我想发送以下JSON文本
{"Email":"aaa@tbbb.com","Password":"123456"}
如何从Android端向Web服务发送请求并读取响应。我知道如何读取JSON，但问题是上述的JSON对象必须在变量名jason中被发送。
我该如何实现呢？需要哪些步骤，例如创建请求对象、设置内容头等等。
如何在Android中通过请求发送JSON对象？
116
- AndroidDev
8个回答
155
如果您使用Apache HTTP客户端，从Android发送JSON对象非常容易。这里是一个代码示例，演示如何实现。您应该为网络活动创建一个新的线程，以避免锁定UI线程。
protected void sendJson(final String email, final String pwd) {
Thread t = new Thread() {
public void run() {
Looper.prepare(); //For Preparing Message Pool for the child Thread
HttpClient client = new DefaultHttpClient();
HttpConnectionParams.setConnectionTimeout(client.getParams(), 10000); //Timeout Limit
HttpResponse response;
JSONObject json = new JSONObject();
try {
HttpPost post = new HttpPost(URL);
json.put("email", email);
json.put("password", pwd);
StringEntity se = new StringEntity( json.toString());
se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
post.setEntity(se);
response = client.execute(post);
/*Checking response */
if(response!=null){
InputStream in = response.getEntity().getContent(); //Get the data in the entity
}
} catch(Exception e) {
e.printStackTrace();
createDialog("Error", "Cannot Estabilish Connection");
}
Looper.loop(); //Loop in the message queue
}
};
t.start();
}
您也可以使用Google Gson来发送和获取JSON数据。
- Primal Pappachan
4
你好，可能服务器要求我设置一个名为JSON的头，并将JSON内容放在该头中，这是否可能？我发送的URL如下：
HttpPost post = new HttpPost("http://www.abc.com/xyz/usersgetuserdetails");但是它显示无效请求错误。代码的其余部分相同。另外，json = header = new JSONObject()是什么意思？ - AndroidDev
我不确定服务器期望什么样的请求。至于这个“json = header = new JSONObject();”，它只是创建了两个JSON对象。 - Primal Pappachan
@primpop - 你能否提供一个简单的PHP脚本来配合这个吗？我尝试着实现你的代码，但是我无论如何都只能发送NULL。 - kubiej21
你可以像这样将输入流（在此处是一个对象）转换为字符串：
StringWriter writer = new StringWriter();
IOUtils.copy(in, writer, "UTF-8");
String theString = writer.toString(); - Yekmer Simsek
97
Android没有用于发送和接收HTTP的特殊代码，可以使用标准的Java代码。我建议使用随Android一起提供的Apache HTTP客户端。这是我用于发送HTTP POST的代码片段。
我不明白将对象发送到名为“jason”的变量中与任何事情有关。如果你不确定服务器需要什么格式，考虑编写一个测试程序，向服务器发送各种字符串，直到你知道它需要的格式为止。
int TIMEOUT_MILLISEC = 10000; // = 10 seconds
String postMessage="{}"; //HERE_YOUR_POST_STRING.
HttpParams httpParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParams, TIMEOUT_MILLISEC);
HttpConnectionParams.setSoTimeout(httpParams, TIMEOUT_MILLISEC);
HttpClient client = new DefaultHttpClient(httpParams);
HttpPost request = new HttpPost(serverUrl);
request.setEntity(new ByteArrayEntity(
postMessage.toString().getBytes("UTF8")));
HttpResponse response = client.execute(request);
- dmazzoni
1
目前已经过时了，非常遗憾。 :( - tony gil
35
public void postData(String url,JSONObject obj) {
// Create a new HttpClient and Post Header
HttpParams myParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(myParams, 10000);
HttpConnectionParams.setSoTimeout(myParams, 10000);
HttpClient httpclient = new DefaultHttpClient(myParams );
String json=obj.toString();
try {
HttpPost httppost = new HttpPost(url.toString());
httppost.setHeader("Content-type", "application/json");
StringEntity se = new StringEntity(obj.toString());
se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
httppost.setEntity(se);
HttpResponse response = httpclient.execute(httppost);
String temp = EntityUtils.toString(response.getEntity());
Log.i("tag", temp);
} catch (ClientProtocolException e) {
} catch (IOException e) {
}
}
- Sachin Gurnani
19
HttpPost在Android Api Level 22中已被弃用。因此，请改用HttpUrlConnection。
public static String makeRequest(String uri, String json) {
HttpURLConnection urlConnection;
String url;
String data = json;
String result = null;
try {
//Connect
urlConnection = (HttpURLConnection) ((new URL(uri).openConnection()));
urlConnection.setDoOutput(true);
urlConnection.setRequestProperty("Content-Type", "application/json");
urlConnection.setRequestProperty("Accept", "application/json");
urlConnection.setRequestMethod("POST");
urlConnection.connect();
//Write
OutputStream outputStream = urlConnection.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
writer.write(data);
writer.close();
outputStream.close();
//Read
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream(), "UTF-8"));
String line = null;
StringBuilder sb = new StringBuilder();
while ((line = bufferedReader.readLine()) != null) {
sb.append(line);
}
bufferedReader.close();
result = sb.toString();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
- vikoo
8
以下链接提供了一个非常好用的Android HTTP库：
https://github.com/square/okhttp
http://loopj.com/android-async-http/
简单请求非常容易：
AsyncHttpClient client = new AsyncHttpClient();
client.get("http://www.google.com", new AsyncHttpResponseHandler() {
@Override
public void onSuccess(String response) {
System.out.println(response);
}
});
发送JSON（感谢https://github.com/loopj/android-async-http/issues/125上的`voidberg'）：
// params is a JSONObject
StringEntity se = null;
try {
se = new StringEntity(params.toString());
} catch (UnsupportedEncodingException e) {
// handle exceptions properly!
}
se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
client.post(null, "www.example.com/objects", se, "application/json", responseHandler);
所有操作都是异步的，与Android兼容，并且可以安全地从您的UI线程调用。响应处理程序将在您创建它的线程上运行（通常是您的UI线程）。它甚至还配备了一个内置的JSON响应处理程序，但我更喜欢使用Google Gson。
- Alex
3
你知道这个程序的最低SDK是多少吗？ - Esko918
如果它不是GUI，我会感到惊讶它是否有最低要求。为什么不试一下并发布你的发现呢？ - Alex
1我决定使用本地库。关于这方面有更多的信息，因为我对Android还比较新。我其实是一个iOS开发者。这样做更好，因为我正在阅读所有文档，而不仅仅是插入和播放别人的代码。谢谢。 - Esko918
3
现在由于 HttpClient 已被弃用，当前的工作代码是使用 HttpUrlConnection 建立连接并从连接中读取和写入数据。但我更喜欢使用Volley库。这个库来自于 Android AOSP。我发现它非常容易使用，可以轻松制作 JsonObjectRequest 或 JsonArrayRequest。
- Sanjeet A
2
这个非常简单。使用OkHttpLibrary。
创建你的json。
JSONObject requestObject = new JSONObject();
requestObject.put("Email", email);
requestObject.put("Password", password);
并像这样发送它。
OkHttpClient client = new OkHttpClient();
RequestBody body = RequestBody.create(JSON, json);
Request request = new Request.Builder()
.addHeader("Content-Type","application/json")
.url(url)
.post(requestObject.toString())
.build();
okhttp3.Response response = client.newCall(request).execute();
- Dave Ranjan
1
点赞指向了okhttp，这是一个有用的库，但是给出的代码并没有太大帮助。例如，RequestBody.create()传递了哪些参数？请参阅此链接以获取更多详细信息：http://www.vogella.com/tutorials/JavaLibrary-OkHttp/article.html - Dabbler
0
public class getUserProfile extends AsyncTask<Void, String, JSONArray> {
JSONArray array;
@Override
protected JSONArray doInBackground(Void... params) {
try {
commonurl cu = new commonurl();
String u = cu.geturl("tempshowusermain.php");
URL url =new URL(u);
// URL url = new URL("http://192.168.225.35/jabber/tempshowusermain.php");
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setRequestProperty("Content-Type", "application/json");
httpURLConnection.setRequestProperty("Accept", "application/json");
httpURLConnection.setDoOutput(true);
httpURLConnection.setRequestProperty("Connection", "Keep-Alive");
httpURLConnection.setDoInput(true);
httpURLConnection.connect();
JSONObject jsonObject=new JSONObject();
jsonObject.put("lid",lid);
DataOutputStream outputStream = new DataOutputStream(httpURLConnection.getOutputStream());
outputStream.write(jsonObject.toString().getBytes("UTF-8"));
int code = httpURLConnection.getResponseCode();
if (code == 200) {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream()));
StringBuffer stringBuffer = new StringBuffer();
String line;
while ((line = bufferedReader.readLine()) != null) {
stringBuffer.append(line);
}
object = new JSONObject(stringBuffer.toString());
// array = new JSONArray(stringBuffer.toString());
array = object.getJSONArray("response");
}
} catch (Exception e) {
e.printStackTrace();
}
return array;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected void onPostExecute(JSONArray array) {
super.onPostExecute(array);
try {
for (int x = 0; x < array.length(); x++) {
object = array.getJSONObject(x);
ComonUserView commUserView=new ComonUserView();// commonclass.setId(Integer.parseInt(jsonObject2.getString("pid").toString()));
//pidArray.add(jsonObject2.getString("pid").toString());
commUserView.setLid(object.get("lid").toString());
commUserView.setUname(object.get("uname").toString());
commUserView.setAboutme(object.get("aboutme").toString());
commUserView.setHeight(object.get("height").toString());
commUserView.setAge(object.get("age").toString());
commUserView.setWeight(object.get("weight").toString());
commUserView.setBodytype(object.get("bodytype").toString());
commUserView.setRelationshipstatus(object.get("relationshipstatus").toString());
commUserView.setImagepath(object.get("imagepath").toString());
commUserView.setDistance(object.get("distance").toString());
commUserView.setLookingfor(object.get("lookingfor").toString());
commUserView.setStatus(object.get("status").toString());
cm.add(commUserView);
}
custuserprof = new customadapterformainprofile(getActivity(),cm,Tab3.this);
gridusername.setAdapter(custuserprof);
// listusername.setAdapter(custuserprof);
} catch (Exception e) {
e.printStackTrace();
}
}
- Niral Dharmnathi
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