java - 文件上传的路径问题

问题描述

问 题

public class UploadServlet3 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //检测form是否是multipart/form-data类型的
        boolean isMultipart = ServletFileUpload.isMultipartContent(request);
        if (!isMultipart) {
            throw new RuntimeException("The form's enctype attribute value must be multipart/form-data");
        }
        //解析请求内容
        DiskFileItemFactory factory = new DiskFileItemFactory();    //产生FileItem的工厂
        ServletFileUpload sfu = new ServletFileUpload(factory);
        List<FileItem> items = new ArrayList<FileItem>();
        try {
            items = sfu.parseRequest(request);
        } catch (FileUploadException e) {
            throw new RuntimeException("解析请求失败");
        }
        //遍历:
        for (FileItem item : items) {
            //处理普通字段
            if (item.isFormField()) {
                processFormField(item);
            } else {
                //处理上传字段
                processUploadField(item);
            }
        }


    }

    protected void processUploadField(FileItem item) {
        try {
            InputStream in = item.getInputStream();
            //找一个存放文件的位置;存放的文件名
            String fileName = item.getName();   //上传的文件的文件名
            if (fileName != null) {
                fileName = FilenameUtils.getName(fileName);
            }
            //存放路径
            String realPath = getServletContext().getRealPath("/WEB-INF/files");
            File storeDirectory = new File(realPath);
            if (!storeDirectory.exists()) {
                storeDirectory.mkdirs();
            }

            //OutputStream out = new FileOutputStream(new File(storeDirectory, fileName));

            //int len = -1;
            //byte[] b = new byte[1024];
            //while ((len = in.read(b)) != -1) {
            //    out.write(b, 0, len);
            //}
            //in.close();
            //out.close();

            item.write(new File(storeDirectory, fileName));

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    protected void processFormField(FileItem item) {
        //打印到控制台
        String fieldName = item.getFieldName();
        String fieldValue = item.getString();
        System.out.println(fieldName + "=" + fieldValue);
    }
}

其中：

        //存放路径
        String realPath = getServletContext().getRealPath("/WEB-INF/files");
        

在部署到tomcat中后，并没有发现上传后的文件在WEB-INF目录下，这样不就不能保证服务器端的安全吗？反而是在项目根目录下发现的。

解决方案

jsp的表单提交给servlet的路径错误

这篇关于java - 文件上传的路径问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！