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我用JavaScript以下形式將文件上載到服務器：爲什麼我無法在服務器端正確獲取formdata？
<h1>Upload Font</h1>
<form id="add" name="add" action="/font/add" method="POST" enctype="multipart/form-data">
<div class="dialog">
<table>
<tbody>
<tr class="prop">
<td valign="top" class="name required">
<label for="description">Font Description:</label>
</td>
<td valign="top">
<input type="text" name="font.description" size="44" value="" id="name"/>
</td>
</tr>
<tr class="prop">
<td valign="top" class="name required">
<label for="description">Font File:</label>
</td>
<td valign="top">
<input type="file" name="file" size="62" value="" id="fname" onchange="fileUpload('/pages/font/getFontTitle.jsp',value,this.files[0])"/>
</td>
</tr>
<tr class="prop">
<td>
<span class="button"><div align="right" id="wwctrl_add_0"><input type="submit" id="add_0" value="Submit"/></div></span>
</td>
</tr>
</tbody>
</table>
</div>
</form>
<script type="text/javascript">
function fileUpload(url,fileName,fileData)
{
try
{
var fileSize=fileData.size;
alert('fileSize : '+fileSize);
if (window.XMLHttpRequest) xmlhttp=new XMLHttpRequest(); // code for IE7+, Firefox, Chrome, Opera, Safari
else xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); // code for IE6, IE5
xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) document.getElementById('name').value=xmlhttp.responseText; }
xmlhttp.open("POST",url,true);
var formdata=new FormData();
formdata.append('fileName',fileName);
formdata.append('file',fileData);
xmlhttp.send(formdata);
}
catch(e) { alert(e.message); }
}
</script>
我在服務器端這個樣子的程序getFontTitle.jsp：
<%@ page import="java.io.*" %>
<%@ page import="java.awt.*" %>
<%
String contentType=request.getContentType(),Location="0.", // To get the content type information from JSP Request Header
fontAttributes="",fontTitle="";
System.out.println("contentType = "+contentType);
if ((contentType!=null) && (contentType.indexOf("multipart/form-data")>=0)) // Here we are checking the content type is not equal to Null and as well as the passed data from mulitpart/form-data is greater than or equal to 0
{
Location+="1.";
try
{
DataInputStream in=new DataInputStream(request.getInputStream());
int formDataLength=request.getContentLength(); // We are taking the length of Content type data
byte dataBytes[]=new byte[formDataLength];
int byteRead=0;
int totalBytesRead=0;
while (totalBytesRead<formDataLength) // This loop converting the uploaded file into byte code
{
byteRead=in.read(dataBytes,totalBytesRead,formDataLength);
totalBytesRead+=byteRead;
}
System.out.println("dataBytes : "+dataBytes.length+"\n"+dataBytes.toString());
String file=new String(dataBytes);
System.out.println("file = \n"+file);
System.out.println("file.length = "+file.length());
System.out.println("file.indexOf(filename=) = "+file.indexOf("filename=\""));
String saveFile=file.substring(file.indexOf("filename=\"")+10); // For saving the file name
Location+="2.";
saveFile=saveFile.substring(0,saveFile.indexOf("\n"));
System.out.println("saveFile = "+saveFile);
Location+="3.";
saveFile=saveFile.substring(saveFile.lastIndexOf("\\")+1,saveFile.indexOf("\""));
Location+="4.";
int lastIndex=contentType.lastIndexOf("=");
Location+="5.";
String boundary=contentType.substring(lastIndex+1,contentType.length());
System.out.println(" boundary = "+boundary);
int pos;
Location+="6.";
pos=file.indexOf("filename=\""); // Extracting the index of file
Location+="7.";
pos=file.indexOf("\n",pos)+1;
pos=file.indexOf("\n",pos)+1;
pos=file.indexOf("\n",pos)+1;
Location+="8.";
int boundaryLocation=file.indexOf(boundary,pos)-4;
System.out.println(" boundaryLocation = "+boundaryLocation+" filename = "+file.indexOf("filename=\""));
int startPos=((file.substring(0,pos)).getBytes()).length;
int endPos=((file.substring(0,boundaryLocation)).getBytes()).length;
System.out.println(" startPos = "+startPos+" , endPos = "+endPos);
Location+="9.";
File f=new File(saveFile);
FileOutputStream fileOut=new FileOutputStream(f);
// fileOut.write(dataBytes,startPos,(endPos-startPos));
fileOut.write(dataBytes);
fileOut.flush();
fileOut.close();
Location+="a.";
// System.out.println("================================\nstartPos = "+startPos+" , endPos = "+endPos+"\nf = "+f+"\nf.getAbsolutePath() = "+f.getAbsolutePath()+"\n\n=== contentType ===\n\n"+contentType+"\n\n=== file ===\n\n"+file+"\n================================");
// out.println(f+"<Br>"+file);
Location+="b.";
Font createdFont=Font.createFont(Font.TRUETYPE_FONT,new FileInputStream(f));
Location+="c.";
// System.out.println(createdFont);
Location+="d.";
fontAttributes=createdFont.getAttributes().toString(); // map of {family="A.C.M.E. Explosive Bold", weight=1.0*, width=1.0*, posture=0.0*, size=1.0, transform=null*, superscript=0*, tracking=0.0*[btx=null, ctx=null]}
System.out.println(fontAttributes);
fontTitle=fontAttributes.substring(fontAttributes.indexOf("\"")+1,fontAttributes.lastIndexOf("\""));
out.println(fontTitle);
Location+="e.";
// out.println("Done : "+saveFile);
}
catch (Exception e) { e.printStackTrace(); }
Location+="f.";
}
else if (contentType==null) out.println("Not a valid file");
out.println(" [ "+Location+" ]");
out.flush();
%>
The output look like this : [ 0.1.2.f. ]
There is error on line : saveFile=saveFile.substring(0,saveFile.indexOf("\n"));
There is no index of saveFile.indexOf("\n")
What did I do wrong ? Maybe it's not getting the data in the correct format ?
====== ====================================
我已經更改了代碼以使用FileUpload，它看起來像這樣：
<%
String contentType=request.getContentType(),Location="0.", // To get the content type information from JSP Request Header
fontAttributes="",fontTitle="";
out.println("Done");
System.out.println("contentType = "+contentType);
boolean isMultipart=ServletFileUpload.isMultipartContent(request); // Check that we have a file upload request
System.out.println("isMultipart = "+isMultipart);
FileItemFactory factory=new DiskFileItemFactory(); // Create a factory for disk-based file items
ServletFileUpload upload=new ServletFileUpload(factory); // Create a new file upload handler
List /* FileItem */ items=upload.parseRequest(request); // Parse the request
Iterator iter=items.iterator(); // Process the uploaded items
while (iter.hasNext())
{
FileItem item=(FileItem) iter.next();
if (item.isFormField()) // Process a regular form field
{
String name=item.getFieldName();
String value=item.getString();
System.out.println("name = "+name+" value = "+value);
}
else
{
String fieldName = item.getFieldName();
String fileName = item.getName();
contentType = item.getContentType();
boolean isInMemory = item.isInMemory();
long sizeInBytes = item.getSize();
System.out.println("isInMemory = "+isInMemory+" sizeInBytes = "+sizeInBytes);
}
}
if ((contentType!=null) && (contentType.indexOf("multipart/form-data")>=0)) // Here we are checking the content type is not equal to Null and as well as the passed data from mulitpart/form-data is greater than or equal to 0
{
Location+="1.";
try
{
DataInputStream in=new DataInputStream(request.getInputStream());
int formDataLength=request.getContentLength(); // We are taking the length of Content type data
byte dataBytes[]=new byte[formDataLength];
int byteRead=0;
int totalBytesRead=0;
while (totalBytesRead<formDataLength) // This loop converting the uploaded file into byte code
{
byteRead=in.read(dataBytes,totalBytesRead,formDataLength);
totalBytesRead+=byteRead;
}
System.out.println("dataBytes : "+dataBytes.length+"\n"+dataBytes.toString());
....
}
catch (Exception e) { e.printStackTrace(); }
Location+="f.";
}
else if (contentType==null) out.println("Not a valid file");
out.println(" [ "+Location+" ]");
out.flush();
%>
輸出是：
contentType = multipart/form-data; boundary=---------------------------184228830106
isMultipart = true
dataBytes : 35918
[[email protected]
file =
file.length = 35918
file.indexOf(filename=) = -1
你正確讀取該文件？ – MaVRoSCy
你使用什麼Servlet版本？ 2.0還是3.0？ – MaVRoSCy
我會建議你閱讀http://stackoverflow.com/questions/3337056/convenient-way-to-parse-incoming-multipart-form-data-parameters-in-a-servlet，更具體地使用http：// commons.apache.org/fileupload/using.html – MaVRoSCy