Apache Commons IO - TeeInputStream

它是一个 InputStream 代理，它将从代理流中读取的所有字节的副本透明地写入给定的 OutputStream。 当调用此代理上的 close() 方法时，代理输入流将关闭。 它可用于一次共同操作两个流。

类声明

以下是 org.apache.commons.io.input.TeeInputStream 类的声明 −

public class TeeInputStream
   extends ProxyInputStream

TeeInputStream 类示例

在此示例中，关闭 TeeInputStream 会关闭 TeeInputStream 以及 TeeOutputStream 对象。

IOTester.java

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import org.apache.commons.io.input.TeeInputStream;
import org.apache.commons.io.output.TeeOutputStream;
public class IOTester {
   private static final String SAMPLE = "Welcome to TutorialsPoint. Simply Easy
   Learning.";
   public static void main(String[] args) {
      try {
         usingTeeInputStream();
      }catch(IOException e) {
         System.out.println(e.getMessage());
      }
   }
   public static void usingTeeInputStream() throws IOException {
      TeeInputStream teeInputStream = null;
      TeeOutputStream teeOutputStream = null;
      try {
         ByteArrayInputStream inputStream = new
         ByteArrayInputStream(SAMPLE.getBytes("US-ASCII"));
         ByteArrayOutputStream outputStream1 = new ByteArrayOutputStream();
         ByteArrayOutputStream outputStream2 = new ByteArrayOutputStream();
         teeOutputStream = new TeeOutputStream(outputStream1, outputStream2);
         teeInputStream = new TeeInputStream(inputStream, teeOutputStream, true);
         teeInputStream.read(new byte[SAMPLE.length()]);
         System.out.println("Output stream 1: " + outputStream1.toString());
         System.out.println("Output stream 2: " + outputStream2.toString());
      }catch (IOException e) {
         System.out.println(e.getMessage());
      } finally {
         //teeIn.close() closes teeIn and teeOut which in turn closes the out1 and out2.
         try {
            teeInputStream.close();
         } catch (IOException e) {
            System.out.println(e.getMessage());
         }
      }
   }
}

输出

它将打印以下结果。

Output stream 1: Welcome to TutorialsPoint. Simply Easy Learning.
Output stream 2: Welcome to TutorialsPoint. Simply Easy Learning.