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。
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片。 请记住,图像大小不得超过1 MB。
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。 用于数据库的MySQL。 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。
在这里,我们使用以下技术:
Spring5 Hibernate5 Angular6 MYSQL
让我们创建数据库 fileuploadexample 。无需创建表,因为Hibernate会自动创建它。
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.nhooo</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
我们执行基于注释的配置,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.nhooo.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.nhooo.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.nhooo.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,我们将创建一个Entity/POJO(普通的旧Java对象)类。
UserDetail.java
package com.nhooo.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DAO接口以执行与数据库相关的操作。
UserDAO.java
package com.nhooo.FileUploadExample.DAO.interfaces; import com.nhooo.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.nhooo.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.nhooo.FileUploadExample.DAO.interfaces.UserDAO; import com.nhooo.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,充当DAO和实体类之间的桥梁。
UserService.java
package com.nhooo.FileUploadExample.service.interfaces; import javax.servlet.http.HttpSession; import org.springframework.web.multipart.MultipartFile; import com.nhooo.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.nhooo.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.nhooo.FileUploadExample.DAO.interfaces.UserDAO; import com.nhooo.FileUploadExample.entity.UserDetail; import com.nhooo.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.nhooo.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.nhooo.FileUploadExample.entity.UserDetail; import com.nhooo.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.nhooo.FileUploadExample.entity
让我们看一下我们需要遵循的Angular目录结构:
创建一个Angular项目
让我们使用以下命令创建Angular项目:
ng新的FileUploadExample
这里, FileUploadExample 是项目的名称。
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:
ng g c Register
我们还通过使用以下命令: -
ng gs services/UserDetail
编辑 app.module.ts 文件 导入ReactiveFormsModule -在这里,我们将导入 ReactiveFormsModule 用于反应形式,并在imports数组中指定它。 导入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,我们在提供者的数组中提到了服务类。
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: -
ng g类class/UserDetail
现在,在 UserDetail 类中指定必填字段。
export class UserDetail { emailId : string; name : string; profileImage : string; }
此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 private baseUrl = "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 = 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,在网站上提供URL http: //localhost: 4200/浏览器。出现以下网页:
现在,我们可以填写所需的信息并选择需要上传的文件。