package com.zhangbz.submitdata.Utils;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLConnection;import java.net.URLEncoder;import android.util.Log;public class NetUtils {		private static final String TAG = "NetUtils";	/**	 * 使用post的方式登录	 * @param userName	 * @param password	 * @return	 */	public static String loginOfPost(String userName, String password){		HttpURLConnection conn = null;		try {			URL url = new URL("http://10.0.2.2:8080/serverzhangbz/servlet/LoginServlet?");						conn = (HttpURLConnection) url.openConnection();						conn.setRequestMethod("POST");			conn.setReadTimeout(10000);  //连接的超时时间			conn.setReadTimeout(5000);   //读数据的超时时间			conn.setDoOutput(true);//必须设置此方法，允许输出			//conn.setRequestProperty("content-Length", 234);  //设置请求头消息，可以设置多个						//post请求的参数			String data = "username=" + userName + "&password=" + password;						//获得一个输出流，用于向服务器写数据，默认情况下，系统不予许向服务器输出内容			OutputStream out = conn.getOutputStream();			out.write(data.getBytes());			out.flush();			out.close();						int responseCode = conn.getResponseCode();			if(responseCode == 200) {				InputStream is = conn.getInputStream();				String state = getSringFromInputStream(is);				Log.i(TAG, state);				return state;			} else {				Log.i(TAG, "访问失败：" + responseCode);			}		} catch (Exception e) {			// TODO Auto-generated catch block			e.printStackTrace();		}finally {			if(conn != null) {				conn.disconnect(); //关闭连接			}		}				return null;	}	/**	 * 使用get的方式登录	 * @param userName	 * @param password	 * @return	 */	public static String logOfPost(String userName, String password) {		HttpURLConnection conn = null; //局部变量在使用时必须进行初始化		try {			String data = "username=" + URLEncoder.encode(userName) + "&password=" + URLEncoder.encode(password);			URL url = new URL("http://10.0.2.2:8080/serverzhangbz/servlet/LoginServlet?" + data);			conn = (HttpURLConnection) url.openConnection();						conn.setRequestMethod("GET");//get或者post必须得全大写			conn.setReadTimeout(10000);//连接的超时时间			conn.setReadTimeout(5000);//读数据的超时连接						int responseCode = conn.getResponseCode();			if(responseCode == 200) {				InputStream is = conn.getInputStream();				String state = getSringFromInputStream(is);				Log.i(TAG, state);				return state;         		} else {				Log.i(TAG, "访问失败：" + responseCode);			}		} catch (Exception e) {			e.printStackTrace();		} finally {			if(conn != null) {				conn.disconnect(); //关闭连接			}		}				return null;			}	/**	 * 根据流返回一个字符串信息	 * @param is	 * @return	 * @throws IOException	 */	private static String getSringFromInputStream(InputStream is) throws IOException{				ByteArrayOutputStream baos = new ByteArrayOutputStream();		byte[] buffer = new byte[1024];		int len = -1;				while((len = is.read(buffer)) != -1){			baos.write(buffer, 0, len);		}		is.close();		String html = baos.toString(); //把流中的数据转换成字符串，采用的编码是：utf-8				//String html = new String(baos.toByteArray(), "GBK");				baos.close();		return html;	}}