所需maven jar包

     			
      
       org.apache.httpcomponents
      			
      
       httpclient
      			
      
       4.4.1
      		
     		
     			
      
       org.apache.httpcomponents
      			
      
       httpcore
      			
      
       4.4.1
      		
     

　　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
     
       list = new ArrayList
      
       ();		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());