org.apache.http.examples.client.ClientWithResponseHandler.java Source code

Introduction

Here is the source code for org.apache.http.examples.client.ClientWithResponseHandler.java

Source

/*
 * ====================================================================
 * 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 com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.io.IOException;

/**
 * This example demonstrates the use of the {@link ResponseHandler} to simplify
 * the process of processing the HTTP response and releasing associated resources.
 */
public class ClientWithResponseHandler {

    public final static void main(String[] args) throws Exception {
        CloseableHttpClient httpclient = HttpClients.createDefault();
        //    DefaultHttpParams.getDefaultParams().setParameter("http.protocol.cookie-policy", CookiePolicy.BROWSER_COMPATIBILITY);
        //    httpclient.getParams().setParameter(ClientPNames.COOKIE_POLICY, CookiePolicy.BEST_MATCH);
        try {
            //      HttpGet httpget = new HttpGet("http://localhost/");
            HttpGet httpget = new HttpGet(
                    "http://api.map.baidu.com/geocoder/v2/?address=&output=json&ak=E4805d16520de693a3fe707cdc962045&callback=showLocation");
            //      httpget.setHeader("Accept", "180.97.33.90:80");
            httpget.setHeader("Accept",
                    "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
            httpget.setHeader("Accept-Encoding", "gzip, deflate, sdch");
            httpget.setHeader("Accept-Language", "zh-CN,zh;q=0.8");
            httpget.setHeader("Cache-Control", "no-cache");
            httpget.setHeader("Connection", "keep-alive");
            httpget.setHeader("Referer",
                    "http://developer.baidu.com/map/index.php?title=webapi/guide/changeposition");
            httpget.setHeader("User-Agent",
                    "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.93 Safari/537.36");

            System.out.println("Executing request httpget.getRequestLine() " + httpget.getRequestLine());

            // Create a custom response handler
            ResponseHandler<String> responseHandler = new ResponseHandler<String>() {

                public String handleResponse(final HttpResponse response)
                        throws ClientProtocolException, IOException {
                    int status = response.getStatusLine().getStatusCode();
                    if (status >= 200 && status < 300) {
                        HttpEntity entity = response.getEntity();
                        return entity != null ? EntityUtils.toString(entity, "utf-8") : null;
                    } else {
                        throw new ClientProtocolException("Unexpected response status: " + status);
                    }
                }

            };
            String responseBody = httpclient.execute(httpget, responseHandler);
            System.out.println("----------------------------------------");
            System.out.println(responseBody);

            //showLocation&&showLocation({"status":0,"result":{"location":{"lng":112.25009284837,"lat":32.229168591538},"precise":0,"confidence":14,"level":"\u533a\u53bf"}})
            System.out.println("----------------------------------------");
            ObjectMapper mapper = new ObjectMapper();
            //      mapper.readValue(responseBody, AddressCoord.class);
            JsonNode root = mapper.readTree(
                    responseBody.substring("showLocation&&showLocation(".length(), responseBody.length() - 1));
            //      String name = root.get("name").asText();
            //      int age = root.get("age").asInt();
            String status = root.get("status").asText();
            String lng = root.with("result").with("location").get("lng").asText();
            String lat = root.with("result").with("location").get("lat").asText();
            String level = root.with("result").get("level").asText();
            System.out.println(String.format("'%1$s': [%2$s, %3$s], status: %4$s", level, lng, lat, status));

        } finally {
            httpclient.close();
        }
    }

}