用FileUpload实现文件上传
用apache的一个开源项目fileupload可以轻松的实现文件的上传，目前的最新版本是commons-fileupload-1.2，可以到apache的网站下载。
import java.io.File;
import java.util.Iterator;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.MappingDispatchAction;
import org.apache.commons.fileupload.*;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class UploadFile extends MappingDispatchAction ...{
private static final int FILE_SIZE = 4194304;
public ActionForward upload(ActionMapping mapping, ActionForm form,
HttpServletRequest request,HttpServletResponse response) ...{
try ...{
DiskFileItemFactory fc = new DiskFileItemFactory();
//设置文件的最大限度，如果超出这个限度，则将文件写入磁盘
fc.setSizeThreshold(4000);
//文件超过最大限度时，写入磁盘的临时路径
fc.setRepository(new File("E:\tmp"));
ServletFileUpload fu = new ServletFileUpload(fc);
//设置最大文件尺寸，单位为字节，这里是4MB
fu.setSizeMax(FILE_SIZE);
//得到所有的文件：
List fileItems = fu.parseRequest(request);
Iterator i = fileItems.iterator();
//依次处理每一个文件：
while(i.hasNext()) ...{
FileItem fi = (FileItem)i.next();
//获得文件名，这个文件名包括路径：
String fileName = fi.getName();
if (fi.getSize() > FILE_SIZE)
throw new Exception("File is too large!");
fileName = fileName.substring(fileName.lastIndexOf("\") + 1, fileName.length());
//写入文件
fi.write(new File("e:\tmps\" + fileName));
}(来源www.iocblog.net)
} catch (Exception e) ...{
// TODO Auto-generated catch block
e.printStackTrace();
return mapping.findForward("uploadFail");
}
return mapping.findForward("success");
}
}
页面代码：
<%...@ page pageEncoding="utf-8"%>
<html>
<body>
<form action="upload.do" method="post" enctype="multipart/form-data">
<center>
选择文件路径：
<input type=file name="filename"/><br>
<input type=submit value="上传"/>
</center>
</form>
</body>
</html>
import java.io.File;import java.util.Iterator;import java.util.List;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionForward;import org.apache.struts.action.ActionMapping;import org.apache.struts.actions.MappingDispatchAction;import org.apache.commons.fileupload.*;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;public class UploadFile extends MappingDispatchAction ...{ private static final int FILE_SIZE = 4194304; public ActionForward upload(ActionMapping mapping, ActionForm form, HttpServletRequest request,HttpServletResponse response) ...{ try ...{ DiskFileItemFactory fc = new DiskFileItemFactory(); //设置文件的最大限度，如果超出这个限度，则将文件写入磁盘 fc.setSizeThreshold(4000); //文件超过最大限度时，写入磁盘的临时路径 fc.setRepository(new File("E:\tmp")); ServletFileUpload fu = new ServletFileUpload(fc); //设置最大文件尺寸，单位为字节，这里是4MB fu.setSizeMax(FILE_SIZE); //得到所有的文件： List fileItems = fu.parseRequest(request); Iterator i = fileItems.iterator(); //依次处理每一个文件： while(i.hasNext()) ...{ FileItem fi = (FileItem)i.next(); //获得文件名，这个文件名包括路径： String fileName = fi.getName(); if (fi.getSize() > FILE_SIZE) throw new Exception("File is too large!"); fileName = fileName.substring(fileName.lastIndexOf("\") + 1, fileName.length()); //写入文件 fi.write(new File("e:\tmps\" + fileName)); }(来源www.iocblog.net) } catch (Exception e) ...{ // TODO Auto-generated catch block e.printStackTrace(); return mapping.findForward("uploadFail"); } return mapping.findForward("success"); }}页面代码：<%...@ page pageEncoding="utf-8"%><html> <body> <form action="upload.do" method="post" enctype="multipart/form-data"> <center> 选择文件路径： <input type=file name="filename"/><br> <input type=submit value="上传"/> </center> </form> </body></html>文章整理：iocblog
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