Android 程序访问WEB服务 HTTP 接口使用
本文基于Android 2.3平台讲解，尤其注意的是Httpclient方法使用的Apache 接口和方法在2.3平台以后有变动。
1、HttpClient方式
private static ClientConnectionManager sClientConnectionManager = null;
public final ConnPerRoute sConnPerRoute = new ConnPerRoute() {
public int getMaxForRoute(HttpRoute route) {
return 80;
}
};
public synchronized ClientConnectionManager getClientConnectionManager() {
if (sClientConnectionManager == null) {
// Create a registry for our three schemes; http and https will
// use
// built-in factories
SchemeRegistry registry = new SchemeRegistry();
registry.register(new Scheme("http", PlainSocketFactory
.getSocketFactory(), 80));
// And create a ccm with our registry
HttpParams params = new BasicHttpParams();
params
.setIntParameter(ConnManagerPNames.MAX_TOTAL_CONNECTIONS,
320);
params.setParameter(ConnManagerPNames.MAX_CONNECTIONS_PER_ROUTE,
sConnPerRoute);
sClientConnectionManager = new ThreadSafeClientConnManager(params,
registry);
}
// Null is a valid return result if we get an exception
return sClientConnectionManager;
}
private HttpClient getHttpClient(int timeout) {
HttpParams params = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(params, 20 * 1000);
HttpConnectionParams.setSoTimeout(params, timeout);
HttpConnectionParams.setSocketBufferSize(params, 8192);
HttpClient client = new DefaultHttpClient(getClientConnectionManager(),
params);
return client;
}
HttpClient client = getHttpClient(20 * 1000);
HttpGet method = new HttpGet("http://**.com/xx");
method.setHeader("Connection", "keep-alive");
HttpResponse res = client.execute(method);
int code = res.getStatusLine().getStatusCode();
if (code == HttpStatus.SC_OK) {
HttpEntity e = res.getEntity();
......//BODY处理
}
2、HttpURLConnection
String url = "http://**.com/xx";
URL myFileURL = null;
HttpURLConnection conn = null;
Proxy proxy = null;
boolean needProxy = false;
private boolean getNetType() {
ConnectivityManager conn = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
if (conn == null) {
Log.v("tag", "@==============data is disconnecting=");
return false;
}
NetworkInfo info = conn.getActiveNetworkInfo();
if (info == null)
return false;
String type = info.getTypeName();// MOBILE（GPRS）;WIFI
Log.v("tag", "@==============NetworkType=" + type);
if (type.equalsIgnoreCase("WIFI")) {
return true;
} else if (type.equalsIgnoreCase("MOBILE")) {
String apn = info.getExtraInfo();
Log.v("tag", "@============APN=" + apn);
if (apn != null && apn.equalsIgnoreCase("cmwap")) {
return false;
} else {
return true;
}
}
return false;
}
// 当我们使用的是中国移动的手机网络时，下面方法可以直接获取得到10.0.0.172，80端口
if (!getNetType()) {
needProxy = true;
String host = android.net.Proxy.getDefaultHost();
// 通过andorid.net.Proxy可以获取默认的代理地址
int port = android.net.Proxy.getDefaultPort();
// 通过andorid.net.Proxy可以获取默认的代理端口
SocketAddress sa = new InetSocketAddress(host, port);
// 定义代理，此处的Proxy是源自java.net
proxy = new Proxy(java.net.Proxy.Type.HTTP, sa);
}
try {
myFileURL = new URL(url); // 获得连接
if (needProxy) {
conn = (HttpURLConnection) myFileURL.openConnection(proxy);
needProxy = false;
} else {
conn = (HttpURLConnection) myFileURL.openConnection(); // 设置超时时间为6000毫秒，conn.setConnectionTiem(0);表示没有时间限制
}
conn.setConnectTimeout(30000); // 连接设置获得数据流
// conn.setReadTimeout(5000);
// conn.setDoInput(true); // 不使用缓存//这句好像不能用，不连CMNET都无法访问了
conn.setUseCaches(false); // 这句可有可无，没有影响
conn.setRequestMethod("GET");
conn.setRequestProperty("Connection", "close");
// conn.connect();
// 得到数据流
InputStream is = conn.getInputStream();
......//BODY处理
}
中国移动对CMWAP作了一定的限制，主要表现在CMWAP接入时只能访问GPRS网络内的IP（10.*.*.*），而无法通过路由访问Internet。（少数地区的移动网络可能不存在这一限制。）我们用CMWAP浏览Internet上的网页就是通过WAP网关协议或它提供的HTTP代理服务实现的.所以在使用HttpURLConnection的时候要先进行接入模式判断，如果是CMWAP模式则要进行代理设置，而HttpClient不需要我们进行代理设置，我觉得应该是apache JAR包内帮我们进行这一判断。
参考：
