• android post 方式 访问网络 实例

因为Android4.0之后对使用网络有特殊要求，已经无法再在主线程中访问网络了，必须使用多线程访问的模式

该实例需要在android配置文件中添加 网络访问权限

<uses-permission android:name="android.permission.INTERNET"/>

android版本 最低API

<uses-sdk  android:minSdkVersion="9"  android:targetSdkVersion="17" />

package com.app.urltest;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.os.StrictMode;

import android.view.Menu;

import android.widget.TextView;

public class MainActivity extends Activity {

	TextView textView;

	// 网络地址

	String urlPath = "http://webservice.webxml.com.cn/WebServices/TrainTimeWebService.asmx"

			+ "/getStationAndTimeByStationName";

	// 请求参数

	String requestStr = "StartStation=北京&ArriveStation=上海&UserID=";

	/*

	 * 网络连接 讲uripath 转换成URL对象 连接请求 需用 URL对象的openConnection

	 * 方法得到一个连接对象httpUrlConnection 设置请求参数: 超时 请求方式 读写 内容类型 长度 ... 发送请求参数:得到输出流

	 * 吧请求参数写到输出流 服务器响应: 从响应 (输入)流中得到 数据 需用ANdroidManifest中添加 访问网络权限

	 */

	public String connectNework() {

		try {

			// 创建URL

			URL url = new URL(urlPath);

			// 获得连接

			HttpURLConnection connection = (HttpURLConnection) url.openConnection();

			// 设置请求参数

			connection.setReadTimeout(3000);// 超时

			connection.setRequestMethod("POST");// 请求方式

			connection.setDoInput(true);// 可读写

			connection.setDoOutput(true);

			connection.setRequestProperty("Content-Type",

					"application/x-www-form-urlencoded");// 设置请求 参数类型

			byte[] sendData = requestStr.getBytes("UTF-8");// 将请求字符串转成UTF-8格式的字节数组

			connection.setRequestProperty("Content-Length", sendData.length

					+ "");// 请求参数的长度

			OutputStream outputStream = connection.getOutputStream();// 得到输出流对象

			outputStream.write(sendData);// 发送写入数据

			/*//获得 服务器响应代码

			int code = connection.getResponseCode();

			if(code==20){

				//获取数据

			}

*/

			// 响应

			InputStream inputStream = connection.getInputStream();

			InputStreamReader inputStreamReader = new InputStreamReader(

					inputStream);

			BufferedReader bReader = new BufferedReader(inputStreamReader);

			String str = "";

			String temp = "";

			while ((temp = bReader.readLine()) != null) {

				str = str + temp + "\n";

			}

			return str;// 返回响应数据

		} catch (MalformedURLException e) {

			e.printStackTrace();

		} catch (IOException e) {

			e.printStackTrace();

		}

		return null;

	}

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()

		.detectAll()

		.penaltyLog()

		.penaltyDialog() ////打印logcat，当然也可以定位到dropbox，通过文件保存相应的log

		.build());

		StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder().detectAll()

				.penaltyLog()

				.build()); 

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		textView = (TextView) findViewById(R.id.textView1);

		new Thread(runnable).start();  

	}

	String text;

	//使用Handler 对象更新主UI

	Handler handler = new Handler(){

		public void handleMessage(android.os.Message msg) {

			/*方式二: 使用Bundle接收数据

			 * Bundle data = new Bundle()

			 * String text =data.getString("s",s);

			 *

			 */

			//显示到控件

			textView.setText(text);

		};

	};

	Runnable runnable  = new Runnable() { 

		@Override

		public void run() {

			//连接网络请求

			text = connectNework();

			Message msg = new Message();

			/* 使用Bundle对象 传送数据

			 * Bundle data = new Bundle();

			 * data.putString("s",s);

			 * msg.setData(data);

			 *

			 */

			handler.sendMessage(msg);

		}

	};

	@Override

	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.

		getMenuInflater().inflate(R.menu.main, menu);

		return true;

	}

}

• Apche接口实现 访问网络

package com.app.apachehttpclient;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import java.util.ArrayList;

import java.util.List;

import org.apache.http.HttpResponse;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.HttpClient;

import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.message.BasicNameValuePair;

import org.apache.http.util.EntityUtils;

import android.app.Activity;

import android.os.Bundle;

import android.os.StrictMode;

import android.widget.TextView;

public class MainActivity extends Activity {

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()

				.detectAll().penaltyLog().penaltyDialog() // //打印logcat，当然也可以定位到dropbox，通过文件保存相应的log

				.build());

		StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder().detectAll()

				.penaltyLog().build());

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		String url_service = "http://webservice.webxml.com.cn/WebServices/TrainTimeWebService.asmx"

				+ "/getStationAndTimeByStationName";

		// 创建一个请求

		HttpPost httpPost = new HttpPost(url_service);

		List params = new ArrayList();

		// 设置参数

		params.add(new BasicNameValuePair("StartStation", "北京"));// 始发站

		params.add(new BasicNameValuePair("ArriveStation", "上海"));// 到达站

		params.add(new BasicNameValuePair("UserID", ""));// 用户ID

		try {

			// 设置编码

			httpPost.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));

			// 发送请求 并获得反馈

			HttpClient httpClient = new DefaultHttpClient();

			HttpResponse httpResponse = httpClient.execute(httpPost);

			// 解析返回的数据

			if (httpResponse.getStatusLine().getStatusCode() != 404) {//判断服务器状态

				String result = EntityUtils.toString(httpResponse.getEntity());

				System.out.println(result);

				// 显示到控件

				TextView textView1 = (TextView) findViewById(R.id.textView1);

				textView1.setText(result);

			}

		} catch (UnsupportedEncodingException e) {

			e.printStackTrace();

		} catch (ClientProtocolException e) {

			e.printStackTrace();

		} catch (IOException e) {

			e.printStackTrace();

		}

	}

}