<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</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-test</artifactId>
</dependency>
//Ly-common包含了自定义异常处理
<dependency>
<groupId>com.leyou.common</groupId>
<artifactId>Ly-common</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
server:
port: 8082
spring:
application:
name: upload-service
servlet:
multipart:
max-file-size: 5MB # 限制文件上传的大小
max-request-sieze: 10MB #限制每次请求的上传的文件大小
# Eureka
eureka:
client:
service-url:
defaultZone: http://127.0.0.1:10086/eureka
instance:
lease-renewal-interval-in-seconds: 5 # 每隔5秒发送一次心跳
lease-expiration-duration-in-seconds: 10 # 10秒不发送就过期
prefer-ip-address: true
ip-address: 127.0.0.1
@SpringBootApplication
@EnableDiscoveryClient
public class LyUploadApplication {
public static void main(String[] args) {
SpringApplication.run(LyUploadApplication.class);
}
}
当文件上传成功时返回一个文件路径 ResponseEntity.status(HttpStatus.OK).body(url);
@RestController
@RequestMapping("upload")
public class UploadController {
@Autowired
private UploadService uploadService;
@PostMapping("image") //当文件上传的时候 SpringMvc会自动把上传的文件封装到MultipartFile中去
public ResponseEntity<String> uploadImg(@RequestParam("file") MultipartFile file) {
String url=uploadService.uuploadImg(file);
//
return ResponseEntity.status(HttpStatus.OK).body(url);
}
}
当文件上传的时候 SpringMvc会自动把上传的文件封装到MultipartFile中去。使用MultipartFile来接受文件
@RequestParam("file") MultipartFile file
@Service
@Slf4j
public class UploadService {
private static final List<String> ALLOW_TYPES= Arrays.asList("image/jpeg","image/png");
public String uploadImg(MultipartFile file) {
try {
//检验文件的类型 防止恶意文件
String contentType = file.getContentType();
if (!ALLOW_TYPES.contains(contentType)){
throw new LyException(ExceptionEnum.INVALID_FILE_TYPE);
};
//校验文件的内容
BufferedImage image = ImageIO.read(file.getInputStream());
if (image==null){
throw new LyException(ExceptionEnum.INVALID_FILE_TYPE);
}
//保存文件到本地
File local = new File("F:\\javaee\\IdeaResource\\uploadImg\\",file.getOriginalFilename());
file.transferTo(local);
//返回文件地址
return "http://image.leyou.com/"+file.getOriginalFilename();
} catch (IOException e) {
log.error("上传失败",e);
throw new LyException(ExceptionEnum.UPLOAD_FILE_ERROR);
}
}
}
代码详解：1.防止恶意文件对文件进行简单的校验
保证文件后缀名是我们规定的：
private static final List<String> ALLOW_TYPES= Arrays.asList("image/jpeg","image/png");
Arrays.asList可以报我们 直接把参数转化成数组元素
保证文件内容是图片：如果检验到图片则image为空
//校验文件的内容
BufferedImage image = ImageIO.read(file.getInputStream());
if (image==null){
throw new LyException(ExceptionEnum.INVALID_FILE_TYPE);
}
2.上传图片
使用transferTo（dest）方法将上传文件写到服务器上指定的文件。
//保存文件到本地
File local = new File("F:\\javaee\\IdeaResource\\uploadImg\\",file.getOriginalFilename());
file.transferTo(local);
//返回文件地址
return "http://image.leyou.com/"+file.getOriginalFilename();
返回地址上传成功
原文：https://www.cnblogs.com/asndxj/p/11574531.html