Java实现inputstream流的复制代码实例

package com.test;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
public class StreamOperateUtil {
	public static void main(String[] args) throws FileNotFoundException {
		InputStream input = new FileInputStream("c:\test.txt");
		//InputStream input = httpconn.getInputStream(); //这里可以写你获取到的流
		ByteArrayOutputStream baos = cloneInputStream(input);
		// 打开两个新的输入流 
		InputStream stream1 = new ByteArrayInputStream(baos.toByteArray());
		InputStream stream2 = new ByteArrayInputStream(baos.toByteArray());
	}
	private static ByteArrayOutputStream cloneInputStream(InputStream input) {
		try {
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			byte[] buffer = new byte[1024];
			int len;
			while ((len = input.read(buffer)) > -1) {
				baos.write(buffer, 0, len);
			}
			baos.flush();
			return baos;
		}
		catch (IOException e) {
			e.printStackTrace();
			return null;
		}
	}
}