commons-upload 实现文件的上传功能 -

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commons-upload 实现文件的上传功能

Apache Servlet log4j Web HTML

html:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>upload</title>
</head>
<body>
<form action="servlet/Upload" method="post" enctype="multipart/form-data">
author:<input name="author"/>
file:<input type="file" name="file"/>
<input type="submit" value="ok"/>
</form>
</body>
</html>

servlet:

package servlet;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
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.DiskFileUpload;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUpload;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.RequestContext;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.servlet.ServletRequestContext;
import org.apache.log4j.Logger;

import sun.reflect.ReflectionFactory.GetReflectionFactoryAction;
/**
*
* @author zwc
*
*/
@SuppressWarnings("serial")
public class Upload extends HttpServlet {
private static Logger logger = Logger.getLogger(OperateCustomer.class);
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}

@SuppressWarnings("deprecation")
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
response.setCharacterEncoding("UTF-8");
request.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();

String uploadDir = getServletContext().getRealPath("/WEB-INF/upload");

注：上传的，文件，最好，存在web-inf目录下，因为，该目录下的，内容是浏览器，无法访问滴，要不如果你上传一个jsp，文件，那么，不是可以直接通过目录访问，可能对网站造成影响
if(uploadDir == null){
logger.warn("无法访问上传目录:/WEB-INF/upload");
}

File uploadFile = new File(uploadDir);
if(!uploadFile.exists()){
if(uploadFile.mkdir()){
logger.warn("无法创建目录");
}
}
DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();
ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);
ServletRequestContext requestContext = new ServletRequestContext(request);

try {
Iterator<FileItem> i = (Iterator<FileItem>) servletFileUpload.parseRequest(requestContext).iterator();
while(i.hasNext()){
FileItem item = i.next();
if(item.isFormField()){
out.print("Field:" + item.getFieldName() + ">>" + item.getString());
}else{
String name = item.getName();
logger.info("得到的文件路径为：" + item.getName());
int start = name.lastIndexOf("\\");
String otherName = name.substring(start);
File desFile = new File(uploadDir + otherName);
try {
logger.info("保存的文件路径：" + uploadDir + otherName);
item.write(desFile);
out.print( otherName + "上传成功！！");
} catch (Exception e) {
logger.warn("写入上传目录时，失败",e);
} finally{
logger.info("删除临时文件");
item.delete();
}
}
}
} catch (FileUploadException e) {
logger.warn("无法从页面获得数据", e);
}
}
}