通过Get请求指定的URL并通过回调函数处理请求结果,同时,请求方式还支持POST和PUT,请求的同时还支持参数传递,下面看看如何通过JSON字符串作为参数访问服务器:AsyncHttpClient client = new AsyncHttpClient();
client.get("http://www.baidu.com", new AsyncHttpResponseHandler() {
@Override public void onSuccess(String response) {
System.out.println(response);
textView.setText(response);
}
@Override public void onStart() {
super.onStart();
System.out.println("onStart");
}
@Override public void onFinish() {
super.onFinish();
System.out.println("onFinish");
}
}
try {
JSONObject jsonObject = new JSONObject();
jsonObject.put("username", "ryantang");
StringEntity stringEntity = new StringEntity(jsonObject.toString());
client.post(MainActivity.this, "http://api.com/login", stringEntity, "application/json", new JsonHttpResponseHandler(){
@Override public void onSuccess(JSONObject jsonObject) {
super.onSuccess(jsonObject);
}
}
);
}
catch (JSONException e) {
e.printStackTrace();
}
catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
官方推荐的使用方法,使用一个静态的请求对象。
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:
上传: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());
}
}
}
);
}
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) {
}
}
由于涉及网络请求,最后别忘了添加权限:
连网框架下载地址