Java Io 对象序列化和反序列化

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Java 支持将任何对象进行序列化操作，序列化后的对象文件便可通过流进行网络传输。

1. 对象序列化就是将对象转换成字节序列，反之叫对象的反序列化

2. 序列化流ObjectOutputStream

3. 反序列化流 OjbectInputStream

4. 序列化的对象必须实现一个接口 Serializable

5. 如果在对象中不想序列化某个字段，那么可以在该字段中添加transient关键字

6. 对子类进行序列化操作时，父类的构造函数会被递归调用

7. 对子类进行反序列操作时，如果父类没有实现序列化接口那么父类的构造函数会被调用

写一个将Users对象序列化和反序列化的事例：

package com.dcz.io;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.io.OutputStream;public class ObjectSerializableDemo {public static void main(String[] args) throws Exception {// 序列化对象File writeObjectFile = new File("d:\\users.dat");if(!writeObjectFile.exists()){writeObjectFile.createNewFile();}OutputStream fileOutputStream = new FileOutputStream(writeObjectFile);ObjectOutputStream oos = new ObjectOutputStream(fileOutputStream);Users user = new Users("admin","123456","管理员用户");oos.writeObject(user);oos.flush();oos.close();// 反序列化对象File readerObjectFile = new File("d:\\users.dat");InputStream fileInputStream = new FileInputStream(readerObjectFile);ObjectInputStream ois = new ObjectInputStream(fileInputStream);Users user2 = (Users)ois.readObject();System.out.println(user2);}}

package com.dcz.io;import java.io.Serializable;public class Users implements Serializable{private static final long serialVersionUID = 4345979997811128454L;private String username;private String password;private String describe;public Users(){}public Users(String username, String password, String describe) {super();this.username = username;this.password = password;this.describe = describe;}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 getDescribe() {return describe;}public void setDescribe(String describe) {this.describe = describe;}@Overridepublic String toString() {return "Users [username=" + username + ", password=" + password+ ", describe=" + describe + "]";}}

如果不想默认序列化，想自定义序列化操作和反序列化操作就添加方法

private void writeObject(java.io.ObjectOutputStream s)        throws java.io.IOException{   // 在这里做处理序列化}

 private void readObject(java.io.ObjectInputStream s)        throws java.io.IOException, ClassNotFoundException {   // 在这里做处理反序列化}

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