http请求工具类-优快云博客

  /**
     * 向指定 URL 发送GET方法的请求
     *
     * @param url 发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param)
    {
        StringBuilder result = new StringBuilder();
        BufferedReader in = null;
        try
        {
            String urlNameString = url + "?" + param;
            
            URL realUrl = new URL(urlNameString);
            URLConnection connection = realUrl.openConnection();
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            connection.connect();
            in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null)
            {
                result.append(line);
            }
          
        }
        
        catch (Exception e)
        {
           System.out.println("调用HttpsUtil.sendGet Exception ");
        }
        finally
        {
            try
            {
                if (in != null)
                {
                    in.close();
                }
            }
            catch (Exception ex)
            {
            	System.out.println("调用in.close Exception");
            }
        }
        return result.toString();
    }

/**
	 * 发送post请求
	 * 
	 * @param url        路径
	 * @param jsonObject 参数(json类型)
	 * @return
	 * @throws ParseException
	 * @throws IOException
	 */
	public static JSONObject sendPostJson(String url, JSONObject jsonObject)
			throws ParseException, IOException {
		String body = "";
		// 创建httpclient对象
		CloseableHttpClient client = HttpClients.createDefault();
		// 创建post方式请求对象
		HttpPost httpPost = new HttpPost(url);

		// 装填参数
		StringEntity s = new StringEntity(jsonObject.toString(), "utf-8");
		s.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
		// 设置参数到请求对象中
		httpPost.setEntity(s);
		System.out.println("请求地址：" + url);


		// 设置header信息
		// 指定报文头【Content-type】、【User-Agent】
		httpPost.setHeader("Content-type", "application/json");
		httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");

		// 执行请求操作，并拿到结果（同步阻塞）
		CloseableHttpResponse response = client.execute(httpPost);
		// 获取结果实体
		HttpEntity entity = response.getEntity();
		if (entity != null) {
			// 按指定编码转换结果实体为String类型
			body = EntityUtils.toString(entity, "UTF-8");
		}
		EntityUtils.consume(entity);
		// 释放链接
		response.close();
		JSONObject userMsgObject = JSONObject.parseObject(body);
		return userMsgObject;
	}

/**
	 * 向指定 URL 发送POST方法的请求
	 * 
	 * @param url   发送请求的 URL
	 * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
	 * @return 所代表远程资源的响应结果
	 */
	public static String sendPost(String url, String param) {
		PrintWriter out = null;
		BufferedReader in = null;
		String result = "";
		try {
			URL realUrl = new URL(url);
			// 打开和URL之间的连接
			URLConnection conn = realUrl.openConnection();
			// 设置通用的请求属性
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			// 发送POST请求必须设置如下两行
			conn.setDoOutput(true);
			conn.setDoInput(true);
			// 获取URLConnection对象对应的输出流
			out = new PrintWriter(conn.getOutputStream());
			// 发送请求参数
			out.print(param);
			// flush输出流的缓冲
			out.flush();
			// 定义BufferedReader输入流来读取URL的响应
			in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
			String line;
			while ((line = in.readLine()) != null) {
				result += line;
			}
		} catch (Exception e) {
			System.out.println("发送 POST 请求出现异常！" + e);
			e.printStackTrace();
		}
		// 使用finally块来关闭输出流、输入流
		finally {
			try {
				if (out != null) {
					out.close();
				}
				if (in != null) {
					in.close();
				}
			} catch (IOException ex) {
				ex.printStackTrace();
			}
		}
		return result;
	}

 /**
     * 发送post请求
     *
     * @param url        路径
     * @param json       参数(json类型)
     * @return
     * @throws ParseException
     * @throws IOException
     */
    public static String sendPostJson(String url, String json) {
        String body = "";
        try {
        	// 创建httpclient对象
            CloseableHttpClient client = HttpClients.createDefault();
            // 创建post方式请求对象
            HttpPost httpPost = new HttpPost(url);
            log.info("请求的参数是{}",url + "?" + json);
            // 装填参数
            StringEntity s = new StringEntity(json, "utf-8");

            s.setContentEncoding("UTF-8");

            // 设置header信息
            httpPost.setHeader("Content-type", "application/json");
            // 设置参数到请求对象中
            httpPost.setEntity(s);
            // 执行请求操作，并拿到结果（同步阻塞）
            CloseableHttpResponse response = client.execute(httpPost);
            // 获取结果实体
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                // 按指定编码转换结果实体为String类型
                body = EntityUtils.toString(entity, "UTF-8");
            }
            EntityUtils.consume(entity);
            // 释放链接
            response.close();
		} catch (ConnectException e) {
            log.error("调用HttpUtils.sendPostJson ConnectException, url=" + url + ",param=" + json, e);
        } catch(IOException e) {
        	log.error("调用HttpUtils.sendPostJson IOException, url=" + url + ",param=" + json, e);
		} catch(Exception e) {
			log.error("调用HttpUtils.sendPostJson Exception, url=" + url + ",param=" + json, e);
		}

        log.info("sendPost返回结果 - {}", body);
        return body;
    }