springboot上传图片到本地
简介：本文讲解，如何使用springboot，将代码上传到本地的某个特定的文件夹。
项目的演示文件，在这个地址：https://gitee.com/geek-li-hua/code-in-blog.git
- 项目结构
数据库设计
DROP TABLE IF EXISTS `url_database`;
CREATE TABLE `url_database` (
`id` int NOT NULL AUTO_INCREMENT COMMENT '图片id',
`url` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NOT NULL COMMENT '图片的url',
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_bin ROW_FORMAT = Dynamic;
application.properties
spring.port = 8080
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.url=jdbc:mysql://localhost:3306/db1?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf-8
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.7.15</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>ImageUploadLocally-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>ImageUploadLocally-demo</name>
<description>ImageUploadLocally-demo</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<!-- Spring Boot Starter JDBC -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!-- Project Lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<scope>provided</scope>
</dependency>
<!-- MySQL Connector/J -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.32</version>
</dependency>
<!-- MyBatis Plus Boot Starter -->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.5.2</version>
</dependency>
<!-- MyBatis Plus Generator -->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-generator</artifactId>
<version>3.5.3</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
关键方法
这个方法就是，上传文件的核心代码。
/**
* 上传文件方法
*
* @param file 要上传的文件
* @return 返回上传结果
*/
public String upload(MultipartFile file) {
if (file.isEmpty()) {
return "No file uploaded"; // 如果文件为空，则返回提示信息"未上传文件"
}
String originalFilename = file.getOriginalFilename(); // 获取原始文件名
String ext='.' + originalFilename.split("\\.")[1]; // 获取文件扩展名
String uuid = UUID.randomUUID().toString().replace("-", ""); // 生成随机UUID
String newFileName = uuid + ext; // 新文件名
// 上传图片
ApplicationHome applicationHome = new ApplicationHome(this.getClass()); // 获取应用程序的根目录
String pre = applicationHome.getDir().getParentFile().getParentFile().getAbsolutePath() +
"\\src\\main\\resources\\static\\images\\"; // 设置图片存储路径
String path = pre + newFileName; // 图片完整路径
try{
file.transferTo(new File(path)); // 将文件保存到指定路径
} catch (IOException e){
e.printStackTrace(); // 打印异常信息
}
return path; // 返回上传成功信息
}
然后就是再这个基础上封装一下返回结果，和对于数据库的CRUD。
于是有了下面的代码
/**
* <p>
* 前端控制器
* </p>
*
* @author jakelihua
* @since 2023-09-10
*/
@Controller
@RequestMapping("/url-database")
public class UrlDatabaseController {
/**
* 上传文件方法
*
* @param file 要上传的文件
* @return 返回上传结果
*/
@Autowired
private IUrlDatabaseService urlDatabaseService;
@PostMapping("/upload")
public Result addFile(MultipartFile file) {
String path = upload(file);
if (path.equals("No file uploaded")) {
return Result.fail("No file uploaded");
}
System.out.println(path);
if (urlDatabaseService.save(new UrlDatabase(path))){
return Result.success(path);
} else {
return Result.fail("save fail");
}
}
public String upload(MultipartFile file) {
if (file.isEmpty()) {
return "No file uploaded"; // 如果文件为空，则返回提示信息"未上传文件"
}
String originalFilename = file.getOriginalFilename(); // 获取原始文件名
String ext='.' + originalFilename.split("\\.")[1]; // 获取文件扩展名
String uuid = UUID.randomUUID().toString().replace("-", ""); // 生成随机UUID
String newFileName = uuid + ext; // 新文件名
// 上传图片
ApplicationHome applicationHome = new ApplicationHome(this.getClass()); // 获取应用程序的根目录
String pre = applicationHome.getDir().getParentFile().getParentFile().getAbsolutePath() +
"\\src\\main\\resources\\static\\images\\"; // 设置图片存储路径
String path = pre + newFileName; // 图片完整路径
try{
file.transferTo(new File(path)); // 将文件保存到指定路径
} catch (IOException e){
e.printStackTrace(); // 打印异常信息
}
return path; // 返回上传成功信息
}
// 路由器首页
@RequestMapping("/")
public String index(){
return "index.html";
}
}
添加成功的标致。
- 前端测试代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>上传图片</title>
</head>
<body>
<form action="/url-database/upload" method="post" enctype="multipart/form-data">
<input type="file" name="file" value="上传图片">
<input type="submit" value="上传">
</form>
</body>
</html>