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 （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）]Android Studio 实现实现学生信息的增删改查 -源代码 四（Servlet + 连接MySql数据库）

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

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

复制代码

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

1. /*Navicat MySQL Data TransferSource Server     <uses-permission android:name="android.permission.INTERNET" />    : localhost_3306Source Server Version : 50562Source Host     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> : localhost:3306Source Database     <uses-permission android:name="android.permission.INTERNET" />  : testTarget Server Type    : MYSQLTarget Server Version : 50562File Encoding     <uses-permission android:name="android.permission.INTERNET" />    : 65001Date: 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);

复制代码

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

1. package com.example.myapplication.utils;import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException;public class JDBCUtils {    static {     <uses-permission android:name="android.permission.INTERNET" />   try {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  Class.forName("com.mysql.jdbc.Driver");     <uses-permission android:name="android.permission.INTERNET" />   } catch (ClassNotFoundException e) {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  e.printStackTrace();     <uses-permission android:name="android.permission.INTERNET" />   }    }    public static Connection getConn() {     <uses-permission android:name="android.permission.INTERNET" />   Connection  conn = null;     <uses-permission android:name="android.permission.INTERNET" />   try {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  conn= DriverManager.getConnection("jdbc:mysql://10.0.2.2:3306/test","root","root");     <uses-permission android:name="android.permission.INTERNET" />   }catch (Exception exception){     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  exception.printStackTrace();     <uses-permission android:name="android.permission.INTERNET" />   }     <uses-permission android:name="android.permission.INTERNET" />   return conn;    }    public static void close(Connection conn){     <uses-permission android:name="android.permission.INTERNET" />   try {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  conn.close();     <uses-permission android:name="android.permission.INTERNET" />   } catch (SQLException throwables) {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  throwables.printStackTrace();     <uses-permission android:name="android.permission.INTERNET" />   }    }}

复制代码

3、创建User实体类

1. 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) {     <uses-permission android:name="android.permission.INTERNET" />   this.id = id;     <uses-permission android:name="android.permission.INTERNET" />   this.name = name;     <uses-permission android:name="android.permission.INTERNET" />   this.username = username;     <uses-permission android:name="android.permission.INTERNET" />   this.password = password;     <uses-permission android:name="android.permission.INTERNET" />   this.age = age;     <uses-permission android:name="android.permission.INTERNET" />   this.phone = phone;    }    public int getId() {     <uses-permission android:name="android.permission.INTERNET" />   return id;    }    public void setId(int id) {     <uses-permission android:name="android.permission.INTERNET" />   this.id = id;    }    public String getName() {     <uses-permission android:name="android.permission.INTERNET" />   return name;    }    public void setName(String name) {     <uses-permission android:name="android.permission.INTERNET" />   this.name = name;    }    public String getUsername() {     <uses-permission android:name="android.permission.INTERNET" />   return username;    }    public void setUsername(String username) {     <uses-permission android:name="android.permission.INTERNET" />   this.username = username;    }    public String getPassword() {     <uses-permission android:name="android.permission.INTERNET" />   return password;    }    public void setPassword(String password) {     <uses-permission android:name="android.permission.INTERNET" />   this.password = password;    }    public int getAge() {     <uses-permission android:name="android.permission.INTERNET" />   return age;    }    public void setAge(int age) {     <uses-permission android:name="android.permission.INTERNET" />   this.age = age;    }    public String getPhone() {     <uses-permission android:name="android.permission.INTERNET" />   return phone;    }    public void setPhone(String phone) {     <uses-permission android:name="android.permission.INTERNET" />   this.phone = phone;    }}

复制代码

4、创建dao层和UserDao

1. 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){     <uses-permission android:name="android.permission.INTERNET" />   String sql = "select * from users where name = ? and password = ?";     <uses-permission android:name="android.permission.INTERNET" />   Connection  con = JDBCUtils.getConn();     <uses-permission android:name="android.permission.INTERNET" />   try {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  PreparedStatement pst=con.prepareStatement(sql);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  pst.setString(1,name);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  pst.setString(2,password);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  if(pst.executeQuery().next()){     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> return true;     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  }     <uses-permission android:name="android.permission.INTERNET" />   } catch (SQLException throwables) {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  throwables.printStackTrace();     <uses-permission android:name="android.permission.INTERNET" />   }finally {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  JDBCUtils.close(con);     <uses-permission android:name="android.permission.INTERNET" />   }     <uses-permission android:name="android.permission.INTERNET" />   return false;    }    public boolean register(User user){     <uses-permission android:name="android.permission.INTERNET" />   String sql = "insert into users(name,username,password,age,phone) values (?,?,?,?,?)";     <uses-permission android:name="android.permission.INTERNET" />   Connection  con = JDBCUtils.getConn();     <uses-permission android:name="android.permission.INTERNET" />   try {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  PreparedStatement pst=con.prepareStatement(sql);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  pst.setString(1,user.getName());     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  pst.setString(2,user.getUsername());     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  pst.setString(3,user.getPassword());     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  pst.setInt(4,user.getAge());     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  pst.setString(5,user.getPhone());     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  int value = pst.executeUpdate();     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  if(value>0){     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> return true;     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  }     <uses-permission android:name="android.permission.INTERNET" />   } catch (SQLException throwables) {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  throwables.printStackTrace();     <uses-permission android:name="android.permission.INTERNET" />   }finally {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  JDBCUtils.close(con);     <uses-permission android:name="android.permission.INTERNET" />   }     <uses-permission android:name="android.permission.INTERNET" />   return false;    }    public User findUser(String name){     <uses-permission android:name="android.permission.INTERNET" />   String sql = "select * from users where name = ?";     <uses-permission android:name="android.permission.INTERNET" />   Connection  con = JDBCUtils.getConn();     <uses-permission android:name="android.permission.INTERNET" />   User user = null;     <uses-permission android:name="android.permission.INTERNET" />   try {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  PreparedStatement pst=con.prepareStatement(sql);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  pst.setString(1,name);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  ResultSet rs = pst.executeQuery();     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  while (rs.next()){     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />int id = rs.getInt(0);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />String namedb = rs.getString(1);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />String username = rs.getString(2);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />String passworddb  = rs.getString(3);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />int age = rs.getInt(4);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> String phone = rs.getString(5);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />user = new User(id,namedb,username,passworddb,age,phone);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  }     <uses-permission android:name="android.permission.INTERNET" />   } catch (SQLException throwables) {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  throwables.printStackTrace();     <uses-permission android:name="android.permission.INTERNET" />   }finally {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  JDBCUtils.close(con);     <uses-permission android:name="android.permission.INTERNET" />   }     <uses-permission android:name="android.permission.INTERNET" />   return user;    }}

复制代码

四、编写页面和Activity相关代码

1、编写登录页面

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

复制代码

效果

2、编写注册页面代码

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

复制代码

3、完善MainActivity

1. 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) {     <uses-permission android:name="android.permission.INTERNET" />   super.onCreate(savedInstanceState);     <uses-permission android:name="android.permission.INTERNET" />   setContentView(R.layout.activity_main);    }    public void reg(View view){     <uses-permission android:name="android.permission.INTERNET" />   startActivity(new Intent(getApplicationContext(),RegisterActivity.class));    }    public void login(View view){     <uses-permission android:name="android.permission.INTERNET" />   EditText EditTextname = (EditText)findViewById(R.id.name);     <uses-permission android:name="android.permission.INTERNET" />   EditText EditTextpassword = (EditText)findViewById(R.id.password);     <uses-permission android:name="android.permission.INTERNET" />   new Thread(){     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  @Override     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  public void run() {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> UserDao userDao = new UserDao();     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> boolean aa = userDao.login(EditTextname.getText().toString(),EditTextpassword.getText().toString());     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> int msg = 0;     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> if(aa){     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />msg = 1;     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> }     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> hand1.sendEmptyMessage(msg);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  }     <uses-permission android:name="android.permission.INTERNET" />   }.start();    }    final Handler hand1 = new Handler()    {     <uses-permission android:name="android.permission.INTERNET" />   @Override     <uses-permission android:name="android.permission.INTERNET" />   public void handleMessage(Message msg) {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  if(msg.what == 1)     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> Toast.makeText(getApplicationContext(),"登录成功",Toast.LENGTH_LONG).show();     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  }     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  else     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> Toast.makeText(getApplicationContext(),"登录失败",Toast.LENGTH_LONG).show();     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  }     <uses-permission android:name="android.permission.INTERNET" />   }    };}

复制代码

4、完善RegisterActivity

1. 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) {     <uses-permission android:name="android.permission.INTERNET" />   super.onCreate(savedInstanceState);     <uses-permission android:name="android.permission.INTERNET" />   setContentView(R.layout.activity_register);     <uses-permission android:name="android.permission.INTERNET" />    name = findViewById(R.id.name);     <uses-permission android:name="android.permission.INTERNET" />    username = findViewById(R.id.username);     <uses-permission android:name="android.permission.INTERNET" />    password = findViewById(R.id.password);     <uses-permission android:name="android.permission.INTERNET" />    phone = findViewById(R.id.phone);     <uses-permission android:name="android.permission.INTERNET" />    age = findViewById(R.id.age);    }    public void register(View view){     <uses-permission android:name="android.permission.INTERNET" />   String cname = name.getText().toString();     <uses-permission android:name="android.permission.INTERNET" />   String cusername = username.getText().toString();     <uses-permission android:name="android.permission.INTERNET" />   String cpassword = password.getText().toString();     <uses-permission android:name="android.permission.INTERNET" />   System.out.println(phone.getText().toString());     <uses-permission android:name="android.permission.INTERNET" />   String cphone = phone.getText().toString();     <uses-permission android:name="android.permission.INTERNET" />   int cgae = Integer.parseInt(age.getText().toString());     <uses-permission android:name="android.permission.INTERNET" />   if(cname.length() < 2 || cusername.length() < 2 || cpassword.length() < 2 ){     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  Toast.makeText(getApplicationContext(),"输入信息不符合要求请重新输入",Toast.LENGTH_LONG).show();     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  return;     <uses-permission android:name="android.permission.INTERNET" />   }     <uses-permission android:name="android.permission.INTERNET" />   User user = new User();     <uses-permission android:name="android.permission.INTERNET" />   user.setName(cname);     <uses-permission android:name="android.permission.INTERNET" />   user.setUsername(cusername);     <uses-permission android:name="android.permission.INTERNET" />   user.setPassword(cpassword);     <uses-permission android:name="android.permission.INTERNET" />   user.setAge(cgae);     <uses-permission android:name="android.permission.INTERNET" />   user.setPhone(cphone);     <uses-permission android:name="android.permission.INTERNET" />   new Thread(){     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  @Override     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  public void run() {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> int msg = 0;     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> UserDao userDao = new UserDao();     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> User uu = userDao.findUser(user.getName());     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> if(uu != null){     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />msg = 1;     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> }     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> boolean flag = userDao.register(user);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> if(flag){     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />msg = 2;     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> }     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> hand.sendEmptyMessage(msg);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  }     <uses-permission android:name="android.permission.INTERNET" />   }.start();    }    final Handler hand = new Handler()    {     <uses-permission android:name="android.permission.INTERNET" />   @Override     <uses-permission android:name="android.permission.INTERNET" />   public void handleMessage(Message msg) {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  if(msg.what == 0)     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> Toast.makeText(getApplicationContext(),"注册失败",Toast.LENGTH_LONG).show();     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  }     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  if(msg.what == 1)     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> Toast.makeText(getApplicationContext(),"该账号已经存在，请换一个账号",Toast.LENGTH_LONG).show();     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  }     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  if(msg.what == 2)     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  {     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> //startActivity(new Intent(getApplication(),MainActivity.class));     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> Intent intent = new Intent();     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> //将想要传递的数据用putExtra封装在intent中     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> intent.putExtra("a","註冊");     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> setResult(RESULT_CANCELED,intent);     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" /> finish();     <uses-permission android:name="android.permission.INTERNET" />     <uses-permission android:name="android.permission.INTERNET" />  }     <uses-permission android:name="android.permission.INTERNET" />   }    };}

复制代码

五、运行测试效果




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）]Android Studio 实现实现学生信息的增删改查 -源代码 四（Servlet + 连接MySql数据库）
免责声明：如果侵犯了您的权益，请联系站长，我们会及时删除侵权内容，谢谢合作！