具体的看代码吧:代码即文档

import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.PrintWriter;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLEncoder;import java.security.SecureRandom;import java.security.cert.CertificateException;import java.security.cert.X509Certificate;import java.util.Map;import java.util.Set;import javax.net.ssl.HttpsURLConnection;import javax.net.ssl.SSLContext;import javax.net.ssl.SSLSocketFactory;import javax.net.ssl.TrustManager;import javax.net.ssl.X509TrustManager;/** * http请求 *  * @author taihei * */public class MyHttpReq {	/**	 *  GET请求 (自动识别是否使用SSL)	 * @param uri 网址(完整路径,可拼接参数)	 * @param params （可为null）	 * @return	 */	public static String httpGetReq(String uri, Map
    
      params) {		if (null == uri || uri.replace(" ", "").length() < 10				|| (!uri.startsWith("http://") && !uri.startsWith("https://"))) {//一个合法的网址至少为10位（需以http开头）			return "error:URI非法";		}		uri = paramsHandle4Get(uri, params);		try {			URL url = new URL(uri);			//p判断是否需要https请求			if (uri.startsWith("https://")) {				SSLSocketFactory sslf = defaultSSLFactory();				HttpsURLConnection urlSslConnection = (HttpsURLConnection) url.openConnection();				urlSslConnection.setSSLSocketFactory(sslf);				urlSslConnection.setRequestMethod("GET");				urlSslConnection.setRequestProperty("Accept", "application/json");				return returnDataHandle4UrlSSLConnection(urlSslConnection);			} else {				// 打开连接 HttpURLConnection是URLConnection的子类				HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();				//默认返回值格式为json				urlConnection.setRequestProperty("Accept", "application/json");				return returnDataHandle4UrlConnection(urlConnection);			}		} catch (IOException e) {			e.printStackTrace();		}		return "error: 请求失败";	}	/**	 * 对get请求的参数进行Url拼接处理	 * @param uri	 * @param params	 * @return	 */	private static String paramsHandle4Get(String uri, Map
     
       params) {		// 对参数进行处理		if (null != params && !params.isEmpty()) {			Set
      
        ks = params.keySet();			StringBuilder sb = new StringBuilder();			for (String key : ks) {				try {					sb.append(key + "=" + URLEncoder.encode(params.get(key).toString(), "UTF-8") + "&");//内容用url编码				} catch (UnsupportedEncodingException e) {					e.printStackTrace();				}			}			String pj = sb.substring(0, sb.length() - 1);			if (pj.length() > 0) {				if (uri.contains("?")) {					uri = uri + "&" + pj;				} else {					uri = uri + "?" + pj;				}			}		}		return uri;	}	/**	 * 	 * post请求(自动识别是否用ssl请求)	 * 	 * 	 * @param uri  请求地址	 * @param content  内容(json格式)	 * @return （若请求失败，则返回以 "error:"为开头的字符串）	 */	public static String httpPostReq(String uri, String content) {		if (null == uri || uri.replace(" ", "").length() < 10				|| (!uri.startsWith("http://") && !uri.startsWith("https://"))) {//一个合法的网址至少为10位（需以http开头）			return "error:URI非法";		}		try {			URL url = new URL(uri);			//判断是否要求https请求			if (uri.startsWith("https://")) {				SSLSocketFactory sslf = defaultSSLFactory();				HttpsURLConnection urlSslConnection = (HttpsURLConnection) url.openConnection();				urlSslConnection.setSSLSocketFactory(sslf);				urlSslConnection.setRequestMethod("POST");				urlSslConnection.setDoInput(true);				urlSslConnection.setDoOutput(true);				urlSslConnection.setUseCaches(false);// Post 请求不使用缓存				urlSslConnection.setRequestProperty("Accept", "application/json");//优先接收json数据				urlSslConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");//form表单提交				// 如果需要发送数据				if (null != content && content.trim().length() > 0) {					PrintWriter printWriter = new PrintWriter(urlSslConnection.getOutputStream());					printWriter.write(content);					// flush输出流的缓冲					printWriter.flush();					printWriter.close();				}				return returnDataHandle4UrlSSLConnection(urlSslConnection);			} else {				// 打开连接 HttpURLConnection是URLConnection的子类				HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();				urlConnection.setRequestMethod("POST");				// conn.setConnectTimeout(10000);//连接超时 单位毫秒				// conn.setReadTimeout(2000);//读取超时 单位毫秒				// 发送POST请求必须设置如下两行				urlConnection.setDoOutput(true);				urlConnection.setDoInput(true);				urlConnection.setUseCaches(false);// Post 请求不使用缓存				//				urlConnection.setRequestProperty("Accept", "application/xhtml+xml");//xml格式返回值				//默认返回值格式为json				urlConnection.setRequestProperty("Accept", "application/json");				urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");				// 如果需要发送数据				if (null != content && content.length() > 0) {					// 获取URLConnection对象对应的输出流					PrintWriter printWriter = new PrintWriter(urlConnection.getOutputStream());					// 发送请求参数					printWriter.write(content);					// flush输出流的缓冲					printWriter.flush();				}				return returnDataHandle4UrlConnection(urlConnection);			}		} catch (IOException e) {			e.printStackTrace();		}		return "error:请求失败";	}	/**	 * 读取输入流内的数据	 * @param is	 * @return	 * @throws IOException	 */	private static ByteArrayOutputStream getInputDataFromInputStrem(InputStream is) throws IOException {		ByteArrayOutputStream baos = new ByteArrayOutputStream();		byte[] buffer = new byte[1024];		int len = 0;		while (-1 != (len = is.read(buffer))) {			baos.write(buffer, 0, len);			baos.flush();		}		is.close();		return baos;	}	/**	 * post请求(自动识别是否用ssl请求)	 * 	 * @param uri  请求地址	 * @param params 参数 可为null	 * @return （若请求失败，则返回以 "error:"为开头的字符串）	 */	public static String httpPostReq(String uri, Map
       
         params) {		if (null == uri || uri.replace(" ", "").length() < 10				|| (!uri.startsWith("http://") && !uri.startsWith("https://"))) {//一个合法的网址至少为10位（需以http开头）			return "error:URI非法";		}		try {			URL url = new URL(uri);			//判断是否要求https请求			if (uri.startsWith("https://")) {				SSLSocketFactory sslf = defaultSSLFactory();				HttpsURLConnection urlSslConnection = (HttpsURLConnection) url.openConnection();				urlSslConnection.setSSLSocketFactory(sslf);				urlSslConnection.setRequestMethod("POST");				urlSslConnection.setDoInput(true);				urlSslConnection.setDoOutput(true);				urlSslConnection.setUseCaches(false);// Post 请求不使用缓存				urlSslConnection.setRequestProperty("Accept", "application/json");//优先接收json数据				urlSslConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");//form表单提交				// 如果需要发送数据				if (null != params && !params.isEmpty()) {					PrintWriter printWriter = new PrintWriter(urlSslConnection.getOutputStream());					printWriter.write(params.toString().replaceAll("[{|}]", ""));					// flush输出流的缓冲					printWriter.flush();					printWriter.close();				}				return returnDataHandle4UrlSSLConnection(urlSslConnection);			} else {				// 打开连接 HttpURLConnection是URLConnection的子类				HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();				urlConnection.setRequestMethod("POST");				// conn.setConnectTimeout(10000);//连接超时 单位毫秒				// conn.setReadTimeout(2000);//读取超时 单位毫秒				// 发送POST请求必须设置如下两行				urlConnection.setDoOutput(true);				urlConnection.setDoInput(true);				urlConnection.setUseCaches(false);// Post 请求不使用缓存				//				urlConnection.setRequestProperty("Accept", "application/xhtml+xml");//xml格式返回值				//默认返回值格式为json				urlConnection.setRequestProperty("Accept", "application/json");				urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");				// 如果需要发送数据				if (null != params && !params.isEmpty()) {					// 获取URLConnection对象对应的输出流					PrintWriter printWriter = new PrintWriter(urlConnection.getOutputStream());					// 发送请求参数					printWriter.write(params.toString().replaceAll("[{|}]", ""));					// flush输出流的缓冲					printWriter.flush();				}				return returnDataHandle4UrlConnection(urlConnection);			}		} catch (IOException e) {			e.printStackTrace();		}		return "error:请求失败";	}	/**	 * 处理https请求返回值	 * @param urlSslConnection	 * @return	 * @throws IOException	 * @throws UnsupportedEncodingException	 */	private static String returnDataHandle4UrlSSLConnection(HttpsURLConnection urlSslConnection)			throws IOException, UnsupportedEncodingException {		if (200 == urlSslConnection.getResponseCode()) {			// 得到输入流			InputStream is = urlSslConnection.getInputStream();			ByteArrayOutputStream baos = getInputDataFromInputStrem(is);			urlSslConnection.disconnect();			return baos.toString("utf-8");		} else {			return "error: " + urlSslConnection.getResponseCode();		}	}	/**	 * 处理http请求返回	 * @param urlConnection	 * @return	 * @throws IOException	 * @throws UnsupportedEncodingException	 */	private static String returnDataHandle4UrlConnection(HttpURLConnection urlConnection)			throws IOException, UnsupportedEncodingException {		if (200 == urlConnection.getResponseCode()) {			// 得到输入流			InputStream is = urlConnection.getInputStream();			ByteArrayOutputStream baos = getInputDataFromInputStrem(is);			urlConnection.disconnect();// 数据读取完毕关闭流			return baos.toString("utf-8");		} else {			return "error: " + urlConnection.getResponseCode();		}	}	/**	 * 创建一个默认的ssl工厂,(接受所有证书)	 * @return	 */	public static SSLSocketFactory defaultSSLFactory() {		X509TrustManager x509TrustManager = new X509TrustManager() {			@Override			public X509Certificate[] getAcceptedIssuers() {				return new X509Certificate[0];			}			@Override			public void checkServerTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {			}			@Override			public void checkClientTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {			}		};		SSLSocketFactory ssfFactory = null;		try {			SSLContext sc = SSLContext.getInstance("TLS");			sc.init(null, new TrustManager[] { x509TrustManager }, new SecureRandom());			ssfFactory = sc.getSocketFactory();		} catch (Exception e) {		}		return ssfFactory;	}}
       
      
     
    

其实这里面得代码还能再进行封装，