java代码发送http接口获取json数据的案例

最新推荐文章于 2023-11-21 22:51:05 发布

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本文提供了一个Java代码示例，演示如何发送HTTP GET请求到特定URL（http://www.weather.com.cn/data/cityinfo/101110701.html）并解析返回的JSON数据。通过使用HttpClient库建立连接，设置超时时间，并利用Gson库解析JSON响应，最终获取并打印出天气信息。

public class GetWheather {

	 
	
	public static String  getWeatherInfo(){
		   RequestConfig requestConfig = RequestConfig.custom()  
	             .setConnectTimeout(5000).setConnectionRequestTimeout(1000)  
	             .setSocketTimeout(5000).build(); 
		String httpUrl = "http://www.weather.com.cn/data/cityinfo/101110701.html";//http://www.weather.com.cn/data/cityinfo/101010100.html

		HttpGet httpGet = new HttpGet(httpUrl);// 创建get请求

		CloseableHttpClient httpClient = null;  

		CloseableHttpResponse response = null;  

		HttpEntity entity = null;  

		String responseContent = null;  
		 String str= null;
		try {  

		     // 创建默认的httpClient实例.  

		     httpClient = HttpClients.createDefault();  

		     httpGet.setConfig(requestConfig);  

		     // 执行请求  

		     response = httpClient.execute(httpGet);  

		     entity = response.getEntity();  

		     responseContent = EntityUtils.toString(entity, "UTF-8");  

		     
		     Gson gson = new Gson();  
		     JsonObject obj = new  JsonParser().parse(responseContent).getAsJsonObject();
		     JsonObject obj1 = (JsonObject) obj.get("weatherinfo") ;
		       str = obj1.get("weather").getAsString();
          System.out.println(str);
		 } catch (Exception e) {  
		     e.printStackTrace();  
		 } finally {  
		     try {  
		          // 关闭连接,释放资源  
		          if (response != null) {  
		               response.close();  
		           }  
		          if (httpClient != null) {  
		               httpClient.close();  
		          }  
		     } catch (IOException e) {  
		          e.printStackTrace();  
		     }  
		} 
		
		return str;
		}
	
}