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Java example source code file (EchoHandler.java)

This example source code file (EchoHandler.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

bytearrayentity, echohandler, get, httpcontext, httpentityenclosingrequest, httpexception, httprequest, httprequesthandler, httpresponse, io, ioexception, methodnotsupportedexception, post, put, string, util

The EchoHandler.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
 * "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 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.localserver;

import java.io.IOException;
import java.util.Locale;

import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.MethodNotSupportedException;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.HttpRequestHandler;
import org.apache.http.util.EntityUtils;



/**
 * A handler that echos the incoming request entity.
 * 
 *
 *
 * <!-- empty lines to avoid 'svn diff' problems -->
 */
public class EchoHandler
    implements HttpRequestHandler {

    // public default constructor

    /**
     * Handles a request by echoing the incoming request entity.
     * If there is no request entity, an empty document is returned.
     *
     * @param request   the request
     * @param response  the response
     * @param context   the context
     *
     * @throws HttpException    in case of a problem
     * @throws IOException      in case of an IO problem
     */
    public void handle(final HttpRequest request, 
                       final HttpResponse response,
                       final HttpContext context)
        throws HttpException, IOException {

        String method = request.getRequestLine().getMethod().toUpperCase(Locale.ENGLISH);
        if (!"GET".equals(method) &&
            !"POST".equals(method) &&
            !"PUT".equals(method)
            ) {
            throw new MethodNotSupportedException
                (method + " not supported by " + getClass().getName());
        }

        HttpEntity entity = null;
        if (request instanceof HttpEntityEnclosingRequest)
            entity = ((HttpEntityEnclosingRequest)request).getEntity();

        // For some reason, just putting the incoming entity into
        // the response will not work. We have to buffer the message.
        byte[] data;
        if (entity == null) {
            data = new byte [0];
        } else {
            data = EntityUtils.toByteArray(entity);
        }

        ByteArrayEntity bae = new ByteArrayEntity(data);
        if (entity != null) {
            bae.setContentType(entity.getContentType());
        }
        entity = bae;

        response.setStatusCode(HttpStatus.SC_OK);
        response.setEntity(entity);

    } // handle


} // class EchoHandler

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