Android 网络操作常用的两个类

// HttpGet方式请求  
public static void requestByHttpGet() throws Exception {  
    String path = "https://reg.163.com/logins.jsp?id=helloworld&pwd=android";  
    // 新建HttpGet对象  
    HttpGet httpGet = new HttpGet(path);  
    // 获取HttpClient对象  
    HttpClient httpClient = new DefaultHttpClient();  
    // 获取HttpResponse实例  
    HttpResponse httpResp = httpClient.execute(httpGet);  
    // 判断是够请求成功  
    if (httpResp.getStatusLine().getStatusCode() == HTTP_200) {  
        // 获取返回的数据  
        String result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");  
        Log.i(TAG_HTTPGET, "HttpGet方式请求成功，返回数据如下：");  
        Log.i(TAG_HTTPGET, result);  
    } else {  
        Log.i(TAG_HTTPGET, "HttpGet方式请求失败");  
    }  
}

public String doGet()  
    {  
        String uriAPI = "http://XXXXX?str=I+am+get+String";  
        String result= "";  
//      HttpGet httpRequst = new HttpGet(URI uri);  
//      HttpGet httpRequst = new HttpGet(String uri);  
//      创建HttpGet或HttpPost对象，将要请求的URL通过构造方法传入HttpGet或HttpPost对象。  
        HttpGet httpRequst = new HttpGet(uriAPI);  
  
//      new DefaultHttpClient().execute(HttpUriRequst requst);  
        try {  
   //使用DefaultHttpClient类的execute方法发送HTTP GET请求，并返回HttpResponse对象。  
            HttpResponse httpResponse = new DefaultHttpClient().execute(httpRequst);//其中HttpGet是HttpUriRequst的子类  
            if(httpResponse.getStatusLine().getStatusCode() == 200)  
            {  
                HttpEntity httpEntity = httpResponse.getEntity();  
                result = EntityUtils.toString(httpEntity);//取出应答字符串  
            // 一般来说都要删除多余的字符   
                result.replaceAll("\r", "");//去掉返回结果中的"\r"字符，否则会在结果字符串后面显示一个小方格    
            }  
                   else   
                        httpRequst.abort();  
           } catch (ClientProtocolException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
            result = e.getMessage().toString();  
        } catch (IOException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
            result = e.getMessage().toString();  
        }  
        return result;  
    }

public String doPost()  
    {  
        String uriAPI = "http://XXXXXX";//Post方式没有参数在这里  
        String result = "";  
        HttpPost httpRequst = new HttpPost(uriAPI);//创建HttpPost对象  
          
        List <NameValuePair> params = new ArrayList<NameValuePair>();  
        params.add(new BasicNameValuePair("str", "I am Post String"));  
          
        try {  
            httpRequst.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8));  
            HttpResponse httpResponse = new DefaultHttpClient().execute(httpRequst);  
            if(httpResponse.getStatusLine().getStatusCode() == 200)  
            {  
                HttpEntity httpEntity = httpResponse.getEntity();  
                result = EntityUtils.toString(httpEntity);//取出应答字符串  
            }  
        } catch (UnsupportedEncodingException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
            result = e.getMessage().toString();  
        }  
        catch (ClientProtocolException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
            result = e.getMessage().toString();  
        }  
        catch (IOException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
            result = e.getMessage().toString();  
        }  
        return result;  
    }  

// HttpPost方式请求  
public static void requestByHttpPost() throws Exception {  
    String path = "https://reg.163.com/logins.jsp";  
    // 新建HttpPost对象  
    HttpPost httpPost = new HttpPost(path);  
    // Post参数  
    List<NameValuePair> params = new ArrayList<NameValuePair>();  
    params.add(new BasicNameValuePair("id", "helloworld"));  
    params.add(new BasicNameValuePair("pwd", "android"));  
    // 设置字符集  
    HttpEntity entity = new UrlEncodedFormEntity(params, HTTP.UTF_8);  
    // 设置参数实体  
    httpPost.setEntity(entity);  
    // 获取HttpClient对象  
    HttpClient httpClient = new DefaultHttpClient();  
    // 获取HttpResponse实例  
    HttpResponse httpResp = httpClient.execute(httpPost);  
    // 判断是够请求成功  
    if (httpResp.getStatusLine().getStatusCode() == HTTP_200) {  
        // 获取返回的数据  
        String result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");  
        Log.i(TAG_HTTPGET, "HttpPost方式请求成功，返回数据如下：");  
        Log.i(TAG_HTTPGET, result);  
    } else {  
        Log.i(TAG_HTTPGET, "HttpPost方式请求失败");  
    }  
}