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小編給大家分享一下Android Studio連接MySql實現登錄注冊的示例代碼，相信大部分人都還不怎么了解，因此分享這篇文章給大家參考一下，希望大家閱讀完這篇文章后大有收獲，下面讓我們一起去了解一下吧！
具體如下：
1、創建一個空白工程
2、隨便起一個名稱
3、設置網絡連接權限
<uses-permission android:name="android.permission.INTERNET"/>
1、切換到普通Java工程
2、在libs當中引入MySQL的jar包
將mysql的驅動包復制到libs當中
1、在數據庫當中創建表
SQL語句
/*
Navicat MySQL Data Transfer
Source Server : localhost_3306
Source Server Version : 50562
Source Host : localhost:3306
Source Database : test
Target Server Type : MYSQL
Target Server Version : 50562
File Encoding : 65001
Date: 2021-05-10 17:28:36
*/
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for `student`
-- ----------------------------
DROP TABLE IF EXISTS `student`;
CREATE TABLE `student` (
`sid` int(11) NOT NULL AUTO_INCREMENT,
`sname` varchar(255) NOT NULL,
`sage` int(11) NOT NULL,
`address` varchar(255) NOT NULL,
PRIMARY KEY (`sid`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of student
-- ----------------------------
INSERT INTO `student` VALUES ('1', 'andi', '21', '21212');
INSERT INTO `student` VALUES ('2', 'a', '2121', '2121');
-- ----------------------------
-- Table structure for `users`
-- ----------------------------
DROP TABLE IF EXISTS `users`;
CREATE TABLE `users` (
`uid` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
`username` varchar(255) NOT NULL,
`password` varchar(255) NOT NULL,
`age` int(255) NOT NULL,
`phone` longblob NOT NULL,
PRIMARY KEY (`uid`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of users
-- ----------------------------
INSERT INTO `users` VALUES ('2', '123', 'HBV環保局', '123', '33', 0x3133333333333333333333);
INSERT INTO `users` VALUES ('3', '1233', '反復的', '1233', '12', 0x3132333333333333333333);
INSERT INTO `users` VALUES ('4', '1244', '第三代', '1244', '12', 0x3133333333333333333333);
INSERT INTO `users` VALUES ('5', '1255', 'SAS', '1255', '33', 0x3133333333333333333333);2、在Android Studio當中創建JDBCUtils類
切換會Android視圖
注意鏈接數據庫的地址是：jdbc:mysql://10.0.2.2:3306/test
package com.example.myapplication.utils;
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://10.0.2.2:3306/test","root","root");
}catch (Exception exception){
exception.printStackTrace();
}
return conn;
}
public static void close(Connection conn){
try {
conn.close();
} catch (SQLException throwables) {
throwables.printStackTrace();
}
}
}3、創建User實體類
package com.example.myapplication.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;
}
}4、創建dao層和UserDao
package com.example.myapplication.dao;
import com.example.myapplication.entity.User;
import com.example.myapplication.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 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(0);
String namedb = rs.getString(1);
String username = rs.getString(2);
String passworddb = rs.getString(3);
int age = rs.getInt(4);
String phone = rs.getString(5);
user = new User(id,namedb,username,passworddb,age,phone);
}
} catch (SQLException throwables) {
throwables.printStackTrace();
}finally {
JDBCUtils.close(con);
}
return user;
}
}1、編寫登錄頁面
<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:layout_editor_absoluteX="219dp" tools:layout_editor_absoluteY="207dp" android:padding="50dp" > <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:textSize="15sp" android:text="賬號：" /> <EditText android:id="@+id/name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:ems="10" android:inputType="textPersonName" android:text="" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:textSize="15sp" android:text="密碼：" /> <EditText android:id="@+id/password" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:ems="10" android:inputType="textPersonName" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> </LinearLayout> <Button android:layout_marginTop="50dp" android:id="@+id/button2" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="登錄" android:onClick="login" /> <Button android:id="@+id/button3" android:layout_width="match_parent" android:layout_height="wrap_content" android:onClick="reg" android:text="注冊" /> </LinearLayout> </androidx.constraintlayout.widget.ConstraintLayout>
效果
2、編寫注冊頁面代碼
<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:layout_editor_absoluteX="219dp" tools:layout_editor_absoluteY="207dp" android:padding="50dp" > <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:textSize="15sp" android:text="賬號：" /> <EditText android:id="@+id/name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:ems="10" android:inputType="textPersonName" android:text="" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:textSize="15sp" android:text="密碼：" /> <EditText android:id="@+id/password" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:ems="10" android:inputType="textPersonName" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> </LinearLayout> <Button android:layout_marginTop="50dp" android:id="@+id/button2" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="登錄" android:onClick="login" /> <Button android:id="@+id/button3" android:layout_width="match_parent" android:layout_height="wrap_content" android:onClick="reg" android:text="注冊" /> </LinearLayout> </androidx.constraintlayout.widget.ConstraintLayout>
3、完善MainActivity
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;
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() {
UserDao userDao = new UserDao();
boolean aa = userDao.login(EditTextname.getText().toString(),EditTextpassword.getText().toString());
int msg = 0;
if(aa){
msg = 1;
}
hand1.sendEmptyMessage(msg);
}
}.start();
}
final Handler hand1 = new Handler()
{
@Override
public void handleMessage(Message msg) {
if(msg.what == 1)
{
Toast.makeText(getApplicationContext(),"登錄成功",Toast.LENGTH_LONG).show();
}
else
{
Toast.makeText(getApplicationContext(),"登錄失敗",Toast.LENGTH_LONG).show();
}
}
};
}4、完善RegisterActivity
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.entity.User;
public class RegisterActivity extends AppCompatActivity {
EditText name = null;
EditText username = null;
EditText password = null;
EditText phone = null;
EditText age = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
name = findViewById(R.id.name);
username = findViewById(R.id.username);
password = findViewById(R.id.password);
phone = findViewById(R.id.phone);
age = findViewById(R.id.age);
}
public void register(View view){
String cname = name.getText().toString();
String cusername = username.getText().toString();
String cpassword = password.getText().toString();
System.out.println(phone.getText().toString());
String cphone = phone.getText().toString();
int cgae = Integer.parseInt(age.getText().toString());
if(cname.length() < 2 || cusername.length() < 2 || cpassword.length() < 2 ){
Toast.makeText(getApplicationContext(),"輸入信息不符合要求請重新輸入",Toast.LENGTH_LONG).show();
return;
}
User user = new User();
user.setName(cname);
user.setUsername(cusername);
user.setPassword(cpassword);
user.setAge(cgae);
user.setPhone(cphone);
new Thread(){
@Override
public void run() {
int msg = 0;
UserDao userDao = new UserDao();
User uu = userDao.findUser(user.getName());
if(uu != null){
msg = 1;
}
boolean flag = userDao.register(user);
if(flag){
msg = 2;
}
hand.sendEmptyMessage(msg);
}
}.start();
}
final Handler hand = new Handler()
{
@Override
public void handleMessage(Message msg) {
if(msg.what == 0)
{
Toast.makeText(getApplicationContext(),"注冊失敗",Toast.LENGTH_LONG).show();
}
if(msg.what == 1)
{
Toast.makeText(getApplicationContext(),"該賬號已經存在，請換一個賬號",Toast.LENGTH_LONG).show();
}
if(msg.what == 2)
{
//startActivity(new Intent(getApplication(),MainActivity.class));
Intent intent = new Intent();
//將想要傳遞的數據用putExtra封裝在intent中
intent.putExtra("a","註冊");
setResult(RESULT_CANCELED,intent);
finish();
}
}
};
}
以上是“Android Studio連接MySql實現登錄注冊的示例代碼”這篇文章的所有內容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內容對大家有所幫助，如果還想學習更多知識，歡迎關注億速云行業資訊頻道！
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