用于fileupload的BackGround图像 [英] BackGround image for fileupload
本文介绍了用于fileupload的BackGround图像的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
嗨专家
i希望代码为文件上传选项设置图像..我可以点击该图片打开浏览器选项..我怎么能这样做..
please helpme ..
谢谢和问候
Ch.Nagendra
解决方案
< blockquote>试试这个代码...... :)
-------------------------------- -------------------------------------------------- --------
index.jsp
----------------------- -------------------------------------------------- -----------------
< < span class =code-leadattribute> html >
< head >
< title > 向用户显示文件上传表单< / title >
< / head >
< body >
< 表格 enctype = multipart / form-data action = upload.jsp 方法 = POST >
< br >
< br >
< br >
< center >
< 表 border = 0 bgcolor = ＃ccFDDEE >
< tr >
< center >
< td colspan = 2 align = center > < b > 上传文件< / b >
< center >
< < span class =code-leadattribute> / center > < / td >
< < span class =code-leadattribute> / center > < / tr >
< < span class =code-leadattribute> tr >
< td colspan = 2 align = center > < / td >
< / tr >
< tr >
< td > < b > 选择要上传的文件：< / b > < / td >
< td > < 输入 名称 = file type = file > < / input > < / td >
< / tr >
< tr >
< td colspan = 2 align = center > < / td >
< / tr >
< tr >
< td colspan = 2 align = center > ; < 输入 类型 = 提交 >
value =发送文件> < / input > < / td >
< / tr >
< 表格 >
< / table > < / table > < / center >
< / br > < / br > < / br > < / form >
< / body >
< / html >
--------- -------------------------------------------------- -----------------------------
upload.jsp
-------------------------------------------- ---------------------------------------------
< ！[CDATA [<％@ page import = java.io。* ％ > ]]>
< ！[CDATA [<％
字符串 saveFile = ;
字符串 contentType = request.getContentType（）;
如果 （ （contentType ！ = null） && （contentType.indexOf（multipart / form-data） > ; = 0））{
DataInputStream in = new DataInputStream（request.getInputStream（））;
int formDataLength = request.getContentLength（）;
byte dataBytes [] = new byte [formDataLength];
int byteRead = 0;
int totalBytesRead = 0;
while（totalBytesRead < formDataLength） {
byteRead = in.read（dataBytes， totalBytesRead， formDataLength）;
< span class =code-attribute> totalBytesRead + = byteRead;
}
字符串 file = new String（dataBytes）;
saveFile = file.substring（file.indexOf（ filename = \ ） + 10）;
saveFile = saveFile.substring（0， saveFile.indexOf（\ n））;
< span class =code-attribute> saveFile = < span class =code-keyword> saveFile.substring（saveFile.lastIndexOf（ \\） + 1， saveFile.indexOf （\））;
< span class =code-attribute> int lastIndex = contentType.lastIndexOf（ = ）;
String boundary = contentType.substring（lastIndex + 1，contentType.length（））;
int pos;
pos = file.indexOf（ filename = \ ）;
< span class =code-attribute> pos = file.indexOf（ \ n， pos） + 1;
pos = file.indexOf（ \ n， pos） + 1;
pos = file.indexOf（ \ n， pos） + 1;
int boundaryLocation = file.indexOf（boundary， pos） - 4;
< span class =code-attribute> int startPos = （（file.substring（0， pos））。getBytes（））。length;
< span class =code-attribute> int endPos = （（file.substring（ 0， boundaryLocation））。getBytes（））。length;
< span class =code-attribute>
saveFile = C：/ himanshu / + saveFile;
文件 ff = new 文件（saveFile）;
< span class =code-attribute> FileOutputStream fileOut = < span class =code-keyword> new FileOutputStream（ff）;
fileOut.write （dataBytes， startPos， （endPos - startPos））;
< span class =code-attribute> fileOut.flush（）;
fileOut.close();
%>]]><br>
<table border=\"2\">
<tr>
<td><b>You have successfully upload the file by the name of:</b>
<%
out.println(saveFile);
}
%>
</td>
</tr>
</table>
-----------------------------------------------------------------------------------------
Hi experts
i want code for to set an image for file-upload option.. i can click that image it opens browser option.. how can i do that..
please helpme..
Thanks and Regards
Ch.Nagendra
解决方案
Try this code... :)
------------------------------------------------------------------------------------------
index.jsp
------------------------------------------------------------------------------------------
<html> <head> <title>Display file upload form to the user</title> </head> <body> <form enctype="multipart/form-data" action="upload.jsp" method="POST"> <br> <br> <br> <center> <table border="0" bgcolor="#ccFDDEE"> <tr> <center> <td colspan="2" align="center"><b>UPLOAD THE FILE</b> <center> </center></td> </center></tr> <tr> <td colspan="2" align="center"></td> </tr> <tr> <td><b>Choose the file To Upload:</b></td> <td><input name="file" type="file"></input></td> </tr> <tr> <td colspan="2" align="center"></td> </tr> <tr> <td colspan="2" align="center"><input type="submit"> value="Send File"></input></td> </tr> <table> </table></table></center> </br></br></br></form> </body> </html>
----------------------------------------------------------------------------------------
upload.jsp
-----------------------------------------------------------------------------------------
<![CDATA[<%@ page import="java.io.*"%>]]> <![CDATA[<% String saveFile = ""; String contentType = request.getContentType(); if ((contentType != null) && (contentType.indexOf("multipart/form-data") >= 0)) { DataInputStream in = new DataInputStream(request.getInputStream()); int formDataLength = request.getContentLength(); byte dataBytes[] = new byte[formDataLength]; int byteRead = 0; int totalBytesRead = 0; while (totalBytesRead < formDataLength) { byteRead = in.read(dataBytes, totalBytesRead, formDataLength); totalBytesRead += byteRead; } String file = new String(dataBytes); saveFile = file.substring(file.indexOf("filename=\"") + 10); saveFile = saveFile.substring(0, saveFile.indexOf("\n")); saveFile = saveFile.substring(saveFile.lastIndexOf("\\") + 1, saveFile.indexOf("\"")); int lastIndex = contentType.lastIndexOf("="); String boundary = contentType.substring(lastIndex + 1, contentType.length()); int pos; pos = file.indexOf("filename=\""); pos = file.indexOf("\n", pos) + 1; pos = file.indexOf("\n", pos) + 1; pos = file.indexOf("\n", pos) + 1; int boundaryLocation = file.indexOf(boundary, pos) - 4; int startPos = ((file.substring(0, pos)).getBytes()).length; int endPos = ((file.substring(0, boundaryLocation)).getBytes()).length; saveFile = "C:/himanshu/" + saveFile; File ff = new File(saveFile); FileOutputStream fileOut = new FileOutputStream(ff); fileOut.write(dataBytes, startPos, (endPos - startPos)); fileOut.flush(); fileOut.close(); %>]]><br> <table border="2"> <tr> <td><b>You have successfully upload the file by the name of:</b> <% out.println(saveFile); } %> </td> </tr> </table>
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