我正在开发一个 android 应用程序,它需要向 Web 服务器发送一个字符串(用 java 编写)。当服务器收到这个字符串时,它会自动触发响应。在经历了许多示例之后,我尝试这样做。 我使用以下代码发送请求。
try{
String url = "https://mywebserver";
URL obj = new URL(url);
HttpsURLConnection con = (HttpsURLConnection) obj.openConnection();
//add reuqest header
con.setRequestMethod("POST");
con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
String urlParameters = "014500000000000000000000** 0000 0030000100700006800006000000000000000 0 I 00000000 00000000000000000000000000000000000073054721143";
// Send post request
con.setDoOutput(true);
//something is wrong after this line
DataOutputStream wr = new DataOutputStream(con.getOutputStream());
wr.writeBytes(urlParameters);
wr.flush();
wr.close();
int responseCode = con.getResponseCode();
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
//print result
System.out.println(response.toString());
}catch(Exception e){
tv_str.setText("caught exception");
}
这不起作用(生成异常)。我也试过this example- answer 2但不工作和 另外,是否有用于测试 http post 请求的网络服务器。即我如何测试我的请求
如果有任何其他方法可以做到这一点,请告诉我,因为我是新手
my logcat:
07-08 11:59:37.423: D/dalvikvm(31971): Late-enabling CheckJNI
07-08 11:59:37.713: I/Adreno-EGL(31971): <qeglDrvAPI_eglInitialize:316>: EGL 1.4 QUALCOMM build: (CL4169980)
07-08 11:59:37.713: I/Adreno-EGL(31971): OpenGL ES Shader Compiler Version: 17.01.10.SPL
07-08 11:59:37.713: I/Adreno-EGL(31971): Build Date: 12/04/13 Wed
07-08 11:59:37.713: I/Adreno-EGL(31971): Local Branch: workspace
07-08 11:59:37.713: I/Adreno-EGL(31971): Remote Branch:
07-08 11:59:37.713: I/Adreno-EGL(31971): Local Patches:
07-08 11:59:37.713: I/Adreno-EGL(31971): Reconstruct Branch:
07-08 11:59:37.764: D/OpenGLRenderer(31971): Enabling debug mode 0
07-08 11:59:37.849: E/Adreno-ES20(31971): <gl_external_unsized_fmt_to_sized:2379>: QCOM> format, datatype mismatch
07-08 11:59:37.849: E/Adreno-ES20(31971): <get_texture_formats:3009>: QCOM> Invalid format!
提前致谢
最佳答案
是的,json 很简单。我实现了这个并且它工作正常..感谢 JLONG 和 user1369434。
package m.example.postrwq;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONObject;
import android.support.v7.app.ActionBarActivity;
import android.app.Activity;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity {
Button btnPost;
TextView tvIsConnected;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnPost = (Button) findViewById(R.id.button1);
tvIsConnected = (TextView) findViewById(R.id.textView1);
if(isConnected()){
tvIsConnected.setBackgroundColor(0xFF00CC00);
tvIsConnected.setText("You are conncted");
}
else{
tvIsConnected.setText("You are NOT conncted");
}
btnPost.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new HttpAsyncTask().execute("http://hmkcode.appspot.com/jsonservlet");
}});
}
private class HttpAsyncTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
return POST(urls[0]);
}
// onPostExecute displays the results of the AsyncTask.
@Override
protected void onPostExecute(String result) {
Toast.makeText(getBaseContext(), "Data Sent!", Toast.LENGTH_LONG).show();
}
}
public static String POST(String url){
InputStream inputStream = null;
String result = "";
try {
// 1. create HttpClient
HttpClient httpclient = new DefaultHttpClient();
// 2. make POST request to the given URL
HttpPost httpPost = new HttpPost(url);
String json = "my string";
// 6. set json to StringEntity
StringEntity se = new StringEntity(json);
// 7. set httpPost Entity
httpPost.setEntity(se);
// 8. Set some headers to inform server about the type of the content
httpPost.setHeader("Accept", "application/json");
httpPost.setHeader("Content-type", "application/json");
// 9. Execute POST request to the given URL
HttpResponse httpResponse = httpclient.execute(httpPost);
// 10. receive response as inputStream
inputStream = httpResponse.getEntity().getContent();
// 11. convert inputstream to string
if(inputStream != null)
result = convertInputStreamToString(inputStream);
else
result = "Did not work!";
} catch (Exception e) {
Log.d("InputStream", e.getLocalizedMessage());
}
// 12. return result
return result;
}
private static String convertInputStreamToString(InputStream inputStream) throws IOException {
// TODO Auto-generated method stub
BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(inputStream));
String line = "";
String result = "";
while((line = bufferedReader.readLine()) != null)
result += line;
inputStream.close();
return result;
}
public boolean isConnected() {
// TODO Auto-generated method stub
ConnectivityManager connMgr = (ConnectivityManager) getSystemService(Activity.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected())
return true;
else
return false;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
希望这对其他人有帮助
关于java - Http 发布请求,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24624787/