【Android】Http请求

比较简单直接贴代码了。

 

package jftt.test; import java.io.IOException; import java.util.List; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.NameValuePair; 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.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.params.BasicHttpParams; import org.apache.http.params.HttpConnectionParams; import org.apache.http.params.HttpParams; import android.util.Log; public class HttpRequest { /** *Post请求 */ public void doPost(String url , List<NameValuePair> nameValuePairs){ //新建HttpClient对象 HttpClient httpclient = new DefaultHttpClient(); //创建POST连接 HttpPost httppost = new HttpPost(url); try { // //使用PSOT方式，必须用NameValuePair数组传递参数 // List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); // nameValuePairs.add(new BasicNameValuePair("id", "12345")); // nameValuePairs.add(new BasicNameValuePair("stringdata","hps is Cool!")); httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); HttpResponse response = httpclient.execute(httppost); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** *Get请求 */ public void doGet(String url){ HttpParams httpParams = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpParams,30000); HttpConnectionParams.setSoTimeout(httpParams, 30000); HttpClient httpClient = new DefaultHttpClient(httpParams); // GET HttpGet httpGet = new HttpGet(url); try { HttpResponse response = httpClient.execute(httpGet); if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK){ Log.i("GET", "Bad Request!"); } } catch (IOException e) { e.printStackTrace(); } } }

 

需要主要的是:

1.   使用POST方式时，传递参数必须使用NameValuePair数组

2.   使用GET方式时，通过URL传递参数，注意写法

3.      通过setEntity方法来传递数据

4.      通过DefaultHttpClient的execute方法来发送HTTP请求获取HttpResponse

5. 通过getEntity()从Response中获取内容

 

String content = EntityUtils.toString(response.getEntity());

特别说明：

对于WCF的json服务，请求时如下：

    /** 
     *Post请求 
     * @throws IOException 
     * @throws ClientProtocolException 
     */  
    public static String doPost(String url , List<NameValuePair> nameValuePairs) throws ClientProtocolException, IOException{ 
    	String result = null;
        //新建HttpClient对象    
        HttpClient httpclient = new DefaultHttpClient();  
        //创建POST连接  
        HttpPost httppost = new HttpPost(url);  
        httppost.setHeader("content-type", "application/json");
        try {
        	if(nameValuePairs != null) {
				StringEntity entity = new StringEntity("这里是JSON数据,如{"id":"12","name":"xiaoming"}", "utf-8");
				entity.setContentType("application/json");
				entity.setContentEncoding("utf-8");
				httppost.setEntity(entity);
        	}
        	  
//        	if(nameValuePairs != null) {
//        		httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs, HTTP.UTF_8));  
//        	}
            HttpResponse response = httpclient.execute(httppost);  
            if (response.getStatusLine().getStatusCode() != 404)
            {
                    result = EntityUtils.toString(response.getEntity());
                    Logger.d(TAG, "Response: " + result);
            }
        } finally {
        	
        }
        return result;
    }

其实就相当于传数据流的方式。