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ASIHTTPRequest系列(三)：文件上传

2011-06-03 15:35 471 查看

五、文件上传

1、服务端

文件上传需要服务端的配合。我们可在本机搭建tomcat测试环境。关于tomcat在Mac
OSX下的安装配置，参考作者另一博文《安装Tomcat到Mac OSX》。

打开Eclipse，新建web工程。在其中新建一个Servlet
UploadServlet：

import

java.io.*;

import

java.util.*;

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.disk.DiskFileItemFactory;

import

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

public

class

UploadServlet

extends

HttpServlet {

private

boolean

isMultipart
;

private

String
filePath
,
title
;

private

int

maxFileSize
= 500 * 1024;

private

int

maxMemSize
= 4 * 1024;

private

File
file
;

public

void

init( ){

//
从
web.xml
的
context_param
中获得上传文件目录（
/data
）
.

filePath
=

getServletContext().getInitParameter(
"file-upload"
);

}

public

void

doPost(HttpServletRequest request,

HttpServletResponse response)

throws

ServletException,
java.io.IOException {

//
检查表单是否带有
ENCTYPE="multipart
/form-data"

isMultipart
=
ServletFileUpload.isMultipartContent
(request);

response.setContentType(
"text/html"
);

response.setCharacterEncoding(
"GBK"
);

java.io.PrintWriter out = response.getWriter( );

if

( !
isMultipart
){

out.println(
"<html>"
);

out.println(
"<head>"
);

out.println(
"<title>Servlet upload</title>"
);

out.println(
"</head>"
);

out.println(
"<body>"
);

out.println(
"<p>No file uploaded</p>"
);

out.println(
"</body>"
);

out.println(
"</html>"
);

return

;

}

DiskFileItemFactory
factory =
new

DiskFileItemFactory();

//
内存最大可缓存尺寸

factory.setSizeThreshold(
maxMemSize
);

//
指定当数据超过内存最大可缓存尺寸时，临时文件的目录

factory.setRepository(
new

File(
filePath
+
"temp"
));

//
文件上传对象

ServletFileUpload upload =
new

ServletFileUpload(factory);

//
设置文件上传最大允许尺寸

upload.setSizeMax(
maxFileSize
);

try

{

out.println(
"<%@page
contentType='text/html; charset=GBK'%>"
);

out.println(
"<html>"
);

out.println(
"<head>"
);

out.println(
"<title>Servlet
upload</title>"
);

out.println(
"</head>"
);

out.println(
"<body>"
);

//
获取
multipart

/form-data
内容，其中每个
field
被分成不同
part

List
fileItems = upload.parseRequest(request);

//
枚举每个
field

Iterator
i = fileItems.iterator();

while

( i.hasNext () )

{

FileItem fi = (FileItem)i.next();

if

( !fi.isFormField
() )

//
如果
field
为
File

{

//
获取
field
的
name
或
id

String fieldName
= fi.getFieldName();

String fileName = fi.getName();

//
文件名中文处理

fileName=
new

String(fileName.getBytes(),
"gbk"
);

out.println(
"file name:"
+fileName+
"<br>"
);

String contentType
= fi.getContentType();

boolean

isInMemory
= fi.isInMemory();

long

sizeInBytes
= fi.getSize();

//
把上传数据写入本地磁盘

if

(
fileName.lastIndexOf(
"//"
) >= 0 ){

file
=
new

File(
filePath
+

fileName.substring( fileName.lastIndexOf(
"//"
))) ;

}
else

{

file
=
new

File(
filePath
+

fileName.substring(fileName.lastIndexOf(
"//"
)+1)) ;

}

fi.write(
file
) ;

out.println(
"Uploaded Filename:
"
+ fileName +
"<br>"
);

}
else

{
//
如果
field
为
Form Field

title
=fi.getFieldName();

if

(
title
.equals(
"title"
)){

title
=
new

String(fi.get(),
"gbk"
);

out.println(
"title:"
+
title
+
"<br>"
);

}

}

}

out.println(
"</body>"
);

out.println(
"</html>"
);

}
catch

(Exception ex) {

System.
out

.println(ex);

}

}

public

void

doGet(HttpServletRequest request,

HttpServletResponse response)

throws

ServletException,
java.io.IOException {

throw

new

ServletException(
"GET method used with "
+

getClass( ).getName( )+
": POST
method required."
);

}

}

再新建一个upload.jsp页面作为测试：

<%@
page
contentType
=
"text/html; charset=GBK"

language
=
"java"

import
=
"java.util.*"

%>

<
html
>

<
head
>

<
title
>
fbysss

UploadBean
示例
</
title
>





</
head
>

<
FORM
name
=
"form1"

METHOD
=
"POST"

ACTION
=
"UploadServlet"

ENCTYPE
=
"multipart/form-data"

>

<
input
name
=
"title"

type
=
"text"

value
=
"

请选择文件

"

>

<
p
>
附件
</
p
>

<
p
>

<
input
name
=
"attach"

type
=
"FILE"

id
=
"attach"

size
=
"50"

>

</
p
>

<
input
name
=
"ok"

type
=
"submit"

value
=
"

提交

"

>

</
form
>

</
html
>

将工程部署到tomcat中，启动tomcat，访问
http://localhost:8080/test/upload.jsp
，显示界面如下：

选择一个文件进行上传，然后到/data目录下检查该文件是否上传成功。

2、iPhone客户端

新建类，选择UIViewController subclass，并勾上“With
XIB for user interface”，命名为 UploadViewController。

用 IB 打开 Xib 文件，在其中拖入1个 UIToolBar 、1个
UIBarButtonItem 和1个 UIWebView、1个UIProgressView：

在Xcode中声明必要的变量和 IBOutlet／IBAction:

#import
<UIKit/UIKit.h>

#import
"ASIFormDataRequest.h"

#import
"ASIHTTPRequest.h"

@interface
UploadViewController : UIViewController {

UIBarItem
*
button
;

UIWebView
*
webView
;

UIProgressView
*
progress
;

ASIFormDataRequest
*
request
;

NSURL
*
url
;

}

@property
(
retain
,
nonatomic
)
IBOutlet
UIBarItem* button;

@property
(
retain
,
nonatomic
)
IBOutlet
UIProgressView* progress;

@property
(
retain
,
nonatomic
)
IBOutlet
UIWebView* webView;

-(
IBAction
)go;

-(
void
)printBytes:(
NSString

*)str encoding:(
NSStringEncoding
)enc;

@end

将所有出口正确地连接到 UpdateController.xib 中，保存。

打开MainWindow.xib，拖一个UIViewController进去并将其Identifier改为UpdateController，再将它连接到Window对象的的rootViewController。

编写 UIButton 的 Touch up inside 事件代码如下：

-(
IBAction
)go{

NSString
* s=
@"
哈哈哈
"
;

url
=[
NSURL

URLWithString
:
@"http://localhost:8080/test/UploadServlet"
];

request
= [
ASIFormDataRequest

requestWithURL
:
url
];

//
字符串使用
GBK
编码，因为
servlet
只识别
GBK

NSStringEncoding
enc=
CFStringConvertEncodingToNSStringEncoding
(
kCFStringEncodingMacChineseSimp
);

[
request

setStringEncoding
:enc];

[
self

printBytes
:s
encoding
:enc];
//
打印
GBK
编码字符

[
request

setPostValue
:s
forKey
:
@"title"
];

[
request

setFile
:
@"/Users/kmyhy/Documents/iphone/Iphone
开发介绍
.doc"

forKey
:
@"attach"
];

[
request

setDelegate
:
self
];

[
request

setDidFinishSelector
:
@selector
(
responseComplete
)];

[
request

setDidFailSelector
:
@selector
(responseFailed)];

[
button

setEnabled
:
NO
];

[
request

startSynchronous
];

}

-(
void
)responseComplete{

//
请求响应结束，返回
responseString

NSString

*responseString = [
request

responseString
];

[
webView

loadHTMLString
:responseString

baseURL
:
url
];

[
button

setEnabled
:
YES
];

}

-(
void
)respnoseFailed{

//
请求响应失败，返回错误信息

NSError
*error = [
request

error
];

[
webView

loadHTMLString
:[error
description
]
baseURL
:
url
];

[
button

setEnabled
:
YES
];

}

-(
void
)printBytes:(
NSString
*)str
encoding:(
NSStringEncoding
)enc{

NSLog
(
@"defaultCStringEncoding:%d"
,[
NSString

defaultCStringEncoding
]);

//

根据给定的字符编码，打印出编码后的字符数组

const

char
*bytes=
[str
cStringUsingEncoding
:enc];

for
(
int
i=
0
;i<
strlen
(bytes);i++)
{

NSLog
(
@"%d
%X"
,(i+
1
),bytes[i]);

}

}

编译、运行。点击go按钮，程序运行效果如下：

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