springboot上传文件

1.前端一个form表单

　　可以传用户名，email，单个文件和多个文件

　　表单提交用post请求

　　涉及到文件  enctype="multipart/form-data"

　　表单内容：

　　　　文件：type="file"

　　　　多文件  multiple="multiple"

<form role="form" method="post" enctype="multipart/form-data" th:action="@{/load}">
                            <div class="form-group">
                                <label for="exampleInputEmail1">邮箱</label>
                                <input type="email" name ="email" class="form-control" id="exampleInputEmail1" placeholder="Enter email">
                            </div>
                            <div class="form-group">
                                <label for="exampleInputPassword1">姓名</label>
                                <input type="text" name="username" class="form-control" id="exampleInputPassword1" placeholder="Password">
                            </div>
                            <div class="form-group">
                                <label for="exampleInputFile">一个文件</label>
                                <input type="file" id="exampleInputFile" name="image">
                            </div>
                            <div class="form-group">
                                <label for="exampleInputFile">好多文件</label>
                                <input type="file" multiple="multiple" id="exampleInputFiles" name="photos">
                            </div>
                            <div class="checkbox">
                                <label>
                                    <input type="checkbox"> Check me out
                                </label>
                            </div>
                            <button type="submit" class="btn btn-primary">Submit</button>
 </form>

 文件上传解析器的配置都是以这个开头的，可以配置问文件传输的单个大小跟总体大小

 

实现文件上传的代码

　　文件上传主要用  file.transferTo("文件名")；  文件名注意重复问题，UUID

　　当文件上传被拒绝访问时候，注意管理员权限

package com.example.adminproject.controller;

import lombok.extern.slf4j.Slf4j;
import lombok.extern.slf4j.XSlf4j;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@Controller
public class FormController {
    @GetMapping(value={"/form_layouts","form_layouts.html"})
    public String form_layouts(){
        return "form/form_layouts";
    }

    @PostMapping("/upload")
    public String upload(@RequestParam("email") String email,
                         @RequestParam("username") String username,
                         @RequestPart("image") MultipartFile image,
                         MultipartFile[] photos) throws IOException {
        log.info("前台传递的email是{},username是{},传入图片的大小{},传入图片的数量{}",email,username,image.getSize(),photos.length);

        //将文件保存到服务器
        if(!image.isEmpty()){
            String originalFilename = image.getOriginalFilename();
            String uuid = UUID.randomUUID().toString().replaceAll("-","");
            String name =uuid+"-"+originalFilename;
            image.transferTo(new File("E:\\studyDb\\"+name));
        }
        //将多个文件保存到服务器中
        for (MultipartFile photo : photos) {
            if(!photo.isEmpty()){
                String originalFilename = photo.getOriginalFilename();
                String uuid = UUID.randomUUID().toString().replaceAll("-","");
                String name = uuid+"-"+originalFilename;
                photo.transferTo(new File("E:\\studyDb\\"+name));
            }
        }
        
        return "index";
    }
}