最近公司业务需要外汇转换，这里记录下汇率实时更新的处理方式
- 申请汇率API接口（这里用的是聚合数据的API，免费每天调用100次）
- 编程用到的语言（网站上有对应的基本测试代码）
- 新建测试项目，导入所需jar包（Myeclipse）
- 根据需求更改代码
- 调用成功（大功告成）
代码贴出来：
package com.goldatg.util;
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.HashMap;
import java.util.Map;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
/**
*
* @项目名称:@{project_name}
* @类名称:@{type_name}
* @类描述:
* @创建人:{user}
* @创建时间:2017-5-24下午4:02:35
*
* @修改人:
* @修改时间:2017-5-24下午4:02:35
* @修改备注:
* @version:
*/
public class ExchangeUtil {
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KEY
public static final String APPKEY ="*****************";
//1.常用汇率查询
public static void getRequestExchange(){
String result =null;
String url ="http://op.juhe.cn/onebox/exchange/query";//请求接口地址
Map params = new HashMap();//请求参数
params.put("key",APPKEY);//应用APPKEY(应用详细页查询)
try {
result =net(url, params, "GET");
JSONObject object = JSONObject.fromObject(result);
if(object.getInt("error_code")==0){
System.out.println(object.get("result"));
}else{
System.out.println(object.get("error_code")+":"+object.get("reason"));
}
} catch (Exception e) {
e.printStackTrace();
}
}
//2.货币列表
public static String getRequestCurrencyList(){
String result =null;
String url ="http://op.juhe.cn/onebox/exchange/list";//请求接口地址
String currencyList = null;//货币列表
Map params = new HashMap();//请求参数
params.put("key",APPKEY);//应用APPKEY(应用详细页查询)
try {
result =net(url, params, "GET");
JSONObject object = JSONObject.fromObject(result);
if(object.getInt("error_code")==0){
System.out.println(object.get("result"));
currencyList = object.get("result").toString();
}else{
System.out.println(object.get("error_code")+":"+object.get("reason"));
}
} catch (Exception e) {
e.printStackTrace();
}
return currencyList;
}
//3.实时汇率查询换算
public static String getRequestConversion(String currency){
String result =null;
String url ="http://op.juhe.cn/onebox/exchange/currency";//请求接口地址
String multiple = null;//转换后得到的倍数
Map params = new HashMap();//请求参数
params.put("from","USD");//转换汇率前的货币代码
params.put("to",currency);//转换汇率成的货币代码
params.put("key",APPKEY);//应用APPKEY(应用详细页查询)
try {
result =net(url, params, "GET");
JSONObject object = JSONObject.fromObject(result);//得到当前返回的结果
String str = object.get("result").toString();//根据键“result”得到值
JSONArray objArray = JSONArray.fromObject(str);//转换成JSON数组对象
multiple = (String) objArray.getJSONObject(0).get("result");//得到精确值
if(object.getInt("error_code")==0){
System.out.println(object.get("result"));
System.out.println(multiple);
}else{
System.out.println(object.get("error_code")+":"+object.get("reason"));
}
} catch (Exception e) {
e.printStackTrace();
}
return multiple;
}
public static void main(String[] args) {
}
/**
*
* @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));
} catch (Exception e) {
// TODO: handle exception
}
}
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();
}
}这里要注意的是：这里针对的是web项目，如要测试请新建一个Servlet在浏览器进行访问，控制台输出，得到的结果是JSONObject对象，根据不同的需求，进行分解转化java对象；
JSONObject所需6个jar包，如有需要点击这里可以免费下载http://download.csdn.net/detail/qq_33624284/9851046