streamexample.java

jsp动态网站开发技术与实践 电子工业出版社 随书附赠源代码

import java.io.*;

public class StreamExample 
{

	public static void main(String[] args) throws IOException 
	{
		/* 从键盘读入一行数据，返回的是一个字符串 */
		BufferedReader stdin =new BufferedReader(new InputStreamReader(System.in)); 
		System.out.print("Enter a line:");
		System.out.println(stdin.readLine());
	
		/* 这是从文件中逐行读入数据 */
		BufferedReader in = new BufferedReader(new FileReader("StreamExample.java"));
		String s, s2 = new String();
		while((s = in.readLine())!= null)
		{
			s2 += s + "\n";
		}	
		in.close();	
	
		/* 这是从一个字符串中逐个读入字节 */
		StringReader in1 = new StringReader(s2);
		int c;		
		while((c = in1.read()) != -1)
		{
			System.out.print((char)c);
		}	

		/* 这是将一个字符串写入文件 */
		try 
		{
			BufferedReader in2 = new BufferedReader(new StringReader(s2));
			PrintWriter out1 = new PrintWriter(new BufferedWriter(new FileWriter("StreamExample.out")));
			int lineCount = 1;
			while((s = in2.readLine()) != null )
			{
				out1.println(lineCount++ + ": " + s);
			}			
			
			out1.close();
		} catch(EOFException e) 
		{
			System.err.println("流操作非法结束！");
		}
	} 

}