import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.log4j.Logger;

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

/**
 * ClassName: HttpRequestSender
 * @version  
 * @since JDK 1.7 
 */
public class HttpRequestSender {
	
	private static Logger logger = Logger.getLogger(HttpRequestSender.class);
	
	public static HttpResponse sendGet(String url, String queryString){
		if(url == null || url.equals("")){
			return null;
        }
		HttpRequest request = new HttpRequest(HttpResultType.STRING);
		request.setUrl(url);
		request.setMethod(HttpRequest.METHOD_GET);
		
		if(queryString != null && !queryString.equals("")){
			request.setQueryString(queryString);
        }
		HttpProtocolHandler httpProtocolHandler = HttpProtocolHandler.getInstance();
		try {
			HttpResponse httpResponse = httpProtocolHandler.execute(request, "", "");
			return httpResponse;
		} catch (HttpException e) {
            logger.error("Fail with send GET request: ", e);
		} catch (IOException e) {
            logger.error("Fail with send GET request: ", e);
		} catch (Exception e){
			logger.error("Fail with send GET request: ", e);
		}
		
		return null;
	}
	
	public static HttpResponse sendPost(String url, NameValuePair[] nvp){
		if(url == null || url.equals("")){
			return null;
        }
		HttpRequest request = new HttpRequest(HttpResultType.STRING);
		request.setUrl(url);
		request.setMethod(HttpRequest.METHOD_POST);
		
		if(nvp != null){
			request.setParameters(nvp);
        }
		HttpProtocolHandler httpProtocolHandler = HttpProtocolHandler.getInstance();
		try {
			HttpResponse httpResponse = httpProtocolHandler.execute(request, "", "");
			return httpResponse;
		} catch (HttpException e) {
            logger.error("Fail with send POST request: ", e);
		} catch (IOException e) {
            logger.error("Fail with send POST request: ", e);
		} catch (Exception e){
            logger.error("Fail with send POST request: ", e);
		}
		
		return null;
	}

    public static HttpResponse sendPost(String url, NameValuePair[] nvp, String fileNameParam,
                                        String fileNamePath){
        if(url == null || url.equals(""))
            return null;

        HttpRequest request = new HttpRequest(HttpResultType.STRING);
        request.setUrl(url);
        request.setMethod(HttpRequest.METHOD_POST);

        if(nvp != null)
            request.setParameters(nvp);

        HttpProtocolHandler httpProtocolHandler = HttpProtocolHandler.getInstance();
        try {
            HttpResponse httpResponse = httpProtocolHandler.execute(request, fileNameParam, fileNamePath);
            return httpResponse;
        } catch (HttpException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e){
            e.printStackTrace();
        }

        return null;
    }
	
    public static HttpResponse sendPost(String url, Map<String, String> map){
		NameValuePair[] nvpArray = null;
		if(map != null && map.size() > 0){
			nvpArray = new NameValuePair[map.size()];
			int i = 0;
			for(String key : map.keySet()){
				NameValuePair nvp = new NameValuePair(key, map.get(key));
				nvpArray[i++] = nvp;
			}
		}
		
		return sendPost(url, nvpArray);
    }

    public static String sendPost(String url, String param) throws Exception{
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 開啟和URL之間的連線
            URLConnection conn = realUrl.openConnection();
            // 設定通用的請求屬性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
            // 傳送POST請求必須設定如下兩行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 獲取URLConnection物件對應的輸出流
            out = new PrintWriter(conn.getOutputStream());
            // 傳送請求引數
            out.print(param);
            // flush輸出流的緩衝
            out.flush();
            // 定義BufferedReader輸入流來讀取URL的響應
            in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"UTF-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
            throw e;
        }
        // 使用finally塊來關閉輸出流、輸入流
        finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                logger.error(ex.getMessage(), ex);
                throw ex;
            }
        }
        return result;
    }
    
    /**
     * 向指定URL傳送GET方法的請求
     * 
     * @param url
     *            傳送請求的URL
     * @param param
     *            請求引數，請求引數應該是 name1=value1&name2=value2 的形式。
     * @return URL 所代表遠端資源的響應結果
     */
    public static String sendGetReuqest(String url, String param) throws Exception{
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 開啟和URL之間的連線
            URLConnection connection = realUrl.openConnection();
            // 設定通用的請求屬性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立實際的連線
            connection.connect();
            // 定義 BufferedReader輸入流來讀取URL的響應
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream(),"UTF-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
            throw e;
        }
        // 使用finally塊來關閉輸入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
            	logger.error(e2.getMessage(), e2);
                throw e2;
            }
        }
        return result;
    }
}