HttpClient中GET、POST方法示例，支援 HTTPS

import java.io.IOException;
import java.security.GeneralSecurityException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.HttpVersion;
import org.apache.http.NameValuePair;
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.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.CoreProtocolPNames;
import org.apache.http.params.HttpParams;
import org.apache.http.util.EntityUtils;

import net.sf.json.JSONObject;

public class HttpUtil {
	
	public static String connectUrlNotCheckSsl(String url, String requestMethod, JSONObject param) 
			throws RuntimeException, GeneralSecurityException, IOException {
		if (StringUtil.isNull(url)){
			throw new RuntimeException("請求地址不能為空！");
		}
		if (url.endsWith("/") || url.endsWith("?") || url.endsWith("&")) {
			url = url.substring(0, url.length() - 1);
		}
		if (url.length() <= 4) {
			url = "http://" + url;
		}
		if (!"http".equalsIgnoreCase(url.substring(0, 4))) {
			url = "http://" + url;
		}
		
		HttpParams httpParams = new BasicHttpParams();
		httpParams.setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
		httpParams.setParameter(CoreProtocolPNames.HTTP_CONTENT_CHARSET, "UTF-8");
		httpParams.setParameter(CoreProtocolPNames.USER_AGENT, "Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko");
		
		HttpClient httpClient = null;
		if ("http:".equalsIgnoreCase(url.substring(0, 5))) {
			httpClient = new DefaultHttpClient(httpParams);
		} else {
			httpClient = new SSLDefaultHttpClient(httpParams);
		}
		HttpResponse httpResponse = null;
		if (StringUtil.isNotNull(requestMethod) && "post".equalsIgnoreCase(requestMethod)) { //post請求
			HttpPost httpPost = new HttpPost(url);
			if (param != null && !param.isEmpty()) {
				List<NameValuePair> postParam = new ArrayList<NameValuePair>();
				Iterator<?> it = param.keys();
				while (it.hasNext()) {
					String key = (String) it.next();
					String value = param.getString(key);
					postParam.add(new BasicNameValuePair(key, value));
				}
				UrlEncodedFormEntity entity = new UrlEncodedFormEntity(postParam, "UTF-8");
				httpPost.setEntity(entity);
			}
			httpResponse = httpClient.execute(httpPost);
		} else { //get請求
			if (param != null && !param.isEmpty()) {
				StringBuffer sb = new StringBuffer();
				Iterator<?> it = param.keys();
				while (it.hasNext()) {
					String key = (String) it.next();
					String value = param.getString(key);
					if (sb.length() <= 0) {
						sb.append("?");
					} else {
						sb.append("&");
					}
					sb.append(key).append("=").append(value);
				}
				url += sb.toString();
			}
			HttpGet httpGet = new HttpGet(url);
			httpResponse = httpClient.execute(httpGet);
		}
		int responseCode = httpResponse.getStatusLine().getStatusCode();
		if (responseCode != HttpStatus.SC_OK){
			throw new RuntimeException("請求響應失敗，響應碼：" + responseCode + "！");
		}
		HttpEntity httpEntity = httpResponse.getEntity();
		return (httpEntity == null) ? null : EntityUtils.toString(httpEntity, "UTF-8");
	}
}



import java.security.GeneralSecurityException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpParams;

public class SSLDefaultHttpClient extends DefaultHttpClient {
	public SSLDefaultHttpClient(HttpParams httpParams) throws GeneralSecurityException {
		super(httpParams);
		SSLContext ctx = SSLContext.getInstance("TLS");
		X509TrustManager tm = new X509TrustManager() {
			@Override
			public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
			}

			@Override
			public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
			}

			@Override
			public X509Certificate[] getAcceptedIssuers() {
				return null;
			}
		};
		ctx.init(null, new TrustManager[] { tm }, null);
		SSLSocketFactory ssf = new SSLSocketFactory(ctx, SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
		ClientConnectionManager ccm = this.getConnectionManager();
		SchemeRegistry sr = ccm.getSchemeRegistry();
		sr.register(new Scheme("https", 443, ssf));
	}
}