java版SmartWeatherAPI 获取天气信息 工具类

申请了天气预报信息接口，提供的接口文档是php的，我用java实现了

基于httpclient-4.3.5

package com.yxkong.utils;

import java.io.IOException;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import org.apache.http.HttpHeaders;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

import sun.misc.BASE64Encoder;

public class SmartWeatherUtil {
      private static final String MAC_NAME = "HmacSHA1";  
      private static final String ENCODING = "UTF-8";  
      private static final String appid = "你的appid";  
      private static final String private_key = "你的privatekey";  
      private static final String url_header="http://open.weather.com.cn/data/?"; 
      
      /** 
       * 使用 HMAC-SHA1 签名方法对对encryptText进行签名 
       * @param encryptText 被签名的字符串 
       * @param encryptKey  密钥 
       * @return 
       * @throws Exception 
       */  
      public static byte[] HmacSHA1Encrypt(String url, String privatekey) throws Exception   
      {         
        byte[] data=privatekey.getBytes(ENCODING);
        //根据给定的字节数组构造一个密钥,第二参数指定一个密钥算法的名称
          SecretKey secretKey = new SecretKeySpec(data, MAC_NAME); 
          //生成一个指定 Mac 算法 的 Mac 对象
          Mac mac = Mac.getInstance(MAC_NAME); 
          //用给定密钥初始化 Mac 对象
          mac.init(secretKey);  
          
          byte[] text = url.getBytes(ENCODING);  
          //完成 Mac 操作 
          return mac.doFinal(text);  
      }  
     
      /** 
       * 获取URL通过privatekey加密后的码 
       * @param url 
       * @param privatekey 
       * @return 
       * @throws Exception 
       */  
      private static String getKey(String url, String privatekey) throws Exception {  
          byte[] key_bytes = HmacSHA1Encrypt(url, privatekey);  
          return URLEncoder.encode(new BASE64Encoder().encode(key_bytes),ENCODING); 
      }  
      /** 
       * 组装url的地址
       * @param areaid 地区id
       * @param type   数据类型
       * @param date  时间
       * @return 
       * @throws Exception 
       */  
      private static String getInstanceURL(String areaid,String type,String date) throws Exception{  
          String keyurl=url_header+"areaid="+areaid+"&type="+type+"&date="+date+"&appid=";  
          String key=getKey(keyurl+appid,private_key);  
          String appid6 = appid.substring(0, 6);  
          return keyurl+appid6+"&key=" + key;  
      }  
      /**
       * 获取访问URL
       * @param areaid  地区编号
       * @param type   获取类型数:
       *               天气指数：index_f(基础) 、 index_v(常规)
                         3 天常规预报 (24 小时 ):forecast_f(基础 ) 、forecast_v (常规)
       * @return
       */
      public static String getActionURL(String areaid,String type){  
          SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddhhmm");  
          String date = dateFormat.format(new Date());  
          try {  
              return getInstanceURL(areaid,type,date);  
          } catch (Exception e) {  
          }  
          return null;  
      }  
      /**
       * 测试
       * @param args
       */
      public static void main(String[] args) {
      
        String interfaceURL = getActionURL("101010200", "forecast_v");
        CloseableHttpClient client = HttpClientBuilder.create().build(); 
        try {
          HttpGet request = new HttpGet(interfaceURL);  
          request.addHeader(HttpHeaders.ACCEPT, "application/json;charset=utf-8");
          CloseableHttpResponse response = client.execute(request);
          String bodyAsString = EntityUtils.toString(response.getEntity(),"utf-8");  
              response.close();
              System.err.println(bodyAsString);
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
}