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
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。
其他回答
注(2020年10月):以下答案中使用的AsyncTask已在Android API级别30中弃用。有关更新的示例，请参考官方文档或本博客文章
更新(2017年6月)答案，适用于Android 6.0+。感谢@Rohit Suthar， @Tamis Bolvari和@sudhiskr的评论。
public class CallAPI extends AsyncTask<String, String, String> {
public CallAPI(){
//set context variables if required
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(String... params) {
String urlString = params[0]; // URL to call
String data = params[1]; //data to post
OutputStream out = null;
try {
URL url = new URL(urlString);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
out = new BufferedOutputStream(urlConnection.getOutputStream());
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(out, "UTF-8"));
writer.write(data);
writer.flush();
writer.close();
out.close();
urlConnection.connect();
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
引用:
https://developer.android.com/reference/java/net/HttpURLConnection.html 如何使用NameValuePair使用POST添加参数到HttpURLConnection
原答案(2010年5月)
注意:此解决方案已过时。它只能在5.1版本以下的安卓设备上运行。Android 6.0及以上版本不包括本回答中使用的Apache http客户端。
来自Apache Commons的Http Client是可行的。它已经包含在android中。下面是一个简单的例子，说明如何使用它来执行HTTP Post。
public void postData() {
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://www.yoursite.com/script.php");
try {
// Add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("id", "12345"));
nameValuePairs.add(new BasicNameValuePair("stringdata", "Hi"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}
}
最好使用Apache Commons HttpClient，它已经包含在android中了。 看一看 Android开发人员:Apache HTTP客户端包摘要 一般API信息。
@primpop的答案，我会添加如何转换字符串中的响应:
HttpResponse response = client.execute(request);
HttpEntity entity = response.getEntity();
if (entity != null) {
InputStream instream = entity.getContent();
String result = RestClient.convertStreamToString(instream);
Log.i("Read from server", result);
}
下面是一个convertStramToString的例子。
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。
使用来自Square的开源okHttp库。okHttp适用于Android 2.3及以上版本，并在GitHub上拥有Apache 2.0许可证。
发送POST数据就像在AsyncTask中添加以下内容一样简单:
OkHttpClient client = new OkHttpClient();
RequestBody formBody = new FormBody.Builder()
.add("email", emailString) // A sample POST field
.add("comment", commentString) // Another sample POST field
.build();
Request request = new Request.Builder()
.url("https://yourdomain.org/callback.php") // The URL to send the data to
.post(formBody)
.build();
okHttp在maven上也有一个命名空间，所以将它添加到Android Studio项目很简单。只需将编译'com.squareup.okhttp3:okhttp:3.11.0'添加到应用程序的build.gradle中。
完整的代码
在你的活动中添加以下内容:
public class CallAPI extends AsyncTask<String, String, String> {
String emailString;
String commentString;
public CallAPI(String email, String commnt){
emailString = email;
commentString = commnt;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(String... params) {
OkHttpClient client = new OkHttpClient();
RequestBody formBody = new FormBody.Builder()
.add("email", emailString) // A sample POST field
.add("comment", commentString) // Another sample POST field
.build();
Request request = new Request.Builder()
.url("https://yourdomain.org/callback.php") // The URL to send the data to
.post(formBody)
.build();
return "";
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
}
}
并将其称为using:
new CallAPI(emailString, commentString).execute();
推荐文章
- 警告:API ' variable . getjavacompile()'已过时，已被' variable . getjavacompileprovider()'取代
- 安装APK时出现错误
- 在流中使用Java 8 foreach循环移动到下一项
- 访问限制:'Application'类型不是API(必需库rt.jar的限制)
- 用Java计算两个日期之间的天数
- 碎片中的onCreateOptionsMenu
- 如何配置slf4j-simple
- 在Jar文件中运行类
- 带参数的可运行?
- TextView粗体通过XML文件?
- 如何使线性布局的孩子之间的空间?
- 原则-如何打印出真正的sql，而不仅仅是准备好的语句?
- 如何从关联PHP数组中获得第一项?
- 我如何得到一个字符串的前n个字符而不检查大小或出界?
- 我可以在Java中设置enum起始值吗?
