package com.example;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.URL;

import java.net.URLConnection;

import java.util.List;

import java.util.Map;

import com.squareup.okhttp.OkHttpClient;

import com.squareup.okhttp.Request;

import com.squareup.okhttp.Response;

public class Testexchange {

    private static String source = "USD";

    private static String goal = "CNY";

    private static String money = "1200";

    private static String apiKey = "e9be757798f64552415b2de06b29f435";

    static String result = "";

    static BufferedReader in = null;

    public static void main(String[] args) throws IOException {

        getRate();

    }

    public static void getRateByOk() throws IOException{

        OkHttpClient client = new OkHttpClient();

        Request request = new Request.Builder()

                .url("http://a.apix.cn/apixmoney/exchangerate/exchange?source=" + source + "&goal=" + goal + "&money="

                        + money)

                .get().addHeader("accept", "application/json").addHeader("content-type", "application/json")

                .addHeader("apix-key", apiKey).build();

        Response response = null;

        try {

            response = client.newCall(request).execute();

        } catch (IOException e) {

            e.printStackTrace();

        }

        System.out.println(response.body().string());

    }

    public static void getRate() throws IOException {

        String mUrl = "http://a.apix.cn/apixmoney/exchangerate/exchange?source=" + source + "&goal=" + goal + "&money="

                + money;

        try {

            URL url = new URL(mUrl);

            URLConnection conn = url.openConnection();

            conn.setRequestProperty("connection", "Keep-Alive");

            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

            conn.setRequestProperty("accept", "application/json");

            conn.setRequestProperty("content-type", "application/json");

            conn.setRequestProperty("apix-key", apiKey);

            // 建立实际的连接

            conn.connect();

            // 获取所有响应头字段

            Map<String, List<String>> map = conn.getHeaderFields();

            // 遍历所有的响应头字段

            for (String key : map.keySet()) {

                System.out.println(key + "--->" + map.get(key));

            }

            // 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 += line;

            }

        } catch (Exception e) {

            System.out.println("发送GET请求出现异常！" + e);

            e.printStackTrace();

        }

        // 使用finally块来关闭输入流

        finally {

            try {

                if (in != null) {

                    in.close();

                    System.out.println(result);

                }

            } catch (Exception e2) {

                e2.printStackTrace();

            }

        }

    }

}

  /**

     * 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，请求参数应该是 name1=value1&name2=value2 的形式。

     * @return 所代表远程资源的响应结果

     */

    public static String sendPost(String url, String param) {

        PrintWriter out = null;

        BufferedReader in = null;

        String result = "";

        try {

            URL realUrl = new URL(url);

            // 打开和URL之间的连接

            URLConnection conn = realUrl.openConnection();

            // 设置通用的请求属性

            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);

            // 获取URLConnection对象对应的输出流

            out = new PrintWriter(conn.getOutputStream());

            // 发送请求参数

            out.print(param);

            // flush输出流的缓冲

            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 += line;

            }

        } catch (Exception e) {

            System.out.println("发送 POST 请求出现异常！"+e);

            e.printStackTrace();

        }

        //使用finally块来关闭输出流、输入流

        finally{

            try{

                if(out!=null){

                    out.close();

                }

                if(in!=null){

                    in.close();

                }

            }

            catch(IOException ex){

                ex.printStackTrace();

            }

        }

        return result;

    }

}