本文概述

• 申请工作
• 使用工具
• 我们使用的技术
• 创建数据库
• Spring模块
• 角度模块
• 安装Bootstrap CSS框架

在本节中, 我们将创建一个File Upload Web应用程序。该申请包括注册表。在这种集成中, 我们使用Spring处理后端部分, 使用Angular处理前端部分。
申请工作

• 一旦我们在服务器上部署了应用程序, 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。

使用工具

• 使用任何IDE来开发Spring和Hibernate项目。可能是MyEclipse / Eclipse / Netbeans。在这里, 我们正在使用Eclipse。
• MySQL用于数据库。
• 使用任何IDE来开发Angular项目。它可能是Visual Studio代码/ Sublime。在这里, 我们正在使用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：

• Spring5
• 休眠5
• 角度6
• MySQL

创建数据库 让我们创建一个数据库文件上传示例。由于Hibernate自动创建了表, 因此无需创建表。
Spring模块 【Spring Angular文件上传应用程序示例图解】让我们看一下我们需要遵循的Spring目录结构：

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要开发文件上传应用程序, 请执行以下步骤：-

• 将依赖项添加到pom.xml文件。

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.srcmini< /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
  代替XML, 我们执行基于注释的配置。因此, 我们创建两个类并在其中指定所需的配置。

DemoAppConfig.java

package com.srcmini.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.srcmini.FileUploadExample") @PropertySource(value = http://www.srcmini.com/{"classpath:persistence-mysql.properties" }) @PropertySource(value = http://www.srcmini.com/{"classpath:persistence-mysql.properties" }) @PropertySource(value = http://www.srcmini.com/{"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); //5MBresolver.setMaxUploadSize(524288); //0.5MB//You may also set other available properties. return resolver; } }

MySpringMvcDispatcherServletInitializer.java

package com.srcmini.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(普通的旧Java对象)类。

UserDetail.java

package com.srcmini.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界面
  在这里, 我们正在创建一个DAO接口来执行与数据库相关的操作。

UserDAO.java

package com.srcmini.FileUploadExample.DAO.interfaces; import com.srcmini.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.srcmini.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.srcmini.FileUploadExample.DAO.interfaces.UserDAO; import com.srcmini.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, 该接口充当DAO和Entity类之间的桥梁。
UserService.java

package com.srcmini.FileUploadExample.service.interfaces; import javax.servlet.http.HttpSession; import org.springframework.web.multipart.MultipartFile; import com.srcmini.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.srcmini.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.srcmini.FileUploadExample.DAO.interfaces.UserDAO; import com.srcmini.FileUploadExample.entity.UserDetail; import com.srcmini.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.srcmini.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.srcmini.FileUploadExample.entity.UserDetail; import com.srcmini.FileUploadExample.service.interfaces.UserService; @RestController @RequestMapping("/api") @CrossOrigin(origins = "http://localhost: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, 我们正在项目的src / main / resources内部创建属性文件。
< >

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://localhost: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.srcmini.FileUploadExample.entity

角度模块 让我们看看我们需要遵循的Angular目录结构：

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• 创建一个Angular项目

让我们使用以下命令创建一个Angular项目：
新FileUploadExample的

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在这里, 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引导程序。

npm install bootstrap@3.3.7 --save

现在, 在style.css文件中包含以下代码。

@import "~bootstrap/dist/css/bootstrap.css";

• 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：
  g c的寄存器

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我们还使用以下命令创建服务类：-
g服务/ UserDetail

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• 编辑app.module.ts文件
  • 导入ReactiveFormsModule-在这里, 我们将为反应形式导入ReactiveFormsModule, 并在import数组中指定它。
  • Import HttpModule-在这里, 我们将为服务器请求导入HttpModule, 并在imports数组中指定它。
  • 注册服务类-在这里, 我们将在提供者的数组中提及服务类。

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

< app-register> < /app-register>

• 创建UserDetail.ts类

让我们使用以下命令创建一个类：-
g类的类/ UserDetail

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现在, 在UserDetail类中指定必填字段。

export class UserDetail {emailId : string; name : string; profileImage : string; }

该类的目的是将指定的字段与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 privatebaseUrl = "http://localhost: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 = http://www.srcmini.com/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浏览器中提供URL http：// localhost：4200 /。出现以下网页：

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现在, 我们可以填写所需的信息, 然后选择需要上传的文件。

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下载此示例

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