package cn.juhe;

import net.sf.json.JSONObject;

import java.io.*; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLEncoder; import java.nio.charset.StandardCharsets; import java.util.HashMap; import java.util.Map;

public class SimpleWeather {

讯享网

讯享网</span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 天气情况查询接口地址</span> <span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">static</span> String API_URL = "http://apis.juhe.cn/simpleWeather/query"<span style="color: rgba(0, 0, 0, 1)">; </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 接口请求Key</span> <span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">static</span> String API_KEY = "xxxxxxxxxxxxxx"<span style="color: rgba(0, 0, 0, 1)">; </span><span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">static</span> <span style="color: rgba(0, 0, 255, 1)">void</span><span style="color: rgba(0, 0, 0, 1)"> main(String[] args) { String cityName </span>= "北京"<span style="color: rgba(0, 0, 0, 1)">; queryWeather(cityName); } </span><span style="color: rgba(0, 128, 0, 1)">/</span><span style="color: rgba(0, 128, 0, 1)"> * 根据城市名查询天气情况 * * </span><span style="color: rgba(128, 128, 128, 1)">@param</span><span style="color: rgba(0, 128, 0, 1)"> cityName </span><span style="color: rgba(0, 128, 0, 1)">*/</span> <span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">static</span> <span style="color: rgba(0, 0, 255, 1)">void</span><span style="color: rgba(0, 0, 0, 1)"> queryWeather(String cityName) { Map</span>&lt;String, Object&gt; params = <span style="color: rgba(0, 0, 255, 1)">new</span> HashMap&lt;&gt;();<span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">组合参数</span> params.put("city"<span style="color: rgba(0, 0, 0, 1)">, cityName); params.put(</span>"key"<span style="color: rgba(0, 0, 0, 1)">, API_KEY); String queryParams </span>=<span style="color: rgba(0, 0, 0, 1)"> urlencode(params); String response </span>=<span style="color: rgba(0, 0, 0, 1)"> doGet(API_URL, queryParams); </span><span style="color: rgba(0, 0, 255, 1)">try</span><span style="color: rgba(0, 0, 0, 1)"> { JSONObject jsonObject </span>=<span style="color: rgba(0, 0, 0, 1)"> JSONObject.fromObject(response); </span><span style="color: rgba(0, 0, 255, 1)">int</span> error_code = jsonObject.getInt("error_code"<span style="color: rgba(0, 0, 0, 1)">); </span><span style="color: rgba(0, 0, 255, 1)">if</span> (error_code == 0<span style="color: rgba(0, 0, 0, 1)">) { System.out.println(</span>"调用接口成功"<span style="color: rgba(0, 0, 0, 1)">); JSONObject result </span>= jsonObject.getJSONObject("result"<span style="color: rgba(0, 0, 0, 1)">); JSONObject realtime </span>= result.getJSONObject("realtime"<span style="color: rgba(0, 0, 0, 1)">); System.out.printf(</span>"城市：%s%n", result.getString("city"<span style="color: rgba(0, 0, 0, 1)">)); System.out.printf(</span>"天气：%s%n", realtime.getString("info"<span style="color: rgba(0, 0, 0, 1)">)); System.out.printf(</span>"温度：%s%n", realtime.getString("temperature"<span style="color: rgba(0, 0, 0, 1)">)); System.out.printf(</span>"湿度：%s%n", realtime.getString("humidity"<span style="color: rgba(0, 0, 0, 1)">)); System.out.printf(</span>"风向：%s%n", realtime.getString("direct"<span style="color: rgba(0, 0, 0, 1)">)); System.out.printf(</span>"风力：%s%n", realtime.getString("power"<span style="color: rgba(0, 0, 0, 1)">)); System.out.printf(</span>"空气质量：%s%n", realtime.getString("aqi"<span style="color: rgba(0, 0, 0, 1)">)); } </span><span style="color: rgba(0, 0, 255, 1)">else</span><span style="color: rgba(0, 0, 0, 1)"> { System.out.println(</span>"调用接口失败：" + jsonObject.getString("reason"<span style="color: rgba(0, 0, 0, 1)">)); } } </span><span style="color: rgba(0, 0, 255, 1)">catch</span><span style="color: rgba(0, 0, 0, 1)"> (Exception e) { e.printStackTrace(); } } </span><span style="color: rgba(0, 128, 0, 1)">/</span><span style="color: rgba(0, 128, 0, 1)"> * get方式的http请求 * * </span><span style="color: rgba(128, 128, 128, 1)">@param</span><span style="color: rgba(0, 128, 0, 1)"> httpUrl 请求地址 * </span><span style="color: rgba(128, 128, 128, 1)">@return</span><span style="color: rgba(0, 128, 0, 1)"> 返回结果 </span><span style="color: rgba(0, 128, 0, 1)">*/</span> <span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">static</span><span style="color: rgba(0, 0, 0, 1)"> String doGet(String httpUrl, String queryParams) { HttpURLConnection connection </span>= <span style="color: rgba(0, 0, 255, 1)">null</span><span style="color: rgba(0, 0, 0, 1)">; InputStream inputStream </span>= <span style="color: rgba(0, 0, 255, 1)">null</span><span style="color: rgba(0, 0, 0, 1)">; BufferedReader bufferedReader </span>= <span style="color: rgba(0, 0, 255, 1)">null</span><span style="color: rgba(0, 0, 0, 1)">; String result </span>= <span style="color: rgba(0, 0, 255, 1)">null</span>;<span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 返回结果字符串</span> <span style="color: rgba(0, 0, 255, 1)">try</span><span style="color: rgba(0, 0, 0, 1)"> { </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 创建远程url连接对象</span> URL url = <span style="color: rgba(0, 0, 255, 1)">new</span> URL(<span style="color: rgba(0, 0, 255, 1)">new</span> StringBuffer(httpUrl).append("?"<span style="color: rgba(0, 0, 0, 1)">).append(queryParams).toString()); </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 通过远程url连接对象打开一个连接，强转成httpURLConnection类</span> connection =<span style="color: rgba(0, 0, 0, 1)"> (HttpURLConnection) url.openConnection(); </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 设置连接方式：get</span> connection.setRequestMethod("GET"<span style="color: rgba(0, 0, 0, 1)">); </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 设置连接主机服务器的超时时间：15000毫秒</span> connection.setConnectTimeout(5000<span style="color: rgba(0, 0, 0, 1)">); </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 设置读取远程返回的数据时间：60000毫秒</span> connection.setReadTimeout(6000<span style="color: rgba(0, 0, 0, 1)">); </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 发送请求</span> 

connection.connect();

 </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 通过connection连接，获取输入流</span> <span style="color: rgba(0, 0, 255, 1)">if</span> (connection.getResponseCode() == 200<span style="color: rgba(0, 0, 0, 1)">) { inputStream </span>=<span style="color: rgba(0, 0, 0, 1)"> connection.getInputStream(); </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 封装输入流，并指定字符集</span> bufferedReader = <span style="color: rgba(0, 0, 255, 1)">new</span> BufferedReader(<span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> InputStreamReader(inputStream, StandardCharsets.UTF_8)); </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 存放数据</span> StringBuilder sbf = <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> StringBuilder(); String temp; </span><span style="color: rgba(0, 0, 255, 1)">while</span> ((temp = bufferedReader.readLine()) != <span style="color: rgba(0, 0, 255, 1)">null</span><span style="color: rgba(0, 0, 0, 1)">) { sbf.append(temp); sbf.append(System.getProperty(</span>"line.separator"<span style="color: rgba(0, 0, 0, 1)">)); } result </span>=<span style="color: rgba(0, 0, 0, 1)"> sbf.toString(); } } </span><span style="color: rgba(0, 0, 255, 1)">catch</span><span style="color: rgba(0, 0, 0, 1)"> (IOException e) { e.printStackTrace(); } </span><span style="color: rgba(0, 0, 255, 1)">finally</span><span style="color: rgba(0, 0, 0, 1)"> { </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 关闭资源</span> <span style="color: rgba(0, 0, 255, 1)">if</span> (<span style="color: rgba(0, 0, 255, 1)">null</span> !=<span style="color: rgba(0, 0, 0, 1)"> bufferedReader) { </span><span style="color: rgba(0, 0, 255, 1)">try</span><span style="color: rgba(0, 0, 0, 1)"> { bufferedReader.close(); } </span><span style="color: rgba(0, 0, 255, 1)">catch</span><span style="color: rgba(0, 0, 0, 1)"> (IOException e) { e.printStackTrace(); } } </span><span style="color: rgba(0, 0, 255, 1)">if</span> (<span style="color: rgba(0, 0, 255, 1)">null</span> !=<span style="color: rgba(0, 0, 0, 1)"> inputStream) { </span><span style="color: rgba(0, 0, 255, 1)">try</span><span style="color: rgba(0, 0, 0, 1)"> { inputStream.close(); } </span><span style="color: rgba(0, 0, 255, 1)">catch</span><span style="color: rgba(0, 0, 0, 1)"> (IOException e) { e.printStackTrace(); } } </span><span style="color: rgba(0, 0, 255, 1)">if</span> (connection != <span style="color: rgba(0, 0, 255, 1)">null</span><span style="color: rgba(0, 0, 0, 1)">) { connection.disconnect();</span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 关闭远程连接</span> 

}

讯享网 } </span><span style="color: rgba(0, 0, 255, 1)">return</span><span style="color: rgba(0, 0, 0, 1)"> result; } </span><span style="color: rgba(0, 128, 0, 1)">/</span><span style="color: rgba(0, 128, 0, 1)"> * 将map型转为请求参数型 * * </span><span style="color: rgba(128, 128, 128, 1)">@param</span><span style="color: rgba(0, 128, 0, 1)"> data * </span><span style="color: rgba(128, 128, 128, 1)">@return</span> <span style="color: rgba(0, 128, 0, 1)">*/</span> <span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">static</span> String urlencode(Map&lt;String, ?&gt;<span style="color: rgba(0, 0, 0, 1)"> data) { StringBuilder sb </span>= <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> StringBuilder(); </span><span style="color: rgba(0, 0, 255, 1)">for</span> (Map.Entry&lt;String, ?&gt;<span style="color: rgba(0, 0, 0, 1)"> i : data.entrySet()) { </span><span style="color: rgba(0, 0, 255, 1)">try</span><span style="color: rgba(0, 0, 0, 1)"> { sb.append(i.getKey()).append(</span>"=").append(URLEncoder.encode(i.getValue() + "", "UTF-8")).append("&amp;"<span style="color: rgba(0, 0, 0, 1)">); } </span><span style="color: rgba(0, 0, 255, 1)">catch</span><span style="color: rgba(0, 0, 0, 1)"> (UnsupportedEncodingException e) { e.printStackTrace(); } } String result </span>=<span style="color: rgba(0, 0, 0, 1)"> sb.toString(); result </span>= result.substring(0, result.lastIndexOf("&amp;"<span style="color: rgba(0, 0, 0, 1)">)); </span><span style="color: rgba(0, 0, 255, 1)">return</span><span style="color: rgba(0, 0, 0, 1)"> result; } 

}