【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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