下载两样东西
都来自于apache的commons 项目
commons-fileupload-1.3-bin.zip：http://commons.apache.org/proper/commons-fileupload/
上面那个依赖于 commons-io-2.4-bin.zip
commons-io-2.4-bin.zip： http://commons.apache.org/proper/commons-io/
将两个文件解压后 分别找到找到其中lib下的commons-io-2.4.jar 和 commons-fileupload-1.3.jar 放置在 WEB-INF\lib 中
编写上传时候需要的 jsp代码
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fileUpload.jsp
上传文件的首页展示
==================
<%@ page language=
"java"
contentType=
"text/html; charset=UTF-8"
pageEncoding=
"UTF-8"
%>
<!DOCTYPE html PUBLIC
"-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd"
>
<html>
<head>
<meta http-equiv=
"Content-Type"
content=
"text/html; charset=UTF-8"
>
<title>Insert title here</title>
</head>
<body>
<form action=
"UploadServlet"
method=
"post"
enctype=
"multipart/form-data"
>
username:<input type=
"text"
name=
"username"
><br/>
file: <input type=
"file"
name=
"file"
><br/>
file2: <input type=
"file"
name=
"file2"
><br/>
<input type=
"submit"
value=
"submit"
><br/>
</form>
</body>
</html>
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UploadServlet.java
用于处理上传过来的文件的servlet
===================================
import
java.io.File;
import
java.io.IOException;
import
java.util.List;
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.disk.DiskFileItemFactory;
import
org.apache.commons.fileupload.servlet.ServletFileUpload;
public
class
UploadServlet
extends
HttpServlet {
private
static
final
long
serialVersionUID = 1L;
protected
void
doPost(HttpServletRequest req, HttpServletResponse resp)
throws
ServletException, IOException {
DiskFileItemFactory factory =
new
DiskFileItemFactory();
String path = req.getRealPath(
"/upload"
);
factory.setRepository(
new
File(path));
factory.setSizeThreshold(
1024
*
1024
);
ServletFileUpload upload =
new
ServletFileUpload(factory);
try
{
List<FileItem> list = (List<FileItem>)upload.parseRequest(req);
for
(FileItem item : list){
String name = item.getFieldName();
if
(item.isFormField()){
String value = item.getString();
System.out.println(name+
" = "
+value);
req.setAttribute(name, value);
}
else
{
String value = item.getName();
System.out.println(value);
int
start = value.lastIndexOf(
"\\"
);
String fileName = value.substring(start+
1
);
System.out.println(name+
" = "
+value);
req.setAttribute(name, fileName);
item.write(
new
File(path, fileName));
}
}
}
catch
(Exception ex){
ex.printStackTrace();
}
req.getRequestDispatcher(
"fileUploadResult.jsp"
).forward(req, resp);
}
}
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fileUploadResult.jsp
上传完后提示 展示的
=================================
<%@ page language=
"java"
contentType=
"text/html; charset=UTF-8"
import
=
"java.util.*, java.io.*"
pageEncoding=
"UTF-8"
%>
<!DOCTYPE html PUBLIC
"-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd"
>
<html>
<head>
<meta http-equiv=
"Content-Type"
content=
"text/html; charset=UTF-8"
>
<title>Insert title here</title>
</head>
<body>
<%-- <%
InputStream is = request.getInputStream();
BufferedReader br =
new
BufferedReader(
new
InputStreamReader(is));
String buffer =
null
;
while
(
null
!= (buffer=br.readLine())){
out.print(buffer+
"<br>"
);
}
br.close();
is.close();
%> --%>
username: ${requestScope.username }<br />
file: ${requestScope.file }<br />
file: ${requestScope.file2 }<br />
</body>
</html>
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=======================================================================
注意：整个程序就这么写好了
需要在 WebContent 下创建一个upload文件夹 进行上传文件的保存
但是如果直接在eclipse jee 当中的tomcat运行的话 保存 到的目录会在别的地址当中 应该是 跟运行环境有关
需要打成war包部署到tomcat当中运行才能正确的上传到 指定的位置
本文转自 拖鞋崽 51CTO博客，原文链接:http://blog.51cto.com/1992mrwang/1242815
