Android开发之Http通信HttpClient接口
转自：http://blog.csdn.net/redoffice/article/details/7555632
HttpClient接口
Apache提供了HttpClient接口，其对java.net中的类做了封装和抽象。更适合我们在Android上开发联网应用。要使用HttpClient还需要了解一些类：
1. ClientConnectionManager接口
此接口是客户端连接浏览器的接口，提供如下的抽象方法：
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Public Methods |
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abstract void |
closeExpiredConnections() //关闭所有无效超时的连接 Closes all expired connections in the pool. |
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abstract void |
closeIdleConnections(long idletime, TimeUnit tunit) //关闭空闲的连接 Closes idle connections in the pool. |
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abstract SchemeRegistry |
getSchemeRegistry() //得到一个SchemeRegistry Obtains the scheme registry used by this manager. |
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abstract void |
releaseConnection(ManagedClientConnection conn, long validDuration, TimeUnit timeUnit) Releases a connection for use by others.//释放一个连接 |
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abstract ClientConnectionRequest |
requestConnection(HttpRoute route, Object state)// 请求一个新的连接 Returns a new ClientConnectionRequest, from which a ManagedClientConnection can be obtained or the request can be aborted. |
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abstract void |
shutdown() //关闭管理器并释放资源 Shuts down this connection manager and releases allocated resources. |
2. DefaultHttpClient
DefaultHttpClient是默认的一个Http客户端，可以使用它创建一个Http连接。
This class replaces HttpClient in HttpClient 3。
创建一个DefaultHttpColient的代码如下：
HttpClient httpclient = new DefaultHttpClient();
3. HttpResponse
HttpResponse是一个Http连接响应，当执行一个Http连接后，就会返回一个HttpResponse，可以通过HttpResponse获得一些响应信息。例如，请求一个HTTP连接并获得该请求是否成功的代码：
HttpClient httpclient = new DefaultHttpClient();
HttpResponse httpResponse = httpclient.execute(httpRequest);
if(httpResponse.getStatusLine().getStatusCode()==HttpStatus.sc_OK){
//连接成功
}
后继将附上GET以及POST方式的代码。代码基本上跟HttpURLConnection的代码类似。
