发送http请求

//统一编码格式'UTF-8'
    private static String ENCODING = "UTF-8";

    public static String GET(String url, Map<String, String> paramsMap) {
        try {
            HttpClient client = new DefaultHttpClient();
            //发送get请求
            HttpGet request = new HttpGet(url + StringUtils.convertParam(paramsMap ,ENCODING));
            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());
                return strResult;
            }
        }
        catch (IOException e) {
            e.printStackTrace();
        }

        return null;
    }


    public static String POST(String url, Map<String, String> paramsMap) {
        CloseableHttpClient client = HttpClients.createDefault();
        String responseText = "";
        CloseableHttpResponse response = null;
        try {
            HttpPost method = new HttpPost(url);
            if (paramsMap != null) {
                List<NameValuePair> paramList = new ArrayList<NameValuePair>();
                for (Map.Entry<String, String> param : paramsMap.entrySet()) {
                    NameValuePair pair = new BasicNameValuePair(param.getKey(), param.getValue());
                    paramList.add(pair);
                }
                method.setEntity(new UrlEncodedFormEntity(paramList, ENCODING));
            }
            response = client.execute(method);
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                responseText = EntityUtils.toString(entity);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                response.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return responseText;
    }

    public static String postXml(String url, String param)  throws Exception {
        HttpPost post = null;
        try {
            HttpClient httpClient = new DefaultHttpClient();

            // 设置超时时间
            httpClient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 2000);
            httpClient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 2000);

            post = new HttpPost(url);
            // 构造消息头
            post.setHeader("Content-type", "text/xml; charset=utf-8");
            post.setHeader("Connection", "Close");

            // 构建消息实体
            StringEntity entity = new StringEntity(param, "UTF-8");
            entity.setContentEncoding("UTF-8");
            // 发送Json格式的数据请求
            entity.setContentType("text/xml");
            post.setEntity(entity);

            HttpResponse response = httpClient.execute(post);

            // 检验返回码
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == HttpStatus.SC_OK) {
                return EntityUtils.toString(response.getEntity(),"utf-8");

            } else {
                //404...
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }

如果是其他请求将HTTPPost修改即可