连接机器人使用JSP到mysql(connect android to mysql using js

我试图用JSP MySQL的下面是这两个文件的Android的代码连接和jsp请有它的既不工作也不看给我会有什么问题的任何错误？

Android的代码：

 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数据库在Tomcat服务器上

<%! 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();
        %>

这种JSP代码连接到我的数据库，但我还不知道如何把它传递到Android

文章来源: connect android to mysql using jsp