ByteArrayInputStream(byte[] buf);
ByteArrayInputStream(byte[] buf,int offset,int length );

import java.io.ByteArrayInputStream;
import java.io.IOException;

public class TestByteArrayInputStream {
 public static void main(String[] args) throws IOException {
  // 初始化字节数组
  byte[] buf = new byte[3];
  buf[0] = 100;
  buf[1] = 101;
  buf[2] = 102;
  // 创建输入流
  ByteArrayInputStream input = new ByteArrayInputStream(buf);
  // 从输入流中读取数据
  byte[] out = new byte[3];
  input.read(out);
  System.out.println(new String(out));
  // 关闭输入流
  input.close();

 }
}

FileInputStream(File file);//通过系统中的File对象file指定
FileInputStream(String name);//通过系统中路径名name指定同样的我们使用重写的InputStream中的方法的名称来实现读文件内容。

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

public class TestFileInputStream {
 public static void main(String[] args) throws FileNotFoundException {
  try {
   // 创建输入流
   FileInputStream input = new FileInputStream("D:/demo/test.txt");
   // 从输入流中读取数据
   while (input.available() > 0) {
    int out = input.read();
    System.out.println((char) out);
   }
   // 关闭输入流
   input.close();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }
}

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.sql.Date;

public class TestObjectInputStream {
 public static void main(String[] args) throws ClassNotFoundException {
  try {
   // 创建文件输入流
   FileInputStream file = new FileInputStream("D:/demo?test.tmp");
   // 创建对象输入流
   ObjectInputStream object = new ObjectInputStream(file);
   // 读取对象的数据
   int i = object.readInt();
   String string = (String) object.readObject();
   Date date = (Date) object.readObject();
   System.out.println("i=" + i);
   System.out.println("string=" + string);
   System.out.println("date=" + date);
   // 关闭流
   object.close();
   file.close();
  } catch (FileNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

 }
}

StringBufferInputStream(String s); //以从指定字符串读取数据

import java.io.IOException;
import java.io.StringBufferInputStream;

public class TestStringBufferInputStream {
 public static void main(String[] args) {
  // 创建输入流
  StringBufferInputStream input = new StringBufferInputStream("Hello World!");
  // 从输入流中读取数据
  while (input.available() > 0) {
   int out = input.read();
   System.out.print((char) out);
  }
  // 关闭输入流
  try {
   input.close();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
}

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

public class TestBufferedInputStream {
 private void mian() {
  // TODO Auto-generated method stub
  try {
   // 创建文件输入流
   FileInputStream input = new FileInputStream("D:/demo/test.txt");
   BufferedInputStream buffer = new BufferedInputStream(input);
   // 从输入流中读取数据
   while (buffer.available() > 0) {
    int out = buffer.read();
    System.out.print((char) out);
   }
   // 关闭流
   buffer.close();
   input.close();
  } catch (FileNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

 }
}