使用Java编写HTTP客户端请求示例-蒲公英云

使用Java编写HTTP客户端请求示例

原创悠悠 2024-12-06 16:51 137阅读 0赞

在Java中，我们可以使用Apache HttpClient或者java.net.URLConnection来发送HTTP请求。以下是一个使用HttpClient的简单示例：

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.json.JSONObject;
public class HttpClientRequest {
    public static void main(String[] args) {
        // 创建HttpClient
        CloseableHttpClient httpClient = HttpClients.createDefault();
        try {
            // 发送GET请求
            HttpGet httpGet = new HttpGet("http://example.com"); // 替换为你要访问的URL
            // 获取响应
            CloseableHttpResponse response = httpClient.execute(httpGet);
            if (response.getStatusLine().getStatusCode() == 200) { // 如果状态码是200（表示成功）, 
                HttpEntity entity = response.getEntity(); // 获取实体内容
                if (entity != null && entity.getContentLength() > 0) { // 如果实体内容非空
                    String jsonString = EntityUtils.toString(entity, "UTF-8")); // 将实体内容转换为字符串
                    JSONObject jsonObject = new JSONObject(jsonString); // 将字符串解析为JSONObject
                    System.out.println(jsonObject); // 打印解析后的JSON对象
                }
            } else { // 如果状态码不是200
                System.out.println("Failed to fetch data. Status code: " + response.getStatusLine().getStatusCode());
            }
            // 关闭资源
            response.close();
            httpClient.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}