com.sciamlab.util.HTTPClient.java Source code

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Here is the source code for com.sciamlab.util.HTTPClient.java

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/**
 * ============================================================================
 *  Copyright (c) 2013,2014 SciamLab s.r.l.
 *
 *  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.
 * ============================================================================
 */

package com.sciamlab.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.Map;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;

/**
 * An HTTPClient helper class to perform REST calls
 */
public class HTTPClient {

    private HttpClient client;

    public HTTPClient() {
        this.client = new DefaultHttpClient();
    }

    public String doGET(URL url) throws IOException {

        return this.doGET(url, null);
    }

    public String doGET(URL url, String user_agent) throws IOException {

        URLConnection yc = url.openConnection();
        if (user_agent != null && !"".equals(user_agent))
            yc.setRequestProperty("User-Agent", user_agent);
        String output = "";
        BufferedReader in = null;
        try {
            in = new BufferedReader(new InputStreamReader(yc.getInputStream()));
            String inputLine;
            output = "";
            while ((inputLine = in.readLine()) != null)
                output += inputLine;

        } finally {
            if (in != null) {
                in.close();
            }
        }
        return output;
    }

    public StringBuffer doGETBig(URL url) throws IOException {

        URLConnection yc = url.openConnection();
        BufferedReader in = null;
        StringBuffer output = new StringBuffer();
        try {
            in = new BufferedReader(new InputStreamReader(yc.getInputStream()));
            String line = in.readLine();
            while (line != null) {
                output.append(line);
                line = in.readLine();
            }
        } finally {
            if (in != null) {
                in.close();
            }
        }

        return output;
    }

    public String doPOST(String url, String body, Map<String, String> headerParams)
            throws ClientProtocolException, IOException {

        HttpPost post = new HttpPost(url);
        StringEntity input = new StringEntity(body);
        post.setEntity(input);
        for (String param : headerParams.keySet()) {
            String value = headerParams.get(param);
            post.setHeader(param, value);
        }

        HttpResponse response = client.execute(post);
        BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
        String line = "";
        String out = "";
        while ((line = rd.readLine()) != null) {
            out += line;
        }
        return out;
    }

    public String doDELETE(String url, Map<String, String> headerParams)
            throws ClientProtocolException, IOException {

        HttpDelete delete = new HttpDelete(url);
        for (String param : headerParams.keySet()) {
            String value = headerParams.get(param);
            delete.setHeader(param, value);
        }

        HttpResponse response = client.execute(delete);
        BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
        String line = "";
        String out = "";
        while ((line = rd.readLine()) != null) {
            out += line;
        }
        return out;
    }

}