springmvc文件上传下载

上传文件

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


    @PostMapping("/upload")
    @ResponseBody
    public String upload(@RequestParam("file") MultipartFile file, HttpServletRequest request) {
        if (!file.isEmpty()) {
            long l = System.currentTimeMillis();
            Date date = new Date(l);
            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmss_");
            String prefix = dateFormat.format(date);
            String saveFileName = prefix + file.getOriginalFilename();
            File saveFile = new File(request.getSession().getServletContext().getRealPath("/upload/") +"/" +saveFileName);
            if (!saveFile.getParentFile().exists()) {
                saveFile.getParentFile().mkdirs();
            }
            try {
                BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(saveFile));
                out.write(file.getBytes());
                out.flush();
                out.close();
                return "success";
            } catch (FileNotFoundException e) {
                e.printStackTrace();
                return "failure";
            } catch (IOException e) {
                e.printStackTrace();
                return "failure";
            }
        } else {
            return "failure";
        }
    }

}

下载文件

@Controller
@RequestMapping
public class ToFileListController {

    @Autowired
    private ServletContext servletContext;


    @RequestMapping("/fileList")
    public String  fileList(Model model){

        ArrayList<String> list = new ArrayList<String>();
        ArrayList<String> files = getFiles(servletContext.getRealPath("/upload/"));

        for(int i = 0;i<files.size();i++) {
            File tempFile =new File( files.get(i).trim());

            String fileName = tempFile.getName();
            list.add(fileName);
        }
        model.addAttribute("files", list);
        return "fileList";
    }

    public static ArrayList<String> getFiles(String path) {
        ArrayList<String> files = new ArrayList<String>();
        File file = new File(path);
        File[] tempList = file.listFiles();

        for (int i = 0; i < tempList.length; i++) {
            if (tempList[i].isFile()) {
                files.add(tempList[i].toString());
            }
        }
        return files;
    }
}






@Controller
@RequestMapping
public class DownloadFileController {

    @Autowired
    private ServletContext servletContext;

    @RequestMapping(value = "/testDownload", method = RequestMethod.GET)
    public void Download(HttpServletRequest req  , HttpServletResponse res) {
        String fileName =  req.getParameter("name");
        res.setHeader("content-type", "application/octet-stream");
        res.setContentType("application/octet-stream");
        res.setHeader("Content-Disposition", "attachment;filename=" + fileName);
        byte[] buff = new byte[1024];
        BufferedInputStream bis = null;
        OutputStream os = null;
        try {
            os = res.getOutputStream();
            bis = new BufferedInputStream(new FileInputStream( new File(servletContext.getRealPath("/upload/") +"/"+fileName)));
            int i = bis.read(buff);
            while (i != -1) {
                os.write(buff, 0, buff.length);
                os.flush();
                i = bis.read(buff);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (bis != null) {
                try {
                    bis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        System.out.println("success");
    }
}

下载列表

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
    <title>Title</title>

    <style type="text/css">
        a{
            text-decoration:none;
        }
        table , td ,th{

            border:1px solid black;
            border-collapse:collapse;/*细线表格，合并边框*/
        }
    </style>
</head>
<body>
<div style="margin-top: 20px"></div>
<table id="content" width="800" border="0" cellspacing="0" cellpadding="0">
    <caption align="top">异常文件列表</caption>
    <c:forEach items="${files}" var="user"  varStatus="status">

        <tr align="center">

            <td height="40px"> ${status.index}</td>
            <td> ${user}</td>
            <td><a href="/testDownload?name=${user}">下载</a></td>

        </tr>

    </c:forEach>
</table>


</body>
</html>

springmvc文件上传下载

猜你喜欢