1.JSP ä¸ä¼ ä¸è½½ä»£ç
2.jspç®åä¸ä¼ 代ç
3.我刚刚学jsp,文文件请问为什么FileUpload显示不出“上传的传源庄股起爆指标源码文件为:”和“保存的地址为:”下面是FileUpload的代
JSP ä¸ä¼ ä¸è½½ä»£ç
æç»ä½ æï¼
1.é¦å ä¸è¿ä¸¤ä¸ªå commons-fileupload-1.2.1.jarï¼commons-io-1.3.2.jar
2.ç¼ååå°é¡µé¢
<%@ page language="java" pageEncoding="gbk"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4. Transitional//EN">
<html>
<body>
<form action="<%=request.getContextPath()%>/UploadServlet" method="post" enctype="multipart/form-data">
username:<input type="text" name="username"><br>
password:<input type="password" name="password"><br>
file:<input type="file" name="file"><br>
<input type="submit" value="submit"><br>
</form>
</body>
</html>
3.ç¼åservlet
package cn.jci.upload.servlet;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet..jci.upload.servlet.UploadServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>UploadServlet</servlet-name>
<url-pattern>/UploadServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
5.åå¸
okäº
è¿æ¯æåå§çä¸ä¼ æ件çåæ³ï¼ç°å¨struts2ä¸ä¼ çè¯ï¼å°±è¦è½»æ¾å¥½å¤
jspç®åä¸ä¼ 代ç
servletæ件ä¸ä¼
login.jsp
<%@ page language="java" contentType="text/html; charset=gbk"
pageEncoding="gbk"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4. Transitional//EN" ".test.servlet;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.mons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class UploadServlet extends HttpServlet {
public UploadServlet() {
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String path = request.getSession().getServletContext().getRealPath("/upload");
DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setRepository(new File(path));
factory.setSizeThreshold( * );
ServletFileUpload upload = new ServletFileUpload(factory);
try
{
List<FileItem>list = upload.parseRequest(request);
for(FileItem item:list){
if(item.isFormField()){
String name = item.getFieldName();
String value = item.getString("utf-8");
request.setAttribute(name, value);
}
else{
String name = item.getFieldName();
String value = item.getName();
int start = value.lastIndexOf("\\");
String fileName = value.substring(start+1);
request.setAttribute(name, fileName);
System.out.println(fileName);
OutputStream os = new FileOutputStream(new File(path,fileName));
InputStream is = item.getInputStream();
byte[] buffer = new byte[];
int length = 0;
while((length = is.read(buffer))>0){
os.write(buffer,0,length);
}
os.close();
is.close();
}
}
}
catch(Exception e){
e.printStackTrace();
}
request.getRequestDispatcher("/result.jsp").forward(request, response);
}
}
Strutsæ件ä¸ä¼
1.å建ä¸ä¸ªå·¥ç¨ï¼
å建ä¸ä¸ªJSP页é¢å 容å¦ä¸ï¼
<body>
<form action="uploadAction.do" method="post" enctype="multipart/form-data" >
<input type="file" name="file">
<input type="submit">
</form>
</body>
2.å建ä¸ä¸ªFormBean继æ¿ActionForm
å ¶ä¸æ个private FormFile file ;å±æ§ãFormFileç±»çå ¨å为ï¼org.apache.struts.upload.FormFile
3.å建ä¸ä¸ªUploadAction继æ¿èªAction
ç¶åéåActionçexecute()æ¹æ³ï¼
代ç å¦ä¸ï¼
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
UploadForm uploadForm = (UploadForm) form;
if(uploadForm.getFile()!=null)
FileUtil.uploadFile(uploadForm.getFile(), "e:/abc/accp");
return null;
}
4.å建FileUtilå·¥å ·ç±»ï¼éé¢å®ç°ä¸ä¼ çæ件çæ¹æ³ï¼
å ³é®ä»£ç å¦ä¸ï¼
public class FileUtil
{
/*** å建空ç½æ件
* @param fileName æ件å
* @param dir ä¿åæ件çç®å½
* @return
*/
private static File createNewFile(String fileName,String dir)
{
File dirs = new File(dir);
//çæ件夹æ¯å¦åå¨ï¼å¦æä¸åå¨æ°å»ºç®å½
if(!dirs.exists())
dirs.mkdirs();
//æ¼åæ件å®æè·¯å¾
File file = new File(dir+File.separator+fileName);
try {
//å¤ææ¯å¦æååååï¼å¦ææååæ件å éæºæ°æ¹åæ件å
while(file.exists()){
int ran = getRandomNumber();
String prefix = getFileNamePrefix( fileName);
String suffix = getFileNameSuffix( fileName);
String name = prefix+ran+"."+suffix;
file = new File(dir+File.separator+name);
}
file.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return file;
}
/
*** è·å¾éæºæ°
* @return
*/
private static int getRandomNumber() {
Random random = new Random(new Date().getTime());
return Math.abs(random.nextInt());
}
/
*** åå²æ件å å¦a.txt è¿å a
* @param fileName
* @return
*/
private static String getFileNamePrefix(String fileName){
int dot = fileName.lastIndexOf(".");
return fileName.substring(0,dot);
}
/
*** è·å¾æ件åç¼
* @param fileName
* @return
*/
private static String getFileNameSuffix(String fileName) {
int dot = fileName.lastIndexOf(".");
return fileName.substring(dot+1);
}
/
*** ä¸ä¼ æ件
* @param file
* @param dir
* @return
*/
public static String uploadFile(FormFile file,String dir)
{
//è·å¾æ件å
String fileName = file.getFileName();
InputStream in = null;
OutputStream out = null;
try
{
in = new BufferedInputStream(file.getInputStream());//æé è¾å ¥æµ
File f = createNewFile(fileName,dir);
out = new BufferedOutputStream(new FileOutputStream(f));//æé æ件è¾åºæµ
byte[] buffered = new byte[];//è¯»å ¥ç¼å
int size =0;//ä¸æ¬¡è¯»å°ççå®å¤§å°
while((size=in.read(buffered,0,))!=-1)
{
out.write(buffered,0,size);
}
out.flush();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
finally
{
try {
if(in != null) in.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
if(out != null) out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
}
我刚刚学jsp,请问为什么FileUpload显示不出“上传的上传桌面气泡源码文件为:”和“保存的地址为:”下面是FileUpload的代
jsp上传下载原理是服务器通过http请求获得文件的数据流,然后分析数据流,源码新手阅读源码提取出文件的文文件高级网站源码控制信息,最后得到与原文件一样的传源算法源码大全数据文件并存储。
但这样,上传工作量很大。源码
可以采用jspSmartUpload包。文文件
传源一个例子:
传源<!DCTYPE HTML PUBLIC "-//W3C//DTD HTML 4. Transitional//EN">
传源<html>
传源<head>
传源<title>文件上传</title>
传源<meta http-equiv="content-type" content="text/html; charset=gb" >
传源<script language="javascript">
传源function sub(){
传源document.myform.submit();
传源}
传源</script>
传源</head>
传源<body>
传源<p> </p>
传源<p align="center">上传信息输入</p>
传源<form name="myform" method="post" action="do_upload.jsp" enctype="multipart/form-data">
传源<table width="%" border="1" align="center">
传源<tr>
传源<td><div align="left"> 上传源文件:
传源<input type="file" name="file2" size="">
传源</div></td>
传源</tr>
传源<tr>
传源<td>上传后文件名:
传源<input type="text" name="title" size="" ></td>
传源</tr>
传源<tr>
传源<td colspan="2"> <div align="center">
传源<input type="button" name="submit" value="提交" onClick="sub()" >
传源</div></td>
传源</tr>
传源</table>
传源</form>
传源</body>
传源</html>
传源