将InputStream(Image)转换为ByteArrayInputStream

Question

不确定我应该怎么做.任何帮助,将不胜感激

Answer 1

从输入流读取并写入ByteArrayOutputStream,然后调用它toByteArray()以获取字节数组.

在字节数组周围创建一个ByteArrayInputStream以从中读取.

这是一个快速测试:

import java.io.*;

public class Test {


       public static void main(String[] arg) throws Throwable {
          File f = new File(arg[0]);
          InputStream in = new FileInputStream(f);

          byte[] buff = new byte[8000];

          int bytesRead = 0;

          ByteArrayOutputStream bao = new ByteArrayOutputStream();

          while((bytesRead = in.read(buff)) != -1) {
             bao.write(buff, 0, bytesRead);
          }

          byte[] data = bao.toByteArray();

          ByteArrayInputStream bin = new ByteArrayInputStream(data);
          System.out.println(bin.available());
       }
}

Answer 2

您可以使用 org.apache.commons.io。IOUtils#toByteArray (java.io.InputStream)

InputStream is = getMyInputStream();
ByteArrayInputStream bais = new ByteArrayInputStream(IOUtils.toByteArray(is));