JAVA 大作业——DAY 5

进度日记：9.2

18:27 终于完成上传图片的功能

servlet中获得当前工程路径

String path = getServletContext().getRealPath("/");

html中form

<form enctype="multipart/form-data" action="/Browser/UploadServlet" method="post" >
<input type="hidden" name="userID" id="userID" value="" />
<div><b>Choose the file To Upload:</b>
<input name="file" TYPE="file" /></div>
<div><input class="super-emphasize" type="submit" value="Save" /></div>
</form>

UploadServlet，获得图片和其他参数。

其中，因为form的enctype="multipart/form-data"，所以userID无法用response.getParameter()方法获得！

　　　　　　　DiskFileItemFactory fac = new DiskFileItemFactory();
            ServletFileUpload upload = new ServletFileUpload(fac);
            upload.setHeaderEncoding("utf-8");
            List fileList = null;
            fileList = upload.parseRequest(request);
            userID = ((FileItem)fileList.get(0)).getString();   //获取userID参数
            if (userID == null) {
                userID = "get no name";
            }
            System.out.println(userID);
                 
            Iterator<FileItem> it = fileList.iterator();
            String name = "";
            while (it.hasNext()) {
                FileItem item = it.next();
                if (!item.isFormField()) {
                    name = item.getName();
                    if (name == "" || name == null) {
                        throw new Exception();    
                    }
                    File file = new File(path + File.separatorChar + userID + name);
                    if (file.exists()) {
                        errorMessage = "该文件已经存在！请重命名后再上传。";
                    }
                    item.write(file);
                    item.delete();  //释放输出流
                }
            }