uplaod文件例子 WebFormApacheJSPHTMLServlet
要有commons-fileupload-1.1.1.jar和commons-io-1.1.jar包
//post.jsp
<%@ page language="java" contentType="text/html; charset=gbk"
pageEncoding="gbk"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk">
<title>上传页面</title>
</head>
<body>
<form name="Webform" action="upload.jsp" method="post" enctype="multipart/form-data">
输入你的名字:<br/>
<input type="text" name="name" size="15" value="张月"/><br />
图形:<br />
<input type="file" name="myimage"><br/>
文件:<br />
<input type="file" name="myfile"><br /><br />
<input type="submit" name="Submit" value="Submit your files"/>
</form>
</body>
</html>
//upload.jsp
<%@ page language="java" contentType="text/html; charset=gbk"
pageEncoding="gbk"%>
<%@ page import="java.util.*"%>
<%@ page import="java.io.File"%>
<%@ page import="java.text.*"%>
<%@ page import="org.apache.commons.fileupload.FileItem"%>
<%@ page import="org.apache.commons.fileupload.FileItemFactory"%>
<%@ page import="org.apache.commons.fileupload.FileUpload"%>
<%@ page import="org.apache.commons.fileupload.disk.DiskFileItemFactory"%>
<%@ page import="org.apache.commons.fileupload.servlet.ServletFileUpload"%>
<%@ page import="org.apache.commons.fileupload.FileUploadBase"%>
<%@ page import="org.apache.commons.fileupload.FileUploadBase.SizeLimitExceededException"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk">
<title>Insert title here</title>
</head>
<body>
<%
// 检查输入请求是否为multipart的表单数据。
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if(!isMultipart){
out.print("表单数据格式不是multipart/form-data，或者非法提交");
return;
}
DiskFileItemFactory factory = new DiskFileItemFactory();// Create a factory for disk-based file items
factory.setSizeThreshold(102400);// 设置初始化内存，如果上传的文件超过该大小，将不保存到内存，而且硬盘中(单位：byte)
File fileTemp = new File("c:\\temp");// 建立临时目录
fileTemp.mkdir();
%>
<%--
如果上传的文件超过设置内存的大小，将文件保存至该目录，
待文件上传完毕后，自动删除上传的临时文件；
如果多次上传同一个文件，该文件会保存到服务器的临时目录，而不删除
--%>
<%
factory.setRepository(fileTemp);
ServletFileUpload upload = new ServletFileUpload(factory);// 创建文件上传对象
//DiskFileUpload upload = new DiskFileUpload(); //自己的
upload.setSizeMax(102400);// 设置客户端最大上传，-1为无限大（单位：byte）
//upload.setSizeMax(1024000);
//FileUploadBase.SizeLimitExceededException
List items = null;
try {
items = upload.parseRequest(request);// 分析request，并将保存结果至List里
System.out.println(items);
} catch(SizeLimitExceededException e){
out.print("上传的文件超过系统限制（1MB）");
return;
}
Iterator itr = items.iterator();
while(itr.hasNext()) {// 循环处理表单元素
FileItem item = (FileItem) itr.next();
System.out.println("item is: "+item);
if(item.isFormField()) {// 普通的表单
if("name".equals(item.getFieldName())){
String name = item.getFieldName();
System.out.println(name);
String value = item.getString("gbk");
System.out.println(name+ "：=" + value);
}
}
else {// 上传文件
if(item.getSize()!=0){
String filename = item.getName();// 获取文件的客户端上传路径
int i = filename.lastIndexOf("\\");
filename = filename.substring(i+1);// 获取文件名
System.out.println("文件名:"+filename);
System.out.println("Realpath is:"+getServletContext().getRealPath("/"));
//注意：创建File savedFile时，要在getRealPath("/")的目录下创建一个temp的目录，因为它传了getRealPath("/")+"temp"字符串了.
File savedFile = new File(getServletContext().getRealPath("/") + "temp", filename);
//File savedFile = new File("D:\\xpghost", filename);
System.out.println(item);
item.write(savedFile);
out.println("upload success!!!");
System.out.println("upload success!!!");
}
}
}
%>
</body>
</html>