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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MacOSX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ServletUploadServlet：
import java.io.*;
import java.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;
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( ){
// 从web.xml的context_param中获得上传文件目录（/data）.
filePath =
getServletContext().getInitParameter("file-upload");
}
public voiddoPost(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;
}
DiskFileItemFactoryfactory = 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("<%@pagecontentType=‘text/html; charset=GBK‘%>");
out.println("<html>");
out.println("<head>");
out.println("<title>Servletupload</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+"<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 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“WithXIB 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:responseStringbaseURL: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 *)strencoding:(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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原文地址：http://my.oschina.net/u/2329800/blog/489693
