HttpClient的简单使用

HttpClient简介

HttpClient 是 Apache Jakarta Common 下的子项目，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。

GET请求

       @Test
	public void testGet() throws Exception{
		//创建一个httpclient对象
		CloseableHttpClient httpClient = HttpClients.createDefault();
		//创建一个uri对象
		URIBuilder uriBuilder = new URIBuilder("http://www.baidu.com ");
		uriBuilder.addParameter("query", "马世超");
		HttpGet get = new HttpGet(uriBuilder.build());
		//执行请求
		CloseableHttpResponse response = httpClient.execute(get);
		//取响应的结果
		int statusCode = response.getStatusLine().getStatusCode();
		System.out.println(statusCode);
		HttpEntity entity = response.getEntity();
		String string = EntityUtils.toString(entity, "utf-8");
		System.out.println(string);
		//关闭httpclient
		response.close();
		httpClient.close();
	}	

POST请求

	@Test
	public void testPost() throws Exception{
		CloseableHttpClient httpClient = HttpClients.createDefault();
		
		//创建一个post对象
		HttpPost post = new HttpPost("http://localhost:8080/httpclient/testpost.html");
		//创建一个Entity。模拟一个表单
		List kvList = new ArrayList<>();
		kvList.add(new BasicNameValuePair("username", "haha"));
		kvList.add(new BasicNameValuePair("password", "123456"));
		
		//包装成一个Entity对象
		StringEntity entity = new UrlEncodedFormEntity(kvList, "utf-8");
		//设置请求的内容
		post.setEntity(entity);
		
		//执行post请求
		CloseableHttpResponse response = httpClient.execute(post);
		String string = EntityUtils.toString(response.getEntity());
		System.out.println(string);
		response.close();
		httpClient.close();
	}