- 浏览: 250864 次
- 性别:
- 来自: 厦门
文章分类
最新评论
-
shootboss:
可以,mark学习
Freemarker页面语法 -
java_cache:
好东西,果断收藏!
Freemarker页面语法 -
fireinjava:
${.global.x}改为${.globals.x} :) ...
Freemarker页面语法 -
贾志新:
good
Freemarker页面语法 -
贾志新:
sasasa
Freemarker页面语法
对于实现文件上传功能来说,Commons-fileupload组件是一个不错的选择,本文使用它实现了单个文件及多个文件上传,这里将实现过程写出来与大家共享。
1.单个文件上传。
页面代码:
<!-- <br />
<br />
Code highlighting produced by Actipro CodeHighlighter (freeware)<br />
http://www.CodeHighlighter.com/<br />
<br />
-->
.... < div id ="content" >
< fieldset >< legend > 下載列表 </ legend >
< ul >
<%
List < String > downloadList = (List < String > )request.getAttribute( " downloadList " );
if (downloadList! = null ){
for ( String str:downloadList){
out.print( " <li><a href='DownloadFile?file= " + str + " '> " + str + " </a></li> " );
}
}
%>
</ ul >
</ fieldset >
<!-- enctype属性为表单定义了MIME编码方式,上传文件的表单enctype属性必须如此设置 -->
< form method ="post" action ="UploadFile" enctype ="multipart/form-data" >
< p >< input type ="text" name ="fileIntro" value ="" /> 文件介绍 </ p >
< p >< input type ="file" name ="myfile1" value ="浏览文件" /></ p >
< p >< input type ="submit" value ="上传" /></ p >
</ form >
</ div >....
.... < div id ="content" >
< fieldset >< legend > 下載列表 </ legend >
< ul >
<%
List < String > downloadList = (List < String > )request.getAttribute( " downloadList " );
if (downloadList! = null ){
for ( String str:downloadList){
out.print( " <li><a href='DownloadFile?file= " + str + " '> " + str + " </a></li> " );
}
}
%>
</ ul >
</ fieldset >
<!-- enctype属性为表单定义了MIME编码方式,上传文件的表单enctype属性必须如此设置 -->
< form method ="post" action ="UploadFile" enctype ="multipart/form-data" >
< p >< input type ="text" name ="fileIntro" value ="" /> 文件介绍 </ p >
< p >< input type ="file" name ="myfile1" value ="浏览文件" /></ p >
< p >< input type ="submit" value ="上传" /></ p >
</ form >
</ div >....
在上传表单中,既有普通文本域也有文件上传域,注意在Servlet中取它们和平常的做法不同:
Servlet代码:
<!-- <br />
<br />
Code highlighting produced by Actipro CodeHighlighter (freeware)<br />
http://www.CodeHighlighter.com/<br />
<br />
-->package
com.sitinspring.action;
import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import com.sitinspring.util.UploadUtil;
/**
* 用于文件上传处理的Servlet
* @author sitinspring
*
* @date 2008-2-12
*/
public class UploadFileServlet extends HttpServlet {
private static final long serialVersionUID = 56890894234786L ;
@SuppressWarnings( " unchecked " )
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
request.setCharacterEncoding( " UTF-8 " );
// 文件上傳部分
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if (isMultipart == true ) {
try {
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
// 得到所有的表单域,它们目前都被当作FileItem
List < FileItem > fileItems = upload.parseRequest(request);
Iterator < FileItem > iter = fileItems.iterator();
// 依次处理每个表单域
while (iter.hasNext()) {
FileItem item = (FileItem) iter.next();
if (item.isFormField()){
// 如果item是正常的表单域
String name = item.getFieldName();
String value = item.getString();
System.out.print( " 表单域名为: " + name + " 表单域值为: " + value);
}
else {
// 如果item是文件上传表单域
// 获得文件名及路径
String fileName = item.getName();
if (fileName != null ) {
File fullFile = new File(item.getName());
// 如果文件存在则上传
if (fullFile.exists()){
File fileOnServer = new File(UploadUtil.getUploadPath(),
fullFile.getName());
item.write(fileOnServer);
System.out.println( " 文件 " + fileOnServer.getName() + " 上传成功 " );
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
} else {
System.out.println( " the enctype must be multipart/form-data " );
}
// 取得服务器中已有文件的下載列表
List < String > fileListInServer = new ArrayList < String > ();
File dir = new File(UploadUtil.getUploadPath());
String[] children = dir.list();
if (children != null ) {
for ( int i = 0 ; i < children.length; i ++ ) {
fileListInServer.add(children[i]);
}
}
request.setAttribute( " downloadList " , fileListInServer);
// 跳回原頁面
RequestDispatcher dispatcher = request
.getRequestDispatcher( " /web/page/uploadtoserver.jsp " );
dispatcher.forward(request, response);
return ;
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
doPost(request, response);
}
}
import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import com.sitinspring.util.UploadUtil;
/**
* 用于文件上传处理的Servlet
* @author sitinspring
*
* @date 2008-2-12
*/
public class UploadFileServlet extends HttpServlet {
private static final long serialVersionUID = 56890894234786L ;
@SuppressWarnings( " unchecked " )
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
request.setCharacterEncoding( " UTF-8 " );
// 文件上傳部分
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if (isMultipart == true ) {
try {
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
// 得到所有的表单域,它们目前都被当作FileItem
List < FileItem > fileItems = upload.parseRequest(request);
Iterator < FileItem > iter = fileItems.iterator();
// 依次处理每个表单域
while (iter.hasNext()) {
FileItem item = (FileItem) iter.next();
if (item.isFormField()){
// 如果item是正常的表单域
String name = item.getFieldName();
String value = item.getString();
System.out.print( " 表单域名为: " + name + " 表单域值为: " + value);
}
else {
// 如果item是文件上传表单域
// 获得文件名及路径
String fileName = item.getName();
if (fileName != null ) {
File fullFile = new File(item.getName());
// 如果文件存在则上传
if (fullFile.exists()){
File fileOnServer = new File(UploadUtil.getUploadPath(),
fullFile.getName());
item.write(fileOnServer);
System.out.println( " 文件 " + fileOnServer.getName() + " 上传成功 " );
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
} else {
System.out.println( " the enctype must be multipart/form-data " );
}
// 取得服务器中已有文件的下載列表
List < String > fileListInServer = new ArrayList < String > ();
File dir = new File(UploadUtil.getUploadPath());
String[] children = dir.list();
if (children != null ) {
for ( int i = 0 ; i < children.length; i ++ ) {
fileListInServer.add(children[i]);
}
}
request.setAttribute( " downloadList " , fileListInServer);
// 跳回原頁面
RequestDispatcher dispatcher = request
.getRequestDispatcher( " /web/page/uploadtoserver.jsp " );
dispatcher.forward(request, response);
return ;
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
doPost(request, response);
}
}
从上面的代码可以看出,无论是否文件上传表单域都被当成了FileItem来处理,要区别开来使用isFormField()方法即可,返回真是常规表单域,返回假则是文件上传表单域。
2.多个文件上传到服务器端。
这里采用JS动态生成几个文件上传表单域即可,Servlet无需改变。
多文件上传页面代码如下:
<!-- <br />
<br />
Code highlighting produced by Actipro CodeHighlighter (freeware)<br />
http://www.CodeHighlighter.com/<br />
<br />
--><%
@ page contentType
=
"
text/html; charset=UTF-8
"
%>
<% @page language = " java " import = " java.util.List " %>
<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
< html >
< head >
< title > 上传多個文件到服务器 </ title >
< meta http-equiv ="Content-Type" content ="text/html; charset=UTF-8" >
< link rel ="stylesheet" rev ="stylesheet" href ="web/css/style.css"
type ="text/css" />
</ head >
< body >
< div id ="bodyDiv" >
< div id ="header" >
< jsp:include page ="/web/page/branch/header.jsp" />
</ div >
< div id ="sidebar" >
< jsp:include page ="/web/page/branch/sidebar.jsp" />
</ div >
< div id ="content" >
< fieldset >< legend > 下載列表 </ legend >
< ul >
<%
List < String > downloadList = (List < String > )request.getAttribute( " downloadList " );
if (downloadList! = null ){
for ( String str:downloadList){
out.print( " <li><a href='DownloadFile?file= " + str + " '> " + str + " </a></li> " );
}
}
%>
</ ul >
</ fieldset >
<!-- enctype属性为表单定义了MIME编码方式,上传文件的表单enctype属性必须如此设置 -->
< form name ="uploadForm" method ="post" action ="UploadFile" enctype ="multipart/form-data" >
< p >< input type ="button" value ="增加上传按钮" onclick ="addUploadButton()" /></ p >
< p >< input type ="file" name ="myfile1" value ="浏览文件" /></ p >
< p >< input type ="submit" value ="上传" /></ p >
</ form >
</ div >
< div id ="footer" >
< jsp:include page ="/web/page/branch/footer.jsp" />
</ div >
</ div >
</ body >
<% @page language = " java " import = " java.util.List " %>
<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
< html >
< head >
< title > 上传多個文件到服务器 </ title >
< meta http-equiv ="Content-Type" content ="text/html; charset=UTF-8" >
< link rel ="stylesheet" rev ="stylesheet" href ="web/css/style.css"
type ="text/css" />
</ head >
< body >
< div id ="bodyDiv" >
< div id ="header" >
< jsp:include page ="/web/page/branch/header.jsp" />
</ div >
< div id ="sidebar" >
< jsp:include page ="/web/page/branch/sidebar.jsp" />
</ div >
< div id ="content" >
< fieldset >< legend > 下載列表 </ legend >
< ul >
<%
List < String > downloadList = (List < String > )request.getAttribute( " downloadList " );
if (downloadList! = null ){
for ( String str:downloadList){
out.print( " <li><a href='DownloadFile?file= " + str + " '> " + str + " </a></li> " );
}
}
%>
</ ul >
</ fieldset >
<!-- enctype属性为表单定义了MIME编码方式,上传文件的表单enctype属性必须如此设置 -->
< form name ="uploadForm" method ="post" action ="UploadFile" enctype ="multipart/form-data" >
< p >< input type ="button" value ="增加上传按钮" onclick ="addUploadButton()" /></ p >
< p >< input type ="file" name ="myfile1" value ="浏览文件" /></ p >
< p >< input type ="submit" value ="上传" /></ p >
</ form >
</ div >
< div id ="footer" >
< jsp:include page ="/web/page/branch/footer.jsp" />
</ div >
</ div >
</ body >
JS代码:
<!-- <br />
<br />
Code highlighting produced by Actipro CodeHighlighter (freeware)<br />
http://www.CodeHighlighter.com/<br />
<br />
--><
script LANGUAGE
=
"
JavaScript
"
>
<!--
var count = 1 ;
function addUploadButton(){
// 按ID找到FOrm
var uploadForm = document.getElementById( " uploadForm " );
// 创建P元素
var pNode = document.createElement( " p " );
// 累加Count以观察次数
count = count + 1 ;
pNode.innerHTML = " <input type='file' name='myfile " + count + " ' value='浏览文件'/> " ;
// 将P元素添加到body中
uploadForm.appendChild(pNode);
}
// -->
</ script >
</ html >
<!--
var count = 1 ;
function addUploadButton(){
// 按ID找到FOrm
var uploadForm = document.getElementById( " uploadForm " );
// 创建P元素
var pNode = document.createElement( " p " );
// 累加Count以观察次数
count = count + 1 ;
pNode.innerHTML = " <input type='file' name='myfile " + count + " ' value='浏览文件'/> " ;
// 将P元素添加到body中
uploadForm.appendChild(pNode);
}
// -->
</ script >
</ html >
评论
3 楼
眼镜蛇
2012-04-18
IE下可以使用,Firefox下不行,这是怎么回事
2 楼
眼镜蛇
2012-04-18
不知怎么回事,后台不报错,前台会报 Server (IO) Error。
1 楼
眼镜蛇
2012-04-18
Server (IO) Error
发表评论
-
Java文件路径(getResource)
2014-01-07 11:30 991Class.getResource("" ... -
java随记
2013-04-27 14:41 913ThreadLocal是为解决多线程程序的并发问题而提出的 ... -
JAVA内存使用--如何计算一个Java对象占用的字节数
2013-02-02 22:45 1969转载:http://blog.csdn.net ... -
一些得到classpath和当前类的绝对路径的方法
2013-02-01 14:54 1271一些得到classpath和当前类的绝对路径的一些方 ... -
位操作的学习总结
2012-10-09 10:18 1177^ 异或 相同为0,相异为1 & 与 ... -
深入研究java.lang.Class类
2012-08-15 11:35 2021http://winsystem.ctocio.com ... -
Jetty嵌入式开发提供WEB服务
2012-07-03 14:27 2323在Java开发的Project项目 ... -
深入Tomcat:JNDI在TOMCAT中的应用
2011-11-19 17:20 2105JNDI在TOMCAT中的应用 在J2EE应用中, ... -
java文件下载时文件名在ie和firefox下面表现不一致问题
2010-12-29 15:52 2173首先文件名是是以utf-8编码保存在数据库中,文件名暂定为&q ... -
Java反射学习
2010-06-03 14:22 1722全文摘抄于:http://iwtxokhtd.iteye.co ... -
java定时器的使用(Timer
2010-05-19 10:11 1557转载:http://www.cnblogs.com/wyqto ... -
Java中四种XML解析技术
2009-04-14 14:10 876原文出自:XXXX(忘记了 ...
相关推荐
开发工具 commons-fileupload-1.3.2开发工具 commons-fileupload-1.3.2开发工具 commons-fileupload-1.3.2开发工具 commons-fileupload-1.3.2开发工具 commons-fileupload-1.3.2开发工具 commons-fileupload-1.3.2...
赠送jar包:commons-fileupload-1.4.jar; 赠送原API文档:commons-fileupload-1.4-javadoc.jar; 赠送源代码:commons-fileupload-1.4-sources.jar; 赠送Maven依赖信息文件:commons-fileupload-1.4.pom; 包含...
java+servlet+commons-io-2.4.jar+commons-fileupload-1.3.jar实现文件的上传与下载
赠送jar包:commons-fileupload-1.3.3.jar; 赠送原API文档:commons-fileupload-1.3.3-javadoc.jar; 赠送源代码:commons-fileupload-1.3.3-sources.jar; 赠送Maven依赖信息文件:commons-fileupload-1.3.3.pom;...
使用commons-fileupload实现的文件上传和下载,上传和下载都没有中文乱码问题
commons commons-fileupload历史版本jar包集合,包括src源码 附件列表: commons-fileupload-1.0.zip commons-fileupload-1.1.1.zip commons-fileupload-1.1.zip commons-fileupload-1.2.1-bin.zip commons-...
commons-fileupload-1.2.2commons-fileupload-1.2.2commons-fileupload-1.2.2commons-fileupload-1.2.2commons-fileupload-1.2.2commons-fileupload-1.2.2commons-fileupload-1.2.2commons-fileupload-1.2.2commons-...
commons-fileupload-1.3.3.jar和commons-io-2.6.jar最新版本
使用commons-fileupload上传文件 使用commons-fileupload上传文件
commons-fileupload实现文件上传
commons-fileupload-1.3.2.jar和commons-io-2.5.jar
commons-lang-2.3.jar,在使用组件实现文件上传时候要注意前后台的一致性,注意在后台定义File文件对象名要与jsp页面中的file标签name名字一致,前台form标签属性一定要设置为enctype="multipart/form-data",而且...
commons-fileupload-1.2.1.jar和commons-io-1.3.2.jar jar 文件。 commons-fileupload-1.2.1.jar和commons-io-1.3.2.jar 案例上传: http://hi.baidu.com/lichao77821/blog commons-fileupload-1.2.1.jar和commons-...
利用servlet实现的commons-fileupload的实例。也就是文件上传实例。
commons-fileupload-1.3.2jar包和commons-io-2.5jar包,可以到http://commons.apache.org里面下载最新版本。
commons-fileupload-1.3.1.jar
commons-fileupload-1.4.jar
commons-fileupload实现文件上传下载
commons-fileupload.rar;包括commons-fileupload-1.3.1-bin和commons-io-2.4两个文件;文件上传接口需要这个包;
commons-fileupload-1.3.jar和commons-io-1.2.jar