package com.jtools;

import java.io.BufferedReader;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.net.ConnectException;

import java.net.HttpURLConnection;

import java.net.URL;

import javax.net.ssl.HttpsURLConnection;

import javax.net.ssl.SSLContext;

import javax.net.ssl.SSLSocketFactory;

import javax.net.ssl.TrustManager;

/**

 * http工具类

 * @author json_wang

*/

public class HttpUtil {

	/**

	 * 发起http请求并获取结果

	 * @param requestUrl 请求地址

	 * @param requestMethod 请求方式（GET、POST）

	 * @param outputStr 提交的数据       格式（例子："name=name&age=age"）  // 正文，正文内容其实跟get的URL中 '? '后的参数字符串一致

	 * @return json字符串（json格式不确定 可能是JSONObject，也可能是JSONArray，这里用字符串，在controller里再转化）

	 */

	public static String httpRequest(String requestUrl, String requestMethod, String outputStr) {

		String resultStr = "";

		StringBuffer buffer = new StringBuffer();

		try {

			URL url = new URL(requestUrl);

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

			httpUrlConn.setDoOutput(true);

			httpUrlConn.setDoInput(true);

			httpUrlConn.setUseCaches(false);

			// 设置请求方式（GET/POST）

			httpUrlConn.setRequestMethod(requestMethod);

			//HttpURLConnection是基于HTTP协议的，其底层通过socket通信实现。如果不设置超时（timeout），在网络异常的情况下，可能会导致程序僵死而不继续往下执行

			httpUrlConn.setConnectTimeout(30*1000);//30s超时

			httpUrlConn.setReadTimeout(10*1000);//10s超时

			/*

			//设置请求属性

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

			httpUrlConn.setRequestProperty("Charset", "UTF-8");

		    */

			//HttpURLConnection的connect()函数，实际上只是建立了一个与服务器的tcp连接，并没有实际发送http请求。

			//get方式需要显式连接

			if ("GET".equalsIgnoreCase(requestMethod)){

				httpUrlConn.connect();

			}

			//这种post方式，隐式自动连接

			// 当有数据需要提交时

			if (null != outputStr) {

				OutputStream outputStream = httpUrlConn.getOutputStream();

				// 注意编码格式，防止中文乱码

				outputStream.write(outputStr.getBytes("UTF-8"));

				outputStream.close();

			}

			// 将返回的输入流转换成字符串

			InputStream inputStream = httpUrlConn.getInputStream();

			InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");

			BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

			String str = null;

			while ((str = bufferedReader.readLine()) != null) {

				buffer.append(str);

			}

			bufferedReader.close();

			inputStreamReader.close();

			// 释放资源

			inputStream.close();

			inputStream = null;

			httpUrlConn.disconnect();

			resultStr = buffer.toString();

		} catch (ConnectException ce) {

			System.out.println("server connection timed out.");

		} catch (Exception e) {

			System.out.println(requestUrl+" request error:\n"+e);

		}

		return resultStr;

	}

	/**

	 * 发起https请求并获取结果

	 *

	 * @param requestUrl 请求地址

	 * @param requestMethod 请求方式（GET、POST）

	 * @param outputStr 提交的数据       格式（例子："name=name&age=age"）  // 正文，正文内容其实跟get的URL中 '? '后的参数字符串一致

	 * @return json字符串（json格式不确定 可能是JSONObject，也可能是JSONArray，这里用字符串，在controller里再转化）

	 */

	public static String httpsRequest(String requestUrl, String requestMethod, String outputStr) {

		String resultStr = "";

		StringBuffer buffer = new StringBuffer();

		try {

			// 创建SSLContext对象，并使用我们指定的信任管理器初始化

			TrustManager[] tm = { new MyX509TrustManager() };

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

			sslContext.init(null, tm, new java.security.SecureRandom());

			// 从上述SSLContext对象中得到SSLSocketFactory对象

			SSLSocketFactory ssf = sslContext.getSocketFactory();

			URL url = new URL(requestUrl);

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

			httpUrlConn.setSSLSocketFactory(ssf);

			httpUrlConn.setDoOutput(true);

			httpUrlConn.setDoInput(true);

			httpUrlConn.setUseCaches(false);

			// 设置请求方式（GET/POST）

			httpUrlConn.setRequestMethod(requestMethod);

			//HttpURLConnection是基于HTTP协议的，其底层通过socket通信实现。如果不设置超时（timeout），在网络异常的情况下，可能会导致程序僵死而不继续往下执行

			httpUrlConn.setConnectTimeout(30*1000);//30s超时

			httpUrlConn.setReadTimeout(10*1000);//10s超时

			/*

			//设置请求属性

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

			httpUrlConn.setRequestProperty("Charset", "UTF-8");

		    */

			//HttpURLConnection的connect()函数，实际上只是建立了一个与服务器的tcp连接，并没有实际发送http请求。

			//get方式需要显式连接

			if ("GET".equalsIgnoreCase(requestMethod)){

				httpUrlConn.connect();

			}

			//这种post方式，隐式自动连接

			// 当有数据需要提交时

			if (null != outputStr) {

				OutputStream outputStream = httpUrlConn.getOutputStream();

				// 注意编码格式，防止中文乱码

				outputStream.write(outputStr.getBytes("UTF-8"));

				outputStream.close();

			}

			// 将返回的输入流转换成字符串

			InputStream inputStream = httpUrlConn.getInputStream();

			InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");

			BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

			String str = null;

			while ((str = bufferedReader.readLine()) != null) {

				buffer.append(str);

			}

			bufferedReader.close();

			inputStreamReader.close();

			// 释放资源

			inputStream.close();

			inputStream = null;

			httpUrlConn.disconnect();

			resultStr = buffer.toString();

		} catch (ConnectException ce) {

			System.out.println("server connection timed out.");

		} catch (Exception e) {

			System.out.println(requestUrl+" request error:\n"+e);

		}

		return resultStr;

	}

	public static void main(String[] args) {

		System.out.println(httpRequest("https://www.zhihu.com/", "GET", null));

	}

}

package com.jtools;

import java.security.cert.CertificateException;

import java.security.cert.X509Certificate;

import javax.net.ssl.X509TrustManager;

/**

 * 证书信任管理器（用于https请求）

 */

public class MyX509TrustManager implements X509TrustManager {

	public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {

	}

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

	}

	public X509Certificate[] getAcceptedIssuers() {

		return null;

	}

}