iphone开发之iphone解析xml&json-1

解析XML文件示例.
代码1和代码2是IOS开发的基本内容。
代码1.
#import <UIKit/UIKit.h>
 
@class XmlTestViewController;
 
@interface XmlTestAppDelegate : NSObject <UIApplicationDelegate> {
    UIWindow *window;
    XmlTestViewController *viewController;
}
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet XmlTestViewController *viewController;
 
@end
 
　　代码2
 1 #import "XmlTestAppDelegate.h"
 2 #import "XmlTestViewController.h"
 3 @implementation XmlTestAppDelegate
 4 @synthesize window;
 5 @synthesize viewController;
 6 #pragma mark -
 7 #pragma mark Application lifecycle
 8 - (BOOL)application:(UIApplication *)application
 9     didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {   
10     [window addSubview:viewController.view];
11     [window makeKeyAndVisible];
12     return YES;
13 }
14 - (void)applicationWillResignActive:(UIApplication *)application {}
15 - (void)applicationDidEnterBackground:(UIApplication *)application {}
16 - (void)applicationWillEnterForeground:(UIApplication *)application {}
17 - (void)applicationDidBecomeActive:(UIApplication *)application {}
18 - (void)applicationWillTerminate:(UIApplication *)application {}
19 - (void)applicationDidReceiveMemoryWarning:(UIApplication *)application {}
20 - (void)dealloc {
21     [viewController release];
22     [window release];
23     [super dealloc];
24 }
25 @end

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代码3是controller的头文件。
　代码3

#import <UIKit/UIKit.h>
 
@interface XmlTestViewController : UIViewController {
}
@end
　　controller的实现文件。在这声明了一个xml格式，NSString类型的字符串。并用代码5和代码6定义的类解析。
　　代码4
#import "XmlTestViewController.h"
#import "FirstXmlParse.h"
@implementation XmlTestViewController

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
    NSString *xml=@"<xml>"
    "<title>标题</title>"
    "<content>内容描述</content>"
    "<time>2011-1-1</time>"
    "</xml>";
   
    FirstXmlParse *first=[[FirstXmlParse alloc] init];
    [first startParse:xml];
    NSLog(@"title:%@",first.title);
    NSLog(@"content:%@",first.content);
    NSLog(@"time:%@",first.time);
}

/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)dealloc {
    [super dealloc];
}
@end

 
　代码5

#import <Foundation/Foundation.h>
 
@interface FirstXmlParse : NSObject<NSXMLParserDelegate> {
    NSString *title;
    NSString *content;
    NSString *time;
    //定义一个可变字符串
    NSMutableString *contentString;
}
@property(nonatomic,retain)NSString *title;
@property(nonatomic,retain)NSString *content;
@property(nonatomic,retain)NSString *time;
@property(nonatomic,retain)NSMutableString *contentString;
-(void)startParse:(NSString *)xml;
@end
　　代码6.这是解析xml文件的关键内容。
#import "FirstXmlParse.h"

@implementation FirstXmlParse
@synthesize title;
@synthesize content;
@synthesize time;
@synthesize contentString;

-(void)startParse:(NSString *)xml{
    NSData *data=[xml dataUsingEncoding:NSUTF8StringEncoding];
    //创建xml解析器
    NSXMLParser *xmlParse=[[NSXMLParser alloc] initWithData:data];
    //设置委托
    [xmlParse setDelegate:self];
    [xmlParse parse];
}

//解析文档开始
- (void)parserDidStartDocument:(NSXMLParser *)parser{
    NSLog(@"解析文档开始");
}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
   NSLog(@"遇到启始标签:%@",elementName);
    self.contentString=[NSMutableString string];
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
    NSLog(@"遇到内容:%@",string);
    [self.contentString appendString:string];
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
   NSLog(@"遇到结束标签:%@",elementName);
    if ([elementName isEqualToString:@"title"]) {
         title=contentString;
    }
    if ([elementName isEqualToString:@"content"]) {
        content=contentString;
    }
    if ([elementName isEqualToString:@"time"]) {
        time=contentString;
    }
}

//解析文档结束
- (void)parserDidEndDocument:(NSXMLParser *)parser{
    NSLog(@"文档解析结束");
}
@end