java使用HttpClient进行post和get请求

向右看齐 2022-02-19 13:15 356阅读 0赞

今天在使用一个短信接口时总是提示我请求体为空，

我发送请求体的写法是：

URL url = new URL(requestUrl);
                HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
                conn.setSSLSocketFactory(ssf);
    
                conn.setDoOutput(true);
                conn.setDoInput(true);
                conn.setUseCaches(false);
                // 设置请求方式（GET/POST）
                conn.setRequestMethod(requestMethod);
                // 当outputStr不为null时向输出流写数据
                if (null != outputStr) {
                    OutputStream outputStream = conn.getOutputStream();
                    // 注意编码格式
                    outputStream.write(outputStr.getBytes("UTF-8"));
                    outputStream.close();
                }

显然使用 outputStream.write是不行的，然后我查了一下他们文档里提供的demo，发现使用的是HttpClient，于是查了一下HttpClient的写法

使用HttpClient发送post请求：

/**
    	 *
    	 * @param jsonObjStr 传入的内容（请求体）
    	 * @param url 链接
    	 * @param authorization 应要求需提供的验证值
    	 * @return
    	 */
    public static JSONObject httpPost(String jsonObjStr, String url, String authorization){
    		HttpPost post = null;
    		try {
    			HttpClient httpClient = HttpClientBuilder.create().build();
    
    			post = new HttpPost(url);
    			// 构造消息头
    			post.setHeader("Content-type", "application/json; charset=utf-8");
    			post.setHeader("Accept","application/json");
    			post.setHeader("Authorization",authorization);
    			// 设置超时时间
    			RequestConfig requestConfig = RequestConfig.custom()
    					.setConnectTimeout(5000).setConnectionRequestTimeout(1000)
    					.setSocketTimeout(5000).build();
    			post.setConfig(requestConfig);
    
    			// 构建消息实体
    			StringEntity entity = new StringEntity(jsonObjStr, Charset.forName("UTF-8"));
    			entity.setContentEncoding("UTF-8");
    			// 发送Json格式的数据请求
    			entity.setContentType("application/json");
    			post.setEntity(entity);
    
    			HttpResponse response = httpClient.execute(post);
    			//获取响应码
    			Integer status = response.getStatusLine().getStatusCode();
    			//这里的status返回的是http的状态码 比如200
    			logger.debug("Https请求返回状态码：[{}]",status);
    			//responseEntity才是真正收到的内容
    			HttpEntity responseEntity = response.getEntity();
    			String result = "";
    			if (responseEntity != null) {
    				result = EntityUtils.toString(responseEntity, "UTF-8");
    
    			}
    			EntityUtils.consume(responseEntity);
    			return JSONObject.parseObject(result);
    		} catch (Exception e) {
    			e.printStackTrace();
    		}finally{
    			if(post != null){
    				try {
    					post.releaseConnection();
    					Thread.sleep(500);
    				} catch (InterruptedException e) {
    					e.printStackTrace();
    				}
    			}
    		}
    		return null;
    	}

收到JSONObject对象，处理就行了

发送get请求：

/**
    	 * 发送get请求
    	 * @param url    路径
    	 * @return
    	 */
    	public static JSONObject httpGet(String url){
    		//get请求返回结果
    		JSONObject jsonResult = null;
    		try {
    			HttpClient client = HttpClientBuilder.create().build();
    			//发送get请求
    			HttpGet request = new HttpGet(url);
    			HttpResponse response = client.execute(request);
    
    			/**请求发送成功，并得到响应**/
    			if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
    				/**读取服务器返回过来的json字符串数据**/
    				String strResult = EntityUtils.toString(response.getEntity());
    				/**把json字符串转换成json对象**/
    				jsonResult = JSONObject.parseObject(strResult);
    				url = URLDecoder.decode(url, "UTF-8");
    			} else {
    				logger.error("get请求提交失败:" + url);
    			}
    		} catch (IOException e) {
    			logger.error("get请求提交失败:" + url, e);
    		}
    		return jsonResult;
    	}