baos bais 意义

import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import org.junit.Test;

public class testIO {
	ByteArrayOutputStream baos = new ByteArrayOutputStream();
	@Test
	public void test1() throws Exception {
		Process exec = Runtime.getRuntime().exec("ipconfig");
		InputStream inputStream = exec.getInputStream();
		byte[] bytes = new byte[1024];
		int len = 0;
//		ByteArrayInputStream bais = new 

		while((len=inputStream.read(bytes))!=-1) {
//			inputStream.read(bytes);
			baos.write(bytes,0,len);
		}
		baos.flush();

		Thread t1 = new Thread(new Runnable() {
			byte[] temp = new byte[1024];
			byte[] byteArray = baos.toByteArray();
			ByteArrayInputStream bais = new ByteArrayInputStream(byteArray);
			BufferedInputStream bis = new BufferedInputStream(bais);
			int len=0;
			StringBuilder sb = new StringBuilder();
			public void run() {
				// TODO Auto-generated method stub

				try {
					while((len=bis.read(temp))!=-1) {
						sb.append(new String(temp,0,len));
					}
					System.out.println(sb.toString());
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		});
		Thread t2 = new Thread(new Runnable() {
			byte[] temp = new byte[1024];
			byte[] byteArray = baos.toByteArray();
			ByteArrayInputStream bais = new ByteArrayInputStream(byteArray);
			BufferedInputStream bis = new BufferedInputStream(bais);
			int len=0;
			StringBuilder sb = new StringBuilder();
			public void run() {
				// TODO Auto-generated method stub

				try {
					while((len=bis.read(temp))!=-1) {
						sb.append(new String(temp,0,len));
					}
					System.out.println(sb.toString());
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		});

		t1.start();
		t2.start();
	}		

}