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package com.future.zfs.util;

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.FileItem;

import org.apache.commons.fileupload.FileUploadException;

import org.apache.commons.fileupload.FileUploadBase.SizeLimitExceededException;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

@SuppressWarnings("serial")

public class FileUploadServlet extends HttpServlet {

final long MAX_SIZE = 10 * 1024 * 1024;// 设置上传文件最大为 10M

// 允许上传的文件格式的列表

final String[] allowtype = new String[] {"jpg","jpeg","gif","txt","doc","docx","mp3","wma","m4a","xls"};

public FileUploadServlet() {

super();

}

public void destroy() {

super.destroy();

}

@Override

protected void service(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html");

// 设置字符编码为UTF-8, 这样支持汉字显示

response.setCharacterEncoding("UTF-8");

// 实例化一个硬盘文件工厂,用来配置上传组件ServletFileUpload

DiskFileItemFactory dfif = new DiskFileItemFactory();

dfif.setSizeThreshold(4096);// 设置上传文件时用于临时存放文件的内存大小,这里是4K.多于的部分将临时存在硬盘

dfif.setRepository(new File(request.getRealPath("/")

+ "uploadtemp"));// 设置存放临时文件的目录,web根目录下的uploadtemp目录

// 用以上工厂实例化上传组件

ServletFileUpload sfu = new ServletFileUpload(dfif);

// 设置最大上传尺寸

sfu.setSizeMax(MAX_SIZE);

PrintWriter out = response.getWriter();

// 从request得到 所有 上传域的列表

List fileList = null;

try {

fileList = sfu.parseRequest(request);

} catch (FileUploadException e) {// 处理文件尺寸过大异常

if (e instanceof SizeLimitExceededException) {

out.println("{message:'文件尺寸超过规定大小:"+MAX_SIZE+"字节'}");

return;

}

e.printStackTrace();

}

// 没有文件上传

if (fileList == null || fileList.size() == 0) {

out.println("{message:'请选择上传文件'}");

return;

}

// 得到所有上传的文件

Iterator fileItr = fileList.iterator();

// 循环处理所有文件

while (fileItr.hasNext()) {

FileItem fileItem = null;

String path = null;

long size = 0;

// 得到当前文件

fileItem = (FileItem) fileItr.next();

// 忽略简单form字段而不是上传域的文件域(<input type="text" />等)

if (fileItem == null || fileItem.isFormField()) {

continue;

}

// 得到文件的完整路径

path = fileItem.getName();

// 得到文件的大小

size = fileItem.getSize();

if ("".equals(path) || size == 0) {

out.println("{message:'请选择上传文件'}");

return;

}

// 得到去除路径的文件名

String t_name = path.substring(path.lastIndexOf("\\") + 1);

// 得到文件的扩展名(无扩展名时将得到全名)

String t_ext = t_name.substring(t_name.lastIndexOf(".") + 1);

// 拒绝接受规定文件格式之外的文件类型

int allowFlag = 0;

int allowedExtCount = allowtype.length;

for (; allowFlag < allowedExtCount; allowFlag++) {

if (allowtype[allowFlag].equals(t_ext))

break;

}

if (allowFlag == allowedExtCount) {

String message = "";

for (allowFlag = 0; allowFlag < allowedExtCount; allowFlag++){

message+="*." + allowtype[allowFlag]

+ " ";

}

out.println("{message:'请上传以下类型的文件"+message+"'}");

return;

}

long now = System.currentTimeMillis();

// 根据系统时间生成上传后保存的文件名

String prefix = String.valueOf(now);

// 保存的最终文件完整路径,保存在web根目录下的upload目录下

String u_name = request.getRealPath("/") + "upload/"

+ prefix + "." + t_ext;

//原来的文件名

path=request.getRealPath("/") + "upload/"+path;

try {

// 保存文件

fileItem.write(new File(path));

response.setStatus(200);

out.println("{message:\"文件上传成功. 已保存为: " + prefix + "." + t_ext

+ " 文件大小: " + size + "字节\"}");

} catch (Exception e) {

e.printStackTrace();

}

}

}

}

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<servlet>

<servlet-name>fileUploadServlet</servlet-name>

<servlet-class>com.future.zfs.util.FileUploadServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>fileUploadServlet</servlet-name>

<url-pattern>/fileUploadServlet</url-pattern>

</servlet-mapping>

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<%@ 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>

<script type="text/javascript" src="js/jquery.js"></script>

<script type="text/javascript" src="js/ajaxfileupload.js"></script>

<script type="text/javascript">

function ajaxFileUpload()

{

$("#loading")

.ajaxStart(function(){

$(this).show();

})//开始上传文件时显示一个图片

.ajaxComplete(function(){

$(this).hide();

});//文件上传完成将图片隐藏起来

$.ajaxFileUpload

(

{

url:'fileUploadServlet',//用于文件上传的服务器端请求地址

secureuri:false,//一般设置为false

fileElementId:'file',//文件上传空间的id属性 <input type="file" id="file" name="file" />

dataType: 'json',//返回值类型 一般设置为json

success: function (data, status) //服务器成功响应处理函数

{

//alert(data.message);//从服务器返回的json中取出message中的数据,其中message为在struts2中定义的成员变量

$('#myspan').html(data.message);

if(typeof(data.error) != 'undefined')

{

if(data.error != '')

{

//alert(data.error);

$('#myspan').html(data.message);

}else

{

//alert(data.message);

$('#myspan').html(data.message);

}

}

},

error: function (data, status, e)//服务器响应失败处理函数

{

//alert(e);

$('#myspan').html(e);

}

}

)

return false;

}

</script>

</head>

<body>

<img src="images/loading.gif" id="loading" style="display: none;">

<span style="color: red;" id="myspan"></span><br/>

<input type="file" id="file" name="file" />

<br />

<input type="button" value="上传" onclick="return ajaxFileUpload();">

<a href="fileDownLoadServlet?filename=通讯录.xls">哈哈，测试文件下载</a>

</body>

</html>