package com.javaweb.third.baidu.util;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;

/**
 * http 工具类
 * @author wujiyue
 */
public class HttpUtil {
    public static String post(String requestUrl, String accessToken, String params) throws Exception {
        String generalUrl = requestUrl + "?access_token=" + accessToken;
        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", "application/x-www-form-urlencoded");
        connection.setRequestProperty("Connection", "Keep-Alive");
        //connection.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
        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.writeBytes(params);
        out.flush();
        out.close();

        // 建立实际的连接
        connection.connect();
        // 获取所有响应头字段
        Map<String, List<String>> headers = connection.getHeaderFields();

        // 定义 BufferedReader输入流来读取URL的响应
        BufferedReader in = null;
        if (requestUrl.contains("nlp")){
            in = new BufferedReader(new InputStreamReader(connection.getInputStream(), "GBK"));
        }
        else{
            in = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
        }
        String result = "";
        String getLine;
        while ((getLine = in.readLine()) != null) {
            result += getLine;
        }
        in.close();
        //System.out.println("result:" + result);
        return result;
    }
    public static String post(String requestUrl, String accessToken, String params,String contentType) throws Exception {
        String generalUrl = requestUrl + "?access_token=" + accessToken;
        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
        if(contentType!=null&&contentType.length()>0){
            connection.setRequestProperty("Content-Type", contentType);
        }else{
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        }
        connection.setRequestProperty("Connection", "Keep-Alive");
        //connection.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
        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.writeBytes(params);
        out.flush();
        out.close();

        // 建立实际的连接
        connection.connect();
        // 获取所有响应头字段
        Map<String, List<String>> headers = connection.getHeaderFields();
        // 遍历所有的响应头字段
        for (String key : headers.keySet()) {
            System.out.println(key + "--->" + headers.get(key));
        }
        // 定义 BufferedReader输入流来读取URL的响应
        BufferedReader in = null;
        if (requestUrl.contains("nlp")){
            in = new BufferedReader(new InputStreamReader(connection.getInputStream(), "GBK"));
        }
        else{
            in = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
        }
        String result = "";
        String getLine;
        while ((getLine = in.readLine()) != null) {
            result += getLine;
        }
        in.close();
        return result;
    }
}