從android遠程服務器獲取數據

Question

我使用oracle db和weblogic作爲web服務器。 從我的Android應用程序，我可以發送參數到我的遠程服務器.. 我的問題是如何獲得由我的查詢生成的結果集從我的服務器到我的ANDROID APP？

我會很感激，如果有人點我做的一些例子...

String result = ""; 
//the year data to send 
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); 
nameValuePairs.add(new BasicNameValuePair("year","1980")); 

//http post 
try{ 
    HttpClient httpclient = new DefaultHttpClient(); 
    HttpPost httppost = new HttpPost("http://example.com/getAllPeopleBornAfter.php"); 
    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 
    HttpResponse response = httpclient.execute(httppost); 
} 

---

下面給出的代碼是我的jsp頁面...

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" 
pageEncoding="ISO-8859-1"%> 
<%@page import="java.util.*,java.sql.*"%> 

<%! 
Connection con; 
PreparedStatement ps; 
String uname,pass; 
ResultSet rs; 
%> 

<% 
try 
{ 
Class.forName("oracle.jdbc.driver.OracleDriver"); 
con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl","pro","pro"); 

ps=con.prepareStatement("select * from login_stud"); 

rs=ps.executeQuery(); 


} 
catch(Exception e) 
{ 
e.printStackTrace(); 
} 
%> 

我想讓我的android應用程序檢索結果集「rs」....並將其顯示在手機屏幕上......如何做到這一點。如果你想要的細節抵消我的應用程序，你可以問我@dldnh

Answer 1

你可以做的最好的事情是實現與RESTful網絡服務的JSON。

更多信息：

1. JSON.ORG

2. How to create a JSON response

3. Android包括JSON類，如JSONArray，JSONObject的，可以用來解釋Web服務將返回響應。請參閱here。

你不能出差錯。 JSON速度很快，如果您實施RESTFUL身份驗證，則有多種方法可以保護通信。

最棒的是，您的Web服務將與iOS應用程序和任何其他支持JSON的平臺兼容。

祝你好運！

Answer 2

的代碼是威騰在android系統應該是這樣的：

package com.campuspro.start; 

import java.util.ArrayList; 
import java.util.List; 
import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.NameValuePair; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.message.BasicNameValuePair; 
import org.apache.http.util.EntityUtils; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.app.Activity; 
import android.app.ProgressDialog; 
import android.content.Intent; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.TextView; 


public class Login_Menu extends Activity { 

EditText usname; 
EditText pass; 
TextView tv; 
HttpClient client; 
HttpPost post; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.login_lay); 
tv=(TextView) findViewById(R.id.login_stat_tv); 
usname=(EditText)findViewById(R.id.uname); 
pass=(EditText)findViewById(R.id.pass); 
Button login=(Button)findViewById(R.id.login_but); 
Button cancel=(Button)findViewById(R.id.cancel_but); 

client = new DefaultHttpClient(); 
String url="http://10.0.2.2:7001/proj/login.jsp";//your url 
post = new HttpPost(url); 
login.setOnClickListener(new View.OnClickListener() { 

    public void onClick(View arg0) { 
     new Login().execute(""); 
    } 
}); 

cancel.setOnClickListener(new View.OnClickListener() { 

    public void onClick(View v) { 
     usname.getText().clear(); 
     pass.getText().clear(); 
    } 
}); 

} 




private class Login extends AsyncTask<String, Void, JSONObject>{ 
ProgressDialog dialog = ProgressDialog.show(Login_Menu.this, "", "Authenticating, Please wait..."); 

@Override 
protected JSONObject doInBackground(String... params) { 
    Log.i("thread", "Doing Something..."); 
    //authentication operation 
try{ 

    List<NameValuePair> pairs = new ArrayList<NameValuePair>(); 
    pairs.add(new BasicNameValuePair("username",usname.getText().toString())); 
    pairs.add(new BasicNameValuePair("password",pass.getText().toString())); 
    post.setEntity(new UrlEncodedFormEntity(pairs)); 
    HttpResponse response = client.execute(post); 
    int status=response.getStatusLine().getStatusCode(); 

    if(status == 200) 
    { 
     HttpEntity e=response.getEntity(); 
     String data=EntityUtils.toString(e); 
     JSONObject last=new JSONObject(data); 
     return last; 

    } 

} 

catch(Exception e) 
{ 
    e.printStackTrace(); 

} 

    return null; 
} 

protected void onPreExecute(){ 
    //dialog.dismiss(); 
    Log.i("thread", "Started..."); 
    dialog.show(); 
} 
protected void onPostExecute(JSONObject result){ 
    Log.i("thread", "Done..."); 
    String status; 
    String name; 
    try { 
     status= result.getString("status"); 
     name=result.getString("uname"); 

     if(dialog!=null) 
     { 
     dialog.dismiss(); 
     } 
     else{} 

    if(status.equalsIgnoreCase("yes")) 
      { 
     tv.setText("Login Successful..."); 

     Bundle newbundle=new Bundle(); 
     newbundle.putString("uname",name); 

     Intent myIntent=new Intent(Login_Menu.this,Instruction.class); 
     myIntent.putExtras(newbundle); 

     startActivity(myIntent); 

     } 
     else{ 

      tv.setText("No User Found, please try again!"); 
     } 
    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 
    } 

} 

} 

而服務器端JSP代碼應該是：

<%@page contentType="text/html; charset=UTF-8"%> 
<%@page import="org.json.simple.JSONObject"%> 
<%@page import="java.util.*,java.sql.*"%> 

<%! 

Connection con; 
PreparedStatement ps; 
ResultSet rs; 
String x,y; 

%> 

<% 
Class.forName("oracle.jdbc.driver.OracleDriver"); 

con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:XE","db_username","db_password"); 
x=request.getParameter("username"); 
y=request.getParameter("password"); 

ps=con.prepareStatement("select * from table_name where suid=? and spwd=?"); 
ps.setString(1,x); 
ps.setString(2,y); 
rs=ps.executeQuery(); 


JSONObject obj=new JSONObject(); 
if(rs.next()) 
{ 
String uname=rs.getString(4); 
obj.put("status","yes"); 
obj.put("uname",uname); 
out.print(obj); 

} 
else 
{ 
obj.put("status","no"); 
out.print(obj); 
} 
out.flush(); 
%>