package wjb.baidu.ai.utils;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * http 工具类
 */
public class HttpUtil {

	public static String post(String requestUrl, String accessToken, String params) throws Exception {
		String contentType = "application/x-www-form-urlencoded";
		return HttpUtil.post(requestUrl, accessToken, contentType, params);
	}

	public static String post(String requestUrl, String accessToken, String contentType, String params) throws Exception {
		String encoding = "UTF-8";
		if (requestUrl.contains("nlp")) {
			encoding = "GBK";
		}
		return HttpUtil.post(requestUrl, accessToken, contentType, params, encoding);
	}

	public static String post(String requestUrl, String accessToken, String contentType, String params, String encoding) throws Exception {
		String url = requestUrl + "?access_token=" + accessToken;
		return HttpUtil.postGeneralUrl(url, contentType, params, encoding);
	}

	public static String postGeneralUrl(String generalUrl, String contentType, String params, String encoding) throws Exception {
		URL url = new URL(generalUrl);
		// 打开和URL之间的连接
		HttpURLConnection connection = (HttpURLConnection) url.openConnection();
		connection.setRequestMethod("POST");
		// 设置通用的请求属性
		connection.setRequestProperty("Content-Type", contentType);
		connection.setRequestProperty("Connection", "Keep-Alive");
		connection.setUseCaches(false);
		connection.setDoOutput(true);
		connection.setDoInput(true);

		// 得到请求的输出流对象
		DataOutputStream out = new DataOutputStream(connection.getOutputStream());
		out.write(params.getBytes(encoding));
		out.flush();
		out.close();

		// 建立实际的连接
		connection.connect();
		// 定义 BufferedReader输入流来读取URL的响应
		BufferedReader in = null;
		in = new BufferedReader(new InputStreamReader(connection.getInputStream(), encoding));
		String result = "";
		String getLine;
		while ((getLine = in.readLine()) != null) {
			result += getLine;
		}
		in.close();
		return result;
	}
}