ASIHTTPRequest 文件上传

鉴客 发布于 2012/01/09 16:41
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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( ){

      // web.xml 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 File

         {

            // 获取 field name 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 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 >

<!--meta http -equiv ="Content-Type" content="text/html ; charset =iso -8859-1"-->

<!--meta http -equiv ="Content-Type" content="text/html ; charset =gb2312"-->

</ 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。

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

 

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= ;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:

 

文章出处:http://blog.csdn.net/kmyhy/article/details/6524927

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