我想用.jsp和servlet的图像上传mysql数据库中囤积的详细信息，但是当我调用我的servlet时，它给出了一个空白页..
我的.jsp
<form action="HoardingProfile" method="post" enctype="multipart/form-data">
<table style="height: 100%; width:100%;">
<tr style="height: 10%;">
<td class="tdleft" style="width: 50%;">
<h3>Location</h3>
</td>
<td style="width: 50%;">
<input type="text" class="tx bk" name="txtLocation"
placeholder="Location" required="yes">
</td>
</tr>
<tr style="height: 02%">
<td>
</td>
</tr>
<tr style="height: 10%;">
<td class="tdleft" style="width: 50%;">
<h3>Size</h3>
</td>
<td class="padd10" style="width: 50%;">
<input class="tx bk" type="text" name="txtSize" placeholder="Size"
required="yes">
</td>
</tr>
<tr style="height: 02%">
<td>
</td>
</tr>
<tr style="height: 10%;">
<td class="tdleft" style="width: 50%;">
<h3>Owner Name</h3>
</td>
<td style="width: 50%;">
<input type="text" class="tx bk" placeholder="Owner Name"
required="yes" name="txtName">
</td>
</tr>
<tr style="height: 02%">
<td>
</td>
</tr>
<tr style="height: 10%;">
<td class="tdleft" style="width: 50%;">
<h3>Contact No.</h3>
</td>
<td style="width: 50%;">
<input type="text" class="tx bk" placeholder="Number"
required="yes" name="txtNumber">
</td>
</tr>
<tr style="height: 02%">
<td>
</td>
</tr>
<tr style="height: 10%;">
<td class="tdleft" style="width: 50%;">
<h3>Address</h3>
</td>
<td style="width: 50%;">
<textarea class="tx bk2" placeholder="Address" required="yes"
name="txtAddress"></textarea>
</td>
</tr>
<tr style="height: 02%">
<td>
</td>
</tr>
<tr style="height: 15%;">
<td class="tdleft" style="width: 50%;">
<h3>Picture</h3>
</td>
<td style="width: 50%;">
<input type="file" name="file" id="file">
</td>
</tr>
<tr style="height: 02%">
<td>
</td>
</tr>
<tr style="height: 10%;">
<td class="tdleft" style="width: 50%;">
<h3>Google map</h3>
</td>
<td style="width: 50%;">
<textarea class="tx bk2" placeholder="Google Map iframe"
name="txtMap"></textarea>
</td>
</tr>
<tr style="height: 02%">
<td>
</td>
</tr>
<tr style="height: 10%;">
<td class="tdleft" style="width: 80%;">
<input class="btn" type="submit" name="Add" value="Save"
</td>
<td style="width: 20%;">
<input class="btn" type="reset" value="Reset"
</td>
</tr>
</table>
</form>
和我的 servlet
PrintWriter out = response.getWriter();
try {
// Apache Commons-Fileupload library classes
DiskFileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload sfu = new ServletFileUpload(factory);
if (! ServletFileUpload.isMultipartContent(request)) {
System.out.println("Sorry. No file uploaded");
return;
}
// parse request
List<FileItem> items = sfu.parseRequest(request);
out.print(items);
FileItem txtLocation = (FileItem) items.get(0);
String location = txtLocation.getString();
out.println(location);
FileItem txtSize = (FileItem) items.get(1);
String size = txtSize.getString();
out.println(size);
FileItem txtName = (FileItem) items.get(2);
String name = txtName.getString();
out.println(name);
FileItem txtNumber = (FileItem) items.get(3);
String number = txtNumber.getString();
out.println(number);
FileItem txtAddress = (FileItem) items.get(4);
String address = txtAddress.getString();
out.println(address);
// get uploaded file
FileItem file = (FileItem) items.get(5);
// Connect to Oracle
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/opm?zeroDateTimeBehavior=convertToNull","root","");
con.setAutoCommit(false);
PreparedStatement ps = con.prepareStatement("insert into hprofile(location,size,owner,address,phone,deleted,img) values(?,?,?,?,?,?,?)");
ps.setString(1, location);
ps.setString(2, size);
ps.setString(3, name);
ps.setString(4, number);
ps.setString(5, address);
// size must be converted to int otherwise it results in error
ps.setBinaryStream(6, file.getInputStream(), (int) file.getSize());
ps.executeUpdate();
con.commit();
con.close();
out.println("Proto Added Successfully. <p> <a href='listphotos'>List Photos </a>");
}
catch(Exception ex) {
out.println( "Error --> " + ex.getMessage());
}
finally {
out.close();
}