ASIHttpRequest☞上传文件

来源：互联网发布：数据库视图和表的区别编辑：程序博客网时间：2024/05/16 13:57

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：

importjava.io.*;

importjava.util.*;

importjavax.servlet.ServletException;

importjavax.servlet.http.HttpServlet;

importjavax.servlet.http.HttpServletRequest;

importjavax.servlet.http.HttpServletResponse;

importorg.apache.commons.fileupload.FileItem;

importorg.apache.commons.fileupload.disk.DiskFileItemFactory;

importorg.apache.commons.fileupload.servlet.ServletFileUpload;

publicclassUploadServletextendsHttpServlet {

privatebooleanisMultipart;

privateStringfilePath,title;

privateintmaxFileSize= 500 * 1024;

privateintmaxMemSize= 4 * 1024;

privateFilefile;

publicvoidinit( ){

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

filePath=

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

}

publicvoiddoPost(HttpServletRequest request,

HttpServletResponse response)

throwsServletException, 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( "No file uploaded" );

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

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

return;

}

DiskFileItemFactory factory = newDiskFileItemFactory();

//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( newFile(filePath+"temp"));

//文件上传对象

ServletFileUpload upload = newServletFileUpload(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= newString(fileName.getBytes(),"gbk");

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

String contentType = fi.getContentType();

booleanisInMemory = fi.isInMemory();

longsizeInBytes = fi.getSize();

//把上传数据写入本地磁盘

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

file= newFile(filePath+

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

} else{

file= newFile(filePath+

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

}

fi.write( file) ;

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

} else{// 如果field为Form Field

title=fi.getFieldName();

if(title.equals("title")){

title=newString(fi.get(),"gbk");

out.println( "title:" + title + " " );

}

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

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

} catch(Exception ex) {

System. out.println(ex);

}

publicvoiddoGet(HttpServletRequest request,

HttpServletResponse response)

throwsServletException, java.io.IOException {

thrownewServletException("GET method used with "+

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

}

再新建一个upload.jsp页面作为测试：

<%@pagecontentType= "text/html; charset=GBK"language ="java" import= "java.util.*"%>

<html>

<head>

<title>fbysssUploadBean示例</title>

</head>

<FORMname= "form1"METHOD ="POST" ACTION= "UploadServlet"ENCTYPE ="multipart/form-data" >

<inputname= "title"type = "text" value= " 请选择文件">

附件

<inputname= "attach"type = "FILE" id= "attach"size = "50" >

<inputname= "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"

@interfaceUploadViewController : 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

NSStringEncodingenc= 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

constchar*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：