Android 万能Get请求Json方法

package com.example.h3c.net;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ConnectException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.util.Log;

import com.example.pickride.util.ConstantsTable;

public class HttpConnection {
    private final int TIMEOUT = 3000;// 设定超时时间

    /**
     * 请求服务器响应
     * 
     * @param requestType
     *            请求类型 requestContent [类型，参数，类型，参数]
     */
    public String requestService(String requestType, String... requestContent) {
        String resultData = "";
        InputStreamReader in = null;
        HttpURLConnection urlConn = null;
        BufferedReader buffer = null;
        try {
            StringBuffer sBuffer = new StringBuffer();
            for (int n = 0; n < requestContent.length; n++) {
                if ((n + 1) % 2 == 0) {
                    sBuffer.append("=" + requestContent[n] + "&");
                } else {
                    sBuffer.append(requestContent[n]);
                }
            }
            URL url = new URL(ConstantsTable.URI + requestType + "?" + sBuffer);

            if (url != null) {
                urlConn = (HttpURLConnection) url.openConnection();
                urlConn.setConnectTimeout(TIMEOUT);// 设置超时时间

                try {
                    in = new InputStreamReader(urlConn.getInputStream());
                } catch (ConnectException e) {
                    Log.e(ConstantsTable.LOG_TAG, "服务器宕机了...");
                    return resultData;
                }
                buffer = new BufferedReader(in);
                String inputLine = null;

                while ((inputLine = buffer.readLine()) != null) {
                    resultData += inputLine + "\n";
                }
                urlConn.disconnect();
                if (ConstantsTable.DEBUG_FLAG) {
                    Log.d(ConstantsTable.LOG_TAG, resultData);
                }
            }
        } catch (MalformedURLException e) {
            Log.e(ConstantsTable.LOG_TAG, "域名无法解析");
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (in != null) {
                    in.close();
                }
                if (buffer != null) {
                    buffer.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return resultData;
    }
}