XML.JSON数据接口解析

来源：互联网发布：vue.js highcharts 编辑：程序博客网时间：2024/05/14 10:54

XML解析

1. SAX 解析: Simple API for XML 利用代理的三个方法来实现逐行解析

创建:一个类 SAXXMLPaser

SAXXMLPaser.h

//优点: 数据损坏的时候可以读取未损坏之前的数据

//缺点: 数据写错的时候就会直接结束不继续解析

@interface SAXXMLPaser : NSObject<NSXMLParserDelegate]] > //xml SAX解析的代理协议

@property (nonatomic,retain)NSString * currentString;//储存每个叶子节点的字符串

@property (nonatomic,retain)NSMutableArray * dataArr;//存储所有的学生对象

//开始解析

- (void)startPaser;

SAXXMLPaser.m

- (instancetype)init

{

self = [super init];

if (self) {

self.dataArr = [NSMutableArray array];

}

return self;

}

- (void)dealloc

{

[self.dataArr release];

[self.currentString release];

[super dealloc];

}

- (void)startPaser

{

//1.获得要解析的数据

NSString * xmlPath = [[NSBundle mainBundle] pathForResource:@"Student" ofType:@"XML"];//文件途径

NSData * data = [NSData dataWithContentsOfFile:xmlPath];

//检验是否成功转换成字符串

NSString * str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

NSLog(@"%@",str);

//xml SAX解析使用的类

NSXMLParser * xmlPaser = [[NSXMLParser alloc] initWithData:data];

//1.设置代理

xmlPaser.delegate = self;

//2.开始解析

[xmlPaser parse];

}

#warning 当他遇到前面的节点节点头

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict

{

NSLog(@"%@",elementName);

//通过判断节点名 student 来创建学生

if([elementName isEqualToString:@"student"]) {

Student * student = [[Student alloc] init];

//将对象加入到数组中

[self.dataArr addObject:student];

[student release];

}

#warning 遇到里面的内容的时候会走这个方法节点内容

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string

{

NSLog(@"%@",string);

//存储当前的字符串

self.currentString = string;

}

#warning 当遇到后面那个节点的时候调用方法

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName

{

Student * student = [self.dataArr lastObject];

//将字符串

if([elementName isEqualToString:@"name"]) {

student.name = self.currentString;

}

else if ([elementName isEqualToString:@"sex"]) {

student.sex = self.currentString;

}

else if([elementName isEqualToString:@"number"]) {

student.number = [self.currentString integerValue];

}

NSLog(@"%@",elementName);

}

1. DOMXML解析节点状解析

(1)首先需要使用到第三方的类GDataXMLNode.h GDataXMLNode.m

// libxml includes require that the target Header Search Paths contain

// /usr/include/libxml2

// and Other Linker Flags contain

// -lxml2

-1.根据提示搜索Header Search Paths 添加进去 /usr/include/libxml2

-2.根据提示搜索Other Linker Flags 添加进去 -lxml2

(2)创建一个类:DOMXMLPaser

DOMXMLPaser.h

- (void)startPaser;

@property (nonatomic,retain)NSMutableArray * dataArr;

DOMXMLPaser.m

- (instancetype)init

{

self = [super init];

if (self) {

self.dataArr = [NSMutableArray array];

}

return self;

}

- (void)dealloc

{

[self.dataArr release];

[super dealloc];

}

- (void)startPaser

{

//1.获取数据

NSString * domPath = [[NSBundle mainBundle] pathForResource:@"Student" ofType:@"XML"];

NSData * data = [NSData dataWithContentsOfFile:domPath];

NSString * str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

NSLog(@"%@",str);

//2.解析数据

NSError * error = nil;//创建一个错误指针

GDataXMLDocument * document = [[GDataXMLDocument alloc] initWithData:data options:GDataXMLDocumentKind error:&error];

if (error != nil) {

NSLog(@"错误信息: %@",error);

}

//解析1.获得结构的根节点

GDataXMLElement * rootElement = [document rootElement];

//解析2.获得根节点的子节点

//根据节点名字获得

NSArray * arr = [rootElement elementsForName:@"student"];

//解析3.对数组进行遍历

for (GDataXMLElement * node in arr) {

//对子节点node的子节点name 解析

NSArray * nameNodes = [node elementsForName:@"name"];

GDataXMLElement * nameNode = [nameNodes lastObject];

//将节点转变为字符串(这个类自己带的)

NSString * name = [nameNode stringValue];

NSArray * sexNodes = [node elementsForName:@"sex"];

GDataXMLElement * sexNode = [sexNodes lastObject];

NSString * sex = [sexNode stringValue];

NSArray * numberNodes = [node elementsForName:@"number"];

GDataXMLElement * numberNode = [numberNodes lastObject];

NSInteger number = [[numberNode stringValue] integerValue];

NSLog(@"name : %@ sex: %@,number : %d",name,sex,number);

}

一.JSON解析不需要创建一个类

//1.获取文件参数1:文件名参数2:文件类型

NSString * jsonPath = [[NSBundle mainBundle] pathForResource:@"JSON" ofType:@"txt"];

NSData * data = [NSData dataWithContentsOfFile:jsonPath];

NSString * str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

NSLog(@"%@",str);

//2.解析

NSError * error = nil;

NSMutableArray * arr = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];

//将字典或者字符串转换为JSON类型的

// NSJSONSerialization dataWithJSONObject:<#(id)#> options:<#(NSJSONWritingOptions)#> error:<#(NSError **)#>

NSLog(@"%@",arr);

for (NSMutableDictionary * dic in arr) {

Student * student = [[Student alloc] init];

student.name = [dic objectForKey:@"name"];

student.sex = [dic objectForKey:@"sex"];

student.number = [[dic objectForKey:@"number"] intValue];

NSLog(@"%@ %@ %d",student.name,student.sex,student.number);

}

0 0