My Android成长之路(三)——【HttpClient】

    
     HttpClient经常在开发的过程中会用到 所以这个是必须掌握的啦
     http请求主要常用的有get请求和post请求，如下：

//import 省略......

public class HttpUtil {
	/**
	 * HttpClient获取get请求的数据
	 * @param url 请求的地址
	 * @return 返回字符串
	 */
	public static String getDataByGet(String url) {
		StringBuilder sb = new StringBuilder();
		HttpClient client = new DefaultHttpClient();
		HttpParams httpParams = client.getParams();

		// 设置网络超时参数
		HttpConnectionParams.setConnectionTimeout(httpParams, 3000);
		HttpConnectionParams.setSoTimeout(httpParams, 5000);

		HttpGet request;
		try {
			// 发出request请求
			request = new HttpGet(url);

			// 返回response响应
			HttpResponse response = client.execute(request);
			
			// 判断请求是否成功
			if (response.getStatusLine().getStatusCode() == 200) {
				HttpEntity entity = response.getEntity();
				if (entity != null) {
                //这边也可以作和post类似的操作 这个只是另一种情况
					BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"),8192);
					String line = null;
					while ((line = reader.readLine()) != null) {
						sb.append(line + "\n");
					}
					reader.close();
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}

		return sb.toString();
	}

	/**
	 * HttpClient获取post请求<br/>
	 * 例子：<br/>
	 * List<NameValuePair > parms=new ArrayList<NameValuePair><br/>
	 * parms.add(new BasicNameValuePair(“str”,"I am Post String”));<br/>
	 * @param url 请求的地址
	 * @param parms 参数
	 * @return
	 */
	public static String getDataByPost(String url, List<NameValuePair> parms) {
		String out = null;
		HttpClient client = new DefaultHttpClient();
		HttpPost request;
		try {
			// 发出request请求
			request = new HttpPost(new URI(url));
			request.setEntity(new UrlEncodedFormEntity(parms, HTTP.UTF_8));

			// 返回response响应
			HttpResponse response = client.execute(request);

			// 判断请求是否成功
			if (response.getStatusLine().getStatusCode() == 200) {
				HttpEntity entity = response.getEntity();
				if (entity != null) {
					out = EntityUtils.toString(entity);
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return out;
	}
}