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Java example source code file (ClientConnectionRelease.java)

This example source code file (ClientConnectionRelease.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

bufferedreader, clientconnectionrelease, defaulthttpclient, httpclient, httpentity, httpget, httpresponse, io, ioexception, runtimeexception

The ClientConnectionRelease.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.examples.client;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

/**
 * This example demonstrates the recommended way of using API to make sure 
 * the underlying connection gets released back to the connection manager.
 */
public class ClientConnectionRelease {

    public final static void main(String[] args) throws Exception {
        HttpClient httpclient = new DefaultHttpClient();

        HttpGet httpget = new HttpGet("http://www.apache.org/"); 

        // Execute HTTP request
        System.out.println("executing request " + httpget.getURI());
        HttpResponse response = httpclient.execute(httpget);

        System.out.println("----------------------------------------");
        System.out.println(response.getStatusLine());
        System.out.println("----------------------------------------");

        // Get hold of the response entity
        HttpEntity entity = response.getEntity();
        
        // If the response does not enclose an entity, there is no need
        // to bother about connection release
        if (entity != null) {
            BufferedReader reader = new BufferedReader(
                    new InputStreamReader(entity.getContent()));
            try {
                
                // do something useful with the response
                System.out.println(reader.readLine());
                
            } catch (IOException ex) {

                // In case of an IOException the connection will be released
                // back to the connection manager automatically
                throw ex;
                
            } catch (RuntimeException ex) {

                // In case of an unexpected exception you may want to abort
                // the HTTP request in order to shut down the underlying 
                // connection and release it back to the connection manager.
                httpget.abort();
                throw ex;
                
            } finally {

                // Closing the input stream will trigger connection release
                reader.close();
                
            }
        }

        // When HttpClient instance is no longer needed, 
        // shut down the connection manager to ensure
        // immediate deallocation of all system resources
        httpclient.getConnectionManager().shutdown();        
    }

}

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