Java HTTP Get doGet(String url)

Description

Do GET request

License

Apache License

Parameter

Parameter	Description
url	a parameter

Exception

Parameter	Description
Exception	an exception
IOException	an exception

Declaration

public static String doGet(String url) throws Exception 

Method Source Code

//package com.java2s;
//License from project: Apache License 

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

import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.URL;
import java.net.URLConnection;

public class Main {
    private static String charset = "utf-8";
    private static String proxyHost = null;
    private static Integer proxyPort = null;

    /**/*from  w  w w.java 2  s .co m*/
     * Do GET request
     * @param url
     * @return
     * @throws Exception
     * @throws IOException
     */
    public static String doGet(String url) throws Exception {

        URL localURL = new URL(url);
        URLConnection connection = openConnection(localURL);
        HttpURLConnection httpURLConnection = (HttpURLConnection) connection;

        httpURLConnection.setRequestProperty("Accept-Charset", charset);
        httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

        InputStream inputStream = null;
        InputStreamReader inputStreamReader = null;
        BufferedReader reader = null;
        StringBuffer resultBuffer = new StringBuffer();
        String tempLine = null;

        if (httpURLConnection.getResponseCode() >= 300) {
            throw new Exception(
                    "HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());
        }

        try {
            inputStream = httpURLConnection.getInputStream();
            inputStreamReader = new InputStreamReader(inputStream);
            reader = new BufferedReader(inputStreamReader);

            while ((tempLine = reader.readLine()) != null) {
                resultBuffer.append(tempLine);
            }

        } finally {

            if (reader != null) {
                reader.close();
            }

            if (inputStreamReader != null) {
                inputStreamReader.close();
            }

            if (inputStream != null) {
                inputStream.close();
            }

        }

        return resultBuffer.toString();
    }

    private static URLConnection openConnection(URL localURL) throws IOException {
        URLConnection connection;
        if (proxyHost != null && proxyPort != null) {
            Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort));
            connection = localURL.openConnection(proxy);
        } else {
            connection = localURL.openConnection();
        }
        return connection;
    }
}

Related

1. doGET(HttpURLConnection conn)
2. doGet(String theURL, Map nameValuePairs)
3. doGet(String url, HashMap params)
4. doGet(String urlStr)
5. doGet(String urlString)
6. doGet(URL url, String... args)