Android studio 自带的 LoginActivity 连接MySQL 实现登录功能
16lz
2021-01-23
用Android studio自带的 LoginActivity连接MySQL实现登录功能
连接MySQL
import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;class DBLogin { private static final String driver = "com.mysql.jdbc.Driver"; private static final String url = "jdbc:mysql://192.168.1.6:3306/libraryDB"; private static final String user = "phill"; private static final String pwd = "123456"; private static Connection conn=null; private static int jumper=111; static void linkMysql(){ try { Class.forName("com.mysql.jdbc.Driver"); System.out.println("驱动加载成功！"); } catch (Exception e){ e.printStackTrace(); } try { conn=DriverManager.getConnection(url, user, pwd); System.out.println("连接数据库成功！"); } catch (Exception e){ e.printStackTrace(); } } static void linkLoginsql(String username, String password) { try { String logSql = "Select * from WR_user where phoneNum='"+ username+ "'and Upassword='"+ password+ "'"; PreparedStatement stmt = conn.prepareStatement(logSql); ResultSet rs = stmt.executeQuery(logSql); // 获取跳转判断 if(rs.next()){ jumper=233; userid=rs.getInt("userid"); nickname=rs.getString("nickname"); }else{ jumper=777; } System.out.println(jumper); rs.close(); stmt.close(); } catch (Exception e){ e.printStackTrace(); } //关闭数据库 if(conn!=null){ try { conn.close(); }catch (Exception e){ e.printStackTrace(); } } } //传递跳转判断 static int getjumper(){ return jumper; } //传递用户ID public static int getuserid(){ return userid; } //传递用户昵称 public static String getnickname(){ return nickname; }}修改LoginActivity
loginViewModel.getLoginResult().observe(this, new Observer<LoginResult>() { @Override public void onChanged(@Nullable LoginResult loginResult) { if (loginResult == null) { return; } loadingProgressBar.setVisibility(View.GONE); System.out.println(loginResult.getError()); if (loginResult.getError() != null) { showLoginFailed(loginResult.getError()); } if (loginResult.getSuccess() != null) { //此处添加登录跳转 Intent intent = new Intent(LoginActivity.this, MainBody.class); LoginActivity.this.startActivity(intent); updateUiWithUser(loginResult.getSuccess()); } setResult(Activity.RESULT_OK); //Complete and destroy login activity once successful finish(); }});/*设置点击事件*/loginButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //在线程中调用数据库 Thread t1 = new Thread(new Runnable() { public void run() { DBLogin.linkLoginsql(usernameEditText.getText().toString(),passwordEditText.getText().toString()); } }); t1.start(); //在数据库连接完成之前暂停其他活动 try { t1.join(); } catch (InterruptedException e) { e.printStackTrace(); } loadingProgressBar.setVisibility(View.VISIBLE); loginViewModel.login(usernameEditText.getText().toString(),passwordEditText.getText().toString()); }});修改LoginViewModel
//更改判断条件public void login(String username, String password) { // can be launched in a separate asynchronous job Result<LoggedInUser> result = loginRepository.login(username, password); if (DBLogin.getjumper() == 233) { LoggedInUser data = ((Result.Success<LoggedInUser>) result).getData(); loginResult.setValue(new LoginResult(new LoggedInUserView(data.getDisplayName()))); } else { loginResult.setValue(new LoginResult(R.string.login_failed)); } }修改data文件LoginDataSource
public class LoginDataSource { public Result<LoggedInUser> login(String username, String password) { try { // TODO: handle loggedInUser authentication LoggedInUser fakeUser = new LoggedInUser( //修改显示的用户昵称 java.util.UUID.randomUUID().toString(),DBLogin.getnickname()); return new Result.Success<>(fakeUser); } catch (Exception e) { return new Result.Error(new IOException("Error logging in", e)); } } public void logout() { // TODO: revoke authentication }}更多相关文章
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