invoke Get Url - Java java.net

Java examples for java.net:URL Read

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Description

invoke Get Url

Demo Code

/*//from  w w w .j av a  2 s  .  c  o  m
 * Licensed to csti consulting 
 * You may obtain a copy of the License at
 *
 * http://www.csticonsulting.com
 * Copyright (c) 2006-Aug 24, 2010 Consultation CS-TI inc. 
 *
 * 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.java2s;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.InputStreamReader;

import java.net.HttpURLConnection;
import java.net.URL;

public class Main {
    public static void main(String[] argv) throws Exception {
        String url = "java2s.com";
        System.out.println(invokeGetUrl(url));
    }

    public static String invokeGetUrl(String url) throws Exception {

        String agent = "Mozilla/4.0";

        HttpURLConnection conn = null;
        DataOutputStream output = null;
        DataInputStream in = null;
        BufferedReader is = null;
        try {
            URL postURL = new URL(url);
            conn = (HttpURLConnection) postURL.openConnection();

            // Set connection parameters. We need to perform input and output,
            conn.setDoInput(true);
            conn.setDoOutput(true);

            // Set the content type we are POSTing. We impersonate it as
            // encoded form data
            conn.setRequestProperty("User-Agent", agent);

            conn.setRequestMethod("GET");

            // get the output stream to POST to.
            output = new DataOutputStream(conn.getOutputStream());

            StringBuffer responseText = new StringBuffer();
            in = new DataInputStream(conn.getInputStream());
            int rc = conn.getResponseCode();
            if (rc != -1) {
                is = new BufferedReader(new InputStreamReader(
                        conn.getInputStream()));
                String _line = null;
                while (((_line = is.readLine()) != null)) {
                    responseText.append(_line);
                }

            }

            return responseText.toString();

        } finally {

            if (is != null) {
                try {
                    is.close();
                } catch (Exception ignore) {
                    // TODO: handle exception
                }
            }

            if (in != null) {
                try {
                    in.close();
                } catch (Exception ignore) {
                    // TODO: handle exception
                }
            }

            if (output != null) {
                try {
                    output.close();
                } catch (Exception ignore) {
                    // TODO: handle exception
                }
            }

            if (conn != null) {
                try {
                    conn.disconnect();
                } catch (Exception ignore) {
                    // TODO: handle exception
                }
            }

        }

    }
}

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