作为一个web开发人员，对Http 请求，并不陌生。有时候，我们请求的时候，需要使用代码实现，一般情况，我们使用Apache Jakarta Common 下的子项目.的HttpClient.

可是我发现，在开发过成，很多情况，我们使用的功能，并不需要，想象中的需要HttpClient 的很多特性。而且，需要引用jar 。这边我们使用Java jdk自带的HttpsURLConnection.

而且，这个可以迁移到android项目封装成一个HttpUtils 方法。代码如下：

package com.xuanyuan.utils.http;

import java.io.ByteArrayOutputStream;

import java.io.DataOutputStream;

import java.io.InputStream;

import java.io.UnsupportedEncodingException;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLEncoder;

import java.nio.charset.Charset;

import java.security.cert.CertificateException;

import java.security.cert.X509Certificate;

import java.util.Map;

import javax.net.ssl.HostnameVerifier;

import javax.net.ssl.HttpsURLConnection;

import javax.net.ssl.SSLContext;

import javax.net.ssl.SSLSession;

import javax.net.ssl.SSLSocketFactory;

import javax.net.ssl.TrustManager;

import javax.net.ssl.X509TrustManager;

/**

 * HttpUtils帮助类

 * User: PunkLin林克澎

 * Email: lentr@sina.cn

 * Date: 2017-04-04

 */

public class HttpUtils {

	private static Charset charset=Charset.defaultCharset();

	private static final String TAG = "HttpUtils";

	//链接超时

	private static final int mReadTimeOut = 1000 * 10; // 10秒

	//链接超时

	private static final int mConnectTimeOut = 1000 * 5; // 5秒

	private static final String CHAR_SET = charset.displayName();

	private static final int mRetry = 2; // 默认尝试访问次数

	/**

	 * 处理访问字符串处理

	 * @param params

	 * @return

	 * @throws UnsupportedEncodingException

	 */

	private static String buildParams(Map<String,? extends Object> params) throws UnsupportedEncodingException{

		if(params ==null || params.isEmpty()){

			return null;

		}

		StringBuilder builder = new StringBuilder();

		for (Map.Entry<String, ? extends Object> entry : params.entrySet()) {

			if (entry.getKey() != null && entry.getValue() != null)

				builder.append(entry.getKey().trim()).append("=")

						.append(URLEncoder.encode(entry.getValue().toString(), CHAR_SET)).append("&");

		}

		if(builder.charAt(builder.length()-1)=='&'){

			builder.deleteCharAt(builder.length()-1);

		}

		return builder.toString();

	}

	/**

	 * 无参数的Get访问

	 * @param url

	 * @return

	 * @throws Exception

	 */

	public static String get(String url) throws Exception {

		return get(url, null);

	}

	/**

	 * 有参数的Get 访问

	 * @param url

	 * @param params

	 * @return

	 * @throws Exception

	 */

	public static String get(String url, Map<String, ? extends Object> params) throws Exception {

		return get(url, params, null);

	}

	/**

	 * 含有报文头的Get请求

	 * @param url

	 * @param params

	 * @param headers

	 * @return

	 * @throws Exception

	 */

	public static String get(String url, Map<String, ? extends Object> params, Map<String, String> headers) throws Exception {

		if (url == null || url.trim().length() == 0) {

			throw new Exception(TAG + ": url is null or empty!");

		}

		if (params != null && params.size() > 0) {

			if (!url.contains("?")) {

				url += "?";

			}

			if (url.charAt(url.length() - 1) != '?') {

				url += "&";

			}

			url += buildParams(params);

		}

		return tryToGet(url, headers);

	}

	private static String tryToGet(String url,Map<String,String> headers) throws Exception{

		int tryTime = 0;

		Exception ex = null;

		while (tryTime < mRetry) {

			try {

				return doGet(url, headers);

			} catch (Exception e) {

				if (e != null)

					ex = e;

				tryTime++;

			}

		}

		if (ex != null)

			throw ex;

		else

			throw new Exception("未知网络错误 ");

	}

	/**

	 * Get 请求实现方法 核心

	 * @param strUrl

	 * @param headers

	 * @return

	 * @throws Exception

	 */

	private static String doGet(String strUrl, Map<String, String> headers) throws Exception {

		HttpURLConnection connection = null;

		InputStream stream = null;

		try {

			connection = getConnection(strUrl);

			configConnection(connection);

			if (headers != null && headers.size() > 0) {

				for (Map.Entry<String, String> entry : headers.entrySet()) {

					connection.setRequestProperty(entry.getKey(), entry.getValue());

				}

			}

			connection.setInstanceFollowRedirects(true);

			connection.connect();

			stream = connection.getInputStream();

			ByteArrayOutputStream obs = new ByteArrayOutputStream();

			byte[] buffer = new byte[1024];

			for (int len = 0; (len = stream.read(buffer)) > 0;) {

				obs.write(buffer, 0, len);

			}

			obs.flush();

			obs.close();

			stream.close();

			return new String(obs.toByteArray());

		} finally {

			if (connection != null) {

				connection.disconnect();

			}

			if (stream != null) {

				stream.close();

			}

		}

	}

	/**

	 * Post 请求，无参数的请求

	 * @param url

	 * @return

	 * @throws Exception

	 */

	public static String post(String url) throws Exception {

		return post(url, null);

	}

	/**

	 * Post 请求，带参数的请求。

	 * @param url

	 * @param params

	 * @return

	 * @throws Exception

	 */

	public static String post(String url, Map<String, ? extends Object> params) throws Exception {

		return post(url, params, null);

	}

	/**

	 * Post 请求，带参数的请求，请求报文的

	 * @param url

	 * @param params

	 * @return

	 * @throws Exception

	 */

	public static String post(String url, Map<String, ? extends Object> params, Map<String, String> headers)

			throws Exception {

		if (url == null || url.trim().length() == 0) {

			throw new Exception(TAG + ":url is null or empty!");

		}

		if (params != null && params.size() > 0) {

			return tryToPost(url, buildParams(params), headers);

		} else {

			return tryToPost(url, null, headers);

		}

	}

	public static String post(String url, String content, Map<String, String> headers) throws Exception {

		return tryToPost(url, content, headers);

	}

	private static String tryToPost(String url, String postContent, Map<String, String> headers) throws Exception {

		int tryTime = 0;

		Exception ex = null;

		while (tryTime < mRetry) {

			try {

				return doPost(url, postContent, headers);

			} catch (Exception e) {

				if (e != null)

					ex = e;

				tryTime++;

			}

		}

		if (ex != null)

			throw ex;

		else

			throw new Exception("未知网络错误 ");

	}

	private static String doPost(String strUrl, String postContent, Map<String, String> headers) throws Exception {

		HttpURLConnection connection = null;

		InputStream stream = null;

		try {

			connection = getConnection(strUrl);

			configConnection(connection);

			if (headers != null && headers.size() > 0) {

				for (Map.Entry<String, String> entry : headers.entrySet()) {

					connection.setRequestProperty(entry.getKey(), entry.getValue());

				}

			}

			connection.setRequestMethod("POST");

			connection.setDoOutput(true);

			if (null != postContent && !"".equals(postContent)) {

				DataOutputStream dos = new DataOutputStream(connection.getOutputStream());

				dos.write(postContent.getBytes(CHAR_SET));

				dos.flush();

				dos.close();

			}

			stream = connection.getInputStream();

			ByteArrayOutputStream obs = new ByteArrayOutputStream();

			byte[] buffer = new byte[1024];

			for (int len = 0; (len = stream.read(buffer)) > 0;) {

				obs.write(buffer, 0, len);

			}

			obs.flush();

			obs.close();

			return new String(obs.toByteArray());

		} finally {

			if (connection != null) {

				connection.disconnect();

			}

			if (stream != null) {

				stream.close();

			}

		}

	}

	private static void configConnection(HttpURLConnection connection){

		if(connection==null){

			return;

		}

		connection.setReadTimeout(mReadTimeOut);

		connection.setConnectTimeout(mConnectTimeOut);

		connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

		connection.setRequestProperty("User-Agent",

				"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.146 Safari/537.36");

	}

	/**

	 * 根据输入的请求地址判断使用https 还是使用http 获取不同的HttpURLConnection.

	 * @param strUrl

	 * @return

	 * @throws Exception

	 */

	private static HttpURLConnection getConnection(String strUrl) throws Exception {

		if(strUrl == null){

			return null;

		}

		if(strUrl.toLowerCase().startsWith("https")){

			return getHttpsConnection(strUrl);

		}else{

			return getHttpConnection(strUrl);

		}

	}

	//获取HTTP

	private static HttpURLConnection getHttpConnection(String urlStr) throws Exception {

		URL url =new URL(urlStr);

		HttpURLConnection conn=(HttpURLConnection) url.openConnection();

		return conn;

	}

	private static HttpURLConnection getHttpsConnection(String urlStr) throws Exception {

		URL url =new URL(urlStr);

		HttpsURLConnection conn=(HttpsURLConnection) url.openConnection();

		conn.setHostnameVerifier(hnv);

		SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");

		if(sslContext != null){

			TrustManager[] tm={xtm};

			sslContext.init(null, tm, null);

			SSLSocketFactory ssf =sslContext.getSocketFactory();

			conn.setSSLSocketFactory(ssf);

		}

		return conn;

	}

	private static X509TrustManager xtm = 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;

		}

	};

	/**

	 * 用于主机名验证的基接口

	 */

	private static HostnameVerifier hnv = new HostnameVerifier() {

		 //验证主机名和服务器验证方案的匹配是可接受的。 可以接受返回true

		 public boolean verify(String hostname, SSLSession session) {

			return true;

		}

	};

}

这样，少了很多jar的引用。并且功能实现了 Https.

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