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HttpServlet.java

/**
 *
 * Copyright 2003-2004 The Apache Software Foundation
 *
 *  Licensed 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 "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

//
// This source code implements specifications defined by the Java
// Community Process. In order to remain compliant with the specification
// DO NOT add / change / or delete method signatures!
//

package javax.servlet.http;

import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Method;
import java.text.MessageFormat;
import java.util.Enumeration;
import java.util.Locale;
import java.util.ResourceBundle;

import javax.servlet.GenericServlet;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;


/**
 * Provides an abstract class to be subclassed to create
 * an HTTP servlet suitable for a Web site. A subclass of
 * <code>HttpServlet</code> must override at least
 * one method, usually one of these:
 *
 * <ul>
 * <li> <code>doGet</code>, if the servlet supports HTTP GET requests
 * <li> <code>doPost</code>, for HTTP POST requests
 * <li> <code>doPut</code>, for HTTP PUT requests
 * <li> <code>doDelete</code>, for HTTP DELETE requests
 * <li> <code>init</code> and <code>destroy</code>,
 * to manage resources that are held for the life of the servlet
 * <li> <code>getServletInfo</code>, which the servlet uses to
 * provide information about itself
 * </ul>
 *
 * <p>There's almost no reason to override the <code>service</code>
 * method. <code>service</code> handles standard HTTP
 * requests by dispatching them to the handler methods
 * for each HTTP request type (the <code>do</code><i>XXX</i>
 * methods listed above).
 *
 * <p>Likewise, there's almost no reason to override the
 * <code>doOptions</code> and <code>doTrace</code> methods.
 *
 * <p>Servlets typically run on multithreaded servers,
 * so be aware that a servlet must handle concurrent
 * requests and be careful to synchronize access to shared resources.
 * Shared resources include in-memory data such as
 * instance or class variables and external objects
 * such as files, database connections, and network
 * connections.
 * See the
 * <a href="http://java.sun.com/Series/Tutorial/java/threads/multithreaded.html">
 * Java Tutorial on Multithreaded Programming</a> for more
 * information on handling multiple threads in a Java program.
 *
 * @version $Revision: 1.8 $ $Date: 2005/04/07 09:15:29 $
 */
00083 public abstract class HttpServlet extends GenericServlet
        implements java.io.Serializable {
    private static final String METHOD_DELETE = "DELETE";
    private static final String METHOD_HEAD = "HEAD";
    private static final String METHOD_GET = "GET";
    private static final String METHOD_OPTIONS = "OPTIONS";
    private static final String METHOD_POST = "POST";
    private static final String METHOD_PUT = "PUT";
    private static final String METHOD_TRACE = "TRACE";

    private static final String HEADER_IFMODSINCE = "If-Modified-Since";
    private static final String HEADER_LASTMOD = "Last-Modified";

    private static final String LSTRING_FILE =
            "javax.servlet.http.LocalStrings";
    private static ResourceBundle lStrings =
            ResourceBundle.getBundle(LSTRING_FILE);

    /**
     * Does nothing, because this is an abstract class.
     */
00104     public HttpServlet() {
    }

    /**
     * Called by the server (via the <code>service</code> method) to
     * allow a servlet to handle a GET request.
     *
     * <p>Overriding this method to support a GET request also
     * automatically supports an HTTP HEAD request. A HEAD
     * request is a GET request that returns no body in the
     * response, only the request header fields.
     *
     * <p>When overriding this method, read the request data,
     * write the response headers, get the response's writer or
     * output stream object, and finally, write the response data.
     * It's best to include content type and encoding. When using
     * a <code>PrintWriter</code> object to return the response,
     * set the content type before accessing the
     * <code>PrintWriter</code> object.
     *
     * <p>The servlet container must write the headers before
     * committing the response, because in HTTP the headers must be sent
     * before the response body.
     *
     * <p>Where possible, set the Content-Length header (with the
     * {@link javax.servlet.ServletResponse#setContentLength} method),
     * to allow the servlet container to use a persistent connection
     * to return its response to the client, improving performance.
     * The content length is automatically set if the entire response fits
     * inside the response buffer.
     *
     * <p>When using HTTP 1.1 chunked encoding (which means that the response
     * has a Transfer-Encoding header), do not set the Content-Length header.
     *
     * <p>The GET method should be safe, that is, without
     * any side effects for which users are held responsible.
     * For example, most form queries have no side effects.
     * If a client request is intended to change stored data,
     * the request should use some other HTTP method.
     *
     * <p>The GET method should also be idempotent, meaning
     * that it can be safely repeated. Sometimes making a
     * method safe also makes it idempotent. For example,
     * repeating queries is both safe and idempotent, but
     * buying a product online or modifying data is neither
     * safe nor idempotent.
     *
     * <p>If the request is incorrectly formatted, <code>doGet</code>
     * returns an HTTP "Bad Request" message.
     *
     *
     * @param req an {@link HttpServletRequest} object that
     * contains the request the client has made of the servlet
     *
     * @param resp an {@link HttpServletResponse} object that
     * contains the response the servlet sends to the client
     *
     * @exception IOException if an input or output error is
     * detected when the servlet handles the GET request
     *
     * @exception ServletException if the request for the GET
     * could not be handled
     *
     * @see javax.servlet.ServletResponse#setContentType
     */
00169     protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        String protocol = req.getProtocol();
        String msg = lStrings.getString("http.method_get_not_supported");
        if (protocol.endsWith("1.1")) {
            resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, msg);
        } else {
            resp.sendError(HttpServletResponse.SC_BAD_REQUEST, msg);
        }
    }

    /**
     * Returns the time the <code>HttpServletRequest</code>
     * object was last modified,
     * in milliseconds since midnight January 1, 1970 GMT.
     * If the time is unknown, this method returns a negative
     * number (the default).
     *
     * <p>Servlets that support HTTP GET requests and can quickly determine
     * their last modification time should override this method.
     * This makes browser and proxy caches work more effectively,
     * reducing the load on server and network resources.
     *
     * @param req the <code>HttpServletRequest</code>
     * object that is sent to the servlet
     *
     * @return a <code>long</code> integer specifying
     * the time the <code>HttpServletRequest</code> object was
     * last modified, in milliseconds since midnight, January 1,
     * 1970 GMT, or -1 if the time is not known
     */
00200     protected long getLastModified(HttpServletRequest req) {
        return -1;
    }

    /**
     * <p>Receives an HTTP HEAD request from the protected
     * <code>service</code> method and handles the
     * request.
     * The client sends a HEAD request when it wants
     * to see only the headers of a response, such as
     * Content-Type or Content-Length. The HTTP HEAD
     * method counts the output bytes in the response
     * to set the Content-Length header accurately.
     *
     * <p>If you override this method, you can avoid computing
     * the response body and just set the response headers
     * directly to improve performance. Make sure that the
     * <code>doHead</code> method you write is both safe
     * and idempotent (that is, protects itself from being
     * called multiple times for one HTTP HEAD request).
     *
     * <p>If the HTTP HEAD request is incorrectly formatted,
     * <code>doHead</code> returns an HTTP "Bad Request"
     * message.
     *
     * @param req the request object that is passed
     * to the servlet
     *
     * @param resp the response object that the servlet
     * uses to return the headers to the clien
     *
     * @exception IOException if an input or output error occurs
     *
     * @exception ServletException if the request for the HEAD
     * could not be handled
     */
00236     protected void doHead(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        NoBodyResponse response = new NoBodyResponse(resp);

        doGet(req, response);
        response.setContentLength();
    }

    /**
     * Called by the server (via the <code>service</code> method)
     * to allow a servlet to handle a POST request.
     *
     * The HTTP POST method allows the client to send
     * data of unlimited length to the Web server a single time
     * and is useful when posting information such as
     * credit card numbers.
     *
     * <p>When overriding this method, read the request data,
     * write the response headers, get the response's writer or output
     * stream object, and finally, write the response data. It's best
     * to include content type and encoding. When using a
     * <code>PrintWriter</code> object to return the response, set the
     * content type before accessing the <code>PrintWriter</code> object.
     *
     * <p>The servlet container must write the headers before committing the
     * response, because in HTTP the headers must be sent before the
     * response body.
     *
     * <p>Where possible, set the Content-Length header (with the
     * {@link javax.servlet.ServletResponse#setContentLength} method),
     * to allow the servlet container to use a persistent connection
     * to return its response to the client, improving performance.
     * The content length is automatically set if the entire response fits
     * inside the response buffer.
     *
     * <p>When using HTTP 1.1 chunked encoding (which means that the response
     * has a Transfer-Encoding header), do not set the Content-Length header.
     *
     * <p>This method does not need to be either safe or idempotent.
     * Operations requested through POST can have side effects for
     * which the user can be held accountable, for example,
     * updating stored data or buying items online.
     *
     * <p>If the HTTP POST request is incorrectly formatted,
     * <code>doPost</code> returns an HTTP "Bad Request" message.
     *
     * @param req an {@link HttpServletRequest} object that
     * contains the request the client has made of the servlet
     *
     * @param resp an {@link HttpServletResponse} object that
     * contains the response the servlet sends to the client
     *
     * @exception IOException if an input or output error is
     * detected when the servlet handles the request
     *
     * @exception ServletException if the request for the POST
     * could not be handled
     *
     * @see javax.servlet.ServletOutputStream
     * @see javax.servlet.ServletResponse#setContentType
     */
00297     protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        String protocol = req.getProtocol();
        String msg = lStrings.getString("http.method_post_not_supported");
        if (protocol.endsWith("1.1")) {
            resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, msg);
        } else {
            resp.sendError(HttpServletResponse.SC_BAD_REQUEST, msg);
        }
    }

    /**
     * Called by the server (via the <code>service</code> method)
     * to allow a servlet to handle a PUT request.
     *
     * The PUT operation allows a client to
     * place a file on the server and is similar to
     * sending a file by FTP.
     *
     * <p>When overriding this method, leave intact
     * any content headers sent with the request (including
     * Content-Length, Content-Type, Content-Transfer-Encoding,
     * Content-Encoding, Content-Base, Content-Language, Content-Location,
     * Content-MD5, and Content-Range). If your method cannot
     * handle a content header, it must issue an error message
     * (HTTP 501 - Not Implemented) and discard the request.
     * For more information on HTTP 1.1, see RFC 2616
     * <a href="http://www.ietf.org/rfc/rfc2616.txt"></a>.
     *
     * <p>This method does not need to be either safe or idempotent.
     * Operations that <code>doPut</code> performs can have side
     * effects for which the user can be held accountable. When using
     * this method, it may be useful to save a copy of the
     * affected URL in temporary storage.
     *
     * <p>If the HTTP PUT request is incorrectly formatted,
     * <code>doPut</code> returns an HTTP "Bad Request" message.
     *
     * @param req the {@link HttpServletRequest} object that
     * contains the request the client made of the servlet
     *
     * @param resp the {@link HttpServletResponse} object that
     * contains the response the servlet returns to the client
     *
     * @exception IOException if an input or output error occurs
     * while the servlet is handling the PUT request
     *
     * @exception ServletException if the request for the PUT
     * cannot be handled
     */
00347     protected void doPut(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        String protocol = req.getProtocol();
        String msg = lStrings.getString("http.method_put_not_supported");
        if (protocol.endsWith("1.1")) {
            resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, msg);
        } else {
            resp.sendError(HttpServletResponse.SC_BAD_REQUEST, msg);
        }
    }

    /**
     * Called by the server (via the <code>service</code> method)
     * to allow a servlet to handle a DELETE request.
     *
     * The DELETE operation allows a client to remove a document
     * or Web page from the server.
     *
     * <p>This method does not need to be either safe
     * or idempotent. Operations requested through
     * DELETE can have side effects for which users
     * can be held accountable. When using
     * this method, it may be useful to save a copy of the
     * affected URL in temporary storage.
     *
     * <p>If the HTTP DELETE request is incorrectly formatted,
     * <code>doDelete</code> returns an HTTP "Bad Request"
     * message.
     *
     * @param req the {@link HttpServletRequest} object that
     * contains the request the client made of the servlet
     *
     * @param resp the {@link HttpServletResponse} object that
     * contains the response the servlet returns to the client
     *
     * @exception IOException if an input or output error occurs
     * while the servlet is handling the DELETE request
     *
     * @exception ServletException if the request for the
     * DELETE cannot be handled
     */
00388     protected void doDelete(HttpServletRequest req,
            HttpServletResponse resp)
            throws ServletException, IOException {
        String protocol = req.getProtocol();
        String msg = lStrings.getString("http.method_delete_not_supported");
        if (protocol.endsWith("1.1")) {
            resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, msg);
        } else {
            resp.sendError(HttpServletResponse.SC_BAD_REQUEST, msg);
        }
    }

    private Method[] getAllDeclaredMethods(Class c) {
        if (c.getName().equals("javax.servlet.http.HttpServlet"))
            return null;

        int j = 0;
        Method[] parentMethods = getAllDeclaredMethods(c.getSuperclass());
        Method[] thisMethods = c.getDeclaredMethods();

        if (parentMethods != null) {
            Method[] allMethods =
                    new Method[parentMethods.length + thisMethods.length];
            for (int i = 0; i < parentMethods.length; i++) {
                allMethods[i] = parentMethods[i];
                j = i;
            }
            j++;
            for (int i = j; i < thisMethods.length + j; i++) {
                allMethods[i] = thisMethods[i - j];
            }
            return allMethods;
        }
        return thisMethods;
    }

    /**
     * Called by the server (via the <code>service</code> method)
     * to allow a servlet to handle a OPTIONS request.
     *
     * The OPTIONS request determines which HTTP methods
     * the server supports and
     * returns an appropriate header. For example, if a servlet
     * overrides <code>doGet</code>, this method returns the
     * following header:
     *
     * <p><code>Allow: GET, HEAD, TRACE, OPTIONS</code>
     *
     * <p>There's no need to override this method unless the
     * servlet implements new HTTP methods, beyond those
     * implemented by HTTP 1.1.
     *
     * @param req the {@link HttpServletRequest} object that
     * contains the request the client made of the servlet
     *
     * @param resp the {@link HttpServletResponse} object that
     * contains the response the servlet returns to the client
     *
     * @exception IOException if an input or output error occurs
     * while the servlet is handling the OPTIONS request
     *
     * @exception ServletException if the request for the
     * OPTIONS cannot be handled
     */
00452     protected void doOptions(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        Method[] methods = getAllDeclaredMethods(this.getClass());

        boolean ALLOW_GET = false;
        boolean ALLOW_HEAD = false;
        boolean ALLOW_POST = false;
        boolean ALLOW_PUT = false;
        boolean ALLOW_DELETE = false;
        boolean ALLOW_TRACE = true;
        boolean ALLOW_OPTIONS = true;

        for (int i = 0; i < methods.length; i++) {
            Method m = methods[i];

            if (m.getName().equals("doGet")) {
                ALLOW_GET = true;
                ALLOW_HEAD = true;
            }
            if (m.getName().equals("doPost"))
                ALLOW_POST = true;
            if (m.getName().equals("doPut"))
                ALLOW_PUT = true;
            if (m.getName().equals("doDelete"))
                ALLOW_DELETE = true;
        }

        String allow = null;
        if (ALLOW_GET)
            if (allow == null) allow = METHOD_GET;
        if (ALLOW_HEAD)
            if (allow == null)
                allow = METHOD_HEAD;
            else
                allow += ", " + METHOD_HEAD;
        if (ALLOW_POST)
            if (allow == null)
                allow = METHOD_POST;
            else
                allow += ", " + METHOD_POST;
        if (ALLOW_PUT)
            if (allow == null)
                allow = METHOD_PUT;
            else
                allow += ", " + METHOD_PUT;
        if (ALLOW_DELETE)
            if (allow == null)
                allow = METHOD_DELETE;
            else
                allow += ", " + METHOD_DELETE;
        if (ALLOW_TRACE)
            if (allow == null)
                allow = METHOD_TRACE;
            else
                allow += ", " + METHOD_TRACE;
        if (ALLOW_OPTIONS)
            if (allow == null)
                allow = METHOD_OPTIONS;
            else
                allow += ", " + METHOD_OPTIONS;

        resp.setHeader("Allow", allow);
    }

    /**
     * Called by the server (via the <code>service</code> method)
     * to allow a servlet to handle a TRACE request.
     *
     * A TRACE returns the headers sent with the TRACE
     * request to the client, so that they can be used in
     * debugging. There's no need to override this method.
     *
     * @param req the {@link HttpServletRequest} object that
     * contains the request the client made of the servlet
     *
     * @param resp the {@link HttpServletResponse} object that
     * contains the response the servlet returns to the client
     *
     * @exception IOException if an input or output error occurs
     * while the servlet is handling the TRACE request
     *
     * @exception ServletException if the request for the
     * TRACE cannot be handled
     */
00536     protected void doTrace(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {

        int responseLength;

        String CRLF = "\r\n";
        String responseString = "TRACE " + req.getRequestURI() +
                " " + req.getProtocol();

        Enumeration reqHeaderEnum = req.getHeaderNames();

        while (reqHeaderEnum.hasMoreElements()) {
            String headerName = (String) reqHeaderEnum.nextElement();
            responseString += CRLF + headerName + ": " +
                    req.getHeader(headerName);
        }

        responseString += CRLF;

        responseLength = responseString.length();

        resp.setContentType("message/http");
        resp.setContentLength(responseLength);
        ServletOutputStream out = resp.getOutputStream();
        out.print(responseString);
        out.close();
        return;
    }

    /**
     * Receives standard HTTP requests from the public
     * <code>service</code> method and dispatches
     * them to the <code>do</code><i>XXX</i> methods defined in
     * this class. This method is an HTTP-specific version of the
     * {@link javax.servlet.Servlet#service} method. There's no
     * need to override this method.
     *
     * @param req the {@link HttpServletRequest} object that
     * contains the request the client made of the servlet
     *
     * @param resp the {@link HttpServletResponse} object that
     * contains the response the servlet returns to the client
     *
     * @exception IOException if an input or output error occurs
     * while the servlet is handling the HTTP request
     *
     * @exception ServletException if the HTTP request
     * cannot be handled
     *
     * @see javax.servlet.Servlet#service
     */
00587     protected void service(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        String method = req.getMethod();

        if (method.equals(METHOD_GET)) {
            long lastModified = getLastModified(req);
            if (lastModified == -1) {
                // servlet doesn't support if-modified-since, no reason
                // to go through further expensive logic
                doGet(req, resp);
            } else {
                long ifModifiedSince = req.getDateHeader(HEADER_IFMODSINCE);
                if (ifModifiedSince < (lastModified / 1000 * 1000)) {
                    // If the servlet mod time is later, call doGet()
                    // Round down to the nearest second for a proper compare
                    // A ifModifiedSince of -1 will always be less
                    maybeSetLastModified(resp, lastModified);
                    doGet(req, resp);
                } else {
                    resp.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
                }
            }

        } else if (method.equals(METHOD_HEAD)) {
            long lastModified = getLastModified(req);
            maybeSetLastModified(resp, lastModified);
            doHead(req, resp);

        } else if (method.equals(METHOD_POST)) {
            doPost(req, resp);

        } else if (method.equals(METHOD_PUT)) {
            doPut(req, resp);

        } else if (method.equals(METHOD_DELETE)) {
            doDelete(req, resp);

        } else if (method.equals(METHOD_OPTIONS)) {
            doOptions(req, resp);

        } else if (method.equals(METHOD_TRACE)) {
            doTrace(req, resp);

        } else {
            //
            // Note that this means NO servlet supports whatever
            // method was requested, anywhere on this server.
            //

            String errMsg = lStrings.getString("http.method_not_implemented");
            Object[] errArgs = new Object[1];
            errArgs[0] = method;
            errMsg = MessageFormat.format(errMsg, errArgs);

            resp.sendError(HttpServletResponse.SC_NOT_IMPLEMENTED, errMsg);
        }
    }

    /**
     * Sets the Last-Modified entity header field, if it has not
     * already been set and if the value is meaningful.  Called before
     * doGet, to ensure that headers are set before response data is
     * written.  A subclass might have set this header already, so we
     * check.
     */
00652     private void maybeSetLastModified(HttpServletResponse resp, long lastModified) {
        if (resp.containsHeader(HEADER_LASTMOD))
            return;
        if (lastModified >= 0)
            resp.setDateHeader(HEADER_LASTMOD, lastModified);
    }

    /**
     * Dispatches client requests to the protected
     * <code>service</code> method. There's no need to
     * override this method.
     *
     * @param req the {@link HttpServletRequest} object that
     * contains the request the client made of the servlet
     *
     * @param res the {@link HttpServletResponse} object that
     * contains the response the servlet returns to the client
     *
     * @exception IOException if an input or output error occurs
     * while the servlet is handling the HTTP request
     *
     * @exception ServletException if the HTTP request cannot
     * be handled
     *
     * @see javax.servlet.Servlet#service
     */
00678     public void service(ServletRequest req, ServletResponse res)
            throws ServletException, IOException {
        HttpServletRequest request;
        HttpServletResponse response;

        try {
            request = (HttpServletRequest) req;
            response = (HttpServletResponse) res;
        } catch (ClassCastException e) {
            throw new ServletException("non-HTTP request or response");
        }
        service(request, response);
    }
}

/**
 * A response that includes no body, for use in (dumb) "HEAD" support.
 * This just swallows that body, counting the bytes in order to set
 * the content length appropriately.  All other methods delegate directly
 * to the HTTP Servlet Response object used to construct this one.
 */
00699 class NoBodyResponse implements HttpServletResponse {
    private HttpServletResponse resp;
    private NoBodyOutputStream noBody;
    private PrintWriter writer;
    private boolean didSetContentLength;

    NoBodyResponse(HttpServletResponse r) {
        resp = r;
        noBody = new NoBodyOutputStream();
    }

    void setContentLength() {
        if (!didSetContentLength) {
            resp.setContentLength(noBody.getContentLength());
        }
    }

    //
    // SERVLET RESPONSE interface methods
    //

00720     public void setContentLength(int len) {
        resp.setContentLength(len);
        didSetContentLength = true;
    }

00725     public void setCharacterEncoding(String charset) {
        resp.setCharacterEncoding(charset);
    }

00729     public void setContentType(String type) {
        resp.setContentType(type);
    }

00733     public String getContentType() {
        return resp.getContentType();
    }

00737     public ServletOutputStream getOutputStream() throws IOException {
        return noBody;
    }

00741     public String getCharacterEncoding() {
        return resp.getCharacterEncoding();
    }

00745     public PrintWriter getWriter() throws UnsupportedEncodingException {
        if (writer == null) {
            OutputStreamWriter w;

            w = new OutputStreamWriter(noBody, getCharacterEncoding());
            writer = new PrintWriter(w);
        }
        return writer;
    }

00755     public void setBufferSize(int size) throws IllegalStateException {
        resp.setBufferSize(size);
    }

00759     public int getBufferSize() {
        return resp.getBufferSize();
    }

00763     public void reset() throws IllegalStateException {
        resp.reset();
    }

00767     public void resetBuffer() throws IllegalStateException {
        resp.resetBuffer();
    }

00771     public boolean isCommitted() {
        return resp.isCommitted();
    }

00775     public void flushBuffer() throws IOException {
        resp.flushBuffer();
    }

00779     public void setLocale(Locale loc) {
        resp.setLocale(loc);
    }

00783     public Locale getLocale() {
        return resp.getLocale();
    }

    //
    // HTTP SERVLET RESPONSE interface methods
    //

00791     public void addCookie(Cookie cookie) {
        resp.addCookie(cookie);
    }

00795     public boolean containsHeader(String name) {
        return resp.containsHeader(name);
    }

    /**
     * @deprecated
     */
00802     public void setStatus(int sc, String sm) {
        resp.setStatus(sc, sm);
    }

00806     public void setStatus(int sc) {
        resp.setStatus(sc);
    }

00810     public void setHeader(String name, String value) {
        resp.setHeader(name, value);
    }

00814     public void setIntHeader(String name, int value) {
        resp.setIntHeader(name, value);
    }

00818     public void setDateHeader(String name, long date) {
        resp.setDateHeader(name, date);
    }

00822     public void sendError(int sc, String msg) throws IOException {
        resp.sendError(sc, msg);
    }

00826     public void sendError(int sc) throws IOException {
        resp.sendError(sc);
    }

00830     public void sendRedirect(String location) throws IOException {
        resp.sendRedirect(location);
    }

00834     public String encodeURL(String url) {
        return resp.encodeURL(url);
    }

00838     public String encodeRedirectURL(String url) {
        return resp.encodeRedirectURL(url);
    }

00842     public void addHeader(String name, String value) {
        resp.addHeader(name, value);
    }

00846     public void addDateHeader(String name, long value) {
        resp.addDateHeader(name, value);
    }

00850     public void addIntHeader(String name, int value) {
        resp.addIntHeader(name, value);
    }

    /**
     * @deprecated As of Version 2.1, replaced by
     * {@link HttpServletResponse#encodeURL}.
     */
00858     public String encodeUrl(String url) {
        return this.encodeURL(url);
    }

    /**
     * @deprecated As of Version 2.1, replaced by
     * {@link HttpServletResponse#encodeRedirectURL}.
     */
00866     public String encodeRedirectUrl(String url) {
        return this.encodeRedirectURL(url);
    }
}


/**
 * Servlet output stream that gobbles up all its data.
 */
00875 class NoBodyOutputStream extends ServletOutputStream {
    private static final String LSTRING_FILE =
            "javax.servlet.http.LocalStrings";
    private static ResourceBundle lStrings =
            ResourceBundle.getBundle(LSTRING_FILE);

    private int contentLength = 0;

    NoBodyOutputStream() {
    }

    int getContentLength() {
        return contentLength;
    }

    public void write(int b) {
        contentLength++;
    }

    public void write(byte buf[], int offset, int len)
            throws IOException {
        if (len >= 0) {
            contentLength += len;
        } else {
            // XXX
            // isn't this really an IllegalArgumentException?

            String msg = lStrings.getString("err.io.negativelength");
            throw new IOException("negative length");
        }
    }
}

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