公共代码参考（httpclient）

public class HttpClientUtils {

    private static final String CHARSET = "UTF-8";

    /*
     * http get请求
     * 
     * @param url
     * 
     * @param params
     * 
     * @return
     */
    public static String httpGet(String url, Map<String, String> params) {

        if (true == StringUtils.isEmpty(url)) {
            return null;
        }

        List<NameValuePair> pl = getParamList(params);

        // 转换参数
        if (null != pl) {
            String urlparams = URLEncodedUtils.format(pl, CHARSET);
            url = url + "?" + urlparams;
        }

        DefaultHttpClient httpclient = new DefaultHttpClient();
        HttpGet httpget = new HttpGet(url);

        try {
            HttpResponse response = httpclient.execute(httpget);
            HttpEntity entity = response.getEntity();
            if (null != entity) {
                return EntityUtils.toString(entity);
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return null;
    }

    
    /*
     * http post请求
     * 
     * @param url
     * 
     * @param params
     * 
     * @return
     */
    public static String httpPost(String url, Map<String, String> params) {
        if (true == StringUtils.isEmpty(url)) {
            return null;
        }
        
        DefaultHttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(url);
        List<NameValuePair> pl = getParamList(params);

        // 转换参数
        if (null != pl) {
            HttpEntity entity;
            try {
                entity = new UrlEncodedFormEntity(pl);
                httppost.setEntity(entity);
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }        
        }
        
        try {
            HttpResponse response = httpclient.execute(httppost);
            HttpEntity entity = response.getEntity();
            if (null != entity) {
                return EntityUtils.toString(entity);
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return null;
    }

    /*
     * 创建标准的NameValuePair格式参数
     * 
     * @param params
     * 
     * @return
     */
    public static List<NameValuePair> getParamList(Map<String, String> params) {
        if (null == params || 0 == params.size()) {
            return null;
        }

        List<NameValuePair> list = new ArrayList<NameValuePair>();
        for (Map.Entry<String, String> param : params.entrySet()) {
            list.add(new BasicNameValuePair(param.getKey(), param.getValue()));
        }
        return list;
    }
}

public class HttpClientUtilsTest extends TestCase {
    
    private static final String LOG_TAG = "HttpClientUtilsTest";
    
    public void testHttpGet1(){
        String url = "http://192.168.1.101:3000/gettest";
        String result = HttpClientUtils.httpGet(url, null);
        System.out.println(result);
        Log.i(LOG_TAG, result);
    }
    
    public void testHttpGet2(){
        String url = "http://192.168.1.101:3000/gettest";
        Map<String,String> map = new HashMap<String,String>();
        map.put("username", "fredric");
        map.put("password", "fredrictoo");
        
        String result = HttpClientUtils.httpGet(url, map);
        System.out.println(result);
        Log.i(LOG_TAG, result);
    }
    
    public void testHttpPost1(){
        String url = "http://192.168.1.101:3000/posttest";
        Map<String,String> map = new HashMap<String,String>();
        map.put("username", "sinny");
        map.put("password", "sinnytoo");
        String result = HttpClientUtils.httpPost(url, map);
        System.out.println(result);
        Log.i(LOG_TAG, result);
    }    
}