Emailsender

This tutorial will show you how to send a email via Spring framework’s email support. The Spring Framework provides a helpful utility library for sending email that shields the user from the specifics of the underlying mailing system and is responsible for low level resource handling on behalf of the client.The org.springframework.mail.javamail.JavaMailSender interface adds specialized JavaMail features such as MIME message support to the MailSender interface (from which it inherits).JavaMailSender also provides a callback interface for preparation of JavaMail MIME messages, called org.springframework.mail.javamail.MimeMessagePreparator.PrerequisitesEclipse 2019-12, Java at least 1.8, Gradle 6.4.1, Maven 3.6.3, Spring Boot Mail Starter 2.3.1, Java mail API 1.6.2Project SetupCreate either gradle or maven based project in Eclipse. The name of the project is spring-email-javamailsender-and-mimemessagepreparator.If you are creating gradle based project then you can use below build.gradle script:buildscript { ext { springBootVersion = '2.3.1.RELEASE' } repositories { mavenCentral() } dependencies { classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}") }}plugins { id 'java-library' id 'org.springframework.boot' version "${springBootVersion}"}sourceCompatibility = 12targetCompatibility = 12repositories { mavenCentral()}dependencies { implementation("org.springframework.boot:spring-boot-starter-mail:${springBootVersion}") implementation('javax.mail:javax.mail-api:1.6.2')}If you are creating maven based project then you can use below pom.xml file: 4.0.0 com.roytuts spring-email-javamailsender-and-mimemessagepreparator 0.0.1-SNAPSHOT org.springframework.boot spring-boot-starter-parent 2.3.1.RELEASE UTF-8 org.springframework.boot spring-boot-starter-mail javax.mail javax.mail-api 1.6.2 org.apache.maven.plugins maven-compiler-plugin 3.8.1 at least 8 at least 8 Email ConfigurationWe will create an email configuration class where we will configure SMTP (Simple Mail Transfer Protocol) server details, from email address.package com.roytuts.spring.email.javamailsender.and.mimemessagepreparator;import java.util.Properties;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.mail.javamail.JavaMailSender;import org.springframework.mail.javamail.JavaMailSenderImpl;@Configurationpublic class EmailConfig { @Bean public JavaMailSender mailSender() { JavaMailSenderImpl mailSender = new JavaMailSenderImpl(); mailSender.setHost("smtp.gmail.com"); mailSender.setPort(587); mailSender.setUsername("[email protected]"); mailSender.setPassword("gmail password"); Properties javaMailProperties = new Properties(); javaMailProperties.put("mail.smtp.auth", true); javaMailProperties.put("mail.smtp.starttls.enable", true); mailSender.setJavaMailProperties(javaMailProperties); return mailSender; }}We need to issue STARTTLS command otherwise you will get the error message similar to the following:#smtplib.SMTPSenderRefused: (530, b'5.7.0 Must issue a STARTTLS command first. p7sm24605501pfn.14 - gsmtp', '[email protected]')You will get below error if your security level is high:#smtplib.SMTPAuthenticationError: (535, b'5.7.8 Username and Password not accepted. Learn more at\n5.7.8 x10sm26098036pfn.36 - gsmtp')Therefore you need to lower your Gmail’s security settings.Email SenderEmail sender class just does the right job for sending the email to the intended recipient.package com.roytuts.spring.email.javamailsender.and.mimemessagepreparator;import javax.mail.Message;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.mail.javamail.JavaMailSender;import org.springframework.mail.javamail.MimeMessagePreparator;import org.springframework.stereotype.Component;@Componentpublic class EmailSender { @Autowired private JavaMailSender mailSender; public void sendEmail(final String subject, final String message, final String fromEmailAddress, final String toEmailAddresses) { MimeMessagePreparator preparator = new MimeMessagePreparator() { public void prepare(MimeMessage mimeMessage) throws Exception { mimeMessage.setRecipient(Message.RecipientType.TO, new InternetAddress(toEmailAddresses)); mimeMessage.setFrom(new InternetAddress(fromEmailAddress)); mimeMessage.setSubject(subject); mimeMessage.setText(message); } }; try { mailSender.send(preparator); System.out.println("Email sending complete."); } catch (Exception e) { e.printStackTrace(); } }}Main ClassA class is having main method with @SpringBootApplication annotation is enough to start up the Spring Boot application.In this class we specify the subject, message and the recipient to send the email.package com.roytuts.spring.email.javamailsender.and.mimemessagepreparator;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.CommandLineRunner;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class MimeMessagePreparatorApp implements CommandLineRunner { @Autowired private EmailSender emailSender; public static void main(String[] args) { SpringApplication.run(MimeMessagePreparatorApp.class, args);

Public void setTo(String to) { this.to = to; } public String getSubject() { return subject; } public void setSubject(String subject) { this.subject = subject; } public String getContent() { return content; } public void setContent(String content) { this.content = content; } @Override public String toString() { return "Mail{" + "from='" + from + ''' + ", to='" + to + ''' + ", subject='" + subject + ''' + ", content='" + content + ''' + '}'; }}Creating Email Service SenderNow lets create a service that’ll be responsible for sending the emails out. We have created a method called sendSimpleMessage() which takes a Mail argument. First we create a SimpleMailMessage and assign the properties of the Mail object to it. Next, we use the JavaMailSender which Spring Boot automatically Initialized with the properties found in the above configuration files.package com.memorynotfound.mail;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.mail.SimpleMailMessage;import org.springframework.mail.javamail.JavaMailSender;import org.springframework.stereotype.Service;@Servicepublic class EmailService { @Autowired private JavaMailSender emailSender; public void sendSimpleMessage(final Mail mail){ SimpleMailMessage message = new SimpleMailMessage(); message.setSubject(mail.getSubject()); message.setText(mail.getContent()); message.setTo(mail.getTo()); message.setFrom(mail.getFrom()); emailSender.send(message); }}Spring Mail – Sending Simple Email with JavaMailSender ExampleWe are using Spring Boot to bootstrap our application. When the application is invoked we simply create a new Mail object and send it using our previously created EmailServicepackage com.memorynotfound.mail;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.ApplicationArguments;import org.springframework.boot.ApplicationRunner;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class Application implements ApplicationRunner { private static Logger log = LoggerFactory.getLogger(Application.class); @Autowired private EmailService emailService; public static void main(String[] args) throws Exception { SpringApplication.run(Application.class, args); } @Override public void run(ApplicationArguments applicationArguments) throws Exception { log.info("Spring Mail - Sending Simple

Blazor Server Identity Provider with ASP.NET Core Identity using OpenIddictBased on official microsoft documentation for ASP.NET Core Identity.In this sample we will be using:Blazor ServerASP.NET Core IdentitySQLiteOpenIddict CoreOpenIddict SamplesSteps to run through this sample/tutorialCreate the solution filedotnet new sln -n BlazorIdentityCreate and add a clean blazor server projectdotnet new blazorserver -n BlazorIdentity.Serverdotnet sln add BlazorIdentity.ServerAdd dependencies to the projectInstall the tools used in this sample:dotnet tool install -g dotnet-efdotnet tool install -g dotnet-aspnet-codegeneratorAdd the packages:dotnet add package Microsoft.AspNetCore.Diagnostics.EntityFrameworkCoredotnet add package Microsoft.AspNetCore.Identity.EntityFrameworkCoredotnet add package Microsoft.AspNetCore.Identity.UIdotnet add package Microsoft.EntityFrameworkCore.Designdotnet add package Microsoft.EntityFrameworkCore.Sqlitedotnet add package Microsoft.EntityFrameworkCore.Toolsdotnet add package Microsoft.VisualStudio.Web.CodeGeneration.Designdotnet add package OpenIddict.AspNetCore -v 3.0.0-beta5.20503.76dotnet add package OpenIddict.EntityFrameworkCore -v 3.0.0-beta5.20503.76Create the Database contextCreate an ApplicationUser class in /Models:public class ApplicationUser : IdentityUser{}Create the DbContext class in /Data:{ public AppDbContext(DbContextOptions options) : base(options) { }}">public class AppDbContext : IdentityDbContextApplicationUser>{ public AppDbContext(DbContextOptionsAppDbContext> options) : base(options) { }}Setup other required classesCreate /Services/EmailSender.cs:public class EmailSender : IEmailSender{ public Task SendEmailAsync(string email, string subject, string htmlMessage) { return Task.CompletedTask; }}Add to Startup.cs, ConfigureServices method:(options =>{ // Configure the context to use SQLite. options.UseSqlite(Configuration.GetConnectionString("AppDbContextConnection")); // Register the entity sets needed by OpenIddict. // Note: use the generic overload if you need // to replace the default OpenIddict entities. options.UseOpenIddict();});services.AddIdentity(options =>{ options.Password.RequireNonAlphanumeric = false; options.Password.RequireUppercase = false; // Add more password requirements ...}) .AddEntityFrameworkStores() .AddDefaultTokenProviders();// Configure Identity to use the same JWT claims as OpenIddict instead// of the legacy WS-Federation claims it uses by default (ClaimTypes),// which saves you from doing the mapping in your authorization controller.services.Configure(options =>{ options.ClaimsIdentity.UserNameClaimType = Claims.Name; options.ClaimsIdentity.UserIdClaimType = Claims.Subject; options.ClaimsIdentity.RoleClaimType = Claims.Role;});services.AddOpenIddict() // Register the OpenIddict core components. .AddCore(options => { // Configure OpenIddict to use the Entity Framework Core stores and models. // Note: call ReplaceDefaultEntities() to replace the default OpenIddict entities. options.UseEntityFrameworkCore() .UseDbContext(); }) // Register the OpenIddict server components. .AddServer(options => { //

Need to support implicit, password or client credentials. options.AllowAuthorizationCodeFlow() .AllowRefreshTokenFlow(); // Register the signing and encryption credentials. options.AddDevelopmentEncryptionCertificate() .AddDevelopmentSigningCertificate(); // Register the ASP.NET Core host and configure the ASP.NET Core-specific options. options.UseAspNetCore() .EnableAuthorizationEndpointPassthrough() .EnableLogoutEndpointPassthrough() .EnableStatusCodePagesIntegration() .EnableTokenEndpointPassthrough(); }) // Register the OpenIddict validation components. .AddValidation(options => { // Import the configuration from the local OpenIddict server instance. options.UseLocalServer(); // Register the ASP.NET Core host. options.UseAspNetCore(); });// Add our custom Email Senderservices.AddSingletonIEmailSender, EmailSender>();Add to Startup.cs, Configure method:{ endpoints.MapRazorPages(); endpoints.MapControllers(); endpoints.MapBlazorHub(); // Enable For Blazor Server only endpoints.MapFallbackToPage("/_Host"); // Enable For Blazor Server only});">app.UseAuthentication();app.UseAuthorization();app.UseEndpoints(endpoints =>{ endpoints.MapRazorPages(); endpoints.MapControllers(); endpoints.MapBlazorHub(); // Enable For Blazor Server only endpoints.MapFallbackToPage("/_Host"); // Enable For Blazor Server only});Set up the database (Sqlite)Create an initial migration and run it:dotnet ef migrations add InitialSchema -o "Data/Migrations"dotnet ef database updateScaffold all the Identity filesUse for only these pages:dotnet aspnet-codegenerator identity -dc BlazorIdentity.Server.Data.AppDbContext -sqlite --files "Account.Register;Account.Login;Account.Logout;Account.ResetPassword"Use to scaffold ALL Identity pages:dotnet aspnet-codegenerator identity -dc BlazorIdentity.Server.Data.AppDbContext -sqliteApply --force to regenerate.First Test !Open the url to check your OpenID specification: continue!Create a redirect componentCreate component /Shared/RedirectToLogin.cs:public class RedirectToLogin : ComponentBase{ [Inject] NavigationManager NavigationManager { get; set; } protected override void OnInitialized() { NavigationManager.NavigateTo($"Identity/Account/Login?returnUrl={Uri.EscapeDataString(NavigationManager.Uri)}", true); }}Create a login display component in /Shared/LoginDisplay.razor: Hello, @context.User.Identity.Name! Logout Login ">@using Microsoft.AspNetCore.Components.Authorization @inject NavigationManagerNavigationAuthorizeView> Authorized> a href="Identity/Account/Manage/Index"> Hello, @context.User.Identity.Name! a> form action="/Identity/Account/Logout?returnUrl=%2F" method="post"> button class="nav-link btn btn-link" type="submit">Logoutbutton> form> Authorized> NotAuthorized> a href="Identity/Account/Login">Logina> NotAuthorized>AuthorizeView>Add the Login Display to MainLayout.razor: About">div class="top-row px-4"> LoginDisplay /> a href=" target="_blank">Abouta>div>