【转】Java中File,byte[],Object间的变换
【转】Java中File,byte[],Object间的转换
![【转】Java中File,byte[],Object间的变换](/default/index/img?u=aHR0cDovL3d3dy5teWV4Y2VwdGlvbnMubmV0L2ltZy8yMDEzLzAzLzEwLzEwMjcyMzEwNjUuZ2lm "【转】Java中File,byte[],Object间的变换")
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
![【转】Java中File,byte[],Object间的变换](/default/index/img?u=aHR0cDovL3d3dy5teWV4Y2VwdGlvbnMubmV0L2ltZy8yMDEzLzAzLzEwLzEwMjcyMzEwNjYuZ2lm "【转】Java中File,byte[],Object间的变换")
![【转】Java中File,byte[],Object间的变换](/default/index/img?u=aHR0cDovL3d3dy5teWV4Y2VwdGlvbnMubmV0L2ltZy8yMDEzLzAzLzEwLzEwMjcyMzEwNjcuZ2lm "【转】Java中File,byte[],Object间的变换")
public class Byte_File_Object ...{
![【转】Java中File,byte[],Object间的变换](/default/index/img?u=aHR0cDovL3d3dy5teWV4Y2VwdGlvbnMubmV0L2ltZy8yMDEzLzAzLzEwLzEwMjcyMzEwNjguZ2lm "【转】Java中File,byte[],Object间的变换")
![【转】Java中File,byte[],Object间的变换](/default/index/img?u=aHR0cDovL3d3dy5teWV4Y2VwdGlvbnMubmV0L2ltZy8yMDEzLzAzLzEwLzEwMjcyMzEwNjkuZ2lm "【转】Java中File,byte[],Object间的变换")
![【转】Java中File,byte[],Object间的变换](/default/index/img?u=aHR0cDovL3d3dy5teWV4Y2VwdGlvbnMubmV0L2ltZy8yMDEzLzAzLzEwLzEwMjcyMzEwNzAuZ2lm "【转】Java中File,byte[],Object间的变换")
/** *//**
* 文件转化为字节数组
* @Author Sean.guo
* @EditTime 2007-8-13 上午11:45:28
![【转】Java中File,byte[],Object间的变换](/default/index/img?u=aHR0cDovL3d3dy5teWV4Y2VwdGlvbnMubmV0L2ltZy8yMDEzLzAzLzEwLzEwMjcyMzEwNzEuZ2lm "【转】Java中File,byte[],Object间的变换")
*/
public static byte[] getBytesFromFile(File f) ...{
if (f == null) ...{
return null;
}
try ...{
FileInputStream stream = new FileInputStream(f);
ByteArrayOutputStream out = new ByteArrayOutputStream(1000);
byte[] b = new byte[1000];
for (int n;(n = stream.read(b)) != -1;) {
stream.close();
out.close();
return out.toByteArray();
} catch (IOException e) ...{
}
return null;
}
/** *//**
* 把字节数组保存为一个文件
* @Author Sean.guo
* @EditTime 2007-8-13 上午11:45:56
*/
public static File getFileFromBytes(byte[] b, String outputFile) ...{
BufferedOutputStream stream = null;
File file = null;
try ...{
file = new File(outputFile);
FileOutputStream fstream = new FileOutputStream(file);
stream = new BufferedOutputStream(fstream);
stream.write(b);
} catch (Exception e) ...{
e.printStackTrace();
} finally ...{
if (stream != null) ...{
try ...{
stream.close();
} catch (IOException e1) ...{
e1.printStackTrace();
}
}
}
return file;
}
/** *//**
* 从字节数组获取对象
* @Author Sean.guo
* @EditTime 2007-8-13 上午11:46:34
*/
public static Object getObjectFromBytes(byte[] objBytes) throws Exception ...{
if (objBytes == null || objBytes.length == 0) ...{
return null;
}
ByteArrayInputStream bi = new ByteArrayInputStream(objBytes);
ObjectInputStream oi = new ObjectInputStream(bi);
return oi.readObject();
}
/** *//**
* 从对象获取一个字节数组
* @Author Sean.guo
* @EditTime 2007-8-13 上午11:46:56
*/
public static byte[] getBytesFromObject(Serializable obj) throws Exception ...{
if (obj == null) ...{
return null;
}
ByteArrayOutputStream bo = new ByteArrayOutputStream();
ObjectOutputStream oo = new ObjectOutputStream(bo);
oo.writeObject(obj);
return bo.toByteArray();
}
![【转】Java中File,byte[],Object间的变换](/default/index/img?u=aHR0cDovL3d3dy5teWV4Y2VwdGlvbnMubmV0L2ltZy8yMDEzLzAzLzEwLzEwMjcyMzEwNzIuZ2lm "【转】Java中File,byte[],Object间的变换")
}
一、有两点需要注意：
1、Object 对象必须是可序列化对象 。
2、可序列化的 Object 对象都可以转换为一个磁盘文件；反过来则不一定成立，只有序列
化文件才可以转换为 Object 对象。
二、相关的转换方法：
out.write(b, 0, n);}