springMVC-07-文件上传

文件上传

创建文件上传类

package com.huangxin.order.controller;
import com.huangxin.order.service.FileService;
import com.huangxin.order.uploadUtil.R;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.IOException;
@Controller
public class UploadController {
    @Autowired
    private FileService fileService;
    @GetMapping("/upload")
    public String upload() {
        return "upload/upload";
    }
    //单文件上传
    @PostMapping("/upload")
    @ResponseBody
    public R upload(MultipartFile multipartFile) {
        String str = fileService.upload(multipartFile);
        return R.ok(str);
    }
    //多文件上传
    @PostMapping("/uploads")
    @ResponseBody
    public R upload(@RequestParam("multipartFile") MultipartFile[] multipartFiles) {//多个文件上传
        try {
            for (MultipartFile multipartFile1 : multipartFiles) {
                File file = new File("D:/" + multipartFile1.getOriginalFilename());
                multipartFile1.transferTo(file);
            }
        } catch (Exception e) {
            e.printStackTrace();
            return R.error("文件上传失败");
        }
        return R.ok("文件上传成功");
    }
}

工具类

package com.huangxin.order.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpSession;
import java.io.File;
import java.io.IOException;
public class FileService {
    @Autowired
    private HttpSession httpSession;
    public String upload(MultipartFile multipartFile) {
        String realPath = null;
        try {
            //拿到路径
            realPath = httpSession.getServletContext().getRealPath("/");
            File file = new File(realPath + multipartFile.getOriginalFilename());
            multipartFile.transferTo(file);//保存文件
        } catch (IOException e) {
            e.printStackTrace();
        }
        return realPath;
    }
}