ASIHTTPRequest系列(三)：文件上传

亦凉 2022-06-11 04:36 195阅读 0赞

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\[i\]);  
\}  
\}