Java免费获取实时汇率API

最近在做项目，涉及到实时汇率的获取，查了很多方法。下面写下自己获取实时汇率的心得，希望帮到有需要的人。

我使用的是聚合数据，免费的货币汇率API https://www.juhe.cn/docs/api/id/23 。

首先要注册用户，进行实名认证后，申请到免费的APPKEY ，就可以使用货币汇率API了。

人民币碑价：

接口地址：http://web.juhe.cn:8080/finance/exchange/rmbquot

返回格式：json

请求方式：get

请求示例：http://web.juhe.cn:8080/finance/exchange/rmbquot?key=您申请的APPKEY

接口备注：100外币兑人民币，更新时间2分钟，此汇率仅供参考，以中国银行各分行实际交易汇率为准，不构成投资建议。投资者据此买卖，风险自担

名称	必填	类型	说明
key	是	String	APP Key
type	否	int	两种格式(0或者1,默认为0)
bank	否	int	(0:工商银行,1:招商银行,2:建设银行,3:中国银行,4:交通银行,5:农业银行,默认为:中国银行)

自己写的Java例子：

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.*;//注意：使用的是com.alibaba.fastjson.JSONArray ，不是net.sf.json.JSONObjec
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;public class CurrencyRate {public static final String DEF_CHATSET = "UTF-8";public static final int DEF_CONN_TIMEOUT = 30000;public static final int DEF_READ_TIMEOUT = 30000;public static String userAgent =  "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36";//配置您申请的APPKEYpublic static final String APPKEY ="**********************";static Double[] eRate = new Double[10];public static void main(String[] args) {String result1 =null;String url ="http://web.juhe.cn:8080/finance/exchange/rmbquot";//请求接口地址Map params = new HashMap();//请求参数params.put("key",APPKEY);//APP Keyparams.put("type","");//两种格式(0或者1,默认为0)try {result1 =net(url, params, "GET");//将字符串转化成JSON对象JSONObject object = JSONObject.parseObject(result1);//转化成JSON数组JSONArray resultList = object.getJSONArray("result");//取出JSON数组中的值for (int i=0; i<resultList.size();i++){// mBuyPri 是现钞买入价// USD美元JSONObject json = (JSONObject) resultList.get(i);String USD = json.getString("data1");System.out.println(USD);JSONObject rJson1 = (JSONObject) json.get("data1");eRate[1] = rJson1.getDouble("mBuyPri");System.out.println(eRate[1]);//EUP欧元String EUP = json.getString("data2");System.out.println(EUP);JSONObject rJson2 = (JSONObject) json.get("data2");eRate[2] = rJson2.getDouble("mBuyPri");System.out.println(eRate[2]);// HKD港币String HKD = json.getString("data3");System.out.println(HKD);JSONObject rJson3 = (JSONObject) json.get("data3");eRate[3] = rJson3.getDouble("mBuyPri");System.out.println(eRate[3]);//JPY日元String JPY = json.getString("data4");System.out.println(JPY);JSONObject rJson4 = (JSONObject) json.get("data4");eRate[4] = rJson4.getDouble("mBuyPri");System.out.println(eRate[4]);// GBP英镑String GBP = json.getString("data5");System.out.println(GBP);JSONObject rJson5 = (JSONObject) json.get("data5");eRate[5] = rJson5.getDouble("mBuyPri");System.out.println(eRate[5]);// THB泰国铢String THB = json.getString("data8");System.out.println(THB);JSONObject rJson6 = (JSONObject) json.get("data8");eRate[6] = rJson6.getDouble("mBuyPri");System.out.println(eRate[6]);// MOP澳门元String MOP = json.getString("data18");System.out.println(MOP);JSONObject rJson7 = (JSONObject) json.get("data18");eRate[7] = rJson7.getDouble("mBuyPri");System.out.println(eRate[7]);//KRW韩国元String KRW = json.getString("data21");System.out.println(KRW);JSONObject rJson8 = (JSONObject) json.get("data21");eRate[8] = rJson8.getDouble("mBuyPri");System.out.println(eRate[8]);}} catch (Exception e) {e.printStackTrace();}}/**** @param strUrl 请求地址* @param params 请求参数* @param method 请求方法* @return  网络请求字符串* @throws Exception*/public static String net(String strUrl, Map params,String method) throws Exception {HttpURLConnection conn = null;BufferedReader reader = null;String rs = null;try {StringBuffer sb = new StringBuffer();if(method==null || method.equals("GET")){strUrl = strUrl+"?"+urlencode(params);}URL url = new URL(strUrl);conn = (HttpURLConnection) url.openConnection();if(method==null || method.equals("GET")){conn.setRequestMethod("GET");}else{conn.setRequestMethod("POST");conn.setDoOutput(true);}conn.setRequestProperty("User-agent", userAgent);conn.setUseCaches(false);conn.setConnectTimeout(DEF_CONN_TIMEOUT);conn.setReadTimeout(DEF_READ_TIMEOUT);conn.setInstanceFollowRedirects(false);conn.connect();if (params!= null && method.equals("POST")) {try (DataOutputStream out = new DataOutputStream(conn.getOutputStream())) {out.writeBytes(urlencode(params));}}InputStream is = conn.getInputStream();reader = new BufferedReader(new InputStreamReader(is, DEF_CHATSET));String strRead = null;while ((strRead = reader.readLine()) != null) {sb.append(strRead);}rs = sb.toString();} catch (IOException e) {e.printStackTrace();} finally {if (reader != null) {reader.close();}if (conn != null) {conn.disconnect();}}return rs;}//将map型转为请求参数型public static String urlencode(Map<String,Object>data) {StringBuilder sb = new StringBuilder();for (Map.Entry i : data.entrySet()) {try {sb.append(i.getKey()).append("=").append(URLEncoder.encode(i.getValue()+"","UTF-8")).append("&");} catch (UnsupportedEncodingException e) {e.printStackTrace();}}return sb.toString();}}

输出结果：

JSON返回示例：

{
"resultcode":"200",
"reason":"SUCCESSED!",
"result":[{"data1":{"name":"英镑",                 /*货币名称*/"fBuyPri":"1001.430",           /*现汇买入价*/"mBuyPri":"970.510",           /*现钞买入价*/"fSellPri":"1009.480",             /*现汇卖出价*/"mSellPri":"1009.480",             /*现钞卖出价*/"bankConversionPri":"1014.870",        /*银行折算价/中间价*/"date":"2012-12-13",           /*发布日期*/"time":"16:25:49"               /*发布时间*/},"data2":{"name":"港币","fBuyPri":"80.210","mBuyPri":"79.570","fSellPri":"80.520","mSellPri":"80.520","bankConversionPri":"81.140","date":"2012-12-13","time":"16:25:49"},"data3":{"name":"美元","fBuyPri":"621.650","mBuyPri":"616.670","fSellPri":"624.150","mSellPri":"624.150","bankConversionPri":"628.870","date":"2012-12-13","time":"16:25:49"},"data4":{"name":"瑞士法郎","fBuyPri":"670.310","mBuyPri":"649.620","fSellPri":"675.700","mSellPri":"675.700","bankConversionPri":"674.350","date":"2012-12-13","time":"16:25:49"},"data5":{"name":"新加坡元","fBuyPri":"508.300","mBuyPri":"492.610","fSellPri":"512.390","mSellPri":"512.390","bankConversionPri":"512.000","date":"2012-12-13","time":"16:25:49"},"data6":{"name":"瑞典克朗","fBuyPri":"93.340","mBuyPri":"90.450","fSellPri":"94.090","mSellPri":"94.090","bankConversionPri":"93.770","date":"2012-12-13","time":"16:25:49"},"data7":{"name":"丹麦克朗","fBuyPri":"108.920","mBuyPri":"105.550","fSellPri":"109.790","mSellPri":"109.790","bankConversionPri":"109.430","date":"2012-12-13","time":"16:25:49"},"data8":{"name":"挪威克朗","fBuyPri":"110.490","mBuyPri":"107.080","fSellPri":"111.380","mSellPri":"111.380","bankConversionPri":"111.060","date":"2012-12-13","time":"16:25:49"},"data9":{"name":"日元","fBuyPri":"7.431","mBuyPri":"7.201","fSellPri":"7.483","mSellPri":"7.483","bankConversionPri":"7.531","date":"2012-12-13","time":"16:25:49"},"data10":{"name":"加拿大元","fBuyPri":"630.950","mBuyPri":"611.470","fSellPri":"636.010","mSellPri":"636.010","bankConversionPri":"638.800","date":"2012-12-13","time":"16:25:49"},"data11":{"name":"澳大利亚元","fBuyPri":"654.900","mBuyPri":"634.680","fSellPri":"660.160","mSellPri":"660.160","bankConversionPri":"663.300","date":"2012-12-13","time":"16:25:49"},"data12":{"name":"欧元","fBuyPri":"812.520","mBuyPri":"787.430","fSellPri":"819.040","mSellPri":"819.040","bankConversionPri":"821.960","date":"2012-12-13","time":"16:25:49"},"data13":{"name":"澳门元","fBuyPri":"77.910","mBuyPri":"75.300","fSellPri":"78.210","mSellPri":"80.720","bankConversionPri":"78.320","date":"2012-12-13","time":"16:25:49"},"data14":{"name":"菲律宾比索","fBuyPri":"15.100","mBuyPri":"14.640","fSellPri":"15.220","mSellPri":"15.690","bankConversionPri":"15.220","date":"2012-12-13","time":"16:25:49"},"data15":{"name":"泰国铢","fBuyPri":"20.240","mBuyPri":"19.620","fSellPri":"20.400","mSellPri":"21.030","bankConversionPri":"20.390","date":"2012-12-13","time":"16:25:49"},"data16":{"name":"新西兰元","fBuyPri":"524.400","mBuyPri":"0.000","fSellPri":"528.610","mSellPri":"0.000","bankConversionPri":"526.770","date":"2012-12-13","time":"16:25:49"},"data17":{"name":"韩国元","fBuyPri":"0.000","mBuyPri":"0.560","fSellPri":"0.000","mSellPri":"0.608","bankConversionPri":"0.586","date":"2012-12-13","time":"16:25:49"}}]
}

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