Java中其他的IO流

1、ObjectInputStream和ObjectOutputStream

ObjectInputStream和ObjectOutputStream分别与FileInputStream和FileOutputStream一起使用时，可以为应用程序提供对对象的持久存储。我们把对象以某种特定的编码格式写入称之为“序列化”。把写入的编码格式内容还原成对象称之为“反序列化”。被序列化的对象必须实现Serializable接口。

package com.iotek.otherio;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class ObjectInputOutputDemo {

    public static void main(String[] args) throws IOException {
        /*Student student = new Student("zhangsan", 30);
        FileOutputStream fos = new FileOutputStream("f:\\test\\1.txt");
        ObjectOutputStream objectOutputStream = new ObjectOutputStream(fos);
        objectOutputStream.writeObject(student);//把对象序列化到指定的文件输出流中
        objectOutputStream.close();//释放资源*/    

        ObjectInputStream objectInputStream = new ObjectInputStream(new FileInputStream("f:\\test\\1.txt"));
        try {
            Student student = (Student)objectInputStream.readObject();
            System.out.println(student);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}

class Student implements Serializable{//需要实现Serializable接口

    private static final long serialVersionUID = 1L;
    private String name;
    private int age;

    public Student(String name, int age) {
        super();
        this.name = name;
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    @Override
    public String toString() {
        return "Student [name=" + name + ", age=" + age + "]";
    }
}

2、InputStreamReader和OutputStreamWriter

转换流是指将字节流与字符流之间进行转换。转换流的出现方便了对文件的读写，它在字符流与字节流之间架起了一座桥梁，使原本毫无关联的两种操作能够进行转化，提高了程序的灵活性。字节流中的数据都是字符时，转化成字符流操作更高效。如果使用非默认编码保存文件或者读取文件时，需要用到转换流，因为字节流的重载构造方法中有指定编码格式的参数，而FileReader与FileWriter是默认编码的文本文件。

package com.iotek.otherio;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class InputStreamWriterReaderDemo {

    public static void main(String[] args) throws IOException {
        /*OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("f:\\test\\2.txt"), "utf-8");
        BufferedWriter bw = new BufferedWriter(osw);
        bw.write("您好");
        bw.close();*/

        /*BufferedReader br = new BufferedReader(new FileReader("f:\\test\\2.txt"));
        String line = null;
        while((line = br.readLine())!=null){
            System.out.println(line);
        }
        br.close();*/

        BufferedReader bReader = new BufferedReader(new InputStreamReader(new FileInputStream("f:\\test\\2.txt"),"utf-8"));
        String line = null;
        while((line = bReader.readLine())!=null){
            System.out.println(line);
        }
        bReader.close();
    }
}