原文地址：

 

// 解析网络文件

- (IBAction)networkXML:(id)sender {     NSURL *url = [NSURL URLWithString:                       @"     // 创建请求     NSMutableURLRequest* request = [[NSMutableURLRequest alloc] init];        [request setURL:url];        [request setHTTPMethod:@"GET"];             NSHTTPURLResponse* response;        // 调用同步请求得到数据     NSData* data =         [NSURLConnection sendSynchronousRequest:request                                  returningResponse:&response                                           error:nil];       // 得到XML文本并转码     self.xmlString =         [[NSString alloc] initWithData:data                               encoding: CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)];         [self parseGDataXML];     }

// 解析本地文件

- (IBAction)localXML:(id)sender {     // 先将要操作的文件拷贝到Documents目录下         // 得到资源文件路径     NSString *path = [[NSBundle mainBundle] pathForResource:@"party" ofType:@"xml"];     // 得到Documents路径     NSString *home = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];     NSString *homePath = [home stringByAppendingPathComponent:@"party.xml"];         // 文件管理器     NSFileManager *manager = [NSFileManager defaultManager];         NSError *error;     // 判断文件是否存在     if ([manager fileExistsAtPath:homePath]) {         // 如果存在就先删除(根据需求也可以选择什么也不做)         //[manager removeItemAtPath:homePath error:&error];         //[manager copyItemAtPath:path toPath:homePath error:&error];     }else {         // 将文件拷贝到可操作的Documents文件夹         [manager copyItemAtPath:path toPath:homePath error:&error];     }         // 得到XML文件内容     self.xmlString = [[NSString alloc] initWithContentsOfFile:homePath encoding:NSUTF8StringEncoding error:nil];         [self parseGDataXML]; }

// GDataXML方式解析

- (void)parseGDataXML {     textView.text = @"";         NSError *error;     // 加载XML文件     GDataXMLDocument *doc = [[GDataXMLDocument alloc]                              initWithXMLString: self.xmlString                              options:0                              error:&error];         if (doc == nil) { return; }         NSLog(@"LOG=%@", [[NSString alloc] initWithData:doc.XMLData encoding:NSUTF8StringEncoding]);         NSMutableString *resultString = [[NSMutableString alloc] initWithString:@"XML数据内容: \n"];         // 解析         // 使用XPath语法     NSArray *partyMembers = [doc.rootElement nodesForXPath:@"//Party/Player" error:nil];     for (GDataXMLElement *partyMember in partyMembers) {                 NSString *_name;         NSString *_level;         NSString *_class;                 // Name         NSArray *names = [partyMember elementsForName:@"Name"];         if (names.count > 0) {             GDataXMLElement *firstName = (GDataXMLElement *) [names objectAtIndex:0];             _name = firstName.stringValue;         } else continue;                 // Level         NSArray *levels = [partyMember elementsForName:@"Level"];         if (levels.count > 0) {             GDataXMLElement *firstLevel = (GDataXMLElement *) [levels objectAtIndex:0];             _level = firstLevel.stringValue;         } else continue;                 // Class         NSArray *classes = [partyMember elementsForName:@"Class"];         if (classes.count > 0) {             GDataXMLElement *firstClass = (GDataXMLElement *) [classes objectAtIndex:0];             _class = firstClass.stringValue;                     } else continue;                 [resultString appendFormat:@"Name=%@",_name ];         [resultString appendFormat:@" Level=%@",_level ];         [resultString appendFormat:@" Class=%@\n",_class ];             }         textView.text = resultString; }

// 写文件

- (IBAction)saveXML:(id)sender {         // 创建XML节点     GDataXMLElement * partyElement = [GDataXMLNode elementWithName:@"Party"];     GDataXMLElement * playerElement = [GDataXMLNode elementWithName:@"Player"];     GDataXMLElement * nameElement = [GDataXMLNode elementWithName:@"Name" stringValue:@"zhang"];     GDataXMLElement * levelElement = [GDataXMLNode elementWithName:@"Level" stringValue:@"1"];         GDataXMLElement * classElement = [GDataXMLNode elementWithName:@"Class" stringValue:@"Rogue"];         // 创建XML层次结构     [playerElement addChild:nameElement];     [playerElement addChild:levelElement];     [playerElement addChild:classElement];     [partyElement addChild:playerElement];

    // 创建XML文件

    GDataXMLDocument *document = [[GDataXMLDocument alloc] initWithRootElement:partyElement];     NSData *xmlData = document.XMLData;         // 得到输出路径     NSString *homePath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"party.xml"];

    NSLog(@"Saving xml data to %@...", homePath);

    // 输出     [xmlData writeToFile:homePath atomically:YES];   }