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iOS开发之解析XML数据
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XML解析主要可以使用CData,libxml2以及NSXMLParser三種方式。
一、CDataXML
#import <Foundation/Foundation.h>@interface FKBook : NSObject
@property (nonatomic , assign) NSInteger bookID;
@property (nonatomic , copy) NSString *title;
@property (nonatomic , copy) NSString *author;
@property (nonatomic , copy) NSString *remark;
@end#import "FKBook.h"@implementation FKBook
@synthesize bookID,title,author,remark;
@end
#import <Foundation/Foundation.h>@interface FKBooksParser : NSObject
- (NSArray*) parseXML:(NSString*) xmlName;
@end#import "FKBooksParser.h"
#import "FKBook.h"
#import "GDataXMLNode.h"@implementation FKBooksParser- (NSArray*) parseXML:(NSString*) xmlName {// 使用NSBundle對象獲取到需要解析的XML文檔的路徑NSString *path = [[NSBundle mainBundle] pathForResource:xmlNameofType:@"xml"];// 使用NSFileHandle對象根據文件路徑獲取到文件NSFileHandle *file = [NSFileHandle fileHandleForReadingAtPath:path];// 讀取文件內容返回NSData對象NSData *data = [file readDataToEndOfFile];// 根據NSData對象初始化GDataXMLDocument對象GDataXMLDocument *doc = [[GDataXMLDocument alloc] initWithData:dataoptions:0 error:nil];// 如果需要根據XML字符串來初始化GDataXMLDocument對象，則調用如下代碼
// GDataXMLDocument *doc = [[GDataXMLDocument alloc] initWithXMLString:xmlStr
// options:0 error:nil];// 獲取根元素，也就是獲取<books.../>元素GDataXMLElement *rootElement = [doc rootElement];// 獲取rootElement下所有<book.../>元素，返回所有<book.../>元素組成的集合NSArray *bookElements = [rootElement elementsForName:@"book"];// 初始化一個可變數組,用于存儲將要獲取的所有<book.../>元素的內容NSMutableArray *books = [[NSMutableArray alloc] init];// 循環遍歷每一個<book.../>元素for(GDataXMLElement *bookElement in bookElements){// 初始化FKBook對象FKBook *book = [[FKBook alloc] init];// 獲取id屬性值,并且轉成整形NSInteger bookID = [[[bookElement attributeForName:@"id"]stringValue] integerValue];// 獲取title,author,remark元素內容NSString *title = [[[bookElement elementsForName:@"title"]objectAtIndex:0] stringValue];NSString *author = [[[bookElement elementsForName:@"author"]objectAtIndex:0] stringValue];NSString *remark = [[[bookElement elementsForName:@"remark"]objectAtIndex:0] stringValue];// 將獲取的屬性值和元素內容存儲到FKBook對象的屬性中book.bookID = bookID;book.title = title;book.author = author;book.remark = remark;//將每一個Book對象添加到可變數組[books addObject:book];}//返回books集合的副本return [books copy];
}
@end
- 創建FKViewController : UITableViewController
#import "FKViewController.h"
#import "FKBooksParser.h"
#import "FKBook.h"@implementation FKViewController
NSArray* books;
- (void)viewDidLoad {[super viewDidLoad];// 獲取FKBooksParser實例對象FKBooksParser* booksParser = [[FKBooksParser alloc] init];// 解析XML文檔，獲取解析得到的NSArray集合books =[booksParser parseXML:@"books"];
}- (NSInteger)tableView:(UITableView *)tableViewnumberOfRowsInSection:(NSInteger)section {// books屬性包含多少個元素，此處就顯示多少個表格行。return books.count;
}- (UITableViewCell *)tableView:(UITableView *)tableViewcellForRowAtIndexPath:(NSIndexPath *)indexPath {// 獲取可重用的單元格UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"bookCell" forIndexPath:indexPath];// 從可重用單元格中根據Tag分別取出3個UILabel控件UILabel* titleLabel = (UILabel*)[cell viewWithTag:1];UILabel* authorLabel = (UILabel*)[cell viewWithTag:2];UILabel* remarkLabel = (UILabel*)[cell viewWithTag:3];FKBook* book = [books objectAtIndex:indexPath.row];// 為3個UILabel設置文本titleLabel.text = book.title;authorLabel.text = book.author;remarkLabel.text = book.remark;return cell;
}
@end
二、libxml2XML
#import <Foundation/Foundation.h>@interface FKBook : NSObject
@property (nonatomic , assign) NSInteger bookID;
@property (nonatomic , copy) NSString *title;
@property (nonatomic , copy) NSString *author;
@property (nonatomic , copy) NSString *remark;
@end#import "FKBook.h"@implementation FKBook
@synthesize bookID,title,author,remark;
@end
#import <Foundation/Foundation.h>@interface FKBooksParser : NSObject
- (NSArray*) parseXML:(NSString*) xmlName;
@end#import "FKBooksParser.h"
#import "FKBook.h"
#import "GDataXMLNode.h"@implementation FKBooksParser- (NSArray*) parseXML:(NSString*) xmlName {// 使用NSBundle對象獲取到需要解析的XML文檔的路徑NSString *path = [[NSBundle mainBundle] pathForResource:xmlNameofType:@"xml"];// 使用NSFileHandle對象根據文件路徑獲取到文件NSFileHandle *file = [NSFileHandle fileHandleForReadingAtPath:path];// 讀取文件內容返回NSData對象NSData *data = [file readDataToEndOfFile];// 根據NSData對象初始化GDataXMLDocument對象GDataXMLDocument *doc = [[GDataXMLDocument alloc] initWithData:dataoptions:0 error:nil];// 如果需要根據XML字符串來初始化GDataXMLDocument對象，則調用如下代碼
// GDataXMLDocument *doc = [[GDataXMLDocument alloc] initWithXMLString:xmlStr
// options:0 error:nil];// 獲取根元素，也就是獲取<books.../>元素GDataXMLElement *rootElement = [doc rootElement];// 獲取rootElement下所有<book.../>元素，返回所有<book.../>元素組成的集合NSArray *bookElements = [rootElement elementsForName:@"book"];// 初始化一個可變數組,用于存儲將要獲取的所有<book.../>元素的內容NSMutableArray *books = [[NSMutableArray alloc] init];// 循環遍歷每一個<book.../>元素for(GDataXMLElement *bookElement in bookElements){// 初始化FKBook對象FKBook *book = [[FKBook alloc] init];// 獲取id屬性值,并且轉成整形NSInteger bookID = [[[bookElement attributeForName:@"id"]stringValue] integerValue];// 獲取title,author,remark元素內容NSString *title = [[[bookElement elementsForName:@"title"]objectAtIndex:0] stringValue];NSString *author = [[[bookElement elementsForName:@"author"]objectAtIndex:0] stringValue];NSString *remark = [[[bookElement elementsForName:@"remark"]objectAtIndex:0] stringValue];// 將獲取的屬性值和元素內容存儲到FKBook對象的屬性中book.bookID = bookID;book.title = title;book.author = author;book.remark = remark;//將每一個Book對象添加到可變數組[books addObject:book];}//返回books集合的副本return [books copy];
}
@end
- 創建FKViewController : UITableViewController
#import "FKViewController.h"
#import "FKBooksParser.h"
#import "FKBook.h"@implementation FKViewController
FKBooksParser* booksParser;
- (void)viewDidLoad {[super viewDidLoad];// 獲取FKBooksParser實例對象booksParser = [[FKBooksParser alloc] init];// 解析XML文檔[booksParser readXml:@"books"];
}- (NSInteger)tableView:(UITableView *)tableViewnumberOfRowsInSection:(NSInteger)section {// booksParser的books屬性包含多少個元素，此處就顯示多少個表格行。return booksParser.books.count;
}- (UITableViewCell *)tableView:(UITableView *)tableViewcellForRowAtIndexPath:(NSIndexPath *)indexPath
{// 獲取可重用的單元格UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"bookCell" forIndexPath:indexPath];// 從可重用單元格中根據Tag分別取出3個UILabel控件UILabel* titleLabel = (UILabel*)[cell viewWithTag:1];UILabel* authorLabel = (UILabel*)[cell viewWithTag:2];UILabel* remarkLabel = (UILabel*)[cell viewWithTag:3];FKBook* book = [booksParser.books objectAtIndex:indexPath.row];// 為3個UILabel設置文本titleLabel.text = book.title;authorLabel.text = book.author;remarkLabel.text = book.remark;NSLog(@"---%d" , book.bookID);return cell;
}
@end
三、NSXMLParser
#import <Foundation/Foundation.h>@interface FKXMLPraserDelegate : NSObject <NSXMLParserDelegate>
// 定義一個NSMutableArray集合來保存解析XML文檔得到的數據
@property (nonatomic, strong) NSMutableArray *books;
@end#import "FKXMLPraserDelegate.h"
#import "FKBook.h"@implementation FKXMLPraserDelegate
// 定義一個FKBook對象，用于保存正在解析的<book>元素中的數據
FKBook* book;
NSString* currentElementValue;
// 當開始處理某個元素時觸發該方法
- (void) parser:(NSXMLParser *)parser didStartElement:(NSString *)elementNamenamespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qNameattributes:(NSDictionary *)attributeDict {NSLog(@"開始處理元素 %@" , elementName);if([elementName isEqualToString:@"books”]) {// 如果正在處理根元素，在此處初始化存儲解析結果的NSMutableArray集合self.books = [[NSMutableArray alloc] init];}// 如果正在處理<book.../>元素else if([elementName isEqualToString:@"book"]){// 初始化FKBook對象book = [[FKBook alloc] init];// 從attributeDict中讀取<book.../>元素的屬性id的值book.bookID = [[attributeDict objectForKey:@"id"] integerValue];}
}
// 當開始處理字符串內容時觸發該方法
-(void) parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {NSLog(@"處理字符串內容：%@",string);// 如果當前的字符串值不為nil，保存當前正在處理的元素的值if(string){currentElementValue = string;}}
// 當處理某個元素結束時觸發該方法
-(void) parser:(NSXMLParser *)parser didEndElement:(NSString *)elementNamenamespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {// 如果處理根元素結束，表明XML文檔處理完成。if([elementName isEqualToString:@"books"]){return;}// 如果處理<book.../>元素結束，則將封裝的FKBook對象添加到NSMutableArray集合中else if([elementName isEqualToString:@"book"]){[self.books addObject: book];book = nil;}else{// 如果既不是處理<books.../>元素，也不是處理<book.../>元素的時候,// 則使用KVC方式為當前FKBook對象的屬性賦值[book setValue:currentElementValue forKey:elementName];currentElementValue = nil;}
}
@end
總結
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