5);
        Player5 p5_2 = (Player5) ByteUtil.getObject(bytes);
        System.out.println(p5_2.id1);
        System.out.println(p5_2.id2);
        System.out.println(p5_2.name);
        
        System.out.println("---------");
        System.out.println(ByteUtil.sizeof(new Player6()));
        Player6 p6 = new Player6();
        System.out.println(ByteUtil.sizeof(p6));
        p6.id1 = 100000;
        p6.id2 = 200000;
        System.out.println(ByteUtil.sizeof(p6));
        p6.setName("Vicky");
        System.out.println(ByteUtil.sizeof(p6));
        p6.setName("中文名称");
        System.out.println(ByteUtil.sizeof(p6));
        
        bytes = ByteUtil.getBytes(p6);
        Player6 p6_2 = (Player6) ByteUtil.getObject(bytes);
        System.out.println(p6_2.id1);
        System.out.println(p6_2.id2);
        System.out.println(p6_2.getName());
    }
}

class Player1 implements Serializable {
    int id1;
}

class Player2 extends Player1 {
    int id2;
}

class Player3 implements Serializable {
    int id1;
    int id2;
}

class Player4 extends Player3 {
    String name;
}

class Player5 implements Serializable {
    int id1;
    int id2;
    String name;
}

class Player6 implements Serializable {
    final static Charset chrarSet = Charset.forName("UTF-8");
    
    int id1;
    int id2;
    private byte[] name = new byte[20];

    public String getName() {
        return new String(name, chrarSet);
    }

    public void setName(String name) {
        this.name = name.getBytes(chrarSet);
    }
    
    // public void setName(String name) {
    //    byte[] tmpBytes = name.getBytes(chrarSet);
    //    for (int i = 0; i < tmpBytes.length; i++) {
    //        this.name[i] = tmpBytes[i];
    //    }
    // }
}

 

 

 

 

老版本

package cn.vicky.utils; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.nio.ByteBuffer; import org.apache.mina.core.buffer.IoBuffer; /** * 对象序列化，反序列化（序列化对象转byte[],ByteBuffer, byte[]转object * * @author Vicky * @email [email protected] */ public class ByteUtil { public static byte[] getBytes(Object obj) throws IOException { ByteArrayOutputStream bout = new ByteArrayOutputStream(); ObjectOutputStream out = new ObjectOutputStream(bout); out.writeObject(obj); out.flush(); byte[] bytes = bout.toByteArray(); bout.close(); out.close(); return bytes; } public static Object getObject(byte[] bytes) throws IOException, ClassNotFoundException { ByteArrayInputStream bi = new ByteArrayInputStream(bytes); ObjectInputStream oi = new ObjectInputStream(bi); Object obj = oi.readObject(); bi.close(); oi.close(); return obj; } public static Object getObject(ByteBuffer byteBuffer) throws ClassNotFoundException, IOException { // 需要mina框架的IoBuffer IoBuffer buffer = IoBuffer.allocate(byteBuffer.capacity()).setAutoExpand(true); // 自动展开 for (int i = 0; i < byteBuffer.capacity(); i++) { byteBuffer.position(i); buffer.put(byteBuffer.get()); } buffer.position(0); InputStream input = buffer.asInputStream(); ObjectInputStream oi = new ObjectInputStream(input); Object obj = oi.readObject(); input.close(); oi.close(); return obj; } public static ByteBuffer getByteBuffer(Object obj) throws IOException { byte[] bytes = ByteUtil.getBytes(obj); ByteBuffer buff = ByteBuffer.wrap(bytes); return buff; } }

 

以上实现了Java之间的转换，关于Java与ActionScript之间的数据传输与转换。主要思想同上暂时不予讨论。。。