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原文：http://blog.csdn.net/NsdnResponsibility/article/details/51028739#comments

下面介绍一下java对象之间和byte[]数组之间的相互转化。并对byte[]数据进行压缩操作。java对象转化为byte[]数组可用于redis中实现缓存。（这里暂不做介绍）.话不多说直接开实例： 
首先我们创建一个java对象：Person.java

public class Person implements Serializable{private String userName;private String password;private String phone;private String email;private String sex;private String age;public Person(){}public Person(String userName, String password, String phone, String email,String sex, String age) {super();this.userName = userName;this.password = password;this.phone = phone;this.email = email;this.sex = sex;this.age = age;}@Overridepublic String toString() {return "Person [userName=" + userName + ", password=" + password+ ", phone=" + phone + ", email=" + email + ", sex=" + sex+ ", age=" + age + "]";}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getPhone() {return phone;}public void setPhone(String phone) {this.phone = phone;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public String getAge() {return age;}public void setAge(String age) {this.age = age;}}
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下面演示对person对象的转换：Object2ByteArray.java

public class Object2ByteArray {public static void main(String[] args) {try {Person person=new Person("userName", "password", "phone", "email", "sex", "age");System.out.println("person:"+person);ByteArrayOutputStream bos=new ByteArrayOutputStream();ObjectOutputStream oos=new ObjectOutputStream(bos);oos.writeObject(person);//得到person对象的byte数组byte[] personByteArray = bos.toByteArray();System.out.println("before compress:"+personByteArray.length);//将byte数据压缩byte[] zipPersonByteArray = compress(personByteArray);System.out.println("after compress:"+zipPersonByteArray.length);closeStream(oos);closeStream(bos);//从byte数组中还原person对象ByteArrayInputStream bin=new ByteArrayInputStream(personByteArray);ObjectInputStream ois=new ObjectInputStream(bin);Person restorePerson = (Person) ois.readObject();System.out.println(restorePerson);closeStream(ois);closeStream(bin);//从压缩的byte数组中还原person对象byte[] unCompressByte = unCompress(zipPersonByteArray);ByteArrayInputStream zipBin=new ByteArrayInputStream(unCompressByte);ObjectInputStream zipOis=new ObjectInputStream(zipBin);Person zipBytePerson=(Person) zipOis.readObject();System.out.println("compress person:"+zipBytePerson.toString());closeStream(zipOis);closeStream(zipBin);} catch (Exception e) {e.printStackTrace();}}/***      * @description     关闭数据流* @param oStream       *      */public static void closeStream(Closeable oStream){if(null!=oStream){try {oStream.close();} catch (IOException e) {oStream=null;//赋值为null,等待垃圾回收e.printStackTrace();}}}/***      * @description     将byte 数组压缩* @param bt* @return      */public static byte[] compress(byte[] bt){//将byte数据读入文件流ByteArrayOutputStream bos=null;GZIPOutputStream gzipos=null;try {bos=new ByteArrayOutputStream();gzipos=new GZIPOutputStream(bos);gzipos.write(bt);} catch (Exception e) {e.printStackTrace();}finally{closeStream(gzipos);closeStream(bos);}return bos.toByteArray();}/***      * @description     解压缩byte数组* @param bt* @return      */public static byte[] unCompress(byte[] bt){//byte[] unCompress=null;ByteArrayOutputStream byteAos=null;ByteArrayInputStream byteArrayIn=null;GZIPInputStream gzipIn=null;try {byteArrayIn=new ByteArrayInputStream(bt);gzipIn=new GZIPInputStream(byteArrayIn);byteAos=new ByteArrayOutputStream();byte[] b=new byte[4096];int temp = -1;while((temp=gzipIn.read(b))>0){byteAos.write(b, 0, temp);}} catch (Exception e) {e.printStackTrace();return null;}finally{closeStream(byteAos);closeStream(gzipIn);closeStream(byteArrayIn);}return byteAos.toByteArray();}
}
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上面的示例显示了：java对象到byte[]数据的转化； 
byte[]数据的压缩和解压缩操作； 
byte[]数据还原java对象的操作；

运行结果：

person:Person [userName=userName, password=password, phone=phone, email=email, sex=sex, age=age]
before compress:189
after compress:156
Person [userName=userName, password=password, phone=phone, email=email, sex=sex, age=age]
compress person:Person [userName=userName, password=password, phone=phone, email=email, sex=sex, age=age]