ios23- 文件下载（同步和异步）

1.第一步：创建一个单例视图

#import <UIKit/UIKit.h>

@interface ios23_downViewController : UIViewController<NSURLConnectionDelegate,NSURLConnectionDataDelegate>{

NSMutableData *connectionData;

}

-(IBAction)tongbu;

-(IBAction)yibu;

@property (nonatomic,retain) NSMutableData *connectionData;

@end

2

//

//  ios23_downViewController.m

//  ios23-down

//

//  Created by  on 13-6-17.

//  Copyright 2013年 __MyCompanyName__. All rights reserved.

//

#import "ios23_downViewController.h"

@implementation ios23_downViewController

@synthesize connectionData;

- (void)didReceiveMemoryWarning

{

[super didReceiveMemoryWarning];

// Release any cached data, images, etc that aren't in use.

}

#pragma mark - View lifecycle

-(IBAction)tongbu{

NSLog(@"同步");

NSError *err;

//定义url

NSString *url=@"http://172.22.65.38/new/1.doc";

//构建NSURL

NSURL *fileUrl=[NSURL URLWithString:url];

//构建nsurlrequest

NSURLRequest *request=[[NSURLRequest alloc]initWithURL:fileUrl];

//建立连接

NSData *data=[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:&err];

) {

NSString *savePath=[[NSHomeDirectory()stringByAppendingPathComponent:@"documents"]stringByAppendingPathComponent:@"test.zip"];

//当数据写入的时候

if ([data writeToFile:savePath atomically:YES]) {

NSLog(@"保存成功");

}else{

NSLog(@"保存失败");

}

}

}

-(IBAction)yibu{

NSLog(@"异步");

NSError *err;

//定义url

NSString *url=@"http://172.22.65.38/new/1.doc";

//构建NSURL

NSURL *fileUrl=[NSURL URLWithString:url];

//构建nsurlrequest

NSURLRequest *request=[[NSURLRequest alloc]initWithURL:fileUrl];

//建立连接

NSData *data=[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:&err];

NSURLConnection *conn=[[NSURLConnection alloc]initWithRequest:request delegate:self];

//初始化connectionData;

connectionData=[[NSMutableData alloc]init ];

}

//接受数据

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{

//获取服务器传递的数据

[connectionData appendData:data];

}

//接收数据成功

-(void)connectionDidFinishLoading:(NSURLConnection *)connection{

) {

NSString *savePath=[[NSHomeDirectory()stringByAppendingPathComponent:@"documents"]stringByAppendingPathComponent:@"test.zip"];

//当数据写入的时候

if ([connectionData writeToFile:savePath atomically:YES]) {

NSLog(@"保存成功");

}else{

NSLog(@"保存失败");

}

}}

//接收数据失败

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{}

- (void)viewDidLoad

{

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

}

- (void)viewDidUnload

{

[super viewDidUnload];

// Release any retained subviews of the main view.

// e.g. self.myOutlet = nil;

}

- (void)viewWillAppear:(BOOL)animated

{

[super viewWillAppear:animated];

}

- (void)viewDidAppear:(BOOL)animated

{

[super viewDidAppear:animated];

}

- (void)viewWillDisappear:(BOOL)animated

{

[super viewWillDisappear:animated];

}

- (void)viewDidDisappear:(BOOL)animated

{

[super viewDidDisappear:animated];

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

// Return YES for supported orientations

return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);

}

@end