android开源框架andorid-async-http使用(下载上传文件)

应用： 从服务器获取图片地址，下载到手机显示

1、下载：https://github.com/loopj/android-async-http

2、在工程中加入jar包，或直接把源文件加到工程中

3、android-async-http文档：http://loopj.com/android-async-http/

AsyncHttp使用回调的方法处得请求的结果。

AsyncHttpClient client = new AsyncHttpClient();client.get("http://www.google.com", new AsyncHttpResponseHandler() {    @Override    public void onSuccess(String response) {        System.out.println(response);    }});

最好建一个静态的AsyncHttpClient

public class HttpUtil {

private static AsyncHttpClient client = new AsyncHttpClient(); // 实例话对象

static {

client.setTimeout(10000);// 设置链接超时，如果不设置，默认为10s

}

// 用一个完整url获取一个string对象

public static void get(String urlString, AsyncHttpResponseHandler res) 

{

client.get(urlString, res);

}

// url里面带参数

public static void get(String urlString, RequestParams params,

AsyncHttpResponseHandler res){

client.get(urlString, params, res);

}

// 不带参数，获取json对象或者数组

public static void get(String urlString, JsonHttpResponseHandler res) {

client.get(urlString, res);

}

// 带参数，获取json对象或者数组

public static void get(String urlString, RequestParams params,

JsonHttpResponseHandler res) {

client.get(urlString, params, res);

}

// 下载数据使用，会返回byte数据

public static void get(String uString, BinaryHttpResponseHandler bHandler) {

client.get(uString, bHandler);

}

public static AsyncHttpClient getClient(){

returnclient;

}

}

下载：

 

    public void downloadClick(View view) {

        String url = "http://f.hiphotos.baidu.com/album/w%3D2048/sign=38c43ff7902397ddd6799f046dbab3b7/9c16fdfaaf51f3dee973bf7495eef01f3b2979d8.jpg";

        HttpUtil.get(url, new BinaryHttpResponseHandler() {

            @Override

            public void onSuccess(byte[] arg0) {

                super.onSuccess(arg0);

                File file = Environment.getExternalStorageDirectory();

                File file2 = new File(file, "cat");

                file2.mkdir();

                file2 = new File(file2, "cat.jpg");

                try {

                    FileOutputStream oStream = new FileOutputStream(file2);

                    oStream.write(arg0);

                    oStream.flush();

                    oStream.close();

                    textView.setText("可爱的猫咪已经保存在sdcard里面");

                } catch (Exception e) {

                    e.printStackTrace();

                    Log.i("hck", e.toString());

                }

            }

        });

    }

    

上传：

    public void uploadClick(View view){

    String path="http://10.0.2.2:8080/jsontest/servlet/UploadServlet";

    File myFile = new File("/sdcard/cat/cat.jpg");

    RequestParams params = new RequestParams();

    try {

        params.put("filename", myFile);

        

        AsyncHttpClient client = new AsyncHttpClient();

        client.post(path, params, new AsyncHttpResponseHandler(){

@Override

public void onSuccess(int statusCode, String content) {

// TODO Auto-generated method stub

super.onSuccess(statusCode, content);

Toast.makeText(MainActivity.this,"上传成功！", Toast.LENGTH_LONG).show();

}

        

        

        });

        

    } catch(FileNotFoundException e) {

    

    }

    }