loopj----Android Asynchronous Http Client(AHC)

新建工具类，方便调用：

package com.blueware.rpm.util;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.BinaryHttpResponseHandler;
import com.loopj.android.http.JsonHttpResponseHandler;
import com.loopj.android.http.PersistentCookieStore;
import com.loopj.android.http.RequestParams;

public class HttpUtil {
    private static     AsyncHttpClient client; //实例话对象
    
    public static void get(String urlString,AsyncHttpResponseHandler res)    //用一个完整url获取一个string对象
    {
        client.get(urlString, res);
    }
    public static void post(String urlString,AsyncHttpResponseHandler res)    
    {
        client.post(urlString, res);
    }
    public static void get(String urlString,RequestParams params,AsyncHttpResponseHandler res)   //url里面带参数
    {
        client.get(urlString, params,res);
    }
    public static void post(String urlString, RequestParams params, AsyncHttpResponseHandler res) {
        client.post(urlString, params, res);
    }
    
    public static void get(String urlString,JsonHttpResponseHandler res)   //不带参数，获取json对象或者数组
    {
        client.get(urlString, res);
    }
    public static void post(String urlString,JsonHttpResponseHandler res)   
    {
        client.post(urlString, res);
    }
    public static void get(String urlString,RequestParams params,JsonHttpResponseHandler res)   //带参数，获取json对象或者数组
    {
        client.get(urlString, params,res);
    }
    public static void post(String urlString,RequestParams params,JsonHttpResponseHandler res)   
    {
        client.post(urlString, params,res);
    }
    public static void get(String uString, BinaryHttpResponseHandler bHandler)   //下载数据使用，会返回byte数据
    {
        client.get(uString, bHandler);
    }
    public static void post(String uString, BinaryHttpResponseHandler bHandler)  
    {
        client.post(uString, bHandler);
    }
    public static AsyncHttpClient getClient()
    {
        return client;
    }
}

就很容易的在需要请求网路的地方发送 网络请求：

import org.json.*;
import com.loopj.android.http.*;

class TwitterRestClientUsage {
    public void getPublicTimeline() throws JSONException {
        <pre name="code" class="java">    HttpUtil<span style="font-family: Arial;">.get("statuses/public_timeline.json", null, new JsonHttpResponseHandler() {</span>

@Override public void onSuccess(int statusCode, Header[] headers, JSONObject response) { // If the response is JSONObject instead of expected JSONArray } @Override public void onSuccess(int statusCode, Header[] headers, JSONArray timeline) { // Pull out the first event on the public timeline JSONObject firstEvent = timeline.get(0); String tweetText = firstEvent.getString("text"); // Do something with the response System.out.println(tweetText); } }); }}

使用PersistentCookieStore保存Cookie

这个库包含一个PersistentCookieStore ，这个类是Apache HttpClient CookieStore 接口的实现，它可以自动将cookies保存到SharedPreferences 。

如果你需要使用cookie保持认证会话，这将是特别重要的，因为即使用户关掉了应用仍然可以登录状态。

首先，创建一个AsyncHttpClient对象：

AsyncHttpClient myClient = new AsyncHttpClient();

现在将client的Cookie保存到一个PersistentCookieStore，构造方法需要有一个上下文（Activity，Application都可以，通常this就OK了）。

PersistentCookieStore myCookieStore = new PersistentCookieStore(this);
myClient.setCookieStore(myCookieStore);

注意：

以上工具类适合于HTTP请求，若是HTTPS请求，须在工具类中加一段代码：

private static boolean isSSL=true;
    static
    {   
    	if(!isSSL){
    	 client =new AsyncHttpClient(); 
    	}else{
    		client = new AsyncHttpClient(true, 80, 443);
    	}
    	 client.setEnableRedirects(false);//设置不允许重定向
        client.setTimeout(10000);   //设置链接超时，如果不设置，默认为10s
    }

OK了

Https请求下将client的Cookie保存到一个PersistentCookieStore

public void sentPostMessage() {
		String urlString = ApiConfig.LOGIN;
		RequestParams params = new RequestParams();
		params.put("username", emailEditText.getText().toString());
		params.put("password", passwdEditText.getText().toString());
		<span style="background-color: rgb(255, 204, 153);">AsyncHttpClient myClient=new AsyncHttpClient(true, 80, 443);
		PersistentCookieStore myCookieStore=new PersistentCookieStore(this);
		myClient.setCookieStore(myCookieStore);
		myClient.setEnableRedirects(false);
		myClient</span>.post(urlString, params, new AsyncHttpResponseHandler() {

			@Override
			public void onSuccess(int arg0, Header[] arg1, byte[] arg2) {
				// TODO Auto-generated method stub
				Toast.makeText(LoginActivity.this, "登录失败，请检查用户名密码是否正确" + arg1[1],
						Toast.LENGTH_LONG).show();
				checkEmail();
			}

			@Override
			public void onFailure(int arg0, Header[] arg1, byte[] arg2,
					Throwable arg3) {
。。。。。
          }
		});

	}