以下是我尝试执行的代码snipets但是我收到FatalErrorException但是当我尝试在浏览器中使用url运行webservice代码时
http://localhost:8082/WebServices/Rest/courseService/LoginInfo/a:a
它运行得很完美并且给出了完美的结果但是我不能用android使用下面的代码
我有这个ServiceHandlerClass，它将处理所有的webservice请求
public class ServiceHandler {
static String response = null;
public final static int GET = 1;
public final static int POST = 2;
// Default Constructor
public ServiceHandler() {
// TODO Auto-generated constructor stub
}
public String makeServiceCall(String url, int method) {
return this.makeServiceCall(url, method, null);
}
public String makeServiceCall(String url, int method, String parameter) {
try {
// http client
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpEntity httpEntity = null;
HttpResponse httpResponse = null;
// Checking http request method type
if (method == POST) {
HttpPost httpPost = new HttpPost(url);
httpResponse = httpClient.execute(httpPost);
} else if (method == GET) {
// appending params to url
if (parameter != null) {
url += parameter;
}
HttpGet httpGet = new HttpGet(url);
httpResponse = httpClient.execute(httpGet);
Log.d("Parmaeter2",parameter);
}
httpEntity = httpResponse.getEntity();
response = EntityUtils.toString(httpEntity);
} catch (Exception e){
Log.d("Service Handler Error",e.toString());
}
return response;
}
}
但我在httpResponse = httpClient.execute(httpPost);
This is my async DoInbackground code
class DoInBackground extends AsyncTask<Void, Void, Void>
{
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Please Wait...");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
ServiceHandler sh = new ServiceHandler();
String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET,ParameterToPass);
Log.d("Response: ", "> " + jsonStr);
//PojoProduct item = null;
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
jsonarray = jsonObj.getJSONArray(TAG_CONTACTS);
for (int i = 0; i < jsonarray.length(); i++) {
JSONObject c = jsonarray.getJSONObject(i);
msg = c.getString(TAG_MESSAGE);
}
} catch (Exception e) {
// TODO: handle exception
}
} else {
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
if(!msg.equals("false"))
{
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putString("Username", txtUserName.getText().toString().trim());
editor.putString("Password", txtPassword.getText().toString().trim());
editor.commit();
Intent i=new Intent(MainActivity.this,Category.class);
finish();
startActivity(i);
//System.out.println("Successful");
//Toast.makeText(getBaseContext(),"SuccessFul", Toast.LENGTH_LONG).show();
}
else
{
txtUserName.setText("");
txtPassword.setText("");
Toast.makeText(getBaseContext(),"Please Enter Valid UserName & Password.", Toast.LENGTH_LONG).show();
}
pDialog.dismiss();
}
}
以下是错误
04-10 03:30:44.850: E/AndroidRuntime(5559): Caused by: java.lang.NoSuchMethodError: org.apache.http.impl.client.DefaultHttpClient.execute
04-10 03:30:44.850: E/AndroidRuntime(5559): at com.example.shoponchat.ServiceHandler.makeServiceCall(ServiceHandler.java:52)
答案 0 :(得分：0)
不推荐使用HttpClient，如果你开始使用HttpURLConnection，那将是最好的做法。 我提供的代码可以帮助您了解如何使用HttpURLConnection .. 问我是否需要任何其他信息：）
private class GetUsers extends AsyncTask<Void, Void, String> {
String url_ = "Provide url here";
HttpURLConnection conn;
@Override
protected String doInBackground(Void... params) {
try {
URL url = new URL(url_);
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(15000);
conn.setConnectTimeout(15000);
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(os, "UTF-8"));
SharedPreferences userInfo = getSharedPreferences("mypref", 0);
String urlParameters = "username="
+ URLEncoder
.encode(userInfo.getString("username", "Null"),
"UTF-8");
writer.write(urlParameters);
writer.flush();
writer.close();
os.close();
int responseCode = conn.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
StringBuilder stringBuilder = new StringBuilder();
String line;
while ((line = bufferedReader.readLine()) != null) {
stringBuilder.append(line + '\n');
}
String jsonString = stringBuilder.toString();
System.out.println(jsonString);
jsonArray = new JSONArray(jsonString);
return "User List Loaded succesfully";
} else {
return "Error occured in Registration";
}
} catch (MalformedURLException e) {
e.printStackTrace();
System.out.println("Exception1");
} catch (IOException e) {
e.printStackTrace();
System.out.println("Exception2");
} catch (JSONException e) {
e.printStackTrace();
System.out.println("Exception3");
} finally {
conn.disconnect();
}
return "Null";
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
String[] names = new String[jsonArray.length()];
for (int i = 0; i < jsonArray.length(); i++) {
try {
JSONObject jsonObject = jsonArray.getJSONObject(i);
String username = jsonObject.getString("username");
names[i] = username;
} catch (JSONException e) {
e.printStackTrace();
System.out.println("Json array exception");
}
}
}
}