从键盘获取输入System.in、InputStream、InputStreamReader、BufferReader

package com.zeph.systemin;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class TestSystemIn {
	public static void main(String[] args) {
		InputStream is = System.in;
		InputStreamReader isr = new InputStreamReader(is);
		BufferedReader br = new BufferedReader(isr);
		try {
			String str = null;
			while (!(str = br.readLine()).equals("")) {
				System.out.println(str);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		try {
			br.close();
			isr.close();
			is.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}