文件上传下载
- 导入文件上传所需的依赖
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
- springmvc配置文件
# 配置跳转到上传下载的页面
<mvc:view-controller path="/file" view-name="file"></mvc:view-controller>
# http://localhost:8080/上下文路径/ file
<!--配置文件上传解析器，将上传的文件封装为MultipartFile-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean>
- 编写thymeleaf页面
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>测试文件上传和下载</title>
</head>
<body>
<a th:href="@{/testDown}">下载1.jpg</a><br>
<form th:action="@{/testUp}" method="post" enctype="multipart/form-data">
头像：<input type="file" name="photo"><br>
<input type="submit" value="上传">
</form>
</body>
</html>
- 编写控制器
@Controller
public class FileUpAndDownController {
@RequestMapping("/testDown")
public ResponseEntity<byte[]> testResponseEntity(HttpSession session) throws IOException {
//获取ServletContext对象
ServletContext servletContext = session.getServletContext();
//获取服务器中文件的真实路径
String realPath = servletContext.getRealPath("/static/img/1.jpg");
System.out.println(realPath);
//创建输入流
InputStream is = new FileInputStream(realPath);
//创建字节数组
byte[] bytes = new byte[is.available()];
//将流读到字节数组中
is.read(bytes);
//创建HttpHeaders对象设置响应头信息
MultiValueMap<String, String> headers = new HttpHeaders();
//设置要下载方式以及下载文件的名字
headers.add("Content-Disposition", "attachment;filename=1.jpg");
//设置响应状态码
HttpStatus statusCode = HttpStatus.OK;
//创建ResponseEntity对象
ResponseEntity<byte[]> responseEntity = new ResponseEntity<>(bytes, headers, statusCode);
//关闭输入流
is.close();
return responseEntity;
}
@RequestMapping("/testUp")
public String testUp(MultipartFile photo, HttpSession session) throws IOException {
//获取上传的文件的文件名
String fileName = photo.getOriginalFilename();
//获取上传的文件的后缀名
String suffixName = fileName.substring(fileName.lastIndexOf("."));
//将UUID作为文件名
String uuid = UUID.randomUUID().toString().replaceAll("-","");
//将uuid和后缀名拼接后的结果作为最终的文件名
fileName = uuid + suffixName;
//通过ServletContext获取服务器中photo目录的路径
ServletContext servletContext = session.getServletContext();
String photoPath = servletContext.getRealPath("photo");
File file = new File(photoPath);
//判断photoPath所对应路径是否存在
if(!file.exists()){
//若不存在，则创建目录
file.mkdir();
}
String finalPath = photoPath + File.separator + fileName;
//上传文件
photo.transferTo(new File(finalPath));
return "success";
}
}
