JAVA对象和字节数组互转过程

【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: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]

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