Angular + Spring 文件上传示例

2025年3月25日 | 阅读 9 分钟

在本节中，我们将创建一个文件上传 Web 应用程序。此应用程序包含一个注册表单。在此集成中，我们使用 Spring 处理后端部分，并使用 Angular 处理前端部分。

应用程序的工作方式

一旦我们将应用程序部署到服务器上，就会生成一个注册页面。
用户可以填写所需的信息并上传图像。
请记住，图像大小不得超过 1 MB。

要使用的工具

使用任何 IDE 开发 Spring 和 Hibernate 项目。它可以是 MyEclipse/Eclipse/Netbeans。在这里，我们使用 Eclipse。
MySQL 用于数据库。
使用任何 IDE 开发 Angular 项目。它可以是 Visual Studio Code/Sublime。在这里，我们使用 Visual Studio Code。
服务器：Apache Tomcat/JBoss/Glassfish/Weblogic/Websphere。

我们使用的技术

在这里，我们使用以下技术

Spring 5
Hibernate 5
Angular 6
MYSQL

创建数据库

让我们创建一个数据库 fileuploadexample。无需创建表，因为 Hibernate 会自动创建它。

Spring 模块

让我们看看我们需要遵循的 Spring 目录结构

要开发文件上传应用程序，请按照以下步骤操作：-

将依赖项添加到 pom.xml 文件中。

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.javatpoint</groupId>
  <artifactId>FileUploadExample</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>FileUploadExample Maven Webapp</name>
  <url>http://maven.apache.org</url>
  
  <properties>
		<springframework.version>5.0.6.RELEASE</springframework.version>
		<hibernate.version>5.2.16.Final</hibernate.version>
		<mysql.connector.version>5.1.45</mysql.connector.version>
		<c3po.version>0.9.5.2</c3po.version>

		<maven.compiler.source>1.8</maven.compiler.source>
		<maven.compiler.target>1.8</maven.compiler.target>
	</properties>
	
	
  <dependencies>
  
   <!-- Spring -->
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-webmvc</artifactId>
		<version>${springframework.version}</version>
	</dependency>

	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-tx</artifactId>
		<version>${springframework.version}</version>
	</dependency>
		
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-orm</artifactId>
		<version>${springframework.version}</version>
	</dependency>

	<!-- Add Jackson for JSON converters -->
	<dependency>
		<groupId>com.fasterxml.jackson.core</groupId>
		<artifactId>jackson-databind</artifactId>
		<version>2.9.5</version>
	</dependency>

	<!-- Hibernate -->
	<dependency>
		<groupId>org.hibernate</groupId>
		<artifactId>hibernate-core</artifactId>
		<version>${hibernate.version}</version>
	</dependency>

	<!-- MySQL -->
	<dependency>
		<groupId>mysql</groupId>
		<artifactId>mysql-connector-java</artifactId>
		<version>${mysql.connector.version}</version>
	</dependency>

	<!-- C3PO -->
	<dependency>
		<groupId>com.mchange</groupId>
		<artifactId>c3p0</artifactId>
		<version>${c3po.version}</version>
	</dependency>

	<!-- Servlet+JSP+JSTL -->
	<dependency>
		<groupId>javax.servlet</groupId>
		<artifactId>javax.servlet-api</artifactId>
		<version>3.1.0</version>
	</dependency>

	<dependency>
		<groupId>javax.servlet.jsp</groupId>
		<artifactId>javax.servlet.jsp-api</artifactId>
		<version>2.3.1</version>
	</dependency>

	<dependency>
		<groupId>javax.servlet</groupId>
		<artifactId>jstl</artifactId>
		<version>1.2</version>
	</dependency>


	<!-- to compensate for java 9 not including jaxb -->
	<dependency>
		<groupId>javax.xml.bind</groupId>
		<artifactId>jaxb-api</artifactId>
		<version>2.3.0</version>
	</dependency>
 	
 	<!--  JUnit dependency -->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>3.8.1</version>
        <scope>test</scope>
    </dependency>
    
         <!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
	<dependency>
	    <groupId>commons-fileupload</groupId>
	    <artifactId>commons-fileupload</artifactId>
	    <version>1.3</version>
	</dependency>
	
	<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-dbcp2 -->
	<dependency>
	    <groupId>org.apache.commons</groupId>
	    <artifactId>commons-dbcp2</artifactId>
	    <version>2.0</version>
	</dependency> 
    
    
    
  </dependencies>
  <build>
    <finalName>FileUploadExample</finalName>
  </build>
</project>

创建配置类
我们使用基于注解的配置而不是 XML。因此，我们创建两个类并在其中指定所需的配置。

DemoAppConfig.java

package com.javatpoint.FileUploadExample.config;

import java.beans.PropertyVetoException;
import java.io.IOException;
import java.util.Properties;
import javax.sql.DataSource;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
import org.springframework.orm.hibernate5.HibernateTransactionManager;
import org.springframework.orm.hibernate5.LocalSessionFactoryBean;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;

import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import com.mchange.v2.c3p0.ComboPooledDataSource;

@Configuration
@EnableWebMvc
@EnableTransactionManagement
@ComponentScan("com.javatpoint.FileUploadExample")
@PropertySource(value = { "classpath:persistence-mysql.properties" })
@PropertySource(value = { "classpath:persistence-mysql.properties" })
@PropertySource(value = { "classpath:application.properties" })
public class DemoAppConfig implements WebMvcConfigurer {
	
	@Autowired
	private Environment env;
	
	@Bean
	public DataSource myDataSource() {
		
		// create connection pool
		ComboPooledDataSource myDataSource = new ComboPooledDataSource();

		// set the jdbc driver
		try {
			myDataSource.setDriverClass("com.mysql.jdbc.Driver");		
		}
		catch (PropertyVetoException exc) {
			throw new RuntimeException(exc);
		}
		
		// set database connection props
		myDataSource.setJdbcUrl(env.getProperty("jdbc.url"));
		myDataSource.setUser(env.getProperty("jdbc.user"));
		myDataSource.setPassword(env.getProperty("jdbc.password"));
		
		// set connection pool props
		myDataSource.setInitialPoolSize(getIntProperty("connection.pool.initialPoolSize"));
		myDataSource.setMinPoolSize(getIntProperty("connection.pool.minPoolSize"));
		myDataSource.setMaxPoolSize(getIntProperty("connection.pool.maxPoolSize"));		
		myDataSource.setMaxIdleTime(getIntProperty("connection.pool.maxIdleTime"));

		return myDataSource;
	}
	
	private Properties getHibernateProperties() {

		// set hibernate properties
		Properties props = new Properties();
		props.setProperty("hibernate.dialect", env.getProperty("hibernate.dialect"));
		props.setProperty("hibernate.show_sql", env.getProperty("hibernate.show_sql"));
		props.setProperty("hibernate.format_sql", env.getProperty("hibernate.format_sql"));
		props.setProperty("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl"));
		return props;				
	}

	
	// need a helper method 
	// read environment property and convert to int
	
	private int getIntProperty(String propName) {
		
		String propVal = env.getProperty(propName);
		
		// now convert to int
		int intPropVal = Integer.parseInt(propVal);
		return intPropVal;
	}	
	
	@Bean
	public LocalSessionFactoryBean sessionFactory(){
		
		// create session factorys
		LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
		
		// set the properties
		sessionFactory.setDataSource(myDataSource());
		sessionFactory.setPackagesToScan(env.getProperty("hibernate.packagesToScan"));
		sessionFactory.setHibernateProperties(getHibernateProperties());
		
		return sessionFactory;
	}
	
	@Bean
	@Autowired
	public HibernateTransactionManager transactionManager(SessionFactory sessionFactory) {
		
		// setup transaction manager based on session factory
		HibernateTransactionManager txManager = new HibernateTransactionManager();
		txManager.setSessionFactory(sessionFactory);

		return txManager;
	}	
	
	@Bean(name="multipartResolver")
    public CommonsMultipartResolver getResolver() throws IOException{
        CommonsMultipartResolver resolver = new CommonsMultipartResolver();
         
        //Set the maximum allowed size (in bytes) for each individual file.
       // resolver.setMaxUploadSize(5242880);//5MB
        
        resolver.setMaxUploadSize(524288);//0.5MB
        
        //You may also set other available properties.  
        return resolver;
    }
	
}

MySpringMvcDispatcherServletInitializer.java

package com.javatpoint.FileUploadExample.config;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class MySpringMvcDispatcherServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

	@Override
	protected Class<?>[] getRootConfigClasses() {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	protected Class<?>[] getServletConfigClasses() {
		return new Class[] { DemoAppConfig.class };
	}

	@Override
	protected String[] getServletMappings() {
		return new String[] { "/" };
	}

}

创建实体类
在这里，我们正在创建一个 Entity/POJO（Plain Old Java Object）类。

UserDetail.java

package com.javatpoint.FileUploadExample.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="user_detail")
public class UserDetail {
	
	@Id
	@GeneratedValue(strategy=GenerationType.AUTO)
	@Column(name="user_id")
	private int userId;
	
	@Column(name="email_id")
	public String emailId;
	
	@Column(name="name")
	public String name;
	
	@Column(name="profile_image")
	public String profileImage;
	
	public UserDetail() { }

	public UserDetail(int userId, String emailId, String name, String profileImage) {
		super();
		this.userId = userId;
		this.emailId = emailId;
		this.name = name;
		this.profileImage = profileImage;
	}

	public int getUserId() {
		return userId;
	}

	public void setUserId(int userId) {
		this.userId = userId;
	}

	public String getEmailId() {
		return emailId;
	}

	public void setEmailId(String emailId) {
		this.emailId = emailId;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getProfileImage() {
		return profileImage;
	}

	public void setProfileImage(String profileImage) {
		this.profileImage = profileImage;
	}

	@Override
	public String toString() {
		return "UserDetail [userId=" + userId + ", emailId=" + emailId + ", name=" + name + ", profileImage="
				+ profileImage + "]";
	}

	
}

创建 DAO 接口
在这里，我们正在创建一个 DAO 接口来执行数据库相关操作。

UserDAO.java

package com.javatpoint.FileUploadExample.DAO.interfaces;

import com.javatpoint.FileUploadExample.entity.UserDetail;

public interface UserDAO {
	
	public int saveUser(UserDetail userDetail);
	
	public UserDetail getUserDetail(int userId);
	
	public int updateProfileImage(String profileImage , int userID);
	
}

创建 DAO 接口实现类

UserDAOImpl.java

package com.javatpoint.FileUploadExample.DAO.implementation;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.query.Query;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.javatpoint.FileUploadExample.DAO.interfaces.UserDAO;
import com.javatpoint.FileUploadExample.entity.UserDetail;

@Repository("userDAO")
public class UserDAOImpl implements UserDAO {

	@Autowired
	SessionFactory sessionFactory;
	
	public int saveUser(UserDetail userDetail) {
		
		Session session = null;
		try
		{
			session = sessionFactory.getCurrentSession();
			int status = (Integer) session.save(userDetail);
			return status;
		}
		catch(Exception exception)
		{
			System.out.println("Exception in saving data into the database" + exception);
			return 0;
		}
		finally
		{
			session.flush();
		}
	}

	public UserDetail getUserDetail(int userId) {
		Session session = null;
		try
		{
			session = sessionFactory.getCurrentSession();
			UserDetail userDetail = session.get(UserDetail.class, userId);
			return userDetail;
		}
		catch(Exception exception)
		{
			System.out.println("Exception in saving data into the database " + exception);
			return null;
		}
		finally
		{
			session.flush();
		}
	}

	public int updateProfileImage(String profileImage, int userID) {
		Session session= sessionFactory.getCurrentSession();
		int result;
		
		try
		{
			Query<UserDetail> query = session.createQuery("update UserDetail set profileImage = :profileImage where userId=:userID ");
			query.setParameter("profileImage", profileImage);
			query.setParameter("userID", userID);
			result = query.executeUpdate();
			if(result > 0)
			{
				return result;
			}
			else return -5;
		}
		catch(Exception exception)
		{
			System.out.println("Error while updating profileImage from DAO :: " + exception.getMessage());
			return -5;
		}
		finally
		{
			session.flush();
		}
		
		
	}
}

创建服务层接口

在这里，我们正在创建一个服务层接口，它充当 DAO 和实体类之间的桥梁。

UserService.java

package com.javatpoint.FileUploadExample.service.interfaces;

import javax.servlet.http.HttpSession;

import org.springframework.web.multipart.MultipartFile;

import com.javatpoint.FileUploadExample.entity.UserDetail;

public interface UserService {
	
	public int saveUser(UserDetail userDetail);
	
	public UserDetail getUserDetail(int userId);
	
	public int store(MultipartFile file, int userID ,  HttpSession session);
	
}

创建服务层实现类

UserServiceImpl.java

package com.javatpoint.FileUploadExample.service.implementation;

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import javax.servlet.http.HttpSession;
import javax.transaction.Transactional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import com.javatpoint.FileUploadExample.DAO.interfaces.UserDAO;
import com.javatpoint.FileUploadExample.entity.UserDetail;
import com.javatpoint.FileUploadExample.service.interfaces.UserService;

@Service("userService")
public class UserServiceImpl implements UserService {

	@Autowired
	private UserDAO userDAO;
	
	@Transactional
	public int saveUser(UserDetail userDetail) {
		return userDAO.saveUser(userDetail);
	}
	
	@Transactional
	public UserDetail getUserDetail(int userId) {
		return userDAO.getUserDetail(userId);
	}

	@Transactional
	public int store(MultipartFile file, int userID, HttpSession session) {
		
		Path rootLocation = Paths.get(session.getServletContext().getRealPath("/resources/images"));
		
		System.out.println("rootLocation  ==  " + rootLocation);
		
		UserDetail userDetail = this.getUserDetail(userID);
		 
		 String nameExtension[] = file.getContentType().split("/");

		 String profileImage = userID + "." + nameExtension[1];
		 	
		 System.out.println("ProfileImage  :: " + profileImage);
		 
		 if(userDetail.getUserId() > 0 )
		 {
			 
			if(userDetail.getProfileImage() == null || userDetail.getProfileImage() == " " || userDetail.getProfileImage() == "" )
			{
				try
				{
					Files.copy(file.getInputStream(),rootLocation.resolve(profileImage));
					int result = userDAO.updateProfileImage(profileImage, userID);	
					if(result > 0)
						return result;
					else
						return -5;
				}
				catch(Exception exception)
				{
					System.out.println("error while uploading image catch:: " + exception.getMessage());
					return -5;
				}
			}
			else
			{
				try
				{
					//Files.delete(rootLocation.resolve(profileImage));
					
					Files.delete(rootLocation.resolve(userDetail.getProfileImage()));
					
					Files.copy(file.getInputStream(),rootLocation.resolve(profileImage));
					int result = userDAO.updateProfileImage(profileImage, userID);	
					if(result > 0)
						return result;
					else
						return -5;
				}
				catch(Exception exception)
				{
					System.out.println("Error while uploading image when image is already Exists :: " + exception.getMessage());
					return -5;
				}
			}
		}
		else {
			return 0;
		}
	}

	

}

创建控制器类

UserController.java

package com.javatpoint.FileUploadExample.restController;

import javax.servlet.http.HttpSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import com.javatpoint.FileUploadExample.entity.UserDetail;
import com.javatpoint.FileUploadExample.service.interfaces.UserService;

@RestController
@RequestMapping("/api")
@CrossOrigin(origins = "https://:4200", allowedHeaders = "*")
public class UserController {
	
	@Autowired
	private UserService userService;
	
	@PostMapping("/saveUser")
	public int saveUser(@RequestBody UserDetail userDetail)
	{
		return userService.saveUser(userDetail);
	}
	
	@PostMapping("/uploadImage/{userId}")
	public int handleFileUpload(@PathVariable int userId , @RequestParam("file") MultipartFile file, HttpSession session) {
		return userService.store(file, userId, session);		
	}
	
}

创建属性文件
在这里，我们正在 src/main/resources 项目中创建属性文件。

application.properties

spring.http.multipart.max-file-size=1024KB
spring.http.multipart.max-request-size=1024KB

persistence-mysql.properties

#
# JDBC connection properties
#
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://:3306/fileuploadexample?useSSL=false
jdbc.user=root
jdbc.password=

#
# Connection pool properties
#
connection.pool.initialPoolSize=5
connection.pool.minPoolSize=5
connection.pool.maxPoolSize=20
connection.pool.maxIdleTime=3000

#
# Hibernate properties
#
<!-- hibernate.dialect=org.hibernate.dialect.MySQLDialect -->
hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
hibernate.show_sql=true
hibernate.format_sql=true
hibernate.hbm2ddl=update
hibernate.packagesToScan=com.javatpoint.FileUploadExample.entity

Angular 模块

让我们看看我们需要遵循的 Angular 目录结构

创建一个 Angular 项目

让我们使用以下命令创建一个 Angular 项目

ng new FileUploadExample

这里，FileUploadExample 是项目的名称。

安装 Bootstrap CSS 框架

使用以下命令在项目中安装 Bootstrap。

现在，在 style.css 文件中包含以下代码。

生成组件
在 Visual Studio 中打开项目，然后使用以下命令生成 Angular 组件
ng g c Register

让我们也使用以下命令创建一个服务类：-

ng g s services/UserDetail

编辑 app.module.ts 文件
- 导入 ReactiveFormsModule - 在这里，我们导入用于响应式表单的 ReactiveFormsModule，并在 imports 数组中指定它。
- 导入 HttpModule - 在这里，我们导入用于服务器请求的 HttpModule，并在 imports 数组中指定它。
- 注册服务类 - 在这里，我们在 provider 的数组中提到服务类。

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

// import ReactiveFormsModule for reactive form
import { ReactiveFormsModule } from '@angular/forms';

import { AppComponent } from './app.component';
import { RegisterComponent } from './register/register.component';

import { HttpModule } from '@angular/http';

@NgModule({
  declarations: [
    AppComponent,
    RegisterComponent
  ],
  imports: [
    BrowserModule,
    ReactiveFormsModule,
    HttpModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

编辑 app.component.html 文件

创建 UserDetail.ts 类

让我们使用以下命令创建一个类：-

ng g class classes/UserDetail

现在，在 UserDetail 类中指定必需的字段。

export class UserDetail {

    emailId : string;
    name : string;
    profileImage : string;

}

此类目的是将指定字段与 Spring 实体类的字段进行映射。

编辑 user-detail.service.ts 文件

import { Injectable } from '@angular/core';
import { UserDetail } from '../classes/user-detail';
import { Observable } from 'rxjs';
import { Http, RequestOptions , Headers } from '@angular/http';

@Injectable({
  providedIn: 'root'
})
export class UserDetailService {

  // Base URL
  private  baseUrl = "https://:8080/FileUploadExample/api/";

  constructor(private http: Http) { }

  saveData(userDetail : UserDetail) : Observable<any>
  {
      let url = this.baseUrl + "saveUser";
      return this.http.post(url,userDetail);
  }

  uploadFile( file: File , id : number ) : Observable<any>
  {
    let url = this.baseUrl + "uploadImage/" + id ;

    const formdata: FormData = new FormData();
  
    formdata.append('file', file);
 
    return this.http.post(url , formdata);
  }
}

编辑 register.component.ts 文件

import { Component, OnInit } from '@angular/core';
import { FormGroup, FormControl, Validators } from '@angular/forms';
import { UserDetail } from '../classes/user-detail';
import { UserDetailService } from '../services/user-detail.service';
import { jsonpFactory } from '@angular/http/src/http_module';

@Component({
  selector: 'app-register',
  templateUrl: './register.component.html',
  styleUrls: ['./register.component.css']
})
export class RegisterComponent implements OnInit {

  selectedFiles: FileList;
  currentFileUpload: File;

  private userDetail = new UserDetail(); 
  
  constructor(private userDetailService : UserDetailService) { }

  ngOnInit() {
  }

  selectFile(event) {
    const file = event.target.files.item(0);
 
    if (file.type.match('image.*')) {
      var size = event.target.files[0].size;
      if(size > 1000000)
      {
          alert("size must not exceeds 1 MB");
          this.form.get('profileImage').setValue("");
      }
      else
      {
        this.selectedFiles = event.target.files;
      }
    } else {
      alert('invalid format!');
    }

  }   

  // create the form object.
  form = new FormGroup({
    fullName : new FormControl('' , Validators.required),
    email : new FormControl('' , Validators.required),
    profileImage : new FormControl()
  });

  AdminForm(AdminInformation)
  {
    this.userDetail.name = this.FullName.value;
    this.userDetail.emailId = this.Email.value;

    console.log(this.userDetail);

    this.userDetailService.saveData(this.userDetail).subscribe(
      response => {
          let result = response.json();
          console.log(result);
          if(result > 0 )
          {
            if(this.selectedFiles != null)
            {
              this.currentFileUpload = this.selectedFiles.item(0);
              console.log(this.currentFileUpload);

              this.userDetailService.uploadFile(this.currentFileUpload , result).subscribe(
                  res => {

                    let re = res.json();
                     if(re > 0)
                     {
                        alert("file upload successfully ");
                        this.form.get('fullName').setValue("");
                        this.form.get('email').setValue("");
                        this.form.get('profileImage').setValue("");
                     }
                     else{
                        alert("error while uploading fie details");
                     }
                  },
                  err => {
                      alert("error while uploading fie details");
                  }
              );

            }
          }
      },
      error => {
        console.log("error while saving data in the DB");
      }
    );

  }

    get FullName(){
      return this.form.get('fullName');
    }

    get Email(){
        return this.form.get('email');
    } 



     
}

编辑 register.component.html 文件

<h2>Registration form</h2>

<form [formGroup]="form" #AdminInformation (ngSubmit)="AdminForm(AdminInformation)">

  <div class="row">
    <div class=" col-md-offset-1 col-md-4">
        <label for="fullName"> Name </label>
        <input formControlName="fullName" class="form-control" type="text"> 
    </div>
  </div>

  <div class="row">
    <div class=" col-md-offset-1 col-md-4">
        <label for="email"> Email </label>
        <input formControlName="email" class="form-control" type="text"> 
    </div>
  </div>

  
  <div class="row">
    <div class=" col-md-offset-1 col-md-4">
        
      <label for="profileImage">Upload Image</label>
        <input formControlName="profileImage" class="form-control" type="file" (change)="selectFile($event)"> 
    </div>
  </div>

  <div class="row" style="margin-top: 40px;">
    <div class="col-md-offset-1 col-md-4">
        <button class="btn btn-md btn-primary btn-style"  >Save</button>
    </div>
  </div>

</form>

完成后，在 Web 浏览器上提供 URL https://:4200/。将出现以下网页