Spring学习之文件上传

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文件上传功能

1.编写前端页面

<form role="form" th:action="@{/upload}" method="post" enctype="multipart/form-data">
    <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">名字</label>
        <input type="text" name="username" class="form-control" id="exampleInputPassword1" placeholder="Password">
    </div>
    <div class="form-group">
        <label for="exampleInputFile">头像</label>
        <input type="file" name="headerImg" id="exampleInputFile">
        <p class="help-block">Example block-level help text here.</p>
    </div>
    <div class="form-group">
        <label for="exampleInputFile">生活照</label>
        <input type="file" name="photos" multiple>
        <p class="help-block">Example block-level help text here.</p>
    </div>
    <div class="checkbox">
        <label>
            <input type="checkbox"> Check me out
        </label>
    </div>
    <button type="submit" class="btn btn-primary">Submit</button>
</form>

2.编写uploadcontroller层

@PostMapping("/upload")
public String upload(@RequestParam("email") String email,
                   @RequestParam("username") String username,
                   @RequestPart("headerImg") MultipartFile headerImg,
                   @RequestPart("photos") MultipartFile[] photos) throws IOException {
    log.info("上传的信息：email={}， username={}， headerImg={}, photos={}",
            email,username,headerImg.getSize(),photos.length);


    if(!headerImg.isEmpty()) {
        String originalFilename = headerImg.getOriginalFilename();
        headerImg.transferTo(new File("D:\\myblog\\"+originalFilename));
    }

    if (photos.length>0) {
        for (MultipartFile photo : photos) {
            if (!photo.isEmpty()) {
                String originalFilename = photo.getOriginalFilename();
                photo.transferTo(new File("D\\myblog\\"+originalFilename));
            }
        }
    }
    return "main";
}

3.编写实际上传文件的大小限制，单文件大小限制在1MB，多文件限制在10MB

spring.servlet.multipart.max-file-size=10MB
spring.servlet.multipart.max-request-size=100MB