Android Studio连接mysql数据库方法

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采用配置:

Android Studio北极狐+Lollipop版模拟器+Navicat15+mysql5.7.27+mysql-connector-java-5.1.38.jar

mysql下载地址

MySQL :: Download MySQL Community Server (Archived Versions)

选择:

Windows (x86, 64-bit), ZIP Archive

1、下载后解压,放在自己喜欢的文件,将bin包加入环境配置的PATH路径即可。 

2、管理员方式打开cmd,导入bin包所在目录,使用指令mysqld -install。(下载数据库)

3、使用指令mysqld -initialize。(初始化数据库)

4、回到bin上一级文件夹,发现多了几个文件夹,其中有一个data文件夹,点开进入,找到err结尾的文件,一个个用记事本打开,找到A temporary password is generated for root@localhost:,后面是你的mysql初始密码

 5、管理员打开cmd,输入net start mysql,启动数据库,输入mysql -uroot -p密码 password 新密码

6、输入mysql -uroot -p新密码,做验证,验证成功则mysql配置完成(还有一步远程配置,留在Navicat中配置)

Navicat下载地址

https://pan.baidu.com/s/1Xn_ddT8v3RgAihROPFcq_A?pwd=phu5 

下载后按照提示配置即可,记得断网。

配置完后

1、点开连接-新建连接-mysql,连接名随便取,密码为数据库密码,输入完成后,双击左侧连接,绿了说明连接成功。

2、点击上方的“用户”,双击root@localhost,将主机从localhost改为%。(这一步如果单机应该可以省略)。

3、打开cmd,输入ipconfig,找到自己的iPv4地址,在Navicat中点开连接-新建连接-mysql,连接名随便取,密码为数据库密码,主机改为自己的iPv4地址。

下载mysql-connector-java-5.1.38.jar

https://mvnrepository.com/artifact/mysql/mysql-connector-java/5.1.38

找到Files栏下载jar即可

配置android Studio

1、打开项目,导入jar包,将下载的jar包放入项目/app/libs内,右键,点击Add As Library。

2、配置环境,在AndroidManifest.xml中加入

<uses-permission android:name="android.permission.INTERNET" />

3、 编写类,一共要编写三个类:JDBCUtils、User、UserDao。JDBCUtils用于连接数据库,User是信息存储类,UserDao是数据库与前端交互类。

编写类

JDBCUtils类: 

package utils;

import android.util.Log;

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

public class JDBCUtils 
    private static final String TAG = "mysql11111";
    static 

        try 
            Class.forName("com.mysql.jdbc.Driver");
            Log.v(TAG, "加载JDBC驱动成功");
         catch (ClassNotFoundException e) 
            Log.e(TAG, "加载JDBC驱动失败");
            e.printStackTrace();
        

    

    public static Connection getConn() 
        Connection  conn = null;
        try 
            conn= DriverManager.getConnection("jdbc:mysql://10.0.2.2:3306/lls?useUnicode=true&characterEncoding=utf-8&useSSL=false","root","123456");
            Log.d(TAG, "数据库连接成功");
        catch (Exception exception)
            Log.d(TAG, "数据库连接失败");
            exception.printStackTrace();
        
        return conn;
    

    public static void close(Connection conn)
        try 
            conn.close();
         catch (SQLException throwables) 
            throwables.printStackTrace();
        
    

后续如果出现问题可以单击下方Logcat,点击搜索框,输入设定的TAG(此处设定为mysql111111),查看驱动是否成功,连接是否成功。

上面的static是进行驱动。getConn函数是获取一个连接,如果连接失败了,返回的conn就是个空。

getConnection函数内10.0.2.2:3306/后的是数据库名,此处需要在Navicat中,打开自己的连接后,右键连接,创建数据库。后续的两个变量是用户名和密码。

close函数是关闭数据库。

User类:

package entity;

public class User 

    private int id;
    private String name;
    private int age;
    private String password;
    private String phone_number;
    private String address;

    public User()
    

    public User(int id,String name,int age,String password,String phone_number,String address)
        this.id=id;
        this.name=name;
        this.age=age;
        this.password=password;
        this.phone_number=phone_number;
        this.address=address;
    

    public int getId()
        return id;
    
    public void setId(int id)
        this.id=id;
    

    public String getName()
        return name;
    
    public void setName(String name)
        this.name=name;
    

    public int getAge()
        return age;
    
    public void setAge(int age)
        this.age=age;
    

    public String getPassword()
        return password;
    
    public void setPassword(String password)
        this.password=password;
    

    public String getPhone_number()
        return phone_number;
    
    public void setPhone_number(String phone_number)
        this.phone_number=phone_number;
    

    public String getAddress()
        return address;
    
    public void setAddress(String address)
        this.address=address;
    

非常明显,就是一个存储用户信息类,没什么好说的。

UserDao:

package dao;

import entity.User;
import utils.JDBCUtils;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class UserDao 
    public boolean login(String phone_number,String password)
        
        String sql = "select * from users where phone_number = ? and password = ?";

        Connection  con = JDBCUtils.getConn();

        try 
            PreparedStatement pst=con.prepareStatement(sql);

            pst.setString(1,phone_number);
            pst.setString(2,password);

            if(pst.executeQuery().next())

                return true;

            

         catch (SQLException throwables) 
            throwables.printStackTrace();
        finally 
            JDBCUtils.close(con);
        

        return false;
    

    public User findUser(String name)

        String sql = "select * from users where name = ?";

        Connection  con = JDBCUtils.getConn();
        User user = null;
        try 
            PreparedStatement pst=con.prepareStatement(sql);

            pst.setString(1,name);

            ResultSet rs = pst.executeQuery();

            while (rs.next())

                int id = rs.getInt(0);
                String namedb = rs.getString(1);
                int age = rs.getInt(2);
                String passworddb  = rs.getString(3);
                String phone_number = rs.getString(4);
                String address = rs.getString(5);
                user = new User(id,namedb,age,passworddb,phone_number,address);
            

         catch (SQLException throwables) 
            throwables.printStackTrace();
        finally 
            JDBCUtils.close(con);
        

        return user;
    
    public User findPhone_number(String phone_number)

        String sql = "select * from users where phone_number = ?";

        Connection  con = JDBCUtils.getConn();
        User user = null;
        try 
            PreparedStatement pst=con.prepareStatement(sql);

            pst.setString(1,phone_number);

            ResultSet rs = pst.executeQuery();

            while (rs.next())

                int id = rs.getInt(0);
                String namedb = rs.getString(1);
                int age = rs.getInt(2);
                String passworddb  = rs.getString(3);
                String phone_numberdb = rs.getString(4);
                String address = rs.getString(5);
                user = new User(id,namedb,age,passworddb,phone_numberdb,address);
            

         catch (SQLException throwables) 
            throwables.printStackTrace();
        finally 
            JDBCUtils.close(con);
        

        return user;
    

可以稍微学一下语法,这里主要用到sql语句,设计的函数就算最基本的用于我们的页面搭建中的login、findUser等函数了。页面搭建的过程中也只需要调用这个类中的这几个函数即可。

Android Studio 实现登录注册-源代码 二(Servlet + 连接MySql数据库)

Android Studio 实现登录注册-源代码 (连接MySql数据库)
Android Studio 实现登录注册-源代码 二(Servlet + 连接MySql数据库)
[Android Studio 实现登录注册-源代码 三(Servlet + 连接MySql数据库)实现学生信息的查询 (JSON通信)]

一、Android 项目当中设置明文传输

1、设置明文传输的xml

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<?xml version="1.0" encoding="UTF-8"?>
<network-security-config>
    <base-config cleartextTrafficPermitted="true"/>
</network-security-config>

2、引入上述创建的xml

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android:networkSecurityConfig="@xml/network_security_config"

二、在MyEclipse当中创建Web项目

1、创建项目

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引入MySQL的驱动包
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2、创建实体类User

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package entity;

public class User {

    private int id;
    private String name;
    private String username;
    private String password;
    private int age;
    private String phone;


    public User() {
    }

    public User(int id, String name, String username, String password, int age, String phone) {
        this.id = id;
        this.name = name;
        this.username = username;
        this.password = password;
        this.age = age;
        this.phone = phone;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
}

3、创建JDBCUtils工具类

在这里插入图片描述

package dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class JDBCUtils {
    static {

        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
    public static Connection getConn() {
        Connection  conn = null;
        try {
            conn=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test","root","root");
        }catch (Exception exception){
            exception.printStackTrace();
        }
        return conn;
    }

    public static void close(Connection conn){
        try {
            conn.close();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }
}

4、创建UserDao类

在这里插入图片描述

package dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import entity.User;

public class UserDao {


    public boolean login(String name,String password){

        String sql = "select * from users where name = ? and password = ?";

        Connection  con = JDBCUtils.getConn();

        try {
            PreparedStatement pst=con.prepareStatement(sql);

            pst.setString(1,name);
            pst.setString(2,password);

            if(pst.executeQuery().next()){

                return true;

            }

        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            JDBCUtils.close(con);
        }

        return false;
    }

    public boolean register(User user){

        String sql = "insert into users(name,username,password,age,phone) values (?,?,?,?,?)";

        Connection  con = JDBCUtils.getConn();

        try {
            PreparedStatement pst=con.prepareStatement(sql);

            pst.setString(1,user.getName());
            pst.setString(2,user.getUsername());
            pst.setString(3,user.getPassword());
            pst.setInt(4,user.getAge());
            pst.setString(5,user.getPhone());

            int value = pst.executeUpdate();

            if(value>0){
                return true;
            }


        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            JDBCUtils.close(con);
        }
        return false;
    }

    public User findUser(String name){

        String sql = "select * from users where name = ?";

        Connection  con = JDBCUtils.getConn();
        User user = null;
        try {
            PreparedStatement pst=con.prepareStatement(sql);

            pst.setString(1,name);

            ResultSet rs = pst.executeQuery();

            while (rs.next()){

               int id = rs.getInt(1);
               String namedb = rs.getString(2);
               String username = rs.getString(3);
               String passworddb  = rs.getString(4);
               int age = rs.getInt(5);
                String phone = rs.getString(6);
               user = new User(id,namedb,username,passworddb,age,phone);
            }

        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            JDBCUtils.close(con);
        }

        return user;
    }


}

5、创建对应的LoginServlet

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package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import dao.UserDao;

public class LoginServlet extends HttpServlet {
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doPost(request, response);
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String name = request.getParameter("name");
		String password =  request.getParameter("password");
		response.setCharacterEncoding("UTF-8");
		UserDao dao = new UserDao();
		boolean login = dao.login(name, password);
		String msg = "";
		if(login){
			msg = "成功";
		}else{
			msg = "失败";
		}
		PrintWriter out = response.getWriter();
		out.println(msg);
		out.flush();
		out.close();
	}

	

}

三、在Android Studio当中调用Servlet

(一)实现登录功能

1、创建连接Servlet的工具类(PostUtil)

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在这里插入图片描述

package com.example.application01.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

//访问servlet
public class PostUtil {


    //访问的serlver不一样
    //传递的参数不一样

    public static String Post(String url,String data)
    {
        String msg = "";
        try{
            //http://ms-yffprtappszi:8080/AndroidWeb/LoginServlet
            HttpURLConnection conn = (HttpURLConnection) new URL("http://10.0.2.2:8080/AndroidWeb/"+url).openConnection();
            //设置请求方式,请求超时信息
            conn.setRequestMethod("POST");
            conn.setReadTimeout(5000);
            conn.setConnectTimeout(5000);
            //设置运行输入,输出:
            conn.setDoOutput(true);
            conn.setDoInput(true);
            //Post方式不能缓存,需手动设置为false
            conn.setUseCaches(false);
            //我们请求的数据:


            //获取输出流
            OutputStream out = conn.getOutputStream();
            out.write(data.getBytes());
            out.flush();
            if (conn.getResponseCode() == 200) {
                // 获取响应的输入流对象
                InputStream is = conn.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(is));
                StringBuffer response = new StringBuffer();

                String line=null;
                while ((line = reader.readLine()) != null) {
                    response.append(line);
                }
                msg=response.toString();


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

2、在MainActivity调用这个类

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package com.example.application01;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import com.example.application01.dao.UserDao;
import com.example.application01.utils.PostUtil;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

public class MainActivity extends AppCompatActivity {

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

    public void reg(View view){

        startActivity(new Intent(getApplicationContext(),RegisterActivity.class));

    }


    public void login(View view){

        EditText EditTextname = (EditText)findViewById(R.id.name);
        EditText EditTextpassword = (EditText)findViewById(R.id.password);

        new Thread(){
            @Override
            public void run() {

                String data="";
                try {
                    data = "name="+ URLEncoder.encode(EditTextname.getText().toString(), "UTF-8")+
                            "&password="+ URLEncoder.encode(EditTextpassword.getText().toString(), "UTF-8");
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }

                String request = PostUtil.Post("LoginServlet",data);

                int msg = 0;
                if(request.equals("成功")){
                    msg = 1;
                }

                hand1.sendEmptyMessage(msg);


            }
        }.start();


    }
    final Handler hand1 = new Handler()
    {
        @Override
        public void handleMessage(Message msg) {

            if(msg.what == 1)
            {
                Toast.makeText(getApplicationContext(),"登录成功",Toast.LENGTH_LONG).show();

            }
            else
            {
                Toast.makeText(getApplicationContext(),"登录失败",Toast.LENGTH_LONG).show();
            }
     

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