android 中Network error IOException: failed to connect to /127.0.0.1 (port 1433): connect failed: ECONNREFUSED (Connection refused)

下面对android中出现的Network error IOException: failed to connect to /127.0.0.1 (port 1433): 做一下总结：

当用android程序调用本地的sqlserver的时候，当连接ip写成127.0.0.1的时候，怎么都连不通，出现以下的错误信息：

感觉好像是代码有问题或者是清单文件中某个权限忘加了，其实不是这样的。原来模拟器默认把127.0.0.1和localhost当做本身了，在模拟器上可以用10.0.2.2代替127.0.0.1和localhost，另外如果是在局域网环境可以用 192.168.0.x或者192.168.1.x(根据具体配置)连接本机,这样应该就不会报错了。

package com.example.zhouy.mytest01;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * Created by Administrator on 2017/12/14.
 */

public class DBUtil {
    private static Connection getSQLConnection(String ip,String user,String pwd,String db)
    {
        Connection con =null;
        try {
            Class.forName("net.sourceforge.jtds.jdbc.Driver");
            con = DriverManager.getConnection("jdbc:jtds:sqlserver://"+ip+":1433/"+db+";charset=utf-8",user,pwd);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return con;

    }

    public static String QuerySQL(){

        String result="";

        try {
            Connection conn = getSQLConnection("192.168.1.101","yonghuming","mima","SHUJUKU");
            String sql = "select top 10 * from users";
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery(sql);
            while(rs.next())
            {
                String s1 = rs.getString("USRNAM");
                String s2 = rs.getString("FULLNAME");
                result += s1+" - " + s2 + "\n";
                System.out.println(s1+" - "+s2);
            }
            rs.close();
            stmt.close();
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
            result += "查询数据异常！"+e.getMessage();
        }
        return result;
    }

    public static void main(String[] args){
        QuerySQL();

    }
}