java httpclient 接口_Java利用httpclient通过get调用接口

使用Apache HttpClient库可以很方便地在Java中完成HTTP请求。下面是一个示例代码，演示如何使用HttpClient库通过GET方法调用接口：

import org.apache.http.HttpEntity;
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.HttpClients;
import org.apache.http.util.EntityUtils;

public class HttpClientDemo {

    public static void main(String[] args) {
        String url = "https://example.com/api/getData";
        try (CloseableHttpClient httpclient = HttpClients.createDefault()) {
            HttpGet httpGet = new HttpGet(url);
            try (CloseableHttpResponse response = httpclient.execute(httpGet)) {
                HttpEntity entity = response.getEntity();
                if (entity != null) {
                    String result = EntityUtils.toString(entity);
                    System.out.println(result);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

这段代码首先创建了一个`CloseableHttpClient`对象。然后使用`HttpGet`对象来设置请求的URL，最后使用`httpclient.execute()`方法来执行请求。如果请求成功，就可以通过`response.getEntity()`方法获取响应的实体，并使用`EntityUtils.toString()`方法将其转换为字符串，最后输出到控制台。