Android开发实现HttpClient工具类
在Android开发中我们经常会用到网络连接功能与服务器进行数据的交互，为此Android的SDK提供了Apache的HttpClient来方便我们使用各种Http服务。你可以把HttpClient想象成一个浏览器，通过它的API我们可以很方便的发出GET，POST请求（当然它的功能远不止这些）。
比如你只需以下几行代码就能发出一个简单的GET请求并打印响应结果：
public class CustomerHttpClient { private static final String CHARSET = HTTP.UTF_8; private static HttpClient customerHttpClient; private CustomerHttpClient() { } public static synchronized HttpClient getHttpClient() { if (null == customerHttpClient) { HttpParams params = new BasicHttpParams(); // 设置一些基本参数 HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1); HttpProtocolParams.setContentCharset(params, CHARSET); HttpProtocolParams.setUseExpectContinue(params, true); HttpProtocolParams .setUserAgent( params, "Mozilla/5.0(Linux;U;Android 2.2.1;en-us;Nexus One Build.FRG83) " + "AppleWebKit/553.1(KHTML,like Gecko) Version/4.0 Mobile Safari/533.1"); // 超时设置 /* 从连接池中取连接的超时时间 */ ConnManagerParams.setTimeout(params, 1000); /* 连接超时 */ HttpConnectionParams.setConnectionTimeout(params, 2000); /* 请求超时 */ HttpConnectionParams.setSoTimeout(params, 4000); // 设置我们的HttpClient支持HTTP和HTTPS两种模式 SchemeRegistry schReg = new SchemeRegistry(); schReg.register(new Scheme("http", PlainSocketFactory .getSocketFactory(), 80)); schReg.register(new Scheme("https", SSLSocketFactory .getSocketFactory(), 443)); // 使用线程安全的连接管理来创建HttpClient ClientConnectionManager conMgr = new ThreadSafeClientConnManager( params, schReg); customerHttpClient = new DefaultHttpClient(conMgr, params); } return customerHttpClient; } }