1.搭建一个新的微服务Ly-upload用来上传文件
2.导入文件上传到额依赖
<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>
3.编写application.yaml的文件配置
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
4.起动类
@SpringBootApplication
@EnableDiscoveryClient
public class LyUploadApplication {
public static void main(String[] args) {
SpringApplication.run(LyUploadApplication.class);
}
}
5.接受参数name="file"
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
6.文件上传
@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();
7测试
返回地址上传成功
8.服务器上传图片时非常消耗网关的时间资源
当nginx检测到收到的地址是/api/upload/*是不在向网关转发,而是直接转发到该资源所在的位置
# 上传路径的映射
server {
listen 80;
server_name api.leyou.com;
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
location /api/upload {
rewrite "^/(.*)$" /zuul/$1;
proxy_pass http://192.168.11.82:8082;
}
location / {
proxy_pass http://192.168.11.82:10010;
proxy_connect_timeout 600;
proxy_read_timeout 600;
}
}
-
首先,我们映射路径是/api/upload,而下面一个映射路径是 / ,根据最长路径匹配原则,/api/upload优先级更高。也就是说,凡是以/api/upload开头的路径,都会被第一个配置处理
-
proxy_pass
:反向代理,这次我们代理到8082端口,也就是upload-service服务 -
rewrite
"^/(.*)$" /zuul/$1;路径重写 去除http://api.leyou.com/api/upload/image中的api前缀
修改完成,输入nginx -s reload