使用 SpringBoot 项目完成单个、多个文件的上传处理，并将上传的文件保存到指定目录下。
代码演示案例
所有的 HTML 页面文件
index.html
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>选择上传文件类型</title>
</head>
<script language="javascript">function single() {document.form1.action = "/singlefile";document.form1.submit();}function multi() {document.form1.action = "/multifile";document.form1.submit();}
</script>
<body>
<form name="form1" method="post"><input type="button" name="btn1" value="单个文件上传" onclick="single();"><input type="button" name="btn2" value="多个文件上传" onclick="multi();">
</form>
</body>
</html>multifile.html
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"/><title>多文件上传</title>
</head>
<body>
<h1 th:inlines="text">多文件上传</h1>
<form action="/multiFileUpload" method="post" enctype="multipart/form-data"><p>选择文件1: <input type="file" name="fileName"/></p><p>选择文件2: <input type="file" name="fileName"/></p><p>选择文件3: <input type="file" name="fileName"/></p><p><input type="submit" value="提交"/></p>
</form>
</body>
</html>singlefile.html
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"/><title>单文件上传</title>
</head>
<body>
<h1 th:inlines="text">单文件上传</h1>
<form action="/singleFile" method="post" enctype="multipart/form-data"><p>文件:<input type="file" name="head_img"/></p><p><input type="submit" value="上传"/></p>
</form>
</body>
</html>逻辑代码
定义结果集@Getter
@Setter
@ToString
public class Result implements Serializable {private boolean flag; //是否成功private Integer code; //返回码private String message;//返回信息public Result(boolean flag, Integer code, String message) {this.flag = flag;this.code = code;this.message = message;}
}定义错误码
public class StatusCode {public static final int OK = 2000; //成功public static final int ERROR = 4000; //失败
}逻辑代码
@Controller
@Slf4j
public class FileController {@Value("${file.path}")private String filePath;// 获取 singlefile.html 页面@RequestMapping(value = "/singlefile", method = RequestMethod.POST)public String single() {return "singlefile";}// 单文件上传@RequestMapping(value = "singleFile")@ResponseBodypublic Result uploadFile(@RequestParam("head_img") MultipartFile file, HttpServletRequest request) {if (file.isEmpty()) {return new Result(false, StatusCode.ERROR, "上传的文件大小为空,请检查!!");}//获取文件名称、后缀名、大小String fileName = file.getOriginalFilename();String suffixName = fileName.substring(fileName.lastIndexOf("."));long size = file.getSize();log.info("上传的文件名称为：[{}],文件后缀为：[{}],文件大小为：[{}]!!", fileName, suffixName, size);// 存储转换后文件名称fileName = UUID.randomUUID() + suffixName;log.info("转换后的文件名为：[{}]!!", fileName);File dest = new File(filePath + fileName);//判断父目录是否存在if (!dest.getParentFile().exists()) {dest.getParentFile().mkdir();}try {file.transferTo(dest);return new Result(true, StatusCode.OK, "上传成功！！");} catch (IOException e) {log.error("上传文件过程中发生异常！", e);}return new Result(true, StatusCode.ERROR, "上传失败！！");}// 获取 multifile.html 页面@RequestMapping("/multifile")public String multi() {return "multifile";}// 多文件上传@PostMapping(value = "multiFileUpload")@ResponseBodypublic Result multiFileUpload(HttpServletRequest request) {List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("fileName");for (MultipartFile file : files) {if (file.isEmpty()) {return new Result(false, StatusCode.ERROR, "上传多个文件时,某个文件大小为空,请检查!!");} else {String fileName = file.getOriginalFilename();String suffixName = fileName.substring(fileName.lastIndexOf("."));long size = file.getSize();log.info("上传的文件名称为：[{}],文件后缀为：[{}],文件大小为：[{}]!!", fileName, suffixName, size);fileName = UUID.randomUUID() + suffixName;log.info("转换后的文件名为：[{}]!!", fileName);File dest = new File(filePath + fileName);if (!dest.getParentFile().exists()) {dest.getParentFile().mkdir();}try {file.transferTo(dest);} catch (IOException e) {log.error("上传文件过程中发生异常!!", e);}}}return new Result(true, StatusCode.OK, "上传成功！！");}
}application.properties
# 端口
server.port=8082
# 配置单个文件、多个文件大小
spring.servlet.multipart.max-file-size=100MB
spring.servlet.multipart.max-request-size=100MB
# 文件上传保存路径
file.path=E:/test/
# 取消模板文件缓存
spring.thymeleaf.cache=false文件 结构目录
