Serializable序列化(二)_serializable2-优快云博客

本文链接：https://blog.youkuaiyun.com/gzu_imis/article/details/20002385

本文深入探讨了Java序列化与反序列化的原理，并通过实例展示了如何使用transient关键字避免某些域被序列化，以及如何实现对象的序列化与反序列化过程。

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package serializ;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Calendar;
import java.util.Date;

/**
 * 有些域不想序列化或者有些域序列化之后并没有意义
 * 因为可能反序列化之后的环境：用不上有这些域，或者也不能用
 * 
 * 使用 transient 来修饰域即可防止该字段序列化
 * 
 * @author yli
 *
 */
public class SerialTest {

 public static void main(String[] args) {
  Page p = new Page(1001, "index", Calendar.getInstance().getTime());
  System.out.println(p);

  String file = "src/serializ/page.dat";
  writeObject(p, file);

  Page sp = (Page) readObject(file);
  System.out.println(sp);
 }

 // 序列化对象
 private static void writeObject(Object obj, String file) {
  ObjectOutputStream oos = null;
  try {
   oos = new ObjectOutputStream(new BufferedOutputStream(
     new FileOutputStream(file)));
   oos.writeObject(obj);
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   try {
    oos.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
 }

 // 反序列化
 private static Object readObject(String file) {
  ObjectInputStream ois = null;
  Object obj = null;
  try {
   ois = new ObjectInputStream(new BufferedInputStream(
     new FileInputStream(file)));
   obj = ois.readObject();
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  } catch (ClassNotFoundException e) {
   e.printStackTrace();
  } finally {
   try {
    ois.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
  return obj;
 }
}

class Page implements Serializable {
 private static final long serialVersionUID = -5281143296574186232L;
 private int pageId;
 private String pageName;
 
 // transient 修饰符
 private transient Date createDate;

 public Page(int pageId, String pageName, Date createDate) {
  this.pageId = pageId;
  this.pageName = pageName;
  this.createDate = createDate;
 }

 public String toString() {
  return String.format("{pageId:%s,pageName:%s,createDate:%s}",
    this.pageId, this.pageName, this.createDate);
 }
}