Android studio连接MySQL并完成简单的登录注册功能
近期需要完成一个Android项目，那先从与数据库交互最简单的登陆注册开始吧，现记录过程如下：此篇文章的小demo主要涉及数据库的连接，以及相应信息的查找与插入。
我已将源码上传至GitHub：https://github.com/changyan-maker/LoginApp
首先展示一下完成效果。
数据库设计：
https://img-blog.csdnimg.cn/11dfb5356ced4ba0a298bec3363794e2.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
数据库内容：
https://img-blog.csdnimg.cn/fc5fb317e65f4aa69d08463f83037aa7.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
登录结果展示：
https://img-blog.csdnimg.cn/b6e9bc0d1c9a4cc3ae426a52cf7937c3.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_13,color_FFFFFF,t_70,g_se,x_16
https://img-blog.csdnimg.cn/645d0dc3032f4fde92cdb5c9f4d3f60f.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_13,color_FFFFFF,t_70,g_se,x_16
https://img-blog.csdnimg.cn/28aff8dedfc44343995bf20f75557f54.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_13,color_FFFFFF,t_70,g_se,x_16
https://img-blog.csdnimg.cn/6fb8f4d7c4484fdc8ca82dccb3f84e4f.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_14,color_FFFFFF,t_70,g_se,x_16
https://img-blog.csdnimg.cn/b5bb698177154abd9ac8f7b8fded5a3d.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_13,color_FFFFFF,t_70,g_se,x_16
https://img-blog.csdnimg.cn/ce37b60baa7b4099b279d9b09dc4301d.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_14,color_FFFFFF,t_70,g_se,x_16
https://img-blog.csdnimg.cn/7e60cbdd16ec46ae8d7bc70d72eb8c6c.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
此处默认您已经安装好Android studio 与MySQL软件。
首先需要创建一个空项目，关于空的项目如何创建，请参考我本篇文章：
https://blog.csdn.net/changyana/article/details/122948513
接下来需要连接MySQL，首先需要开启网络权限。需要添加一句话，具体位置如图：（将项目切换成Android模式比较好找）
https://img-blog.csdnimg.cn/2e290cbede504757b4a218fba48949d3.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
之后是导入Mysql-connection的jar包
关于这个jar包需要我们去官网下载：https://downloads.mysql.com/archives/c-j/
https://img-blog.csdnimg.cn/b2bbb8304e2b488588da588ca5f262f3.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
关于版本的选择个人建议选择老一点的，比较稳定。选择ZIP格式进行下载。
https://img-blog.csdnimg.cn/100a98cfacfe4bd7b339265ec405f626.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
下载完成后在里边找到mysql-connector-java-5.1.47-bin.jar并复制到粘贴板。
https://img-blog.csdnimg.cn/295f4a9730ac442ca9efe07b3f92499d.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
然后将Android studio的项目页面切换到Project模式，找到如下文件的位置进行粘贴。
https://img-blog.csdnimg.cn/afc42abae6f0471d9e38f5a0a7474039.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
https://img-blog.csdnimg.cn/30e020f2bdf6477682af5a87a790fbd0.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
粘贴完成后需要把刚才导入的jar包右击Add as Library
https://img-blog.csdnimg.cn/8e1ca037f1614df4a9ca6a631e17b6ca.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
https://img-blog.csdnimg.cn/0420ee7257144e3da92dfb1f5356ab40.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
然后切换回Android视图，操作如下，新建一个package
https://img-blog.csdnimg.cn/cc718d1108e641bba6381637da50ce0f.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
https://img-blog.csdnimg.cn/e3b5886319ca46489e4a956652448863.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
https://img-blog.csdnimg.cn/0425e0aa0b4d43f48d3bfd54fc650175.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
https://img-blog.csdnimg.cn/3b7e0bd3e66f4dea819c88fca187cda7.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
然后粘贴代码如下：
https://img-blog.csdnimg.cn/1e2c1cde586d4abca9f6a25a9fc990a8.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
本篇文章从图片可以看到我的项目名称为HelloWorld，这个项目只是我用来做测试的。但是代码是我完善后放在另一个项目为party中的，所有的位置都是一样的，只是项目名称不一样，这个不用担心。你只需要把我的代码里的包名改成你项目的名称就好了。
注意数据库的连接：要连接的数据库，还有用户名和密码都要和自己的Mysql对应。
package com.example.party.utils;
import java.sql.Connection;
import java.sql.DriverManager;
/**
* function： 数据库工具类，连接数据库用
*/
public class JDBCUtils {
private static final String TAG = "mysql-party-JDBCUtils";
private static String driver = "com.mysql.jdbc.Driver";// MySql驱动
private static String dbName = "party";// 数据库名称
private static String user = "root";// 用户名
private static String password = "";// 密码
public static Connection getConn(){
Connection connection = null;
try{
Class.forName(driver);// 动态加载类
String ip = "10.0.2.2";// 写成本机地址，不能写成localhost，同时手机和电脑连接的网络必须是同一个
// 尝试建立到给定数据库URL的连接
connection = DriverManager.getConnection("jdbc:mysql://" + ip + ":3306/" + dbName,
user, password);
}catch (Exception e){
e.printStackTrace();
}
return connection;
}
} 接着创建entity和User
位置如图，创建方法与上述创建JDBCUtils一样
https://img-blog.csdnimg.cn/059d49f5264440e3aec37fbc8d84e5ca.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
代码如下：
package com.example.party.entity;
public class User {
private int id;
private String userAccount;
private String userPassword;
private String userName;
private int userType;
private int userState;
private int userDel;
public User() {
}
public User(int id, String userAccount, String userPassword, String userName, int userType, int userState, int userDel) {
this.id = id;
this.userAccount = userAccount;
this.userPassword = userPassword;
this.userName = userName;
this.userType = userType;
this.userState = userState;
this.userDel = userDel;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUserAccount() {
return userAccount;
}
public void setUserAccount(String userAccount) {
this.userAccount = userAccount;
}
public String getUserPassword() {
return userPassword;
}
public void setUserPassword(String userPassword) {
this.userPassword = userPassword;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public int getUserType() {
return userType;
}
public void setUserType(int userType) {
this.userType = userType;
}
public int getUserState() {
return userState;
}
public void setUserState(int userState) {
this.userState = userState;
}
public int getUserDel() {
return userDel;
}
public void setUserDel(int userDel) {
this.userDel = userDel;
}
} 之后创建dao和UserDao
https://img-blog.csdnimg.cn/fea11b7f2fde4ee1ac0c76750a7d2677.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
package com.example.party.dao;
import com.example.party.entity.User;
import com.example.party.utils.JDBCUtils;
import android.util.Log;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.HashMap;
/**
* author: yan
* date: 2022.02.17
* **/
public class UserDao {
private static final String TAG = "mysql-party-UserDao";
/**
* function: 登录
* */
public int login(String userAccount, String userPassword){
HashMap<String, Object> map = new HashMap<>();
// 根据数据库名称，建立连接
Connection connection = JDBCUtils.getConn();
int msg = 0;
try {
// mysql简单的查询语句。这里是根据user表的userAccount字段来查询某条记录
String sql = "select * from user where userAccount = ?";
if (connection != null){// connection不为null表示与数据库建立了连接
PreparedStatement ps = connection.prepareStatement(sql);
if (ps != null){
Log.e(TAG,"账号：" + userAccount);
//根据账号进行查询
ps.setString(1, userAccount);
// 执行sql查询语句并返回结果集
ResultSet rs = ps.executeQuery();
int count = rs.getMetaData().getColumnCount();
//将查到的内容储存在map里
while (rs.next()){
// 注意：下标是从1开始的
for (int i = 1;i <= count;i++){
String field = rs.getMetaData().getColumnName(i);
map.put(field, rs.getString(field));
}
}
connection.close();
ps.close();
if (map.size()!=0){
StringBuilder s = new StringBuilder();
//寻找密码是否匹配
for (String key : map.keySet()){
if(key.equals("userPassword")){
if(userPassword.equals(map.get(key))){
msg = 1; //密码正确
}
else
msg = 2; //密码错误
break;
}
}
}else {
Log.e(TAG, "查询结果为空");
msg = 3;
}
}else {
msg = 0;
}
}else {
msg = 0;
}
}catch (Exception e){
e.printStackTrace();
Log.d(TAG, "异常login：" + e.getMessage());
msg = 0;
}
return msg;
}
/**
* function: 注册
* */
public boolean register(User user){
HashMap<String, Object> map = new HashMap<>();
// 根据数据库名称，建立连接
Connection connection = JDBCUtils.getConn();
try {
String sql = "insert into user(userAccount,userPassword,userName,userType,userState,userDel) values (?,?,?,?,?,?)";
if (connection != null){// connection不为null表示与数据库建立了连接
PreparedStatement ps = connection.prepareStatement(sql);
if (ps != null){
//将数据插入数据库
ps.setString(1,user.getUserAccount());
ps.setString(2,user.getUserPassword());
ps.setString(3,user.getUserName());
ps.setInt(4,user.getUserType());
ps.setInt(5, user.getUserState());
ps.setInt(6,user.getUserDel());
// 执行sql查询语句并返回结果集
int rs = ps.executeUpdate();
if(rs>0)
return true;
else
return false;
}else {
returnfalse;
}
}else {
returnfalse;
}
}catch (Exception e){
e.printStackTrace();
Log.e(TAG, "异常register：" + e.getMessage());
return false;
}
}
/**
* function: 根据账号进行查找该用户是否存在
* */
public User findUser(String userAccount) {
// 根据数据库名称，建立连接
Connection connection = JDBCUtils.getConn();
User user = null;
try {
String sql = "select * from user where userAccount = ?";
if (connection != null){// connection不为null表示与数据库建立了连接
PreparedStatement ps = connection.prepareStatement(sql);
if (ps != null) {
ps.setString(1, userAccount);
ResultSet rs = ps.executeQuery();
while (rs.next()) {
//注意：下标是从1开始
int id = rs.getInt(1);
String userAccount1 = rs.getString(2);
String userPassword = rs.getString(3);
String userName = rs.getString(4);
int userType = rs.getInt(5);
int userState = rs.getInt(6);
int userDel = rs.getInt(7);
user = new User(id, userAccount1, userPassword, userName, userType, userState, userDel);
}
}
}
}catch (Exception e){
e.printStackTrace();
Log.d(TAG, "异常findUser：" + e.getMessage());
return null;
}
return user;
}
} 编写登录页面
https://img-blog.csdnimg.cn/49a85d6140394f318488849e584f15cc.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
<?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/uesrAccount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:inputType="phone"
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/userPassword"
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="登录"
android:onClick="login"
/>
<Button
android:id="@+id/button3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="reg"
android:text="注册" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout> 效果如图：
https://img-blog.csdnimg.cn/4258060208384940852a0308d6ae50e7.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
完善MainActivity
https://img-blog.csdnimg.cn/2f845dd7311a475f9dce8cdb61af9b7c.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
package com.example.party;
import androidx.appcompat.app.AppCompatActivity;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import com.example.party.dao.UserDao;
/**
* function：连接页面加载首页
*/
public class MainActivity extends AppCompatActivity {
private static final String TAG = "mysql-party-MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void reg(View view){
startActivity(new Intent(getApplicationContext(),register.class));
}
/**
* function: 登录
* */
public void login(View view){
EditText EditTextAccount = findViewById(R.id.uesrAccount);
EditText EditTextPassword = findViewById(R.id.userPassword);
new Thread(){
@Override
public void run() {
UserDao userDao = new UserDao();
int msg = userDao.login(EditTextAccount.getText().toString(),EditTextPassword.getText().toString());
hand1.sendEmptyMessage(msg);
}
}.start();
}
@SuppressLint("HandlerLeak")
final Handler hand1 = new Handler() {
@Override
public void handleMessage(Message msg) {
if (msg.what == 0){
Toast.makeText(getApplicationContext(), "登录失败", Toast.LENGTH_LONG).show();
} else if (msg.what == 1) {
Toast.makeText(getApplicationContext(), "登录成功", Toast.LENGTH_LONG).show();
} else if (msg.what == 2){
Toast.makeText(getApplicationContext(), "密码错误", Toast.LENGTH_LONG).show();
} else if (msg.what == 3){
Toast.makeText(getApplicationContext(), "账号不存在", Toast.LENGTH_LONG).show();
}
}
};
} 编写注册页面
https://img-blog.csdnimg.cn/679e7ef6791d4b5e99f8f1e6a7cf5097.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
https://img-blog.csdnimg.cn/0494717439584c95ba1931c601e56602.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
https://img-blog.csdnimg.cn/129d38628874478fbcc2c7a740f96ab4.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
<?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/uesrAccount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10"
android:inputType="phone"
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/userPassword"
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="登录"
android:onClick="login"
/>
<Button
android:id="@+id/button3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="reg"
android:text="注册" />
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout> 页面如图
https://img-blog.csdnimg.cn/979cfcbbb2764ce3be28d5172e22db26.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_11,color_FFFFFF,t_70,g_se,x_16
完善register
上一步创建activity_register.xml的时候会自动生成一个Class，位置如图，如果没有的话自己右键创建一个Class就可以。
https://img-blog.csdnimg.cn/356ad6c4bd8a4a719b64822aa388eb19.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
package com.example.party;
import androidx.appcompat.app.AppCompatActivity;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import com.example.party.dao.UserDao;
import com.example.party.entity.User;
/**
* function：连接注册页面
*/
public class register extends AppCompatActivity {
private static final String TAG = "mysql-party-register";
EditText userAccount = null;
EditText userPassword = null;
EditText userName = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
userAccount = findViewById(R.id.userAccount);
userPassword = findViewById(R.id.userPassword);
userName = findViewById(R.id.userName);
}
public void register(View view){
String userAccount1 = userAccount.getText().toString();
String userPassword1 = userPassword.getText().toString();
String userName1 = userName.getText().toString();
User user = new User();
user.setUserAccount(userAccount1);
user.setUserPassword(userPassword1);
user.setUserName(userName1);
user.setUserType(1);
user.setUserState(0);
user.setUserDel(0);
new Thread(){
@Override
public void run() {
int msg = 0;
UserDao userDao = new UserDao();
User uu = userDao.findUser(user.getUserAccount());
if(uu != null){
msg = 1;
}
else{
boolean flag = userDao.register(user);
if(flag){
msg = 2;
}
}
hand.sendEmptyMessage(msg);
}
}.start();
}
@SuppressLint("HandlerLeak")
final Handler hand = new Handler()
{
public void handleMessage(Message msg) {
if(msg.what == 0) {
Toast.makeText(getApplicationContext(),"注册失败",Toast.LENGTH_LONG).show();
} else if(msg.what == 1) {
Toast.makeText(getApplicationContext(),"该账号已经存在，请换一个账号",Toast.LENGTH_LONG).show();
} else if(msg.what == 2) {
Toast.makeText(getApplicationContext(), "注册成功", Toast.LENGTH_LONG).show();
Intent intent = new Intent();
//将想要传递的数据用putExtra封装在intent中
intent.putExtra("a","注册");
setResult(RESULT_CANCELED,intent);
finish();
}
}
};
} 下面汇总一下都需要改变的文件！
https://img-blog.csdnimg.cn/30131c3bbc3840dbb473cbad1b317961.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_20,color_FFFFFF,t_70,g_se,x_16
https://img-blog.csdnimg.cn/8e70e701c50b485d951168e871f1de13.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBAY2hhbmd5YW5h,size_19,color_FFFFFF,t_70,g_se,x_16
然后运行就可以啦！
心得建议
我的大部分时间感觉都是花费在了连接数据库上。刚开始数据库一直连接无法连接，原因是连接的请求要放在一个新的线程里，不能直接在当前线程请求连接数据库。之后解决了连接问题后得到数据进行匹配都是比较简单的事情。
个人建议：如果出问题可以先建一个临时的项目然后按照【连接数据库】–> 【请求数据并在控制台输出】 --> 【建立前端页面交互】这样的过程一步一步进行调试。
祝成功！
来源：https://blog.csdn.net/changyana/article/details/122950467
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