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Java example source code file (PlainSocketFactory.java)

This example source code file (PlainSocketFactory.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

connecttimeoutexception, default_factory, hostnameresolver, httpparams, illegalargumentexception, inetaddress, inetsocketaddress, io, ioexception, net, network, parameters, plainsocketfactory, socket, sockettimeoutexception, string, target

The PlainSocketFactory.java example source code

 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *   http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.

package org.apache.http.conn.scheme;

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketTimeoutException;

import org.apache.http.annotation.Immutable;

import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;

 * The default class for creating plain (unencrypted) sockets.
 * <p>
 * The following parameters can be used to customize the behavior of this 
 * class: 
 * <ul>
 *  <li>{@link org.apache.http.params.CoreConnectionPNames#CONNECTION_TIMEOUT}
 * </ul>
 * @since 4.0
public final class PlainSocketFactory implements SocketFactory {

     * The default factory.
    private static final
        PlainSocketFactory DEFAULT_FACTORY = new PlainSocketFactory();

    private final HostNameResolver nameResolver;
     * Gets the default factory. Usually there should be no reason for creating 
     * multiple instances of this class.
     * @return the default factory
    public static PlainSocketFactory getSocketFactory() {
        return DEFAULT_FACTORY;

    public PlainSocketFactory(final HostNameResolver nameResolver) {
        this.nameResolver = nameResolver;

    public PlainSocketFactory() {

    public Socket createSocket() {
        return new Socket();

    public Socket connectSocket(Socket sock, String host, int port, 
                                InetAddress localAddress, int localPort,
                                HttpParams params)
        throws IOException {

        if (host == null) {
            throw new IllegalArgumentException("Target host may not be null.");
        if (params == null) {
            throw new IllegalArgumentException("Parameters may not be null.");

        if (sock == null)
            sock = createSocket();

        if ((localAddress != null) || (localPort > 0)) {

            // we need to bind explicitly
            if (localPort < 0)
                localPort = 0; // indicates "any"

            InetSocketAddress isa =
                new InetSocketAddress(localAddress, localPort);

        int timeout = HttpConnectionParams.getConnectionTimeout(params);

        InetSocketAddress remoteAddress;
        if (this.nameResolver != null) {
            remoteAddress = new InetSocketAddress(this.nameResolver.resolve(host), port); 
        } else {
            remoteAddress = new InetSocketAddress(host, port);            
        try {
            sock.connect(remoteAddress, timeout);
        } catch (SocketTimeoutException ex) {
            throw new ConnectTimeoutException("Connect to " + remoteAddress + " timed out");
        return sock;

     * Checks whether a socket connection is secure.
     * This factory creates plain socket connections
     * which are not considered secure.
     * @param sock      the connected socket
     * @return  <code>false
     * @throws IllegalArgumentException if the argument is invalid
    public final boolean isSecure(Socket sock)
        throws IllegalArgumentException {

        if (sock == null) {
            throw new IllegalArgumentException("Socket may not be null.");
        // This check is performed last since it calls a method implemented
        // by the argument object. getClass() is final in java.lang.Object.
        if (sock.isClosed()) {
            throw new IllegalArgumentException("Socket is closed.");
        return false;


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