Android簡易網絡請求工具WebHttpHelper

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import android.text.TextUtils;
import android.util.Log;

public class WebHttpHelper {

private static WebHttpHelper util;

public static WebHttpHelper getInstance() {

    if (util == null) {
        util = new WebHttpHelper();
    }
    return util;

}

private WebHttpHelper() {
    super();
}

public InputStream getInputStream(String urlS, Map<String, String> param,
        boolean isGet) throws Exception {
    URL url = null;
    HttpURLConnection hc = null;
    StringBuffer request = new StringBuffer();

    try {

        String get = "GET";
        for (String key : param.keySet()) {

            request.append(key + "=" + param.get(key) + "&");
        }

        String newUrl = urlS;
        if (!TextUtils.isEmpty(request.toString())) {
            newUrl = urlS + "?" + request.toString();
        }

        Log.e("url", newUrl);
        if (!isGet) {
            get = "POST";
            url = new URL(urlS);

        } else {

            url = new URL(newUrl);

        }

        hc = (HttpURLConnection) url.openConnection();
        hc.setConnectTimeout(45000);
        // hc.setRequestProperty("Cookie", ConstUtil.COOKIEMESSAGE);

        hc.setRequestMethod(get);
        if (!isGet) {

            for (String key : param.keySet()) {

                hc.addRequestProperty(key, param.get(key));
            }
            hc.setDoOutput(true);
            hc.getOutputStream().flush();
            hc.getOutputStream().close();
        }

        hc.setInstanceFollowRedirects(false);

        hc.setDoInput(true);

    } catch (Exception e) {
        e.printStackTrace();
    }

    return hc.getInputStream();

}

public String getString(String urlS, Map<String, String> param,
        boolean isGet, String encoding) {
    if (param == null) {
        param = new HashMap<String, String>();
    }
    BufferedReader br = null;

    StringBuffer sb = new StringBuffer();

    try {
        br = new BufferedReader(new InputStreamReader(getInputStream(urlS,
                param, isGet), encoding));
        String temp = "";
        while ((temp = br.readLine()) != null) {
            sb.append(temp);
        }

    } catch (Exception e) {
        e.printStackTrace();
    }
    return sb.toString();
}

}</pre>