java查看已上传的文件夹_SpringMVC文件上传及查看的示例代码

以下是SpringMVC文件上传及查看的示例代码：

1. 文件上传：

@Controller
@RequestMapping("/file")
public class FileController {

    @RequestMapping(value = "/upload", method = RequestMethod.POST)
    @ResponseBody
    public String upload(@RequestParam("file") MultipartFile file) {
        try {
            // 保存文件
            String fileName = file.getOriginalFilename();
            String filePath = "/path/to/save/" + fileName;
            File dest = new File(filePath);
            file.transferTo(dest);
            return "success";
        } catch (Exception e) {
            e.printStackTrace();
            return "error";
        }
    }
}

2. 文件查看：

@Controller
@RequestMapping("/file")
public class FileController {

    @RequestMapping("/list")
    public String list(Model model) {
        // 获取文件列表
        String fileDirPath = "/path/to/list/";
        File fileDir = new File(fileDirPath);
        File[] fileList = fileDir.listFiles();
        List<String> fileNameList = new ArrayList<>();
        for (File file : fileList) {
            fileNameList.add(file.getName());
        }
        model.addAttribute("fileNameList", fileNameList);
        return "file/list";
    }

    @RequestMapping("/download/{fileName}")
    public void download(@PathVariable("fileName") String fileName, HttpServletResponse response) {
        // 下载文件
        String filePath = "/path/to/download/" + fileName;
        try {
            FileInputStream fis = new FileInputStream(filePath);
            response.setContentType("application/force-download");
            response.addHeader("Content-Disposition", "attachment;fileName=" + fileName);
            byte[] buffer = new byte[1024];
            int len;
            while ((len = fis.read(buffer)) != -1) {
                response.getOutputStream().write(buffer, 0, len);
            }
            fis.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

其中，list方法用于获取文件列表，download方法用于下载文件。注意，download方法中设置了响应头，告诉浏览器下载的文件名字，并将文件内容写入响应体。