在java网络编程中，字节数组很重要，它可以传输任何资料（文本，音频，视频，图片等），因此掌握字节数组和其它数据类型的相互转化尤为重要。
示例代码：
package com.lky.util; import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream; import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory; import com.lky.model.Student; /**
* @ClassName: objectToByteArray
* @Description: 字节数组工具类
* @author lky
* @date 2015年10月26日
* @vesion 1.0
*/
public class objectToByteArray { private static Log log = LogFactory.getLog(objectToByteArray.class);
private static Integer MAX_LENGTH = 2048;// 每次从流中读入多少字节 /**
* @Title: getByteArray
* @Description: 从输入流中读取数据，并返回字节数组
* @param in 输入流
*/
public static byte[] getByteArray(InputStream in) {
ByteArrayOutputStream baos = new ByteArrayOutputStream(); try {
byte[] buffer = new byte[MAX_LENGTH];
int len = 0; while ((len = in.read(buffer, 0, buffer.length)) != -1) {
baos.write(buffer, 0, len);
baos.flush();
buffer = new byte[MAX_LENGTH];
} } catch (Exception e) { } finally {
try {
if (in != null) {
in.close();
}
if (baos != null) {
baos.close();
}
} catch (Exception e2) {
log.info("字节流关闭异常!!!");
}
}
return baos.toByteArray();
} /**
* @Title: ObjectToByte
* @Description: 将对象转化为字节数组
* @param object
*/
public static byte[] ObjectToByte(Object object) {
ByteArrayOutputStream baos = null;
ObjectOutputStream oos = null; try {
baos = new ByteArrayOutputStream();
oos = new ObjectOutputStream(baos); oos.writeObject(object);
oos.flush(); } catch (Exception e) {
log.info("object转化为byte数组异常！！！");
} finally {
try {
if (oos != null) {
oos.close();
}
if (baos != null) {
baos.close();
}
} catch (Exception e2) {
log.info("字节流关闭异常!!!");
}
}
return baos.toByteArray();
} /**
* @Title: byteArrayToObject
* @Description: 将字节数组转化为对象
* @param buffer
*/
public static Object byteArrayToObject(byte[] buffer) {
Object object = null;
ByteArrayInputStream bais = null;
ObjectInputStream oss = null; try {
bais = new ByteArrayInputStream(buffer);
oss = new ObjectInputStream(bais); object = oss.readObject(); } catch (Exception e) {
log.info("object转化为byte数组异常！！！");
} finally {
try {
if (oss != null) {
oss.close();
}
if (bais != null) {
bais.close();
}
} catch (Exception e2) {
log.info("字节流关闭异常!!!");
}
}
return object;
} public static void main(String args[]){
Student student=new Student();
student.setId(1);
student.setLog("log");
student.setName("lky");
System.out.println(student); byte[] buffer=ObjectToByte(student); System.out.println(buffer.length);
System.out.println((Student)byteArrayToObject(buffer)); }
}