JAVA利用HttpClient发送http请求

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最新推荐文章于 2025-07-07 20:52:55 发布

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分类专栏： Java httpclient 文章标签： java httpclient

本文链接：https://blog.youkuaiyun.com/fay462298322/article/details/67636704

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本文介绍HttpClient5的同步客户端实现GET请求的方法，并通过自定义响应处理器简化资源释放过程。展示了如何创建请求、执行并处理响应。

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HttpClient官网
这里只是给自己做个笔记，记住有这个东西，看到此文章的人建议去官网学习使用
下面是官网简单的例子：

package org.apache.hc.client5.http.examples;

import java.io.IOException;

import org.apache.hc.client5.http.impl.sync.CloseableHttpClient;
import org.apache.hc.client5.http.impl.sync.HttpClients;
import org.apache.hc.client5.http.methods.HttpGet;
import org.apache.hc.client5.http.protocol.ClientProtocolException;
import org.apache.hc.client5.http.sync.ResponseHandler;
import org.apache.hc.core5.http.HttpEntity;
import org.apache.hc.core5.http.HttpResponse;
import org.apache.hc.core5.http.ParseException;
import org.apache.hc.core5.http.entity.EntityUtils;

/**
 * This example demonstrates the use of the {@link ResponseHandler} to simplify
 * the process of processing the HTTP response and releasing associated resources.
 */
public class ClientWithResponseHandler {

    public final static void main(String[] args) throws Exception {
        try (CloseableHttpClient httpclient = HttpClients.createDefault()) {
            HttpGet httpget = new HttpGet("http://httpbin.org/get");

            System.out.println("Executing request " + httpget.getRequestLine());

            // Create a custom response handler
            ResponseHandler<String> responseHandler = new ResponseHandler<String>() {

                @Override
                public String handleResponse(
                        final HttpResponse response) throws IOException {
                    int status = response.getStatusLine().getStatusCode();
                    if (status >= 200 && status < 300) {
                        HttpEntity entity = response.getEntity();
                        try {
                            return entity != null ? EntityUtils.toString(entity) : null;
                        } catch (ParseException ex) {
                            throw new ClientProtocolException(ex);
                        }
                    } else {
                        throw new ClientProtocolException("Unexpected response status: " + status);
                    }
                }

            };
            String responseBody = httpclient.execute(httpget, responseHandler);
            System.out.println("----------------------------------------");
            System.out.println(responseBody);
        }
    }

}

MAVEN依赖：

<dependency>                                                                                    <groupId>org.apache.httpcomponents.client5</groupId>
<artifactId>httpclient5</artifactId>
<version>5.0-alpha1</version>
</dependency>