**Apache Commons IO - TeeOutputStream**

TeeOutputStream 分支 OutputStream。它以 unix“tee”命令命名。它允许一个流分支为两个流。

**类声明**

以下是 org.apache.commons.io.output.TeeOutputStream 类的声明：

public class TeeOutputStream
   extends ProxyOutputStream

**TeeOutputStream 类示例**

在此示例中，TeeOutputStream 接受两个输出流作为参数，并将数据传递给 TeeOutputStream 来设置数据到两个输出流。

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**

以下是打印结果：

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