IOS中XML解析之NSXMLParser

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NSXMLParser解析XML数据 用法如下：一、首先，必须继承NSXMLParserDelegate协议 @interface ViewController : UIViewController<NSXMLParserDelegate> 二、设置XML数据，并初始化NSXMLParser： 1、从本地XML文件中读取数据 NSString *strPathXml = [[NSBundle mainBundle] pathForResource:@"group" ofType:@"xml"]; NSData *xmlData = [[NSData alloc] initWithContentsOfFile:strPathXml];NSXMLParser *parserXML = [[NSXMLParser alloc] initWithData:xmlData]; [parser setShouldProcessNamespaces:NO]; [parser setShouldReportNamespacePrefixes:NO]; [parser setShouldResolveExternalEntities:NO]; [parser setDelegate:self]; [parser parse]; [parser release]; 2、从接口Java Servlet中获取数据 NSString *nstrYwKPIUrl = [[NSString alloc]initWithFormat:@"%@?citys=%@&startTime=%@&endTime=%@&indexNames=%@",YWKPIURL,city,startTime,endTime,zbz]; //Servlet访问地址与传递参数 NSString *encodedURL = [nstrYwKPIUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; //对Servlet访问地址进行编码 NSLog(@"encodedURL is %@",encodedURL); NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:[NSURL URLWithString:encodedURL ]]; [parser setShouldProcessNamespaces:NO]; [parser setShouldReportNamespacePrefixes:NO]; [parser setShouldResolveExternalEntities:NO]; parser.delegate = self; [parser parse]; [parser release];三、解析XML数据 1、遍例xml的节点，执行以下代理方法 -(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict { xmlelement = [[NSString alloc]initWithString:elementName]; //xmlelement为XML元素节点(xmlelement为字符串变量，是在.h文件中定义的。) } 2、当xml节点有值时，则执行以下代理方法 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { if ([xmlelement isEqualToString:@"START_TIME"]) { [ywKPI.times addObject:[string substringToIndex:10]]; } //START_TIME XML文件内容节点，ywKPI.times 数组对象，string xml文件START_TIME 节点值。 以下类似。 if ([xmlelement isEqualToString:@"REGION_USERLABEL"]) { [ywKPI.citys addObject:string]; } if ([xmlelement isEqualToString:@"BHTIME_CS"]) { [ywKPI.dlymss addObject:string]; } if ([xmlelement isEqualToString:@"BHTIME_PS"]) {  [ywKPI.fzymss addObject:string]; } if ([xmlelement isEqualToString:@"GSM_NET_RATE"]) { NSString *gsmwljtl =[[NSString alloc]initWithFormat: @"%@%@",[NSString stringWithFormat:@"%.2f",[string floatValue]],@"%"]; [ywKPI.gsmwljtls addObject:gsmwljtl]; } } 3、当遇到XML节点结束标记时，执行以下代理方法 -(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName { xmlelement = nil;//xmlelement为字符串变量，是在.h文件中定义的。 }