使用jsp将android连接到mysql

Question

我正在尝试使用jsp连接mysql，下面是android和jsp两个文件的代码请查看它既不工作也不给我任何错误什么是问题？

的Android代码：

package com.example.prj; 

import java.io.BufferedReader; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.util.ArrayList; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
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 android.os.Bundle; 
import android.app.Activity; 
import android.content.Intent; 
import android.util.Log; 
import android.view.Menu; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.TextView; 

public class MainActivity extends Activity { 
Button submit; 
TextView tv; 
EditText et1,et2; 
String user,pass; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    submit=(Button)findViewById(R.id.button1); 
    tv=(TextView)findViewById(R.id.textView1); 
    et1=(EditText)findViewById(R.id.editText1); 
    et2=(EditText)findViewById(R.id.editText2); 
    //user=et1.getText().toString(); 
    //pass=et2.getText().toString(); 

    submit.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      try{ 
       ArrayList<BasicNameValuePair> namevaluepair=new ArrayList<BasicNameValuePair>(); 
       namevaluepair.add(new BasicNameValuePair("user", user=et1.getText().toString())); 
       namevaluepair.add(new BasicNameValuePair("pass", pass=et2.getText().toString())); 
       HttpClient client=new DefaultHttpClient(); 
       HttpPost post=new HttpPost("http://10.0.2.2:8080/login.jsp"); 
       post.setEntity(new UrlEncodedFormEntity(namevaluepair)); 
       HttpResponse response=client.execute(post); 
       HttpEntity entity=response.getEntity(); 
       InputStream in=entity.getContent(); 
       try{ 
        BufferedReader bf=new BufferedReader(new InputStreamReader(in)); 
        StringBuilder sb=new StringBuilder(); 
        String line=null; 
        while((line=bf.readLine())!=null){ 

         sb.append(line); 

        } 
        String result=sb.toString(); 
        if(result.equalsIgnoreCase("vinod")){ 
         Intent i=new Intent(MainActivity.this,loggedin.class); 

         i.putExtra("key",user); 
         startActivity(i); 
        }else{ 
         tv.setText("invalid"); 
        } 


       }catch(Exception e){ 
        e.printStackTrace(); 
       } 
      }catch(Exception e){ 
       Log.e("log_tag", "Error in http"+e.toString()); 
      } 
     } 
    }); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    getMenuInflater().inflate(R.menu.activity_main, menu); 
    return true; 
} 
} 

JSP代码：

<%@page import="java.io.*"%> 
<%@page import="java.sql.*"%> 
<%! 
String username; 
String password; 
Statement stmt=null; 
ResultSet rs=null; 
Connection con=null; 
%> 
<% 
String driver="com.example.mysql.Driver"; 
Class.forName(driver).newInstance(); 

try{ 
String url="jdbc:mysql://localhost/log"; 
    con = DriverManager.getConnection(url,"root",""); 
stmt=con.createStatement(); 

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

} 
if(!con.isClosed()){ 
username=request.getParameter("user"); 
password=request.getParameter("pass"); 
rs=stmt.executeQuery("select * from login"); 
while(rs.next()){ 
if(rs.getString("user")==username && rs.getString("pass")==password){ 
out.println("vinod"); 
System.out.println("vinod kakad"); 
}else{ 

out.println("vinod"); 
System.out.println("vinod kakad else part"); 
} 
} 
    else{ 
    out.println("lost"); 
    System.out.println("vinod kakad else lost part"); 
    } 


    } 

%> 

Answer 1

我使用下面的代码连接到从JSP页面我的MySQL数据库，Tomcat服务器

<%! String db; 
    String user; 
    String pw; 
%> 
<% 
     Class.forName("com.mysql.jdbc.Driver"); 
     Connection conn = DriverManager.getConnection("jdbc:mysql:///"+db, user, pw); 
     Statement stmt = conn.createStatement(); 
     String sql = ""; //Your SQL here 
     ResultSet rs = stmt.executeQuery(sql); 
     while (rs.next()) { 
    %><hr> 
    <%= rs.getString("<columnName")%> 
    <p> 
     <% 
      } 
     //Cleanup, just to be nice :) 
     rs.close(); 
     stmt.close(); 
     conn.close(); 
     %> 

上和这个jsp代码连接到我的数据库，但我不知道如何将它传递给Android