其他流总述

1.转换流

InputStreamReader: 把InputStream转换为Reader，可以指定编码表
OutputStreamWriter: 把OutputStream转换为Writer，可以指定编码表

//转换流[用于指定编码表读入或写出]
public class Demo1 {public static void main(String[] args) throws IOException {//jdk11以前使用转化流[按照指定的编码表，将字节流转化为字符流]method1();//jdk11之后提供了字符流指定编码表//Charset.forName()封装指定编码表//method2();}private static void method1() throws IOException {//1.创建转化输入输出流对象InputStreamReader isr = new InputStreamReader(new FileInputStream("day12_myIoOtherStream\\a.txt"), "gbk");OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("day12_myIoOtherStream\\c.txt"), "utf-8");char []chars =new char[1024];int len = isr.read(chars);//2.边读边写while (len!=-1){osw.write(chars,0,len);len = isr.read(chars);}//3.释放资源isr.close();osw.close();}private static void method2() throws IOException {//1.创建字符输入输出流对象FileReader fr = new FileReader("day12_myIoOtherStream\\a.txt", Charset.forName("GBK"));FileWriter fw = new FileWriter("day12_myIoOtherStream\\b.txt", Charset.forName("utf-8"));char []chars =new char[1024];int len = fr.read(chars);//2.边读边写while (len!=-1){fw.write(chars,0,len);len = fr.read(chars);}//3.释放资源fr.close();fw.close();}
}
打印结果：
------------------------------------------------------------------------------------------------
a.txt:我爱中国
b.txt:我爱中国
c.txt:�Ұ��й�

2.对象流【隐藏对象不能被直接读取】

ObjectInputStream: 读取对象的
ObjectOutputStream: 写入对象

//对象操作流（序列化流）----------做了解
//objectOutputStream 序列化流 ；写对象
//objectInputStream 反序列化流 ；读对象
public class Demo1 {public static void main(String[] args) throws IOException, ClassNotFoundException {User user = new User("zhangsan", "123456");//把对象写到文件中去【序列化】
//        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("day12_myIoOtherStream\\d.txt"));
//        oos.writeObject(user);
//        oos.close();//从文件中读取对象【反序列化】ObjectInputStream ois = new ObjectInputStream(new FileInputStream("day12_myIoOtherStream\\d.txt"));Object o = ois.readObject();System.out.println(o);}
}//用户类
//Serializable 标记接口，表示可被序列化
public class User implements Serializable {private String name;private String password;//防止序列化前后属性变更，可固定序列号解决报错//代码可在String源码中复制private static final long serialVersionUID = 67710L;public User(String name, String password) {this.name = name;this.password = password;}//标准的Javabean类（get、set方法）@Overridepublic String toString() {return "User{" +"name='" + name + '\'' +", password='" + password + '\'' +'}';}
}打印结果：
----------------------------------------------------------------------------
d.txt:�� sr com.itheima.objectStream.User     ~ L namet Ljava/lang/String;L passwordq ~ xpt zhangsant 123456
控制台：User{name='zhangsan', password='123456'}

3.标准的输入输出流【面试】

System.in: 标准的输入流，读取键盘录入的数据
System.out: 标准的输出流，往控制台输出数据

//标准输入输出流【扩展内容，打印和键盘录入底层原理】
public class Demo1 {public static void main(String[] args) throws IOException {//System.in:标准的输入流，读取键盘录入的数据[InputStream]//Scanner是对其的包装，增加了对数据的操作//method1();//System.out:标准的输出流,往控制台输出数据//print底层用的输出流就是PrintStream 父类为[FilterOutputStream]method2();}private static void method2() throws IOException {PrintStream out = System.out;//把字节流转化为字节流[转化流]OutputStreamWriter osw = new OutputStreamWriter(out);//把字符流包装成缓冲流BufferedWriter bw = new BufferedWriter(osw);//向控制台输出数据bw.write("asd");//释放资源bw.close();}private static void method1() throws IOException {Scanner sc = new Scanner(System.in);//自定义[键盘录入]InputStream in = System.in;//把字节流转化为字节流[转化流]InputStreamReader isr = new InputStreamReader(in);//把字符流包装成缓冲流BufferedReader br = new BufferedReader(isr);//读取键盘录入的数据String s = br.readLine();System.out.println(s);//关闭流br.close();}
}打印结果：
----------------------------------------------------------------------------
method1:1212
method2: asd