SpringBoot实现文件上传

你的名字 2022-06-01 08:23 241阅读 0赞

添加依赖：

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

上传页面——upload\_page.html

<!DOCTYPE HTML>
    <html xmlns:th="http://www.thymeleaf.org">
    <head>
        <title>SpringBoot模版渲染</title>
        <script type="text/javascript" th:src="@{/js/main.js}"></script> 
        <link rel="icon" type="image/x-icon" href="/images/mldn.ico"/>
        <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>
    </head>
    <body>
        <form th:action="@{/upload}" method="post" enctype="multipart/form-data">
            姓名：<input type="text" name="name"/><br/>
            文件1：<input type="file" name="file"/><br/>
            文件2：<input type="file" name="file"/><br/>
            文件3：<input type="file" name="file"/><br/>
            <input type="submit" value="上传"/>
        </form>
    </body> 
    </html>

UploadController.java

@Controller
    public class UploadController { 
        @RequestMapping(value = "/uploadPre", method = RequestMethod.GET)
        public String uploadPre() { // 通过model可以实现内容的传递
            return "upload_page";
        }
        @RequestMapping(value = "/upload", method = RequestMethod.POST)
        @ResponseBody
        public String uploadImg(@RequestParam("file") MultipartFile[] files,
                HttpServletRequest request) {
            for (MultipartFile file : files) {
                // 文件名
                String fileName = file.getOriginalFilename();
                if("".equals(fileName)){
                    continue;
                }
                // 文件后缀
                String suffx = fileName.substring(fileName.lastIndexOf('.'));
                String filePath = request.getSession().getServletContext()
                        .getRealPath("imgupload/");
                try {
                    FileUtil.uploadFile(file, filePath, new Date().getTime()
                            + suffx);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            // 返回json
            return "uploadimg success";
        }
    }

FileUtil.java

/** * 将文件写入 * * @author xiangzi * */
    public class FileUtil { 
        public static void uploadFile(MultipartFile file, String filePath,
                String fileName) throws Exception {
            File targetFile = new File(filePath);
            if (!targetFile.exists()) {
                targetFile.mkdirs();
            }
            file.transferTo(new File(filePath + fileName));
        }
    }

限制上传文件大小：

//单个文件大小
    spring.http.multipart.maxFileSize=1Mb
    //上传文件大小
    spring.http.multipart.maxRequestSize=100Mb