Android Studio 实现登录注册-源代码 (连接MySql数据库)
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一、创建工程
1、创建一个空白工程
2、随便起一个名称
3、设置网络连接权限
<uses-permission android:name="android.permission.INTERNET" />
二、引入mysql驱动包
1、切换到普通Java工程
2、在libs当中引入MySQL的jar包
将mysql的驱动包复制到libs当中
三、编写数据库和dao以及JDBC相关代码
1、在数据库当中创建表
SQL语句
/*
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环保局', '123', '33', 0x3133333333333333333333);
INSERT INTO `users` VALUES ('3', '1233', '反复的', '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当中创建JDBCUtils类
切换会Android视图
注意链接数据库的地址是: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、创建User实体类
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、创建dao层和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;
}
}
四、编写页面和Activity相关代码
1、编写登录页面
<?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="账号:" />
<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="密码:"
/>
<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"
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