从HttpEntity获取JSON

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import com.fasterxml.jackson.databind.ObjectMapper;

public class HttpClientExample {
    public static void main(String[] args) {
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpGet httpGet = new HttpGet("http://example.com/api/data");
        
        try {
            HttpResponse response = httpClient.execute(httpGet);
            HttpEntity entity = response.getEntity();
            
            if (entity != null) {
                String jsonString = EntityUtils.toString(entity);
                ObjectMapper objectMapper = new ObjectMapper();
                JsonNode jsonNode = objectMapper.readTree(jsonString);
                
                // 处理JSON数据
                // ...
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}