android http请求

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方法来发送HTTP请求

4.通过DefaultHttpClient 的 execute方法来获取HttpResponse

5. 通过getEntity()从Response中获取内容

Stringcontent=EntityUtils.toString(response.getEntity());

JSON：

    /**      *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;    }

特别说明：抄的“右撇子”的。怕他最后删掉了找不着，所以复制过来了。原文链接：

http://blog.csdn.net/feng88724/article/details/6170021

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