【广州校区】+【原创】基于servlet的文件上传 - 黑马程序员技术交流社区

public class UploadServlet 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 {
      //1. 获取文件上传的目录路径
      String path = request.getSession().getServletContext().getRealPath("/upload/");
      //2. 获取日期
      String date = new SimpleDateFormat("yyyy-MM-dd ").format(new Date());
      //3. 创建目录对象
      File file = new File(path+date);
      if (!file.exists()){
         file.mkdirs();
      }

      FileItemFactory factory = new DiskFileItemFactory();
      ServletFileUpload upload = new ServletFileUpload(factory);
      // 把请求数据转换为FileItem对象
      List<FileItem> items = null;
      try {
         items = upload.parseRequest(request);
      } catch (FileUploadException e) {
         e.printStackTrace();
      }
      // 遍历
      for(FileItem item : items){
         //判断
         if(item.isFormField()){
            // 普通表单元素如：<input type="text"/>
            System.out.println("获取输入用户：" + item.getString("UTF-8"));
         }else{
            // 文件域：<input type="file" />

            // 获取文件名
            String fileName = item.getName();
            // 获取后缀
            String last = fileName.substring(fileName.lastIndexOf("."));
            // 处理文件名唯一
            String uniqueFileName = UUID.randomUUID().toString().replaceAll("-","") + last;
            // 文件上传
            try {
                  item.write(new File(file,uniqueFileName));
            } catch (Exception e) {
                  e.printStackTrace();
            }
            // 删除临时文件
            item.delete();
         }
      }
}
}