XML请求数据和解析

对JSON习以为常之后，使用XML多少有点不习惯。其实二者差不多。这里讲述一下iOS自带的NSXMLParserDelegate的使用。

1.头文件中声名协议<NSXMLParserDelegate>，定义两个方法：-(void)postRequest 和 -(void)startParser:(NSData*)_data，定义对象：NSData *responseData（后台返回的NSData）、NSString *currentTagName（解析时获取到的当前字段）、NSMutableArray *name（我用来存储解析出来的name字段的数组）、NSMutableArray *code（我用来存储解析出来的code字段的数组）、NSMutableDictionary *regionDic（我用来存储将name和code对映的Dictionary）；

2.源文件中实现，代码如下：

-(void)postRequest
{
    //prepar request
    NSString *urlString = [NSString stringWithFormat:@"http://122.113.26.11/golive/api/loadRegionList.do"];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init] ;
    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@"POST"];
    
    //set headers 设置contentType和HTTPHeaderField
    NSString *contentType = [NSString stringWithFormat:@"text/xml"];
    [request addValue:contentType forHTTPHeaderField: @"Content-Type"];
    
    //create the body 在此处拼接XML字段，将每段尖括号的内容拆开拼接起来
    NSMutableData *postBody = [NSMutableData data];
    //    [postBody appendData:[[NSString stringWithFormat:@"<xml>"] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[[NSString stringWithFormat:@"<?xml version="1.0" encoding="utf-8"?>"] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[[NSString stringWithFormat:@"<request website="http://XXXXXXXXXXXXXX">"] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[[NSString stringWithFormat:@"<device devmodel="" dnum="" didtoken="" dver=""/>"] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[[NSString stringWithFormat:@"<live mac="XXXXX" deviceid="" livetoken="" livever=""/>"] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[[NSString stringWithFormat:@"</parameter>"] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[[NSString stringWithFormat:@"</request>"] dataUsingEncoding:NSUTF8StringEncoding]];
 
    //post
    [request setHTTPBody:postBody];
    
    //get response
    NSHTTPURLResponse* urlResponse = nil;
    NSError *error = [[NSError alloc] init];
    self.responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];
    NSString *result = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
    NSLog(@"regionResponse Code: %ld",(long)[urlResponse statusCode]);

    if ([urlResponse statusCode] >= 200 && [urlResponse statusCode] < 300) {
        NSLog(@"regionResponse: %@",result);
        
        //这里获取到服务器返回的内容
        
    }
    
    NSString* aStr;
    aStr = [[NSString alloc] initWithData:postBody encoding:NSASCIIStringEncoding];
    NSLog(@"reg==========%@",aStr);
}

//自定义一个 PraxMovie 方法，参数时NSDate型的数据，用来传递接受到的数据
- (void)startParser:(NSData*)data
{
    //NSXMLParser解析xml格式的数据，在这里初始化，并赋值
    NSXMLParser* parser = [[NSXMLParser alloc]initWithData:data];
    parser.delegate = self;
    [parser parse];
    NSLog(@"解析完成。。。");
}

//文档出错的时候触发
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError
{
    NSLog(@"%@",parseError);
}

//遇到一个开始标签时候触发
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName
  namespaceURI:(NSString *)namespaceURI
 qualifiedName:(NSString *)qualifiedName
    attributes:(NSDictionary *)attributeDict
{
    self.currentTagName = elementName;
	//region是需要解析的内容所对应的字段
    if ([currentTagName isEqualToString:@"region"]) {       
	//name和code是需要解析的内容所对应的字段
        [self.name addObject:[attributeDict objectForKey:@"name"]];
        [self.code addObject:[attributeDict objectForKey:@"code"]];
        [self.regionDic setObject:[attributeDict objectForKey:@"code"] forKey:[attributeDict objectForKey:@"name"]];
        
        NSLog(@"language:%@;code:%@",[attributeDict objectForKey:@"name"],[attributeDict objectForKey:@"code"]);
    }
    
}

//遇到结束标签时候出发
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName
  namespaceURI:(NSString *)namespaceURI
 qualifiedName:(NSString *)qName;
{
    self.currentTagName = nil;
}

（编辑：李大同）

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