java组件commons

java组件commons

最近做了一个文件上传、下载、与在线打开文件的功能，刚开始对文件上传的界面中含有其它表单（例如输入框、密码等）在上传的过程中遇到了许多问题，下面我写了一个同时实现文件上传、下载、在线打开文件的测试程序。

首先请看效果图：

核心代码：

package com.jefry;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.net.URL; CyBrC

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.ServletOutputStream;

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;

/**

* Servlet implementation class FileUpload

*/

public class FileUpload extends HttpServlet {

private static final long serialVersionUID = 1L;

private static final String fileDir = "F:/";

/**

* Default constructor.

*/

public FileUpload() {

}

protected void doGet(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

String aFileName = request.getParameter("fileName");

String online = request.getParameter("online");

FileInputStream in = null;

ServletOutputStream out = null;

boolean isOnLine = online != null ? true : false ;

try {

if(isOnLine){

URL u = new URL("file:///"+fileDir + aFileName);

response.setContentType(u.openConnection().getContentType());

response.setHeader("Content-Disposition", "inline; filename="+aFileName);

}

else{

response.setContentType("application/x-msdownload");

response.setHeader("Content-Disposition", "attachment; filename=" + aFileName);

}

in = new FileInputStream(fileDir + aFileName);

out = response.getOutputStream();

out.flush();

int aRead = 0;

while ((aRead = in.read()) != -1 & in != null) {

out.write(aRead);

}

out.flush();

} catch (Throwable e) {

e.printStackTrace();

} finally {

try {

in.close();

out.close();

} catch (Throwable e) {

e.printStackTrace();

}

}

}

protected void doPost(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

try {

DiskFileItemFactory fileFactory = new DiskFileItemFactory();

ServletFileUpload fu = new ServletFileUpload(fileFactory);

List fileItems = fu.parseRequest(request);

Iterator iter = fileItems.iterator();

String uploader = null;

String date = null;

List fileNames = new ArrayList();

while (iter.hasNext()) {

FileItem item = (FileItem) iter.next();

if (!item.isFormField()) { // 文件

String oldFileName = item.getName();

String newFileName = null;

int delimiter = oldFileName.lastIndexOf("/");

if (delimiter == -1)

newFileName = oldFileName.substring(delimiter + 1);

else

newFileName = oldFileName;

fileNames.add(newFileName);

item.write(new File(fileDir + newFileName));

} else { // 表单

String fieldName = item.getFieldName();

if ("uploader".equals(fieldName)) CyBrC{

uploader = item.getString();

} else if ("date".equals(fieldName)) {

date = item.getString();

}

}

}

request.setAttribute("fileNames",fileNames);

request.getRequestDispatcher("download.jsp").forward(request, response);

} catch (Exception e) {

}

}

}

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

文件一：

文件二：

上传者:

日期:

download.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<%@page import="java.util.List"%>

--------------直接下载------------

<%

List fileNames = (List )request.getAttribute("fileNames");

for(String fileName : fileNames) {

%>

<%

}

%>

--------------直接打开---------

<%

for(String fileName : fileNames) {

%>

<%

}

%>

本文已被整理到了《Java上传操作技巧汇总》，欢迎大家学习阅读。

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