httpclient5发送post请求，和get请求，java代码详细示例，封装成方法

好的，以下是使用HttpClient5发送POST和GET请求的Java代码示例：

import org.apache.hc.client5.http.classic.methods.HttpGet;
import org.apache.hc.client5.http.classic.methods.HttpPost;
import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
import org.apache.hc.client5.http.impl.classic.HttpClients;
import org.apache.hc.core5.http.ClassicHttpResponse;
import org.apache.hc.core5.http.ContentType;
import org.apache.hc.core5.http.io.entity.StringEntity;

import java.io.IOException;
import java.net.URI;

public class HttpClientUtils {

    /**
     * 发送GET请求
     *
     * @param url 请求的URL
     * @return 响应字符串
     * @throws IOException
     */
    public static String sendGetRequest(String url) throws IOException {
        try (CloseableHttpClient httpClient = HttpClients.createDefault()) {
            HttpGet httpGet = new HttpGet(url);
            ClassicHttpResponse response = httpClient.execute(httpGet);
            return response.getEntity().toString();
        }
    }

    /**
     * 发送POST请求
     *
     * @param url    请求的URL
     * @param params 请求参数（JSON格式）
     * @return 响应字符串
     * @throws IOException
     */
    public static String sendPostRequest(String url, String params) throws IOException {
        try (CloseableHttpClient httpClient = HttpClients.createDefault()) {
            HttpPost httpPost = new HttpPost(URI.create(url));
            StringEntity requestEntity = new StringEntity(params, ContentType.APPLICATION_JSON);
            httpPost.setEntity(requestEntity);
            ClassicHttpResponse response = httpClient.execute(httpPost);
            return response.getEntity().toString();
        }
    }
}

这里我们使用了Apache HttpClient5库来发送请求，通过封装成方法，可以方便地在其他地方调用。注意，在使用完CloseableHttpClient后，一定要关闭它，否则可能会导致连接泄露和资源浪费。在上面的示例中，我们使用了try-with-resources语法糖来自动关闭CloseableHttpClient。