Android中HttpURLConnection与HttpClient的使用与封装

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

import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL; // 以下代码实现了以GET方式发起HTTP请求// 连接网络是耗时操作，一般新建线程进行 private void connectWithHttpURLConnection() {  new Thread( new Runnable() {    @Override    public void run() {      HttpURLConnection connection = null;      try {        // 调用URL对象的openConnection方法获取HttpURLConnection的实例        URL url = new URL("//www.VeVB.COm");        connection = (HttpURLConnection) url.openConnection();        // 设置请求方式，GET或POST        connection.setRequestMethod("GET");        // 设置连接超时、读取超时的时间，单位为毫秒（ms）        connection.setConnectTimeout(8000);        connection.setReadTimeout(8000);        // getInputStream方法获取服务器返回的输入流        InputStream in = connection.getInputStream();        // 使用BufferedReader对象读取返回的数据流        // 按行读取，存储在StringBuider对象response中        BufferedReader reader = new BufferedReader(new InputStreamReader(in));        StringBuilder response = new StringBuilder();        String line;        while ((line = reader.readLine()) != null) {          response.append(line);        }        //..........        // 此处省略处理数据的代码        // 若需要更新UI，需将数据传回主线程，具体可搜索android多线程编程      } catch (Exception e){        e.printStackTrace();      } finally {        if (connection != null){          // 结束后，关闭连接          connection.disconnect();        }      }    }  }).start();}

import java.io.DataOutputStream; //将对应部分改为connection.setRequestMethod("POST");DataOutputStream data = new DataOutputStream(connection.getOutputStream());data.writeBytes("stu_no=12345&stu_name=Tom");

import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.HttpResponse;import org.apache.http.HttpEntity;import org.apache.http.HttpStatus; // 创建DefaultHttpClient实例HttpClient httpClient = new DefaultHttpClient();   //传入网址，然后执行HttpGet httpGet = new HttpGet("//www.VeVB.COm");HttpResponse httpResponse = httpClient.execute(httpGet); // 由状态码判断请求结果，// 常见状态码 200 请求成功，404 页面未找到// 关于HTTP的更多状态码直接GOOGLEif (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {      // 请求成功，使用HttpEntity获得返回数据  // 使用EntityUtils将返回数据转换为字符串  HttpEntity entity = httpResponse.getEntity();   String response = EntityUtils.toString(entity);  //如果是中文，指定编码   //==>String response = EntityUtils.toString(entity, "utf-8"); }

import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpPost;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.message.BasicNameValuePair; HttpClient httpClient = new DefaultHttpClient();HttpPost httpPost("//www.VeVB.COm"); // 使用NameValuePair（键值对）存放参数List<NameValuePair> data = new ArrayList<NameValuePair>();// 添加键值对data.add(new BasicNameValuePair("stu_no", 12345));data.add(new BasicNameValuePair("stu_name", "Tom"));// 使用setEntity方法传入编码后的参数httpPost.setEntity(new UrlEncodedFormEntity(data, "utf-8")); // 执行该POST请求HttpResponse httpResponse = httpClient.execute(httpPost);// .....省略处理httpResponse的代码，与GET方式一致

// JQuery的post方法$.post("//www.VeVB.COm",{    "stu_no":12345,    "stu_name":"Tom",  }).done(function(){    //...请求成功的代码  }).fail(function(){    //...请求失败的代码  }).always(function(){    //...总会执行的代码  })

// 定义HttpCallbackListener接口// 包含两个方法，成功和失败的回调函数定义public interface HttpCallbackListener {  void onFinish(String response);  void onError(Exception e);}

import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL; /* 创建一个新的类 HttpTool，将公共的操作抽象出来 * 为了避免调用sendRequest方法时需实例化，设置为静态方法 * 传入HttpCallbackListener对象为了方法回调 * 因为网络请求比较耗时，一般在子线程中进行， * 为了获得服务器返回的数据，需要使用java的回调机制 */ public class HttpTool {  public static void sendRequest(final String address,       final HttpCallbackListener listener) {    new Thread(new Runnable() {      @Override      public void run() {        HttpURLConnection connection = null;         try {          URL url = new URL(address);          connection = (HttpURLConnection) url.openConnection();          connection.setRequestMethod("GET");          connection.setConnectTimeout(8000);          connection.setReadTimeout(8000);          InputStream in = connection.getInputStream();          BufferedReader reader = new BufferedReader(new InputStreamReader(in));          StringBuilder response = new StringBuilder();   String line;          while ((line = reader.readLine()) != null) {            response.append(line);          }          if (listener != null) {            // 回调方法 onFinish()            listener.onFinish(response.toString());          }        } catch (Exception e) {          if (listener != null) {            // 回调方法 onError()            listener.onError(e);          }        } finally {          if (connection != null) {            connection.disconnect();          }        }      }    }).start();  }}

//使用该HttpTool发起GET请求String url = "//www.VeVB.COm";HttpTool.sendRequest(url,new HttpCallbackListener(){  @Override   public void onFinish(String response) {    // ...省略对返回结果的处理代码   }      @Override   public void onError(Exception e) {      // ...省略请求失败的处理代码  } });

/* 在GET方法实现的基础上增加一个参数params即可， * 将参数转换为字符串后传入 * 也可以传入键值对集合，再处理 */public static void sendRequest(final String address,  final String params, final HttpCallbackListener listener){    //...}