java实现HTTP协议中GET和POST方法

public static String httpGet(String url,Map headerMap) {
    String result = null;
    HttpClient httpClient = new DefaultHttpClient();
    try {

        HttpGet httpGet = new HttpGet(url);
        if (headerMap != null) {
            for (String key : headerMap.keySet()) {
                httpGet.addHeader(key, headerMap.get(key).toString());
            }
        }
        HttpResponse httpResponse = httpClient.execute(httpGet);
        HttpEntity httpEntity = httpResponse.getEntity();
        result = EntityUtils.toString(httpEntity, "UTF-8");
        EntityUtils.consume(httpEntity);
    } catch (ClientProtocolException e) {
        log.error(e.getMessage());
    } catch (IOException e) {
        log.error(e.getMessage());
    } finally {
        httpClient.getConnectionManager().shutdown();
    }
    return result;
}


public static String httpPost(String url, String data,Map headerMap) {

    String result = null;
    HttpClient httpClient = new DefaultHttpClient();

    try {
        HttpPost httpPost = new HttpPost(url);
        if (headerMap != null) {
            for (String key : headerMap.keySet()) {
                httpPost.addHeader(key, headerMap.get(key).toString());
            }
        }
        httpPost.setEntity(new StringEntity(data, "UTF-8"));
        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        result = EntityUtils.toString(httpEntity);
        EntityUtils.consume(httpEntity);
    } catch (ClientProtocolException e) {
        log.error(e.getMessage());
    } catch (IOException e) {
        log.error(e.getMessage());
    } finally {
        httpClient.getConnectionManager().shutdown();
    }
    return result;
}