HttpUtil工具类

最近在工作中需要在后台调用远程接口，于是自己封装了一个HttpClient工具类，简单轻松的实现get，post请求，分享给大家。

public class HttpUtil {

    /**
     * post请求传输map数据
     *
     * @param url url地址
     * @param map map数据
     * @return
     * @throws ClientProtocolException
     * @throws IOException
     */
    public static String sendPostDataByMap(String url, Map<String, Object> map) throws ClientProtocolException, IOException {
        String result = "";
        // 创建httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        // 创建post方式请求对象
        HttpPost httpPost = new HttpPost(url);
        // 装填参数
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
        if (map != null) {
            for (Map.Entry<String, Object> entry : map.entrySet()) {
                nameValuePairs.add(new BasicNameValuePair(entry.getKey(), String.valueOf(entry.getValue())));
            }
        }

        // 设置参数到请求对象中
        httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "utf-8"));

        // 设置header信息
        // 指定报文头【Content-type】、【User-Agent】
        httpPost.setHeader("Content-type", "application/x-www-form-urlencoded");
        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 = httpClient.execute(httpPost);
        // 获取结果实体
        // 判断网络连接状态码是否正常(0--200都是正常)
        if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
            result = EntityUtils.toString(response.getEntity(), "utf-8");
        }
        // 释放连接
        response.close();

        return result;
    }

    /**
     * post请求传输json数据
     *
     * @param url  url地址
     * @param json json数据
     * @return
     * @throws ClientProtocolException
     * @throws IOException
     */
    public static String  sendPostDataByJson(String url, String json) throws ClientProtocolException, IOException {
        String result = "";

        // 创建httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        // 创建post方式请求对象
        HttpPost httpPost = new HttpPost(url);
        // 设置参数到请求对象中
        StringEntity stringEntity = new StringEntity(json, ContentType.APPLICATION_JSON);
        stringEntity.setContentEncoding("utf-8");
        httpPost.setEntity(stringEntity);

        // 执行请求操作，并拿到结果（同步阻塞）
        CloseableHttpResponse response = httpClient.execute(httpPost);

        // 获取结果实体
        // 判断网络连接状态码是否正常(0--200都是正常)
        if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
            result = EntityUtils.toString(response.getEntity(), "utf-8");
        }
        // 释放链接
        response.close();

        return result;
    }

    /**
     * get请求传输数据
     *
     * @param url
     * @return
     * @throws ClientProtocolException
     * @throws IOException
     */
    public static String sendGetData(String url) throws ClientProtocolException, IOException {
        String result = "";

        // 创建httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();

        // 创建get方式请求对象
        HttpGet httpGet = new HttpGet(url);
        httpGet.addHeader("Content-type", "application/json");
        // 通过请求对象获取响应对象
        CloseableHttpResponse response = httpClient.execute(httpGet);

        // 获取结果实体
        // 判断网络连接状态码是否正常(0--200都是正常)
        if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
            result = EntityUtils.toString(response.getEntity(), "utf-8");
        }
        // 释放链接
        response.close();

        return result;
    }

}