ASIHTTPRequest系列(三)：文件上传

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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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ASIHTTPRequest系列(四)：Cookies | ASIHTTPRequest系列(二)：文件下载

2011-06-03 15:35
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