三十八毒

忘了是那里抄来的,还是自己写的,反正需要的时候直接拿来用,很方便.
我的工具类已经攒了N多,今天帖出一点点和大家共享,呵呵.
(java中流事件的几个例子,可以演示java如何从键盘或文件中读出数据及把数据写入文件等)

import java.io.*;

public class IOStreamDemo {

	public void samples() throws IOException {
		// 从键盘读入一行数据,返回字符串
		BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
		System.out.println(stdin.readLine());

		// 从文件中逐行读入数据

		BufferedReader in = new BufferedReader(new FileReader(
				"IOStreamDemo.java"));
		String s, s2 = new String();
		while ((s = in.readLine()) != null)
			s2 += s + "\n";
		in.close();

		// 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);

		// 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("IODemo.out")));
			int lineCount = 1;
			while ((s = in2.readLine()) != null)
				out1.println(lineCount++ + ": " + s);
			out1.close();
		} catch (EOFException e) {
			System.err.println("End of stream");
		}
	}
}