Http、Https发送Get、Post请求

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

/**
 * 
 * @author shilei
 *
 * @time 2019年11月23日 下午4:10:56
 *
 * @desc Http、Https发送Get、Post请求
 */
public class HttpApi {
	/**
	 * 向指定URL发送GET方法的请求
	 *
	 * @param url   发送请求的URL
	 * @param param 请求参数是 name1=value1&name2=value2 的形式。
	 * @return URL 所代表远程资源的响应结果
	 */
	private static String sendGet(String url, String param, boolean isHttps) {
		if (isHttps)
			setUpHttpsURLConnection();

		StringBuffer result = new StringBuffer();
		BufferedReader in = null;
		try {
			if (ToolValid.isNotEmpty(param))
				url = url + "?" + param;

			URL realUrl = new URL(url);
			// 打开和URL之间的连接
			HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
			// 设置通用的请求属性
			conn.setRequestMethod("GET");// POST GET PUT DELETE
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			conn.setRequestProperty("Content-Type", "application/json;charset=utf-8");

			// 定义 BufferedReader输入流来读取URL的响应
			in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
			String line = "";
			while ((line = in.readLine()) != null) {
				result.append(line);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if (in != null)
					in.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return result.toString();
	}

	/**
	 * 向指定 URL 发送POST方法的请求
	 *
	 * @param url   发送请求的 URL
	 * @param param 请求参数是 name1=value1&name2=value2 的形式。
	 * @return 所代表远程资源的响应结果
	 */
	private static String sendPost(String url, String param, boolean isHttps) {
		if (isHttps)
			setUpHttpsURLConnection();

		PrintWriter out = null;
		BufferedReader in = null;
		StringBuffer result = new StringBuffer();
		try {
			URL realUrl = new URL(url);
			// 打开和URL之间的连接
			HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
			// 设置通用的请求属性
			conn.setRequestMethod("POST");// POST GET PUT DELETE
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			// 发送POST请求必须设置如下两行
			conn.setDoOutput(true);
			conn.setDoInput(true);

			out = new PrintWriter(conn.getOutputStream());
			out.print(param);
			out.flush();

			// 定义BufferedReader输入流来读取URL的响应
			in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
			String line = "";
			while ((line = in.readLine()) != null) {
				result.append(line);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if (out != null)
					out.close();
				if (in != null)
					in.close();
			} catch (IOException ex) {
				ex.printStackTrace();
			}
		}
		return result.toString();
	}

	// Http（Post方式）
	public static String sendPost(String url, String param) {
		return sendPost(url, param, false);
	}

	// Http（Get方式）
	public static String sendGet(String url, String param) {
		return sendGet(url, param, false);
	}

	// Https（Get方式）
	public static String sendHttpsGet(String url, String param) {
		return sendGet(url, param, true);
	}

	// Https（Post方式）
	public static String sendHttpsPost(String url, String param) {
		return sendPost(url, param, true);
	}

	/**
	 * 
	 * @desc 设置Https跳过证书验证
	 *
	 */
	private static void setUpHttpsURLConnection() {
		try {
			HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier() {
				@Override
				public boolean verify(String hostname, SSLSession session) {
					return true;
				}
			});
			SSLContext sc = SSLContext.getInstance("TLS");
			sc.init(null, new TrustManager[] { new X509TrustManager() {

				@Override
				public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
					// TODO Auto-generated method stub
				}

				@Override
				public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
					// TODO Auto-generated method stub
				}

				@Override
				public X509Certificate[] getAcceptedIssuers() {
					// TODO Auto-generated method stub
					return null;
				}

			} }, new SecureRandom());
			HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (KeyManagementException e) {
			e.printStackTrace();
		}
	}
}