将值从Servlet传递到JSP

Question

我正在尝试将某些值从servlet传递到JSP页面，并添加已传递到标记的值，阅读了许多文章，我得到了以下代码。

1. 使用输入页面选择文件
2. 验证上传的文件
3. 调用上传。java将上传的文件保存在WEB-INF中
4. 在上载的文件中，选定的文件保存为“我的”。txt
5. 使用缓冲区读取文件内容并将其保存到变量
6. 将其传递到JSP页面

上载JAVA

上传文件后，

response.setContentType("text/html");
String LINE = "<br>";
String filename = "/WEB-INF/my.txt";
fileTxt = "";
ServletContext context = getServletContext();
InputStream is = context.getResourceAsStream(filename);
if (is != null) {
InputStreamReader isr = new InputStreamReader(is);
BufferedReader reader = new BufferedReader(isr);
PrintWriter writer = response.getWriter();
String text = "";
while ((text = reader.readLine()) != null) {
fileTxt = text + LINE;
}
request.setAttribute("File_Text", fileTxt);
RequestDispatcher rd = request.getRequestDispatcher("mypage.jsp");
rd.forward(request, response);

}

mypage.jsp

<div id="editor"></div>

<form method="post" name="myform" action="upload" target="_blank" enctype="multipart/form-data" style="position: absolute; right: -5%; top: 2%;">
 Left File :     <input type="file" name="dataFile1" id="fileChooser1" /><br><br>
 Right File : <input type="file" name="dataFile2" id="fileChooser2" /><br><br>
 Config File :<input type="file" name="dataFile3" id="fileChooser3" /><br><br>
<button type="button" onclick="ValidateFile()">Click to Upload files</button>
</form>
<script type='text/javascript'>

function ValidateFile()
{
var FileName1 = document.getElementById('fileChooser1').value;
var FileName2 = document.getElementById('fileChooser2').value;
var FileName3 = document.getElementById('fileChooser3').value;

if(FileName1.length == 0 && FileName2.length == 0 && FileName3.length == 0)
{
    alert("No files have been selected to upload"); 
}

else
{
if(FileName1 == FileName3 ||  FileName2 == FileName3)
    {
        alert("Configuration file should not be same as left or right files. Please check your uploads");
    }
else
    {
        document.myform.submit();
    }

var filecontent =   ${File_Text};
var divv = document.getElementById("editor");
divv.innerHTML = filecontent;

}
}
</script>

现在，当我点击上传按钮完成所有这些之后，它就不起作用了，点击根本无法被识别，但是当我删除文件访问代码时，按钮就可以正常工作了。。

1. 为什么会这样？怎么办？
2. 这是访问JSP中servlet值的正确方法吗？

==========================================================编辑=======================================

只是为了进一步澄清事情，

1. 用户上传文件
2. 该文件保存为我的。txt
3. 我正在打开这个文件，阅读它的内容
4. 将这些内容添加到我的ACE编辑器中

Answer 1

试试这个：

while ((text = reader.readLine()) != null) {
fileTxt = text + LINE;
}
request.setAttribute("File_Text", fileTxt);
RequestDispatcher rd = request.getRequestDispatcher("mypage.jsp");    
rd.forward(request, response);                                            

Answer 2

Upload.java没有变化

 <div id="editor">${File_Text}</div>

<form method="post" name="myform" action="upload" target="_blank" enctype="multipart/form-data" style="position: absolute; right: -5%; top: 2%;">
 Left File :     <input type="file" name="dataFile1" id="fileChooser1" /><br><br>
 Right File : <input type="file" name="dataFile2" id="fileChooser2" /><br><br>
 Config File :<input type="file" name="dataFile3" id="fileChooser3" /><br><br>
<button type="button" onclick="ValidateFile()">Click to Upload files</button>
</form>
<script type='text/javascript'>

function ValidateFile()
{
var FileName1 = document.getElementById('fileChooser1').value;
var FileName2 = document.getElementById('fileChooser2').value;
var FileName3 = document.getElementById('fileChooser3').value;

if(FileName1.length == 0 && FileName2.length == 0 && FileName3.length == 0)
{
    alert("No files have been selected to upload"); 
}

else
{
if(FileName1 == FileName3 ||  FileName2 == FileName3)
    {
        alert("Configuration file should not be same as left or right files. Please check your uploads");
    }
else
    {
        document.myform.submit();
    {

}
}
</script>