java HttpClient 发送Http请求

所需maven jar包

                <dependency>
			<groupId>org.apache.httpcomponents</groupId>
			<artifactId>httpclient</artifactId>
			<version>4.4.1</version>
		</dependency>
		<dependency>
			<groupId>org.apache.httpcomponents</groupId>
			<artifactId>httpcore</artifactId>
			<version>4.4.1</version>
		</dependency>        

　　发出get请求，可调用外部rest接口：

@org.junit.Test
	public void testGet() throws IOException, Exception {
		//创建HttpClient客户端
		CloseableHttpClient httpClient = HttpClients.createDefault();
		//创建请求方式  post  get  http://localhost:8888/demo/test/
		
		String uri = "http://localhost:8888/demo/test/hello/cc/a";
		HttpGet httpGet = new HttpGet(uri);
		CloseableHttpResponse response = httpClient.execute(httpGet);
		//相应结果
		int statusCode = response.getStatusLine().getStatusCode();
		System.out.println(statusCode);
		
		HttpEntity entity = response.getEntity();
		
		String string = EntityUtils.toString(entity);
		
		System.out.println(string);
		
		response.close();
		httpClient.close();
		
	}

　　发出post请求，模拟表单发请求：

@org.junit.Test
	public void testPost() throws IOException, Exception {
		//创建HttpClient客户端
		CloseableHttpClient httpClient = HttpClients.createDefault();
		//创建请求方式  post  get  
		
		String uri = "http://localhost:8888/demo/test/testPost";
		HttpPost httpPost = new HttpPost(uri);
		
		//创建一个Entity，模拟一个表单
		List<NameValuePair> list = new ArrayList<NameValuePair>();
		list.add(new BasicNameValuePair("id", "1001"));
		list.add(new BasicNameValuePair("name", "小黑"));
		//把表单包装成一个HttpEntity对象
		HttpEntity stringEntity = new UrlEncodedFormEntity(list,"utf-8");
		//设置请求的内容
		httpPost.setEntity(stringEntity);
		
		CloseableHttpResponse response = httpClient.execute(httpPost);
		//相应结果
		int statusCode = response.getStatusLine().getStatusCode();
		System.out.println(statusCode);
		
		HttpEntity entity = response.getEntity();
		
		String string = EntityUtils.toString(entity);
		
		System.out.println(string);
		
		response.close();
		httpClient.close();
		
	}

　　get请求添加其他参数，可参照：

//创建一个uri对象
URIBuilder uriBuilder = new URIBuilder("http://www.sogou.com/web");
uriBuilder.addParameter("query","花千骨");
HttpGet get = new HttpGet(uriBuilder.build());