使用webkitDirectory和Java Servlet上传文件夹/子目录中的文件 [英] Upload files in folder/subdirectories using webkitDirectory and Java Servlet
问题描述
Step1。使用webkitdirectory设计一个HTML表单
$ p $ lt; code>< form action =DataUploadmethod =postenctype =multipart / form-数据>
< input type =textname =dbNamevalue =Database Name Hereid =dbName/>
< input type =fileid =ctrlwebkitdirectory directory multiple />
< input type =submit/>
< / form>
步骤2.将信息从 form 传递给 Servlet
public class DataUpload extends HttpServlet {
protected void doPost（HttpServletRequest请求，HttpServletResponse响应）{
ServletFileUpload upload = new ServletFileUpload（）;
FileItemIterator fileIterator;
尝试{
fileIterator = upload.getItemIterator（request）;
InputStream inputStream = null;
BufferedReader br = null;
System.out.println（CheckPoint 1）;
while（fileIterator.hasNext（））{
System.out.println（CheckPoint 2）;
FileItemStream item = fileIterator.next（）;
String inputFileName = FilenameUtils.getName（item.getName（））;
inputStream = item.openStream（）;
inputFileName = inputFileName.split（\\。）[0];
List< String []> list = new ArrayList< String []>（）;
//获取文件
br = new BufferedReader（new InputStreamReader（inputStream））; //获取对象读取文件
String line; $（b行b = br.readLine（））！=空）{//条件结束，然后到达文件的结尾。
list.add（line.split（，））;
//检查文件是否为空
if（list.size（）== 0）{
System.err.println（File Empty）;
} else {
// TODO：Parameter Parser。
//请在这里执行
$ b $ catch（FileUploadException e）{
// TODO自动生成的catch块
e.printStackTrace（ ）;
$ b我的代码并没有给出任何编程错误，但它不会通过 CheckPoint 2 ，也就是说它不会进入而循环。我试图找到各种职位，如：
$ b 保持上传时的目录结构
这个问题工程选择文件夹中的多个文件，这里的问题是问题是上传文件夹中的不同子目录中的文件。
我想知道，如果这是可能的只使用 java servlets 不使用 javascript 。我能够在一个文件夹中上传多个文件。但是，当我选择一个文件夹作为输入时，代码似乎不起作用，而是在我选择一个特定的文件或文件的一个子集时起作用。 方法
HTML文件格式
< form onsubmit =readFiles（）>
< input type =filename =fileswebkitdirectory directory multiple id =files>
< input type =submit>
< / form>
JavaScript函数
function readFiles（）{
var files = document.getElementById（files）。files; （var file = 0; file< files.length; file ++）{
var reader = new FileReader（）;
reader.onload = function（e）{
var object = new Object（）;
object.content = e.target.content;
var json_upload =jsonObject =+ JSON.stringify（object）;
var xmlhttp = new XMLHttpRequest（）; //新的HttpRequest实例
xmlhttp.open（POST，http：// localhost：8080 / readFileServlet）;
xmlhttp.setRequestHeader（Content-Type，application / x-www-form-urlencoded）;
xmlhttp.send（json_upload）;
}
reader.readAsBinaryString（files）;
$ b $ p $ Java $函数
JSONObject jObj = new JSONObject（request.getParameter（jsonObject））;
I am trying to implement a file-upload functionality using webkitdirectory with java backend.
Step1. Design a HTML form with webkitdirectory
<form action="DataUpload" method="post" enctype="multipart/form-data">
<input type="text" name="dbName" value="Database Name Here" id="dbName"/>
<input type="file" id="ctrl" webkitdirectory directory multiple/>
<input type="submit" />
</form>
Step 2. Passing information from form to Servlet
public class DataUpload extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response){
ServletFileUpload upload = new ServletFileUpload();
FileItemIterator fileIterator;
try {
fileIterator = upload.getItemIterator(request);
InputStream inputStream = null;
BufferedReader br = null;
System.out.println("CheckPoint 1");
while(fileIterator.hasNext()) {
System.out.println("CheckPoint 2");
FileItemStream item = fileIterator.next();
String inputFileName = FilenameUtils.getName(item.getName());
inputStream = item.openStream();
inputFileName = inputFileName.split("\\.")[0];
List<String[]> list = new ArrayList<String[]>();
// Getting File
br = new BufferedReader(new InputStreamReader(inputStream)); // Getting the object to read file
String line;
while((line = br.readLine())!= null){// While condition ends then end of file is reached.
list.add(line.split(","));
}
// Checking if File is Empty
if (list.size() == 0){
System.err.println("File Empty");
}else{
// TODO : Parameter Parser.
// DO JOB HERE
}
}
} catch (FileUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
My code, doesn't give any programming error, but it does not pass through the CheckPoint 2, i.e. it doesn't go inside the while loop. I tried looking into various post, such as:
Keep Directory Structure When Uploading
How to upload files to server using JSP/Servlet? - While this question shows maximum resemblance to problem in question, This question works for selecting multiple files in a folder, where the problem here is question is to upload files in different sub directories inside a folder.
I was wondering, if this was possible using solely java servlets without using javascript. I was able to upload multiple files inside a single folder. But, code doesn't seem to work, when I select a folder as input, instead it works when I select a particular file or a subset of files.
解决方案 HTML File Form
<form onsubmit="readFiles()">
<input type="file" name="files" webkitdirectory directory multiple id="files">
<input type="submit">
</form>
JavaScript Function
function readFiles(){
var files = document.getElementById("files").files;
for (var file = 0 ; file < files.length; file++) {
var reader = new FileReader();
reader.onload = function(e){
var object = new Object();
object.content = e.target.content;
var json_upload = "jsonObject=" + JSON.stringify(object);
var xmlhttp = new XMLHttpRequest(); // new HttpRequest instance
xmlhttp.open("POST", "http://localhost:8080/readFileServlet");
xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xmlhttp.send(json_upload);
}
reader.readAsBinaryString(files);
}
}
Java Function:
JSONObject jObj = new JSONObject(request.getParameter("jsonObject"));
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