mysql连不上native_您好，想问问通过native.js远程通过jdbc远程连接mysql数据库，已经离线打包导入了jdbc的jar包，还是连不上。...

由于是一名刚入门的大二学生，不大了解下面是根据源码改的native.js代码

function show() {

var main = plus.android.runtimeMainActivity();

var url="jdbc:mysql://rm-uf66kxh65t4sbn14bo.mysql.rds.aliyuncs.com:3306/first";

var user="root";

var password="20170627**hhu";

//"plusready"事件触发时执行plus对象的方法

// ...

// 导入要用到的类对象

var Dri= plus.android.importClass("java.sql.DriverManager");

var res = plus.android.importClass("java.sql.ResultSet");

var con= plus.android.importClass("com.mysql.jdbc.Connection");

var sta = plus.android.importClass("com.mysql.jdbc.Statement");

plus.android.importClass("com.mysql.jdbc.Driver");

var Dr=new Dri();

var conn= Dr.getConnection(url, user, password); //链接数据库

var stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);

var rs=stmt.executeQuery("select name from student");

while(rs.next()) {

document.write(rs.getString(1));

document.write("
");

}

rs.close();

stmt.close();

conn.close();

}

这是源码

package com.hl;

import java.sql.DriverManager;

import java.sql.ResultSet;

import com.mysql.jdbc.Connection;

import com.mysql.jdbc.Statement;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

public class AndroidMsql extends Activity {

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

Button btn=(Button)findViewById(R.id.btn);

btn.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

sqlCon();

}

});

}

private void mSetText(String str){

TextView txt=(TextView)findViewById(R.id.txt);

txt.setText(str);

}

private void sqlCon(){

try {

//Class.forName("com.mysql.jdbc.Driver");

com.mysql.jdbc.Driver driver = new com.mysql.jdbc.Driver();

} catch (Exception e) {

e.printStackTrace();

}

try {

//jdbc:mysql://Android默认电脑主机IP 10.0.2.2或者你电脑的IP

String url ="jdbc:mysql://rm-uf66kxh65t4sbn14bo.mysql.rds.aliyuncs.com:3306/first";//链接数据库语句

Connection conn= (Connection) DriverManager.getConnection(url,"root","20170627**hhu"); //链接数据库

Statement stmt=(Statement) conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);

String sql="select name from student";//查询user表语句

ResultSet rs=stmt.executeQuery(sql);//执行查询

StringBuilder str=new StringBuilder();

while(rs.next()){

str.append(rs.getString(1)+"\n");

}

mSetText(str.toString());

rs.close();

stmt.close();

conn.close();

} catch (Exception e) {

e.printStackTrace();

}

}

}