Java example source code file (HttpExchange.java)

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

Learn more about this Java project at its project page.

Java - Java tags/keywords

httpcontext, httpexchange, inetsocketaddress, inputstream, ioexception, list, map, net, network, outputstream, principal, request_cipher_suite, request_key_size, request_x509certificate, security, set, string, util

The HttpExchange.java Java example source code

/*
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javax.xml.ws.spi.http;

import javax.xml.ws.handler.MessageContext;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.security.Principal;

/**
 * This class encapsulates a HTTP request received and a
 * response to be generated in one exchange. It provides methods
 * for examining the request from the client, and for building and
 * sending the response.
 * <p>
 * A <code>HttpExchange must be closed to free or reuse
 * underlying resources. The effect of failing to close an exchange
 * is undefined.
 *
 * @author Jitendra Kotamraju
 * @since JAX-WS 2.2
 */
public abstract class HttpExchange {

    /**
     * Standard property: cipher suite value when the request is received
     * over HTTPS
     * <p>Type: String
     */
    public static final String REQUEST_CIPHER_SUITE =
            "javax.xml.ws.spi.http.request.cipher.suite";

    /**
     * Standard property: bit size of the algorithm when the request is
     * received over HTTPS
     * <p>Type: Integer
     */
    public static final String REQUEST_KEY_SIZE =
            "javax.xml.ws.spi.http.request.key.size";

    /**
     * Standard property: A SSL certificate, if any, associated with the request
     *
     * <p>Type: java.security.cert.X509Certificate[]
     * The order of this array is defined as being in ascending order of trust.
     * The first certificate in the chain is the one set by the client, the next
     * is the one used to authenticate the first, and so on.
     */
    public static final String REQUEST_X509CERTIFICATE =
            "javax.xml.ws.spi.http.request.cert.X509Certificate";

    /**
     * Returns an immutable Map containing the HTTP headers that were
     * included with this request. The keys in this Map will be the header
     * names, while the values will be a List of Strings containing each value
     * that was included (either for a header that was listed several times,
     * or one that accepts a comma-delimited list of values on a single line).
     * In either of these cases, the values for the header name will be
     * presented in the order that they were included in the request.
     * <p>
     * The keys in Map are case-insensitive.
     *
     * @return an immutable Map which can be used to access request headers
     */
    public abstract Map<String, List getRequestHeaders();

    /**
     * Returns the value of the specified request header. If the request
     * did not include a header of the specified name, this method returns
     * null. If there are multiple headers with the same name, this method
     * returns the first header in the request. The header name is
     * case-insensitive. This is a convienence method to get a header
     * (instead of using the {@link #getRequestHeaders}).
     *
     * @param name the name of the request header
     * @return returns the value of the requested header,
     *         or null if the request does not have a header of that name
     */
     public abstract String getRequestHeader(String name);

    /**
     * Returns a mutable Map into which the HTTP response headers can be stored
     * and which will be transmitted as part of this response. The keys in the
     * Map will be the header names, while the values must be a List of Strings
     * containing each value that should be included multiple times
     * (in the order that they should be included).
     * <p>
     * The keys in Map are case-insensitive.
     *
     * @return a mutable Map which can be used to set response headers.
     */
    public abstract Map<String, List getResponseHeaders();

    /**
     * Adds a response header with the given name and value. This method
     * allows a response header to have multiple values. This is a
     * convenience method to add a response header(instead of using the
     * {@link #getResponseHeaders()}).
     *
     * @param name the name of the header
     * @param value the additional header value. If it contains octet string,
     *        it should be encoded according to
     *        RFC 2047 (http://www.ietf.org/rfc/rfc2047.txt)
     *
     * @see #getResponseHeaders
     */
    public abstract void addResponseHeader(String name, String value);

    /**
     * Returns the part of the request's URI from the protocol
     * name up to the query string in the first line of the HTTP request.
     * Container doesn't decode this string.
     *
     * @return the request URI
     */
    public abstract String getRequestURI();

    /**
     * Returns the context path of all the endpoints in an application.
     * This path is the portion of the request URI that indicates the
     * context of the request. The context path always comes first in a
     * request URI. The path starts with a "/" character but does not
     * end with a "/" character. If this method returns "", the request
     * is for default context. The container does not decode this string.
     *
     * <p>
     * Context path is used in computing the endpoint address. See
     * {@link HttpContext#getPath}
     *
     * @return context path of all the endpoints in an application
     * @see HttpContext#getPath
     */
    public abstract String getContextPath();

    /**
     * Get the HTTP request method
     *
     * @return the request method
     */
    public abstract String getRequestMethod();

    /**
     * Returns a {@link HttpContext} for this exchange.
     * Container matches the request with the associated Endpoint's HttpContext
     *
     * @return the HttpContext for this exchange
     */
    public abstract HttpContext getHttpContext();

    /**
     * This must be called to end an exchange. Container takes care of
     * closing request and response streams. This must be called so that
     * the container can free or reuse underlying resources.
     *
     * @throws IOException if any i/o error
     */
    public abstract void close() throws IOException;

    /**
     * Returns a stream from which the request body can be read.
     * Multiple calls to this method will return the same stream.
     *
     * @return the stream from which the request body can be read.
     * @throws IOException if any i/o error during request processing
     */
    public abstract InputStream getRequestBody() throws IOException;

    /**
     * Returns a stream to which the response body must be
     * written. {@link #setStatus}) must be called prior to calling
     * this method. Multiple calls to this method (for the same exchange)
     * will return the same stream.
     *
     * @return the stream to which the response body is written
     * @throws IOException if any i/o error during response processing
     */
    public abstract OutputStream getResponseBody() throws IOException;

    /**
     * Sets the HTTP status code for the response.
     *
     * <p>
     * This method must be called prior to calling {@link #getResponseBody}.
     *
     * @param status the response code to send
     * @see #getResponseBody
     */
    public abstract void setStatus(int status);

    /**
     * Returns the unresolved address of the remote entity invoking
     * this request.
     *
     * @return the InetSocketAddress of the caller
     */
    public abstract InetSocketAddress getRemoteAddress();

    /**
     * Returns the unresolved local address on which the request was received.
     *
     * @return the InetSocketAddress of the local interface
     */
    public abstract InetSocketAddress getLocalAddress();

    /**
     * Returns the protocol string from the request in the form
     * <i>protocol/majorVersion.minorVersion. For example,
     * "HTTP/1.1"
     *
     * @return the protocol string from the request
     */
    public abstract String getProtocol();

    /**
     * Returns the name of the scheme used to make this request,
     * for example: http, or https.
     *
     * @return name of the scheme used to make this request
     */
    public abstract String getScheme();

    /**
     * Returns the extra path information that follows the web service
     * path but precedes the query string in the request URI and will start
     * with a "/" character.
     *
     * <p>
     * This can be used for {@link MessageContext#PATH_INFO}
     *
     * @return decoded extra path information of web service.
     *         It is the path that comes
     *         after the web service path but before the query string in the
     *         request URI
     *         <tt>null if there is no extra path in the request URI
     */
    public abstract String getPathInfo();

    /**
     * Returns the query string that is contained in the request URI
     * after the path.
     *
     * <p>
     * This can be used for {@link MessageContext#QUERY_STRING}
     *
     * @return undecoded query string of request URI, or
     *         <tt>null if the request URI doesn't have one
     */
    public abstract String getQueryString();

    /**
     * Returns an attribute that is associated with this
     * <code>HttpExchange. JAX-WS handlers and endpoints may then
     * access the attribute via {@link MessageContext}.
     * <p>
     * Servlet containers must expose {@link MessageContext#SERVLET_CONTEXT},
     * {@link MessageContext#SERVLET_REQUEST}, and
     * {@link MessageContext#SERVLET_RESPONSE}
     * as attributes.
     *
     * <p>If the request has been received by the container using HTTPS, the
     * following information must be exposed as attributes. These attributes
     * are {@link #REQUEST_CIPHER_SUITE}, and {@link #REQUEST_KEY_SIZE}.
     * If there is a SSL certificate associated with the request, it must
     * be exposed using {@link #REQUEST_X509CERTIFICATE}
     *
     * @param name attribute name
     * @return the attribute value, or <tt>null if the attribute doesn't
     *         exist
     */
    public abstract Object getAttribute(String name);

    /**
     * Gives all the attribute names that are associated with
     * this <code>HttpExchange.
     *
     * @return set of all attribute names
     * @see #getAttribute(String)
     */
    public abstract Set<String> getAttributeNames();

    /**
     * Returns the {@link Principal} that represents the authenticated
     * user for this <code>HttpExchange.
     *
     * @return Principal for an authenticated user, or
     *         <tt>null if not authenticated
     */
    public abstract Principal getUserPrincipal();

    /**
     * Indicates whether an authenticated user is included in the specified
     * logical "role".
     *
     * @param role specifies the name of the role
     * @return <tt>true if the user making this request belongs to a
     *         given role
     */
    public abstract boolean isUserInRole(String role);

}