一、构建公用项目

1.1 新建maven项目

image.png
pom.xml：

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <project xmlns="http://maven.apache.org/POM/4.0.0"
  3.          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5.     <modelVersion>4.0.0</modelVersion>
  7.     <groupId>com.woniuxy.ticket</groupId>
  8.     <artifactId>ticket-common</artifactId>
  9.     <version>1.0-SNAPSHOT</version>
  11.     <dependencies>
  12.         <dependency>
  13.             <groupId>org.projectlombok</groupId>
  14.             <artifactId>lombok</artifactId>
  15.             <version>1.18.18</version>
  16.         </dependency>
  17.     </dependencies>
  19. </project>

公共工具类：

@Data
@NoArgsConstructor
@AllArgsConstructor
public class ResponseResult<T> {
    private int statusCode;        // 状态码：后台处理的结果
    private String message;        // 消息，提示用
    private T data;                // 返回的数据

    public ResponseResult(int statusCode, String message) {
        this(statusCode, message, null);
    }

    public ResponseResult<T> success(T data){
        this.setStatusCode(200);
        this.setMessage("success");
        this.setData(data);
        return this;
    }

    public ResponseResult<T> success(){
        this.setStatusCode(200);
        this.setMessage("success");
        return this;
    }

    public ResponseResult<T> error(){
        this.setStatusCode(500);
        this.setMessage("fail");
        return this;
    }

}

1.2 在需要使用的项目maven中导入

        <dependency>
            <groupId>com.woniuxy.ticket</groupId>
            <artifactId>ticket-common</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

二、文件上传（本地路径）

2.1 配置文件application.properties

server.port=9001

file.location=E://wn75_ticket_file

spring.resources.static-locations=classpath:static/,file:${file.location}

2.2 FileController

@RestController
@RequestMapping("/file")
public class FileController {
    @Value("${file.location}")
    private String fileLocation;

    @PostMapping("/upload")
    public ResponseResult upload(MultipartFile file){
        //随机生成文件名
        String fileName = UUID.randomUUID().toString().replaceAll("-","");
        //截取后缀
        String suffix = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));

        File file1 = new File(fileLocation);
        if(!file1.exists()){
            file1.mkdirs();
        }
        File newFile = new File(file1,fileName+suffix);
        try {
            file.transferTo(newFile);
        }catch (IOException e){
            e.printStackTrace();
        }
        return new ResponseResult().success(fileName+suffix);
    }
}

获取生成的fileName+suffix，将其填入img的src中

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <img src="8baae898dfbe4088b6b533eb961151ee.jpg" alt="" id="img">
</body>
</html>