我的Java文件：
公共类ReportStudent2扩展了Activity {
Activity context;
HttpPost httppost;
StringBuffer buffer;
HttpResponse response;
HttpClient httpclient;
ProgressDialog pdnew;
ListAdapter3 adapternew;
ListView listProduct;
ArrayList<Product3> records;
protected void onCreate(Bundle savedInstanceState) {
//TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.report_student2);
context=this;
records=new ArrayList<Product3>();
listProduct=(ListView)findViewById(R.id.product_list1);
adapternew= new ListAdapter3(context, R.layout.model_report_student2,R.id.pro_name2,
records);
listProduct.setAdapter(adapternew);
}
public void onStart(){
super.onStart();
//execute background task
BackTask bt=new BackTask();
bt.execute();
}
//background process to make a request to server and list product information
private class BackTask extends AsyncTask<Void,Void,Void>{
protected void onPreExecute(){
super.onPreExecute();
pdnew = new ProgressDialog(context);
pdnew.setTitle("Retrieving data");
pdnew.setMessage("Please wait.");
pdnew.setCancelable(true);
pdnew.setIndeterminate(true);
pdnew.show();
}
protected Void doInBackground(Void...params){
InputStream is=null;
String result="";
try{
httpclient=new DefaultHttpClient();
SharedPreferences sharedPreferences = getSharedPreferences(ConfigFaculty.SHARED_PREF_NAME2, Context.MODE_PRIVATE);
String username = sharedPreferences.getString(ConfigFaculty.USERNAME_SHARED_PREF2, "Not Available");
Intent i=getIntent();
String course_name=i.getStringExtra("course_name");
String url="http://192.168.43.213/Login/student_login/courses2.php?username=" +username + "&course_name=" +course_name;
httppost= new HttpPost(new URI(url.replace(" ","%20")));
response=httpclient.execute(httppost);
Log.d("Ed","Request Sent");
HttpEntity entity = response.getEntity();
// Get our response as a String.
is = entity.getContent();
}catch(Exception e){
if(pdnew!=null)
pdnew.dismiss(); //close the dialog if error occurs
Log.e("ERROR", e.getMessage());
}
//convert response to string
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf-8"),8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line+"\n");
}
is.close();
result=sb.toString();
Log.d("Data Parsed",result);
}catch(Exception e){
Log.e("ERROR", "Error converting result "+e.toString());
}
//parse json data
try{
// Remove unexpected characters that might be added to beginning of the string
result=result.substring(result.indexOf("["));
JSONArray jArray =new JSONArray(result);
for(int i=0;i<jArray.length();i++){
JSONObject json_data =jArray.getJSONObject(i);
Product3 p=new Product3();
p.setDate(json_data.getString("Date"));
p.setStatus(json_data.getInt("status"));
records.add(p);
}
}
catch(Exception e){
Log.e("ERROR", "Error parsing data "+e.toString());
}
return null;
}
protected void onPostExecute(Void result){
if(pdnew!=null) pdnew.dismiss(); //close dialog
Log.e("size", records.size() + "");
adapternew.notifyDataSetChanged(); //notify the ListView to get new records
}
}
}
dbConnect.php：
<?php
define('HOST','localhost');
define('USER','root');
define('PASS','');
define('DB','nit_agartala');
$con = mysqli_connect(HOST,USER,PASS,DB) or die('Unable to Connect');
?>
courses.php
<?php
$username = $_POST['username'];
$course_name = $_POST['course_name'];
require_once('dbConnect.php');
$sql = mysqli_query($con,"SELECT Date,status FROM attendance NATURAL JOIN course WHERE stud_id = '$username' AND course_name = '$course_name'");
$result = array();
while($row1 = mysqli_fetch_array($sql)){
array_push($result,array(
'Date'=>$row1['Date'],
'status'=>$row1['status']
));
}
echo (json_encode($result));
mysqli_close($con);
?>
我通过参数将数据发送到php文件。但是我想通过httppost中的php body传递数据。为此我得到错误。我该怎么办？