<span style="font-family: Arial, Helvetica, sans-serif;"></span><p>首先，在propotities-> Java build path　-> Libraries中add external jars中引入httpclient-4.2.5.jar和httpmime-4.2.5.jar　</p><p>然後再將這兩個包拷貝到專案工程下的libs目錄下；</p>

<span style="font-family: Arial, Helvetica, sans-serif;">import java.io.ByteArrayOutputStream;</span>
 

import java.io.IOException;
import java.util.Iterator;
import java.util.List;
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.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.params.HttpClientParams;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.ByteArrayBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;

/**
 * HTTP請求輔助類，用於人臉識別過程中向face++傳送請求
 * @author witness
 * 
 */

public class HTTPUtils {


	
		
	private static HttpParams httpParams = new BasicHttpParams();
	private static HttpClient httpClient = getHttpClient();
	
	public static String doGet(String url, Map params){
		String paramStr = "";  
        Iterator iter = params.entrySet().iterator();  
        while (iter.hasNext()) {  
            Map.Entry entry = (Map.Entry) iter.next();  
            Object key = entry.getKey();  
            Object val = entry.getValue();  
            paramStr += paramStr = "&" + key + "=" + val;  
        }  
//        if (!paramStr.equals("")) {  
//            paramStr = paramStr.replaceFirst("&", "?");  
//            url += paramStr;  
//        }  
        HttpGet httpRequest = new HttpGet(url);  
        String strResult = "doGetError";  
        try {  
            /* 傳送請求並等待響應 */  
            HttpResponse httpResponse = httpClient.execute(httpRequest);  
            /* 若狀態碼為200 ok */  
            if (httpResponse.getStatusLine().getStatusCode() == 200) {  
                /* 讀返回資料 */  
                strResult = EntityUtils.toString(httpResponse.getEntity());  
            } else {  
                strResult = "Error Response: "  
                        + httpResponse.getStatusLine().toString();  
            }  
        } catch (ClientProtocolException e) {  
            strResult = e.getMessage().toString();  
            e.printStackTrace();  
        } catch (IOException e) {  
            strResult = e.getMessage().toString();  
            e.printStackTrace();  
        } catch (Exception e) {  
            strResult = e.getMessage().toString();  
            e.printStackTrace();  
        }  
        Log.v("strResult", strResult);  
        return strResult;  
	}
	
	
	@SuppressWarnings("deprecation")
	public static String doPost(String url, byte[] imgData) {  
        /* 建立HTTPPost物件 */  
        HttpPost httpRequest = new HttpPost(url);  
        String strResult = "doPostError";  
        try {  
        	MultipartEntity entity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
            /* 新增請求引數到請求物件 */ 
        	ByteArrayBody img = new ByteArrayBody(imgData, "img");
        	StringBody key = new StringBody(Constants.API_KEY);
        	StringBody secret = new StringBody(Constants.API_SECRET);
        	entity.addPart("img", img);
        	entity.addPart("api_key", key);
        	entity.addPart("api_secret", secret);
            httpRequest.setEntity(entity);  
            /* 傳送請求並等待響應 */  
            HttpResponse httpResponse = httpClient.execute(httpRequest);  
            /* 若狀態碼為200 ok */  
            if (httpResponse.getStatusLine().getStatusCode() == 200) {  
                /* 讀返回資料 */  
                strResult = EntityUtils.toString(httpResponse.getEntity());  
            } else {  
                strResult = "Error Response: "  
                        + httpResponse.getStatusLine().toString();  
            }  
        } catch (ClientProtocolException e) {  
            strResult = e.getMessage().toString();  
            e.printStackTrace();  
        } catch (IOException e) {  
            strResult = e.getMessage().toString();  
            e.printStackTrace();  
        } catch (Exception e) {  
            strResult = e.getMessage().toString();  
            e.printStackTrace();  
        }  
        Log.v("strResult", strResult);  
        return strResult;  
    }
	
	private static HttpClient getHttpClient() {  
        // 設定連線超時和 Socket 超時，以及 Socket 快取大小  
        HttpConnectionParams.setConnectionTimeout(httpParams, 20 * 1000);  
        HttpConnectionParams.setSoTimeout(httpParams, 20 * 1000);  
        HttpConnectionParams.setSocketBufferSize(httpParams, 8192);  
        // 設定重定向，預設為 true  
        HttpClientParams.setRedirecting(httpParams, true);  
        // 設定 user agent  
        String userAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2) Gecko/20100115 Firefox/3.6";  
        HttpProtocolParams.setUserAgent(httpParams, userAgent);  
        // 建立一個 HttpClient 例項  
        // 注意 HttpClient httpClient = new HttpClient(); 是Commons HttpClient  
        // 中的用法，在 Android 1.5 中我們需要使用 Apache 的預設實現 DefaultHttpClient  
        httpClient = new DefaultHttpClient(httpParams);  
        return httpClient;  
    }  
	public static byte[] getBitmapByte(Bitmap bitmap){  
	    ByteArrayOutputStream out = new ByteArrayOutputStream();  
	    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);  
	    try {  
	        out.flush();  
	        out.close();  
	    } catch (IOException e) {  
	        e.printStackTrace();  
	    }  
	    return out.toByteArray();  
	}  
	  
	  
	public static Bitmap getBitmapFromByte(byte[] temp){  
	    if(temp != null){  
	        Bitmap bitmap = BitmapFactory.decodeByteArray(temp, 0, temp.length);  
	        return bitmap;  
	    }else{  
	        return null;  
	    }  
	}  
}