0x01 創建要轉換的類和主函數

注意這里一定要實現序列化

package day1; import java.io.Serializable; public class Test360 implements Serializable { @Override public String toString() {return 'Test360{' + 'name=’' + name + ’’’ + ’}’; } String name='test';}

0x02 對象和字節數組互轉

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對象轉字節數組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 ('字節數組還原對象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; }}

運行結果

java class對象轉字節數組

-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,

字節數組還原對象

test

補充知識：java對象與byte[]數組之間的相互轉化，壓縮解壓縮操作

下面介紹一下java對象之間和byte[]數組之間的相互轉化。并對byte[]數據進行壓縮操作。java對象轉化為byte[]數組可用于redis中實現緩存。（這里暫不做介紹）.話不多說直接開實例：

首先我們創建一個java對象：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; }}

下面演示對person對象的轉換：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對象的byte數組 byte[] personByteArray = bos.toByteArray(); System.out.println('before compress:'+personByteArray.length); //將byte數據壓縮 byte[] zipPersonByteArray = compress(personByteArray); System.out.println('after compress:'+zipPersonByteArray.length); closeStream(oos); closeStream(bos); //從byte數組中還原person對象 ByteArrayInputStream bin=new ByteArrayInputStream(personByteArray); ObjectInputStream ois=new ObjectInputStream(bin); Person restorePerson = (Person) ois.readObject(); System.out.println(restorePerson); closeStream(ois); closeStream(bin); //從壓縮的byte數組中還原person對象 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 關閉數據流 * @param oStream * */ public static void closeStream(Closeable oStream){ if(null!=oStream){ try {oStream.close(); } catch (IOException e) {oStream=null;//賦值為null,等待垃圾回收e.printStackTrace(); } } } /** * * @description 將byte 數組壓縮 * @param bt * @return */ public static byte[] compress(byte[] bt){ //將byte數據讀入文件流 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 解壓縮byte數組 * @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(); }}

上面的示例顯示了：java對象到byte[]數據的轉化；

byte[]數據的壓縮和解壓縮操作；

byte[]數據還原java對象的操作；

運行結果：

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]

以上這篇JAVA對象和字節數組互轉操作就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持好吧啦網。