Java对象与byte[]数组之间的相互转化，压缩解压缩操作

Posted 2023-02-07 u013063153

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;
    
    @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;
    



 
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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]