java httpclient 工具类

以下是一个 Java 中使用 HttpClient 的工具类示例：

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
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 HttpClientUtil {

    public static String get(String url) throws IOException {
        // 创建 HttpClient 实例
        CloseableHttpClient httpClient = HttpClients.createDefault();
        // 创建 HttpGet 请求
        HttpGet httpGet = new HttpGet(url);
        // 执行请求
        CloseableHttpResponse response = httpClient.execute(httpGet);
        try {
            // 获取响应实体
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                // 将响应实体转换为字符串
                InputStream inputStream = entity.getContent();
                byte[] bytes = new byte[inputStream.available()];
                inputStream.read(bytes);
                return new String(bytes, StandardCharsets.UTF_8);
            }
        } finally {
            // 关闭响应
            response.close();
        }
        return null;
    }
}

使用示例：

public static void main(String[] args) throws IOException {
    String response = HttpClientUtil.get("https://www.baidu.com");
    System.out.println(response);
}

以上代码是一个简单的使用 HttpClient 发送 GET 请求的工具类示例，你可以根据自己的需求对其进行更改和扩展。