Examples of java.util.logging.SocketHandler

java.util.logging.SocketHandler
Simple network logging Handler.
LogRecords are published to a network stream connection. By default the XMLFormatter class is used for formatting.
Configuration: By default each SocketHandler is initialized using the following LogManager configuration properties. If properties are not defined (or have invalid values) then the specified default values are used.
- java.util.logging.SocketHandler.level specifies the default level for the Handler (defaults to Level.ALL).
- java.util.logging.SocketHandler.filter specifies the name of a Filter class to use (defaults to no Filter).
- java.util.logging.SocketHandler.formatter specifies the name of a Formatter class to use (defaults to java.util.logging.XMLFormatter).
- java.util.logging.SocketHandler.encoding the name of the character set encoding to use (defaults to the default platform encoding).
- java.util.logging.SocketHandler.host specifies the target host name to connect to (no default).
- java.util.logging.SocketHandler.port specifies the target TCP port to use (no default).
The output IO stream is buffered, but is flushed after each LogRecord is written. @version 1.19, 11/17/05 @since 1.4

  implements Testlet
{
  public void test(TestHarness th)
  {
    SocketCapturer capturer;
    SocketHandler handler;
    String captured = null;


    // Check #1.
    try
      {
        capturer = new SocketCapturer(0);
        handler = new SocketHandler("0.0.0.0", capturer.getLocalPort());
        handler.setLevel(Level.FINE);
        handler.publish(new LogRecord(Level.CONFIG, "hello, world"));
        handler.publish(new LogRecord(Level.FINER, "how are you?"));
        handler.close();
        captured = new String(capturer.getCaptured());
        th.check(true);
      }
    catch (Exception ex)
      {

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public class getFilter
  implements Testlet
{
  public void test(TestHarness th)
  {
    SocketHandler handler;


    // Check #1.
    try
      {
        ServerSocket socket = new ServerSocket(0);
        handler = new SocketHandler("0.0.0.0", socket.getLocalPort());
        socket.close();
        th.check(handler.getFilter() == null);
      }
    catch (Exception ex)
      {
        th.check(false);
        th.debug(ex);

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public class getFormatter
  implements Testlet
{
  public void test(TestHarness th)
  {
    SocketHandler handler;


    // Check #1.
    try
      {
        ServerSocket socket = new ServerSocket(0);
        handler = new SocketHandler("0.0.0.0", socket.getLocalPort());
        socket.close();
        th.check(handler.getFormatter() instanceof XMLFormatter);
      }
    catch (Exception ex)
      {
        th.check(false);
        th.debug(ex);

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    // start the server to be ready to accept log messages
    ServerThread thread = new ServerThread();
    thread.start();
    Thread.sleep(2000);


    h = new SocketHandler();
    h.setLevel(Level.INFO);


    SecurityManager oldMan = System.getSecurityManager();
    System.setSecurityManager(new MockSecurityManager());
    try {

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    // start the server to be ready to accept log messages
    ServerThread thread = new ServerThread();
    thread.start();
    Thread.sleep(2000);


    h = new SocketHandler();
    h.setLevel(Level.INFO);


    LogRecord r = new LogRecord(Level.INFO, "testPublish_NoFilter");
    h.setLevel(Level.INFO);
    h.publish(r);

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    // start the server to be ready to accept log messages
    ServerThread thread = new ServerThread();
    thread.start();
    Thread.sleep(2000);
    h = new SocketHandler();
    h.setLevel(Level.INFO);
    h.setFilter(new MockFilter());


    System.setErr(new PrintStream(new ByteArrayOutputStream()));

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    // start the server to be ready to accept log messages
    ServerThread thread = new ServerThread();
    thread.start();
    Thread.sleep(2000);
    h = new SocketHandler();
    h.setLevel(Level.INFO);
    try {
      h.publish(null);
    } finally {
      h.close();

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    // start the server to be ready to accept log messages
    ServerThread thread = new ServerThread();
    thread.start();
    Thread.sleep(2000);
    h = new SocketHandler();
    h.setLevel(Level.INFO);
    LogRecord r = new LogRecord(Level.INFO, "");
    h.publish(r);
    h.close();
    assertEquals("MockFormatter_Head" + "MockFormatter_Tail", thread

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    // start the server to be ready to accept log messages
    ServerThread thread = new ServerThread();
    thread.start();
    Thread.sleep(2000);
    h = new SocketHandler();
    h.setLevel(Level.INFO);
    LogRecord r = new LogRecord(Level.INFO, null);
    h.publish(r);
    h.close();
    assertEquals("MockFormatter_Head" + "MockFormatter_Tail", thread

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    // start the server to be ready to accept log messages
    ServerThread thread = new ServerThread();
    thread.start();
    Thread.sleep(2000);
    h = new SocketHandler();
    h.setLevel(Level.FINE);


    assertSame(h.getLevel(), Level.FINE);
    LogRecord r = new LogRecord(Level.INFO, "testPublish_NoFormatter");
    assertTrue(h.isLoggable(r));

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