在android中执行从服务器获取/发布JSON响应 [英] Performing get/post from server for JSON response in android
本文介绍了在android中执行从服务器获取/发布JSON响应的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
使用http get / post时，获得JSON响应的最有效方法是什么？显然它们必须异步完成。
注意：我已经在清单文件中启用了互联网许可。
发布：
HttpPost httpPost = new HttpPost（MYDOMAIN）;
HttpResponse response = httpClient.execute（httpPost）;
获取：
HttpGet httpGet = new HttpGet（MYDOMAIN）;
HttpResponse响应= httpClient.execute（httpGet）;
解决方案
HTTP请求必须异步完成。
首先确保您的AndroidManifest.xml中有INTERNET权限
$
public class Request extends AsyncTask< List< NameValuePair>，Void，String> {
Callback.JSONCallback回调;
字符串网址;
字符串类型;
public请求（String类型，String url，Callback.JSONCallback回调）{
this.callback = callback;
extension = url;
this.type = type;
}
//做什么Async，在这种情况下是POST / GET $ b $保护字符串doInBackground（List< NameValuePair> ... pairs）{
HttpClient httpClient = new DefaultHttpClient（）;
if（type.equals（POST））{
HttpPost httpPost = new HttpPost（url）;
尝试{
//添加您的数据
httpPost.setEntity（new UrlEncodedFormEntity（pairs [0]，UTF-8））;
//执行HTTP发布请求
HttpResponse响应= httpClient.execute（httpPost）;
String result = EntityUtils.toString（response.getEntity（））;
返回结果;
} catch（Exception e）{
Log.v（error，e.toString（））;
}
} else if（type.equals（GET））{
try {
HttpGet httpGet = new HttpGet（url）;
HttpResponse响应= httpClient.execute（httpGet）;
response.getStatusLine（）。getStatusCode（）;
字符串结果= EntityUtils.toString（response.getEntity（））;
返回结果;
} catch（Exception e）{
Log.v（error，e.toString（））;
}
}
return;
//在AsyncTask
保护void onPostExecute（String feed）{
JSONObject JSON = null;
尝试{
JSON = new JSONObject（feed）;
} catch（JSONException e）{
e.printStackTrace（）;
}
callback.call（JSON）;
}
}
然后创建一个名为callback的类并创建一个接口，如下所示：
public class Callback {
public interface JSONCallback {
void call（JSONObject JSON）;
}
}
然后使用POST或GET。服务器应该返回JSON，然后你可以按照你的意愿解析它。
List< NameValuePair> nameValuePairList = new ArrayList< NameValuePair>（2）;
//不是manditory，可以用于象token这样的东西。
nameValuePairList.add（new BasicNameValuePair（ID，VALUE））;
new请求（POST，URL，new Callback.JSONCallback（）{
@Override
public void call（JSONObject JSON）{
try {
//在这里解析JSON
} catch（JSONException e）{
Log.v（error，e.toString（））;
}
}
}）。execute（nameValuePairList）;
列表< NameValuePair> nameValuePairList = new ArrayList< NameValuePair>（2）;
//不是manditory，可以用于象token这样的东西。
nameValuePairList.add（new BasicNameValuePair（ID，VALUE））;
new请求（GET，URL，new Callback.JSONCallback（）{
@Override
public void call（JSONObject JSON）{
try {
//在这里解析JSON
} catch（JSONException e）{
Log.v（error，e.toString（））;
}
}
}）。execute（nameValuePairList）;
What is the most efficient method to get a JSON response when using http get/post. Obviously they must be done asynchronously.
Note: I already have internet permissions enabled in the manifest file.
Posting:
HttpPost httpPost = new HttpPost("MYDOMAIN");
HttpResponse response = httpClient.execute(httpPost);
Getting:
HttpGet httpGet = new HttpGet("MYDOMAIN");
HttpResponse response = httpClient.execute(httpGet);
解决方案
HTTP Requests have to be done Asynchronously. First make sure you have INTERNET Permission in your AndroidManifest.xml
Then make a class for Request so you can reuse it
public class Request extends AsyncTask<List<NameValuePair>, Void, String> {
Callback.JSONCallback callback;
String url;
String type;
public Request(String type, String url, Callback.JSONCallback callback) {
this.callback = callback;
extension = url;
this.type = type;
}
// What to do Async, in this case its POST/GET
protected String doInBackground(List<NameValuePair>... pairs) {
HttpClient httpClient = new DefaultHttpClient();
if (type.equals("POST")) {
HttpPost httpPost = new HttpPost(url);
try {
// Add your data
httpPost.setEntity(new UrlEncodedFormEntity(pairs[0], "UTF-8"));
// Execute HTTP Post Request
HttpResponse response = httpClient.execute(httpPost);
String result = EntityUtils.toString(response.getEntity());
return result;
} catch (Exception e) {
Log.v("error", e.toString());
}
} else if (type.equals("GET")) {
try {
HttpGet httpGet = new HttpGet(url);
HttpResponse response = httpClient.execute(httpGet);
response.getStatusLine().getStatusCode();
String result = EntityUtils.toString(response.getEntity());
return result;
} catch (Exception e) {
Log.v("error", e.toString());
}
}
return "";
}
// What to do after AsyncTask
protected void onPostExecute(String feed) {
JSONObject JSON = null;
try {
JSON = new JSONObject(feed);
} catch (JSONException e) {
e.printStackTrace();
}
callback.call(JSON);
}
}
Then make a class called callback and make an interface like so:
public class Callback {
public interface JSONCallback {
void call(JSONObject JSON);
}
}
Then either use POST or GET. Server should return JSON and then you can parse it as you wish
List<NameValuePair> nameValuePairList = new ArrayList<NameValuePair>(2);
// Not manditory, can be used for things like token, etc.
nameValuePairList.add(new BasicNameValuePair("ID", "VALUE"));
new Request("POST", "URL", new Callback.JSONCallback() {
@Override
public void call(JSONObject JSON) {
try {
// Parse JSON here
} catch (JSONException e) {
Log.v("error", e.toString());
}
}
}).execute(nameValuePairList);
List<NameValuePair> nameValuePairList = new ArrayList<NameValuePair>(2);
// Not manditory, can be used for things like token, etc.
nameValuePairList.add(new BasicNameValuePair("ID", "VALUE"));
new Request("GET", "URL", new Callback.JSONCallback() {
@Override
public void call(JSONObject JSON) {
try {
// Parse JSON here
} catch (JSONException e) {
Log.v("error", e.toString());
}
}
}).execute(nameValuePairList);
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