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;}
}