Java文件上传组件 common-fileUpload 使用教程

01

package

com.file.helper;

02

03

import

java.io.IOException;

04

import

java.util.Properties;

05

06

public

class

FileConst {

07

08

private

static

Properties properties=

new

Properties();

09

static

{

10

try

{

11

properties.load(ReadUploadFileType.

class

.getClassLoader().getResourceAsStream(

"uploadConst.properties"

));

12

}

catch

(IOException e) {

13

e.printStackTrace();

14

}

15

}

16

17

public

static

String getValue(String key){

18

String value = (String)properties.get(key);

19

return

value.trim();

20

}

21

}

01

package

com.file.helper;

02

03

import

java.io.File;

04

import

java.io.IOException;

05

import

java.util.ArrayList;

06

import

java.util.List;

07

import

java.util.Properties;

08

09

import

javax.activation.MimetypesFileTypeMap;

10

11

12

13

/**

14

* 读取配置文件

15

* @author Owner

16

*

17

*/

18

public

class

ReadUploadFileType {

19

20

21

private

static

Properties properties=

new

Properties();

22

static

{

23

try

{

24

properties.load(ReadUploadFileType.

class

.getClassLoader().getResourceAsStream(

"allow_upload_file_type.properties"

));

25

}

catch

(IOException e) {

26

e.printStackTrace();

27

}

28

29

}

30

/**

31

* 判断该文件是否为上传的文件类型

32

* @param uploadfile

33

* @return

34

*/

35

public

static

Boolean readUploadFileType(File uploadfile){

36

if

(uploadfile!=

null

&&uploadfile.length()>

0

){

37

String ext = uploadfile.getName().substring(uploadfile.getName().lastIndexOf(

"."

)+

1

).toLowerCase();

38

List<String>allowfiletype =

new

ArrayList<String>();

39

for

(Object key : properties.keySet()){

40

String value = (String)properties.get(key);

41

String[] values = value.split(

","

);

42

for

(String v:values){

43

allowfiletype.add(v.trim());

44

}

45

}

46

// "Mime Type of gumby.gif is image/gif"

47

return

allowfiletype.contains(

new

MimetypesFileTypeMap().getContentType(uploadfile).toLowerCase())&&properties.keySet().contains(ext);

48

}

49

return

true

;

50

}

51

52

53

}

001

package

com.file.upload;

002

003

import

java.io.File;

004

import

java.util.Iterator;

005

import

java.util.List;

006

007

import

javax.servlet.http.HttpServletRequest;

008

009

import

org.apache.commons.fileupload.FileItem;

010

import

org.apache.commons.fileupload.FileUploadException;

011

import

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

012

import

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

013

014

import

com.file.helper.FileConst;

015

import

com.file.helper.ReadUploadFileType;

016

017

public

class

FileUpload {

018

private

static

String uploadPath =

null

;

// 上传文件的目录

019

private

static

String tempPath =

null

;

// 临时文件目录

020

private

static

File uploadFile =

null

;

021

private

static

File tempPathFile =

null

;

022

private

static

int

sizeThreshold =

1024

;

023

private

static

int

sizeMax =

4194304

;

024

//初始化

025

static

{

026

sizeMax  = Integer.parseInt(FileConst.getValue(

"sizeMax"

));

027

sizeThreshold = Integer.parseInt(FileConst.getValue(

"sizeThreshold"

));

028

uploadPath = FileConst.getValue(

"uploadPath"

);

029

uploadFile =

new

File(uploadPath);

030

if

(!uploadFile.exists()) {

031

uploadFile.mkdirs();

032

}

033

tempPath = FileConst.getValue(

"tempPath"

);

034

tempPathFile =

new

File(tempPath);

035

if

(!tempPathFile.exists()) {

036

tempPathFile.mkdirs();

037

}

038

}

039

/**

040

* 上传文件

041

* @param request

042

* @return true 上传成功 false上传失败

043

*/

044

@SuppressWarnings

(

"unchecked"

)

045

public

static

boolean

upload(HttpServletRequest request){

046

boolean

flag =

true

;

047

//检查输入请求是否为multipart表单数据。

048

boolean

isMultipart = ServletFileUpload.isMultipartContent(request);

049

//若果是的话

050

if

(isMultipart){

051

/**为该请求创建一个DiskFileItemFactory对象，通过它来解析请求。执行解析后，所有的表单项目都保存在一个List中。**/

052

try

{

053

DiskFileItemFactory factory =

new

DiskFileItemFactory();

054

factory.setSizeThreshold(sizeThreshold);

// 设置缓冲区大小，这里是4kb

055

factory.setRepository(tempPathFile);

// 设置缓冲区目录

056

ServletFileUpload upload =

new

ServletFileUpload(factory);

057

upload.setHeaderEncoding(

"UTF-8"

);

//解决文件乱码问题

058

upload.setSizeMax(sizeMax);

// 设置最大文件尺寸

059

List<FileItem>items = upload.parseRequest(request);

060

// 检查是否符合上传的类型

061

if

(!checkFileType(items))

return

false

;

062

Iterator<FileItem>itr = items.iterator();

//所有的表单项

063

//保存文件

064

while

(itr.hasNext()){

065

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

//循环获得每个表单项

066

if

(!item.isFormField()){

//如果是文件类型

067

String name = item.getName();

//获得文件名 包括路径啊

068

if

(name!=

null

){

069

File fullFile=

new

File(item.getName());

070

File savedFile=

new

File(uploadPath,fullFile.getName());

071

item.write(savedFile);

072

}

073

}

074

}

075

}

catch

(FileUploadException e) {

076

flag =

false

;

077

e.printStackTrace();

078

}

catch

(Exception e) {

079

flag =

false

;

080

e.printStackTrace();

081

}

082

}

else

{

083

flag =

false

;

084

System.out.println(

"the enctype must be multipart/form-data"

);

085

}

086

return

flag;

087

}

088

089

/**

090

* 删除一组文件

091

* @param filePath 文件路径数组

092

*/

093

public

static

void

deleteFile(String [] filePath){

094

if

(filePath!=

null

&& filePath.length>

0

){

095

for

(String path:filePath){

096

String realPath = uploadPath+path;

097

File delfile =

new

File(realPath);

098

if

(delfile.exists()){

099

delfile.delete();

100

}

101

}

102

103

}

104

}

105

106

/**

107

* 删除单个文件

108

* @param filePath 单个文件路径

109

*/

110

public

static

void

deleteFile(String filePath){

111

if

(filePath!=

null

&& !

""

.equals(filePath)){

112

String [] path =

new

String []{filePath};

113

deleteFile(path);

114

}

115

}

116

117

/**

118

* 判断上传文件类型

119

* @param items

120

* @return

121

*/

122

private

static

Boolean checkFileType(List<FileItem>items){

123

Iterator<FileItem>itr = items.iterator();

//所有的表单项

124

while

(itr.hasNext()){

125

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

//循环获得每个表单项

126

if

(!item.isFormField()){

//如果是文件类型

127

String name = item.getName();

//获得文件名 包括路径啊

128

if

(name!=

null

){

129

File fullFile=

new

File(item.getName());

130

boolean

isType = ReadUploadFileType.readUploadFileType(fullFile);

131

if

(!isType)

return

false

;

132

break

;

133

}

134

}

135

}

136

137

return

true

;

138

}

139

}

01

package

com.file.servlet;

02

03

import

java.io.IOException;

04

05

import

javax.servlet.ServletException;

06

import

javax.servlet.http.HttpServlet;

07

import

javax.servlet.http.HttpServletRequest;

08

import

javax.servlet.http.HttpServletResponse;

09

10

import

com.file.upload.FileUpload;

11

12

13

@SuppressWarnings

(

"serial"

)

14

public

class

FileUploadServlet

extends

HttpServlet {

15

16

public

void

doGet(HttpServletRequest request, HttpServletResponse response)

17

throws

ServletException, IOException {

18

this

.doPost(request, response);

19

}

20

21

22

public

void

doPost(HttpServletRequest request, HttpServletResponse response)

23

throws

ServletException, IOException {

24

FileUpload.upload(request);

25

}

26

27

}

01

package

com.file.servlet;

02

03

import

java.io.IOException;

04

05

import

javax.servlet.ServletException;

06

import

javax.servlet.http.HttpServlet;

07

import

javax.servlet.http.HttpServletRequest;

08

import

javax.servlet.http.HttpServletResponse;

09

10

import

com.file.upload.FileUpload;

11

12

@SuppressWarnings

(

"serial"

)

13

public

class

DeleteFileServlet

extends

HttpServlet {

14

public

void

doGet(HttpServletRequest request, HttpServletResponse response)

15

throws

ServletException, IOException {

16

this

.doPost(request, response);

17

}

18

19

public

void

doPost(HttpServletRequest request, HttpServletResponse response)

20

throws

ServletException, IOException {

21

String [] file = request.getParameterValues(

"fileName"

);

22

FileUpload.deleteFile(file);

23

}

24

25

}

01

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

02

<%

03

String path = request.getContextPath();

04

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

05

%>

06

07

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

08

<

html

>

09

<

head

>

10

<

base

href="<%=basePath%>">

11

12

<

title

>My JSP 'index.jsp' starting page</

title

>

13

<

meta

http-equiv

=

"pragma"

content

=

"no-cache"

>

14

<

meta

http-equiv

=

"cache-control"

content

=

"no-cache"

>

15

<

meta

http-equiv

=

"expires"

content

=

"0"

>   

16

<

meta

http-equiv

=

"keywords"

content

=

"keyword1,keyword2,keyword3"

>

17

<

meta

http-equiv

=

"description"

content

=

"This is my page"

>

18

<!--

19

<link rel="stylesheet" type="text/css" href="styles.css">

20

-->

21

</

head

>

22

23

<

body

>

24

<

form

name

=

"myform"

action

=

"http://xxx.com/FileUploadServlet"

method

=

"post"

enctype

=

"multipart/form-data"

>

25

File:

26

<

input

type

=

"file"

name

=

"myfile"

><

br

>

27

<

br

>

28

<

input

type

=

"submit"

name

=

"submit"

value

=

"Commit"

>

29

</

form

>

30

</

body

>

31

</

html

>