fileinputstreamdemo.java

java入门经典教程 java入门经典教程 java入门经典教程

// 例5.3.1 FileInputStreamDemo.java
import java.io.*;
class FileInputStreamDemo 
{
	public static void print(String str)
	{
		System.out.println(str);
	}
	public static void main(String[] args) 
	{
		try
		{
			File file = new File("data.txt");
			FileInputStream fIn = new FileInputStream(file);
			if (file.isFile())  // 测试当前对象是否是文件
			{
				print("File Location: "+file.getAbsolutePath());
				if (file.canRead())  // 测试当前文件对象是否可读
				{
					print("File can be read");
					try
					{
						while(fIn.available()>0)  // 判断文件是否读完
						{
							System.out.print((char)fIn.read());
						}
						System.out.println();
						fIn.close();    // 关闭文件输入流
					}catch(IOException e){
						System.out.println(e);	
					}
				}
				else
					print("File can not be read");
			}
			else
				print("This is not a file!");
		}catch(FileNotFoundException e){
			System.out.println(e);
		}
	}
}