package com.sw;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.Map;
import java.util.Map.Entry;

/**
 * @author Czy
 * @time Jul 6, 2019
 * @detail Http请求类
 */

public class Http {

 public static String httpRequest(String url, Map<String, String> param, String method, Map<String, String> headers) {
 String paramDipose = pramHandle(param);
 if (method.equalsIgnoreCase("GET")) {
 return doGet(url + paramDipose, headers);
 } else {
 return doPost(url, paramDipose, headers);
 }
 }

 private static String pramHandle(Map<String, String> params) {
 StringBuilder urlParam = new StringBuilder("?");
 ;
 for (Entry<String, String> param : params.entrySet()) {
 urlParam.append(param.getKey() + "=" + param.getValue() + "&");
 }
 return urlParam.toString();
 }

 private static String doGet(String httpurl, Map<String, String> headers) {
 HttpURLConnection connection = null;
 String result = null;// 返回结果字符串
 try {
 // 创建远程url连接对象
 URL url = new URL(httpurl);
 // 通过远程url连接对象打开一个连接,强转成httpURLConnection类
 connection = (HttpURLConnection) url.openConnection();
 // 设置连接方式:get
 connection.setRequestMethod("GET");
 // 设置连接主机服务器的超时时间:15000毫秒
 connection.setConnectTimeout(15000);
 // 设置读取远程返回的数据时间:60000毫秒
 connection.setReadTimeout(60000);
 for (Entry<String, String> header : headers.entrySet()) {
 connection.setRequestProperty(header.getKey(), header.getValue());
 }
 // 发送请求
 connection.connect();
 // 通过connection连接,获取输入流
 if (connection.getResponseCode() == 200) result = getResult(connection);
 } catch (Exception e) {
 System.out.println(e.toString());
 }
 return result;
 }

 private static String doPost(String httpUrl, String param, Map<String, String> headers) {
 HttpURLConnection connection = null;
 OutputStream os = null;
 String result = null;
 try {
 URL url = new URL(httpUrl);
 connection = (HttpURLConnection) url.openConnection();
 connection.setRequestMethod("POST");
 connection.setConnectTimeout(15000);
 connection.setReadTimeout(60000);
 connection.setDoOutput(true);
 connection.setDoInput(true);
 for (Entry<String, String> header : headers.entrySet()) {
 connection.setRequestProperty(header.getKey(), header.getValue());
 }
 connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
 os = connection.getOutputStream();
 os.write(param.getBytes());
 if (connection.getResponseCode() == 200) result = getResult(connection);
 } catch (Exception e) {
 System.out.println(e.toString());
 } finally {
 if (null != os) {
 try {
 os.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 }
 return result;
 }

 private static String getResult(HttpURLConnection connection){
 InputStream is = null;
 BufferedReader br = null;
 StringBuilder sb = new StringBuilder();
 try {
 is = connection.getInputStream();
 br = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8));

 String temp = "";
 while ((temp = br.readLine()) != null) {
 sb.append(temp);
 }
 }catch (Exception e){
 e.printStackTrace();
 }finally {
 closeConn(br,is,connection);

 }
 return sb.toString();
 }

 private static void closeConn(BufferedReader br,InputStream is,HttpURLConnection connection){
 if (null != br) {
 try {
 br.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 if (null != is) {
 try {
 is.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 if(connection!=null){
 connection.disconnect();

 }
 }

}