Android 请求

import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Arrays;

import com.google.gson.Gson;

/**
 * json字符串 和对象互换 工具类
 * 依赖Gson包
 * @see com.google.gson.Gson
 * @author devil
 *
 */
public class JsonUtil {

	/**
	 * 将json字符串转换成对象
	 *
	 * @param json
	 * @param type
	 * @return
	 */
	public static <T> T parse(String json, Class<T> type) {
		Gson gson = new Gson();
		T t = null ;
		try {
			 t = gson.fromJson(json, type) ;
		} catch (Exception e) {
			e.printStackTrace() ;
			return null ;
		}

		return t;
	}

	/**
	 * 将json转成数组
	 *
	 * @param json
	 * @param type
	 * @return
	 */
	public static <T> T[] parseArr(String json, Class<T[]> type) {
		return parse(json, type);
	}

	/**
	 * 将json转成集合
	 *
	 * @param json
	 * @param type
	 * @return
	 */
	public static <T> ArrayList<T> parseList(String json, Class<T[]> type) {
		return new ArrayList<T>(Arrays.asList(parse(json, type)));
	}

	/**
	 * 将对象转成json字符串
	 *
	 * @param o
	 * @return
	 */
	public static String format(Object o) {
		Gson gson = new Gson();
		return gson.toJson(o);
	}

	/**
	 * 将对象转成json字符串 并使用url编码
	 * @param o
	 * @return
	 */
	public static String formatURLString(Object o)
	{
		try
		{
			return URLEncoder.encode(format(o), "utf-8");
		}catch (Exception e) {
			return null;
		}
	}
}

HttpPost httpPost = new HttpPost(url);
		try {
			List<NameValuePair> params = new ArrayList<NameValuePair>();
			params.add(new BasicNameValuePair("username", username));

			httpPost.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8));
			DefaultHttpClient httpclient = new DefaultHttpClient();
			HttpConnectionParams.setConnectionTimeout(httpPost.getParams(), 10000);//设置连接超时
			HttpConnectionParams.setSoTimeout(httpPost.getParams(), 10000); //设置请求超时
			HttpResponse httpResponse =httpclient.execute(httpPost);
			if(httpResponse.getStatusLine().getStatusCode()==200){//成功响应了请求

public static String postHttpResponseText(String url, String post) {
		BufferedReader reader = null;
		HttpURLConnection conn = null;
		try {
			URL httpUrl = new URL(url);
			HttpURLConnection httpConn = (HttpURLConnection) httpUrl
					.openConnection(); // //设置连接属性
			httpConn.setDoOutput(true);// 使用URL 连接进行输出
			httpConn.setDoInput(true);// 使用 URL 连接进行输入
			httpConn.setUseCaches(false);// 忽略缓存
			httpConn.setRequestMethod("POST");// 设置URL请求方法
			String requestString = post; // 设置请求属性
			// 获得数据字节数据，请求数据流的编码，必须和下面服务器端处理请求流的编码一致
			byte[] requestStringBytes = requestString.getBytes("UTF-8");
			httpConn.setRequestProperty("Content-length", ""
					+ requestStringBytes.length);
			httpConn.setRequestProperty("Content-Type", "application/json");
			httpConn.setRequestProperty("Connection", "Keep-Alive");// 维持长连接
			httpConn.setRequestProperty("Charset", "UTF-8");
			// 建立输出流，并写入数据
			OutputStream outputStream = httpConn.getOutputStream();
			outputStream.write(requestStringBytes);
			outputStream.close(); // 获得响应状态
			int responseCode = httpConn.getResponseCode();
			if (HttpURLConnection.HTTP_OK == responseCode) {// 连接成功 //
															// 当正确响应时处理数据
				StringBuffer buffer = new StringBuffer();
				String readLine = null;
				// 处理响应流，必须与服务器响应流输出的编码一致
				reader = new BufferedReader(new InputStreamReader(
						httpConn.getInputStream(), "UTF-8"));
				while ((readLine = reader.readLine()) != null) {
					//buffer.append(readLine).append("\n");
					buffer.append(readLine);
				}
				reader.close();
				return buffer.toString();
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (reader != null) {
				try {
					reader.close();
				} catch (IOException e1) {
				}
			}
			if (conn != null) {
				conn.disconnect();
			}
		}
		return null;

	}