我对PHP、JavaScript和许多其他脚本语言很有经验，但我对Java或Android没有太多经验。
我正在寻找一种方法将POST数据发送到PHP脚本并显示结果。
当前回答
下面的方法适用于最新的Android库和使用okhttp。
OkHttpClient client = new OkHttpClient();
RequestBody formBody = new FormBody.Builder()
.add("key1", "value1")
.add("key2", "value2") //optional
.add("key3", "value3") //optional
.add("key4", "value4") //optional
.build();
Request request = new Request.Builder()
.url("http://.....") //URL
.post(formBody)
.build();
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(@NonNull Call call, @NonNull IOException e) {
e.getStackTrace();
}
@Override
public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {
if(response.isSuccessful()){
ResponseBody responseBody = response.body();
Log.e("TAG_", responseBody.string());
}
}
其他回答
在新版本的Android中，你必须把所有的web I/O请求放到一个新的线程中。AsyncTask最适合小请求。
下面的方法适用于最新的Android库和使用okhttp。
OkHttpClient client = new OkHttpClient();
RequestBody formBody = new FormBody.Builder()
.add("key1", "value1")
.add("key2", "value2") //optional
.add("key3", "value3") //optional
.add("key4", "value4") //optional
.build();
Request request = new Request.Builder()
.url("http://.....") //URL
.post(formBody)
.build();
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(@NonNull Call call, @NonNull IOException e) {
e.getStackTrace();
}
@Override
public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {
if(response.isSuccessful()){
ResponseBody responseBody = response.body();
Log.e("TAG_", responseBody.string());
}
}
如果你只是想把数据附加到Url，你可以通过使用httppurlconnection来实现，因为HttpClient现在已经弃用了。 更好的方法是使用像-这样的库
凌空抽射 改造
我们可以将数据发送到php脚本，并通过使用AsyncTask类执行的代码来获取结果并显示它。
private class LongOperation extends AsyncTask<String, Void, Void> {
// Required initialization
private String Content;
private String Error = null;
private ProgressDialog Dialog = new ProgressDialog(Login.this);
String data ="";
int sizeData = 0;
protected void onPreExecute() {
// NOTE: You can call UI Element here.
//Start Progress Dialog (Message)
Dialog.setMessage("Please wait..");
Dialog.show();
Dialog.setCancelable(false);
Dialog.setCanceledOnTouchOutside(false);
try{
// Set Request parameter
data +="&" + URLEncoder.encode("username", "UTF-8") + "="+edittext.getText();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// Call after onPreExecute method
protected Void doInBackground(String... urls) {
/************ Make Post Call To Web Server ***********/
BufferedReader reader=null;
// Send data
try
{
// Defined URL where to send data
URL url = new URL(urls[0]);
// Send POST data request
URLConnection conn = url.openConnection();
conn.setConnectTimeout(5000);//define connection timeout
conn.setReadTimeout(5000);//define read timeout
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write( data );
wr.flush();
// Get the server response
reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
// Read Server Response
while((line = reader.readLine()) != null)
{
// Append server response in string
sb.append(line + " ");
}
// Append Server Response To Content String
Content = sb.toString();
}
catch(Exception ex)
{
Error = ex.getMessage();
}
finally
{
try
{
reader.close();
}
catch(Exception ex) {}
}
return null;
}
protected void onPostExecute(Void unused) {
// NOTE: You can call UI Element here.
// Close progress dialog
Dialog.dismiss();
if (Error != null) {
Toast.makeText(getApplicationContext(),"Error encountered",Toast.LENGTH_LONG).show();
}
else {
try {
JSONObject jsonRootObject = new JSONObject(Content);
JSONObject json2 =jsonRootObject.getJSONObject("jsonkey");//pass jsonkey here
String id =json2.optString("id").toString();//parse json to string through parameters
//the result is stored in string id. you can display it now
} catch (JSONException e) {e.printStackTrace();}
}
}
}
但是使用诸如volley或retrofit之类的库是更好的选择，因为Asynctask类和HttpurlConnection相比库更慢。此外，库将获取所有内容，也更快。
方法将数据作为HTTP请求发布，
public static InputStream callPostService(String Url,
List<NameValuePair> data) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(Url);
try {
httppost.setEntity(new UrlEncodedFormEntity(data));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
return entity.getContent();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
5 . for Android = >
org.apache.http类和AndroidHttpClient类在Android 5.1中已弃用。这些类不再被维护，你应该尽快将任何使用这些api的应用程序代码迁移到URLConnection类。
https://developer.android.com/about/versions/android-5.1.html#http
考虑使用HttpUrlConnection共享我的代码
public String performPostCall(String requestURL,
HashMap<String, String> postDataParams) {
URL url;
String response = "";
try {
url = new URL(requestURL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(15000);
conn.setConnectTimeout(15000);
conn.setRequestMethod("GET");
conn.setDoInput(true);
conn.setDoOutput(true);
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(os, "UTF-8"));
writer.write(getPostDataString(postDataParams));
writer.flush();
writer.close();
os.close();
int responseCode=conn.getResponseCode();
if (responseCode == HttpsURLConnection.HTTP_OK) {
String line;
BufferedReader br=new BufferedReader(new InputStreamReader(conn.getInputStream()));
while ((line=br.readLine()) != null) {
response+=line;
}
}
else {
response="";
}
} catch (Exception e) {
e.printStackTrace();
}
return response;
}
...
private String getPostDataString(HashMap<String, String> params) throws UnsupportedEncodingException{
StringBuilder result = new StringBuilder();
boolean first = true;
for(Map.Entry<String, String> entry : params.entrySet()){
if (first)
first = false;
else
result.append("&");
result.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
result.append("=");
result.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
}
return result.toString();
}
你也可以张贴方法:
conn.setRequestMethod("POST");
更新21/02/2016
对于post request with json，请看这个例子:
public class Empty extends
AsyncTask<Void, Void, Boolean> {
String urlString = "http://www.yoursite.com/";
private final String TAG = "post json example";
private Context context;
private int advertisementId;
public Empty(Context contex, int advertisementId) {
this.context = contex;
this.advertisementId = advertisementId;
}
@Override
protected void onPreExecute() {
Log.e(TAG, "1 - RequestVoteTask is about to start...");
}
@Override
protected Boolean doInBackground(Void... params) {
boolean status = false;
String response = "";
Log.e(TAG, "2 - pre Request to response...");
try {
response = performPostCall(urlString, new HashMap<String, String>() {
private static final long serialVersionUID = 1L;
{
put("Accept", "application/json");
put("Content-Type", "application/json");
}
});
Log.e(TAG, "3 - give Response...");
Log.e(TAG, "4 " + response.toString());
} catch (Exception e) {
// displayLoding(false);
Log.e(TAG, "Error ...");
}
Log.e(TAG, "5 - after Response...");
if (!response.equalsIgnoreCase("")) {
try {
Log.e(TAG, "6 - response !empty...");
//
JSONObject jRoot = new JSONObject(response);
JSONObject d = jRoot.getJSONObject("d");
int ResultType = d.getInt("ResultType");
Log.e("ResultType", ResultType + "");
if (ResultType == 1) {
status = true;
}
} catch (JSONException e) {
// displayLoding(false);
// e.printStackTrace();
Log.e(TAG, "Error " + e.getMessage());
} finally {
}
} else {
Log.e(TAG, "6 - response is empty...");
status = false;
}
return status;
}
@Override
protected void onPostExecute(Boolean result) {
//
Log.e(TAG, "7 - onPostExecute ...");
if (result) {
Log.e(TAG, "8 - Update UI ...");
// setUpdateUI(adv);
} else {
Log.e(TAG, "8 - Finish ...");
// displayLoding(false);
// finish();
}
}
public String performPostCall(String requestURL,
HashMap<String, String> postDataParams) {
URL url;
String response = "";
try {
url = new URL(requestURL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(context.getResources().getInteger(
R.integer.maximum_timeout_to_server));
conn.setConnectTimeout(context.getResources().getInteger(
R.integer.maximum_timeout_to_server));
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setRequestProperty("Content-Type", "application/json");
Log.e(TAG, "11 - url : " + requestURL);
/*
* JSON
*/
JSONObject root = new JSONObject();
//
String token = Static.getPrefsToken(context);
root.put("securityInfo", Static.getSecurityInfo(context));
root.put("advertisementId", advertisementId);
Log.e(TAG, "12 - root : " + root.toString());
String str = root.toString();
byte[] outputBytes = str.getBytes("UTF-8");
OutputStream os = conn.getOutputStream();
os.write(outputBytes);
int responseCode = conn.getResponseCode();
Log.e(TAG, "13 - responseCode : " + responseCode);
if (responseCode == HttpsURLConnection.HTTP_OK) {
Log.e(TAG, "14 - HTTP_OK");
String line;
BufferedReader br = new BufferedReader(new InputStreamReader(
conn.getInputStream()));
while ((line = br.readLine()) != null) {
response += line;
}
} else {
Log.e(TAG, "14 - False - HTTP_OK");
response = "";
}
} catch (Exception e) {
e.printStackTrace();
}
return response;
}
}
更新24/08/2016
使用一些最好的库，例如:
改造 凌空抽射
因为:
避免使用HttpUrlConnection和HttpClient
在较低的API级别上(主要是在Gingerbread和Froyo上)，httppurlconnection和HttpClient还远远不够完美
并且避免AsyncTask 他们要快得多 他们会缓存所有东西
自从Honeycomb (API 11)引入以来，强制在不同于主线程的单独线程上执行网络操作
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