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：

Android通过HttpURLConnection与HttpClient联网代理网关设置

android网络类型 wap代理设置

http://wenku.baidu.com/view/13e6a73331126edb6f1a10ea.html