【相关学习推荐：java基础教程】
0x01 创建要转换的类和主函数
注意这里一定要实现序列化
package day1; import java.io.Serializable; public class Test360 implements Serializable { @Override public String toString() { return "Test360{" + "name='" + name + '\'' + '}'; } String name="test";}0x02 对象和字节数组互转
package day1; import sun.jvm.hotspot.utilities.Assert; import java.io.*; public class arreytobytes { public static void main(String[] args) throws Exception { Test360 test =new Test360(); System.out.print ( "java class对象转字节数组\n" ); byte[] bufobject = getBytesFromObject(test); for(int i=0 ; i<bufobject.length ; i++) { System.out.print(bufobject[i] + ","); } System.out.println ("\n"); System.out.print ("字节数组还原对象\n"); Object object1 = null; object1=deserialize(bufobject); Test360 t1 =(Test360)object1; System.out.println (t1.name); } public static byte[] getBytesFromObject(Serializable obj) throws Exception { if (obj == null) { return null; } ByteArrayOutputStream bo = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(bo); oos.writeObject(obj); return bo.toByteArray(); } public static Object deserialize(byte[] bytes) { Object object = null; try { ByteArrayInputStream bis = new ByteArrayInputStream(bytes);// ObjectInputStream ois = new ObjectInputStream(bis); object = ois.readObject(); ois.close(); bis.close(); } catch (IOException ex) { ex.printStackTrace(); } catch (ClassNotFoundException ex) { ex.printStackTrace(); } return object; }}运行结果
java class对象转字节数组
-84,-19,0,5,115,114,0,12,100,97,121,49,46,84,101,115,116,51,54,48,76,-69,81,12,-51,122,126,-123,2,0,0,120,112,
字节数组还原对象
test
补充知识：java对象与byte[]数组之间的相互转化，压缩解压缩操作
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; } @Override public 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; }}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(); }}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:189after compress:156Person [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]
以上就是JAVA对象和字节数组互转过程的知识。速戳>>知识兔学习精品课！