可能安卓就是连不上mysql吧_安卓连不上mysql-优快云博客

本文链接：https://blog.youkuaiyun.com/vbarry215/article/details/50810905

本文介绍了一个在Android应用程序中实现MySQL数据库连接的具体示例。通过使用Java编写的应用活动，该示例展示了如何在按钮点击事件中加载并连接到远程MySQL数据库，包括异常处理。

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import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.Toast;

import com.mysql.jdbc.Connection;

import java.sql.DriverManager;
import java.sql.SQLException;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

     
        Button button = (Button) findViewById(R.id.btn);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                connectSQL();
            }
        });

    }

    private Connection getCon(){
        try {
            Class.forName("com.mysql.jdbc.Driver").newInstance();
        } catch (ClassNotFoundException e) {
            Toast.makeText(MainActivity.this,"驱动获取失败1",Toast.LENGTH_SHORT).show();
            e.printStackTrace();
        } catch (InstantiationException e) {
            Toast.makeText(MainActivity.this,"驱动获取失败2",Toast.LENGTH_SHORT).show();
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            Toast.makeText(MainActivity.this,"驱动获取失败3",Toast.LENGTH_SHORT).show();
            e.printStackTrace();
        }
        Connection con = null;
        try {
            con = (Connection) DriverManager.getConnection("jdbc:mysql://***.***.***.***:3306/*****?user=*****&password=******&useUnicode=true&characterEncoding=UTF8");
        } catch (SQLException e) {
            Toast.makeText(MainActivity.this,"远程数据库请求失败",Toast.LENGTH_SHORT).show();
            e.printStackTrace();
        }
        return con;

    }

    private void connectSQL(){

        Toast.makeText(MainActivity.this,"下面开始连接",Toast.LENGTH_SHORT).show();
        Connection conn = getCon();

        if(conn != null){
            Toast.makeText(MainActivity.this,"连接成功",Toast.LENGTH_SHORT).show();
            try {
                conn.close();
            } catch (SQLException e) {
                Toast.makeText(MainActivity.this,"数据关闭失败",Toast.LENGTH_SHORT).show();
                e.printStackTrace();
            }
        }
        else{
            Toast.makeText(MainActivity.this,"数据库连接失败",Toast.LENGTH_SHORT).show();
        }
    }

}