httpclient

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public String doGet(String url, Map params) {

 /* 建立HTTPGet对象 */

 String paramStr = "";

 Iterator iter = params.entrySet().iterator();
 while (iter.hasNext()) {
 Map.Entry entry = (Map.Entry) iter.next();
 Object key = entry.getKey();
 Object val = entry.getValue();
 paramStr += paramStr = "&" + key + "=" + val;
 }

 if (!paramStr.equals("")) {
 paramStr = paramStr.replaceFirst("&", "?");
 url += paramStr;
 }
 HttpGet httpRequest = new HttpGet(url);

 String strResult = "doGetError";

 try {

 /* 发送请求并等待响应 */
 HttpResponse httpResponse = httpClient.execute(httpRequest);
 /* 若状态码为200 ok */
 if (httpResponse.getStatusLine().getStatusCode() == 200) {
 /* 读返回数据 */
 strResult = EntityUtils.toString(httpResponse.getEntity());

 } else {
 strResult = "Error Response: "
 + httpResponse.getStatusLine().toString();
 }
 } catch (ClientProtocolException e) {
 strResult = e.getMessage().toString();
 e.printStackTrace();
 } catch (IOException e) {
 strResult = e.getMessage().toString();
 e.printStackTrace();
 } catch (Exception e) {
 strResult = e.getMessage().toString();
 e.printStackTrace();
 }

 Log.v("strResult", strResult);

 return strResult;
 }

public String doPost(String url, List params) {

 /* 建立HTTPPost对象 */
 HttpPost httpRequest = new HttpPost(url);

 String strResult = "doPostError";

 try {
 /* 添加请求参数到请求对象 */
 httpRequest.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
 /* 发送请求并等待响应 */
 HttpResponse httpResponse = httpClient.execute(httpRequest);
 /* 若状态码为200 ok */
 if (httpResponse.getStatusLine().getStatusCode() == 200) {
 /* 读返回数据 */
 strResult = EntityUtils.toString(httpResponse.getEntity());

 } else {
 strResult = "Error Response: "
 + httpResponse.getStatusLine().toString();
 }
 } catch (ClientProtocolException e) {
 strResult = e.getMessage().toString();
 e.printStackTrace();
 } catch (IOException e) {
 strResult = e.getMessage().toString();
 e.printStackTrace();
 } catch (Exception e) {
 strResult = e.getMessage().toString();
 e.printStackTrace();
 }

 Log.v("strResult", strResult);

 return strResult;
 }

public HttpClient getHttpClient() {

 // 创建 HttpParams 以用来设置 HTTP 参数（这一部分不是必需的）

 this.httpParams = new BasicHttpParams();

 // 设置连接超时和 Socket 超时，以及 Socket 缓存大小

 HttpConnectionParams.setConnectionTimeout(httpParams, 20 * 1000);

 HttpConnectionParams.setSoTimeout(httpParams, 20 * 1000);

 HttpConnectionParams.setSocketBufferSize(httpParams, 8192);

 // 设置重定向，缺省为 true

 HttpClientParams.setRedirecting(httpParams, true);

 // 设置 user agent

 String userAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2) Gecko/20100115 Firefox/3.6";
 HttpProtocolParams.setUserAgent(httpParams, userAgent);

 // 创建一个 HttpClient 实例

 // 注意 HttpClient httpClient = new HttpClient(); 是Commons HttpClient

 // 中的用法，在 Android 1.5 中我们需要使用 Apache 的缺省实现 DefaultHttpClient

 httpClient = new DefaultHttpClient(httpParams);

 return httpClient;
 }