如何开启你的第一个httpClient程序呢？

转自：

 http://www.java265.com/JavaCourse/202205/3307.html

HttpClient:

        HttpClient 是Apache Jakarta Common 下的子项目，可以用来提供高效的、最新的、功能丰富的支持 HTTP 协议的客户端编程工具包，并且它支持 HTTP 协议最新的版本和建议

 HttpClient 主要功能:

（1）实现了所有 HTTP 的方法（GET,POST,PUT,HEAD 等）

（2）支持自动转向

（3）支持 HTTPS 协议

（4）支持代理服务器

下文笔者讲述第一个HttpClient程序的开发示例分享，如下所示:

实现思路:
    1.创建一个HttpClient
	2.定义一个httpRequest
	3.HttpClient.execute(request)
	4.获取httpClient运行后的结果

例:

package com.java265.other.httpClient;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;

import org.apache.hc.client5.http.classic.methods.HttpGet;
import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
import org.apache.hc.client5.http.impl.classic.CloseableHttpResponse;
import org.apache.hc.client5.http.impl.classic.HttpClients;
import org.apache.hc.core5.http.HttpEntity;

public class HttpClient01 {
	/*
	 * java265.com 第一个HttpClient示例
	 */
	public static void main(String[] args) throws Exception {

		try (CloseableHttpClient httpclient = HttpClients.createDefault()) {
			HttpGet httpGet = new HttpGet("http://www.java265.com");

			InputStream in = null;
			ByteArrayOutputStream bos = new ByteArrayOutputStream();

			try (CloseableHttpResponse response1 = httpclient.execute(httpGet)) {
				System.out.println(response1.getCode() + " " + response1.getReasonPhrase());
				HttpEntity entity1 = response1.getEntity();
				in = entity1.getContent();
				byte[] buffer = new byte[1024];
				int len = -1;
				while ((len = in.read(buffer)) != -1) {
					bos.write(buffer, 0, len);
				}
				
				System.out.println("output:" + bos.toString());

			}catch(Exception e) {
				System.out.println("message:" + e.getMessage());
			}finally {
				 if(null != in) {
						in.close();
				 }
				 
				 if(null != bos) {
						bos.close();
				 }
			}
		}
	}

}