inputStream如何实现流复制呢?

实现思路:
   1.将InputStream 转化成 ByteArrayOutputStream
   2.另一个InputStream将ByteArrayOutputStream转换回来即可

package com.java265;
 
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("D:\\test01.txt"); 
        //InputStream input =  httpconn.getInputStream(); //这里可以写获取到的流
        
        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;
        }
    }
}