- Apache Commons IO Tutorial
- Apache Commons IO - Home
- Apache Commons IO - Overview
- Apache Commons IO - Environment Setup
- Apache Commons IO - IOUtils
- Apache Commons IO - FileUtils
- Apache Commons IO - FilenameUtils
- Apache Commons IO - FileSystemUtils
- Apache Commons IO - IOCase
- Apache Commons IO - LineIterator
- Apache Commons IO - NameFileFilter
- Apache Commons IO - WildcardFileFilter
- Apache Commons IO - SuffixFileFilter
- Apache Commons IO - PrefixFileFilter
- Apache Commons IO - OrFileFilter
- Apache Commons IO - AndFileFilter
- Apache Commons IO - FileEntry
- Apache Commons IO - FileAlterationObserver
- Apache Commons IO - FileAlterationMonitor
- Apache Commons IO - NameFileComparator
- Apache Commons IO - SizeFileComparator
- LastModifiedFileComparator
- Apache Commons IO - TeeInputStream
- Apache Commons IO - TeeOutputStream
- Apache Commons IO - Useful Resources
- Apache Commons IO - Quick Guide
- Apache Commons IO - Useful Resources
- Apache Commons IO - Discussion
Apache Commons IO - TeeInputStream
It is an InputStream proxy that transparently writes a copy of all bytes which are read from the proxy stream to a given OutputStream. The proxy input stream is closed, when the close() method on this proxy is called. It can be used to operate two streams collectively at a time.
Class Declaration
Following is the declaration for org.apache.commons.io.input.TeeInputStream Class −
public class TeeInputStream extends ProxyInputStream
Example of TeeInputStream Class
In this example, closing a TeeInputStream closes the TeeInputStream as well as the TeeOutputStream objects.
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()); } } } }
Output
It will print the following result.
Output stream 1: Welcome to TutorialsPoint. Simply Easy Learning. Output stream 2: Welcome to TutorialsPoint. Simply Easy Learning.
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