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、点击此处，前往github下载
2、在工程中加入jar包，或直接把源文件加到工程中
3、点击此处查看android-async-http文档

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(){
     return client；
}
}

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) {
    super.onSuccess(statusCode, content);
    Toast.makeText(MainActivity.this, "上传成功！", Toast.LENGTH_LONG).show();
    }                       
        });
    } catch(FileNotFoundException e) {    
    }
}