黑马程序员——Java基础——IO流（三）—序列流、管道流、RandomAccessFile类、操作基本数据类型的流对象、操作数组和字符串、字符编码

 1 /*一下主要为了演示如何对象序列化
 2  * 关键字：ObjectOutputStream：方法有writerObject()读取
 3  *         ObjectInputStream     方法有readObject()
 4  *     被序列化的对象需要    implements Serializable
 5  * 
 6  */
 7 import java.io.*;
 8 public class ObjectStreamDemo {
 9     public static void main(String[] args) throws IOException,ClassNotFoundException{
10         
11         Person p=new Person("水音",25,"kr");
12         
13         File f=new File("D:\\sy.txt");
14                 
15         writeObj(p,f);
16         readObj(f);
17     }
18     
19     private static void writeObj(Person p, File f) {
20         ObjectOutputStream oos=null;
21         try {
22             oos=new ObjectOutputStream(new FileOutputStream(f));
23             oos.writeObject(p);
24         } catch (IOException e) {
25             throw new RuntimeException("对象写入失败");
26         }
27         finally{
28             try {
29                 if(oos!=null)
30                     oos.close();
31             } catch (Exception e2) {
32                 throw new RuntimeException("关流失败");
33             }            
34         }
35     }
36 //读取
37     private static void readObj(File f) {
38         ObjectInputStream ois=null;
39         try {
40             ois=new ObjectInputStream(new FileInputStream(f));
41             Person p=(Person)ois.readObject();
42             System.out.println(p);
43         } catch (Exception e) {
44             // TODO: handle exception
45         }
46         finally{
47             try {
48                 if(ois!=null)
49                     ois.close();
50             } catch (Exception e3) {
51                 throw new RuntimeException("关流失败");
52             }            
53         }
54         
55     }
56     //    视频读取
57     public static void readObj()throws IOException, ClassNotFoundException{        
58         ObjectInputStream ois=
59                 new ObjectInputStream(new FileInputStream("D:\\sy.txt"));
60         Person p=(Person)ois.readObject();
61         System.out.println(p);
62         ois.close();
63     }
64     
65 //    视频方法存储
66     public static void writeObj()throws IOException{
67             
68         ObjectOutputStream oos=
69                 new ObjectOutputStream(new FileOutputStream("D:\\sy.txt"));
70         oos.writeObject(new Person("水音",24,"kr"));
71         oos.writeObject(new Person("水音",25));
72         oos.close();
73     }
74 }
75 
76 //创建类
77 class Person implements Serializable{//必须实现这个才能被序列化
78     public static final long serialVersionUId=42L;//给他固定一个撮
79     
80     private String name;
81     transient int age;//使用transient后就不能被序列化
82     static String country="cn";//静态也不能序列化
83     Person(String name,int age,String country){
84         this.name=name;
85         this.age=age;
86         this.country=country;
87     }
88     public String toString(){
89         return name+"="+age+"="+country;
90     }    
91 }