android http請求

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請求
     */
    public void doPost(String url , List<NameValuePair> nameValuePairs){
        //新建HttpClient對象  
        HttpClient httpclient = new DefaultHttpClient();
        //創建POST連接
        HttpPost httppost = new HttpPost(url);
        try {
//            //使用PSOT方式，必須用NameValuePair數組傳遞參數
//            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請求
     */
    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方式時，傳遞參數必須使用NameValuePair數組

2.    使用GET方式時，通過URL傳遞參數，注意寫法

3.      通過setEntity方法來發送HTTP請求

4.      通過DefaultHttpClient 的 execute方法來獲取HttpResponse

5. 通過getEntity()從Response中獲取內容

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

JSON：

    /** 
     *Post請求 
     * @throws IOException 
     * @throws ClientProtocolException 
     */  
    public static String doPost(String url , List<NameValuePair> nameValuePairs) throws ClientProtocolException, IOException{ 
        String result = null;
        //新建HttpClient對象    
        HttpClient httpclient = new DefaultHttpClient();  
        //創建POST連接  
        HttpPost httppost = new HttpPost(url);  
        httppost.setHeader("content-type", "application/json");
        try {
            if(nameValuePairs != null) {
                StringEntity entity = new StringEntity("這里是JSON數據,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;
    }

特別說明：抄的“右撇子”的。怕他最后刪掉了找不着，所以復制過來了。原文鏈接：

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