ASIHTTPRequest系列(三)：文件上傳

時間 2019-12-05

標籤 asihttprequest 系列文件上傳简体版

原文原文鏈接

5、文件上傳html

一、服務端java

文件上傳須要服務端的配合。咱們可在本機搭建tomcat測試環境。關於tomcat在MacOSX下的安裝配置，參考做者另外一博文《安裝Tomcat到Mac OSX》。web

打開Eclipse，新建web工程。在其中新建一個ServletUploadServlet：apache

import java.io.*;數組

import java.util.*;緩存

importjavax.servlet.ServletException;tomcat

importjavax.servlet.http.HttpServlet;iphone

importjavax.servlet.http.HttpServletRequest;jsp

importjavax.servlet.http.HttpServletResponse;ide

importorg.apache.commons.fileupload.FileItem;

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

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

public class UploadServletextends HttpServlet {

private boolean isMultipart;

private String filePath,title;

private int maxFileSize = 500 * 1024;

private int maxMemSize = 4 * 1024;

private File file ;

public void init( ){

// 從web.xml的context_param中得到上傳文件目錄（/data）.

filePath =

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

}

public voiddoPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,java.io.IOException {

// 檢查表單是否帶有 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;

}

DiskFileItemFactoryfactory = new DiskFileItemFactory();

// 內存最大可緩存尺寸

factory.setSizeThreshold(maxMemSize);

// 指定當數據超過內存最大可緩存尺寸時，臨時文件的目錄

factory.setRepository(new File(filePath+"temp"));

// 文件上傳對象

ServletFileUpload upload = new ServletFileUpload(factory);

// 設置文件上傳最大容許尺寸

upload.setSizeMax( maxFileSize );

try{

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

out.println("<html>");

out.println("<head>");

out.println("<title>Servletupload</title>");

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

out.println("<body>");

// 獲取multipart/form-data內容，其中每一個field被分紅不一樣part

List fileItems = upload.parseRequest(request);

// 枚舉每一個field

Iterator i = fileItems.iterator();

while ( i.hasNext () )

{

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

if ( !fi.isFormField() ) // 若是field爲File

{

// 獲取field的name或id

String fieldName = fi.getFieldName();

String fileName = fi.getName();

// 文件名中文處理

fileName=newString(fileName.getBytes(),"gbk");

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

String contentType = fi.getContentType();

boolean isInMemory= fi.isInMemory();

long sizeInBytes= fi.getSize();

// 把上傳數據寫入本地磁盤

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{// 若是field爲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 voiddoGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,java.io.IOException {

throw new ServletException("GET method used with " +

getClass( ).getName( )+": POSTmethod required.");

}

再新建一個upload.jsp頁面做爲測試：

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

<html>

<head>

<title>fbysss UploadBean 示例</title>

</head>

</form>

</html>

將工程部署到tomcat中，啓動tomcat，訪問http://localhost:8080/test/upload.jsp，顯示界面以下：

選擇一個文件進行上傳，而後到/data目錄下檢查該文件是否上傳成功。

二、iPhone客戶端

新建類，選擇UIViewController subclass，並勾上「WithXIB for user interface」，命名爲 UploadViewController。

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

在Xcode中聲明必要的變量和 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

將全部出口正確地鏈接到 UpdateController.xib 中，保存。

打開MainWindow.xib，拖一個UIViewController進去並將其Identifier改成UpdateController，再將它鏈接到Window對象的的rootViewController。

編寫 UIButton 的 Touch up inside 事件代碼以下：

-(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 編碼，由於 servlet 只識別GBK

NSStringEncoding enc=CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingMacChineseSimp);

[request setStringEncoding:enc];

[self printBytes:s encoding:enc];// 打印GBK編碼字符

[request setPostValue:s forKey:@"title"];

[request setFile:@"/Users/kmyhy/Documents/iphone/Iphone開發介紹.doc" forKey:@"attach"];

[request setDelegate:self];

[request setDidFinishSelector:@selector(responseComplete)];

[request setDidFailSelector:@selector(responseFailed)];

[button setEnabled:NO];

[request startSynchronous];

}

-(void)responseComplete{

// 請求響應結束，返回responseString

NSString*responseString = [request responseString];

[webView loadHTMLString:responseStringbaseURL:url];

[button setEnabled:YES];

}

-(void)respnoseFailed{

//請求響應失敗，返回錯誤信息

NSError *error = [request error];

[webView loadHTMLString:[error description] baseURL:url];

[button setEnabled:YES];

}

-(void)printBytes:(NSString *)strencoding:(NSStringEncoding)enc{

NSLog(@"defaultCStringEncoding:%d",[NSString defaultCStringEncoding]);

// 根據給定的字符編碼，打印出編碼後的字符數組

const char *bytes=[str cStringUsingEncoding:enc];

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

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

}

編譯、運行。點擊go按鈕，程序運行效果以下：

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