简单实现文件上传

SpirigBoot项目

依赖

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.4</version>
        </dependency>
    </dependencies>

主类：

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class UploadTestApplication {

    public static void main(String[] args) {
        SpringApplication.run(UploadTestApplication.class, args);
    }

}

结果集类：

import lombok.AllArgsConstructor;
import lombok.Data;

@Data
@AllArgsConstructor
public class Resp<E> {
    private String code;
    private String message;
    private E body;

    public static<E> Resp<E> success(E body){
        return new Resp("200","上传成功",body);
    }

    public static<E> Resp<E> fail(String code,String message){
        return new Resp(code,message,(Object)null);
    }
}

接口

import com.example.uploadtest.entity.Resp;
import org.springframework.web.multipart.MultipartFile;

public interface UploadService {
    public Resp<String>  upload(MultipartFile file);
}

接口实现类

import com.example.uploadtest.entity.Resp;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;

@Service
public class UploadServiceImpl implements UploadService{
    @Override
    public Resp<String> upload(MultipartFile file) {
        if(file.isEmpty()) return Resp.fail("400","文件为空！");
        //得到文件的原始名字
        String originalFilename = file.getOriginalFilename();
        //根据时间毫秒数取一个新的文件名称
        String fileName = System.currentTimeMillis() + "." + originalFilename.substring(originalFilename.lastIndexOf(".") + 1);
        String filePath="G:\\uploadtest\\";
        File dest = new File(filePath + fileName);
        if (!dest.getParentFile().exists()) dest.getParentFile().mkdirs();
        try {
            file.transferTo(dest);
        } catch (Exception e) {
            e.printStackTrace();
            Resp.fail("500",originalFilename+"上传失败！");
        }
        return Resp.success(fileName);
    }
}

Controllerc控制层

import com.example.uploadtest.entity.Resp;
import com.example.uploadtest.service.UploadService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

@RestController
public class UpLoadController {
    @Autowired
    private UploadService uploadService;
    @RequestMapping(value = "/upload.do",method = RequestMethod.POST)
    public Resp<String> upload(@RequestParam("file") MultipartFile file){
        return uploadService.upload(file);
    }
}