iOS中的数据解析(XML,JSON),SAX解析,DOM解析

第三方

SAT解析

#import "SAXTableViewController.h"
#import "Student.h"
@interface SAXTableViewController ()<NSXMLParserDelegate>
@property (nonatomic, retain) NSMutableArray *dataSourse; // 存储学生对象
@property (nonatomic, retain) Student *stu; // 保存当前学生对象
@property (nonatomic, copy) NSString *string; //保存当前读取到标签后的内容
@end

@implementation SAXTableViewController
//懒加载
- (NSMutableArray *)dataSourse
{
    if (!_dataSourse) {
        self.dataSourse = [NSMutableArray arrayWithCapacity:1];
    }
    return [[_dataSourse retain] autorelease];
}
- (void)dealloc
{
    self.dataSourse = nil;
    self.stu = nil;
    self.string = nil;
    [super dealloc];
}
/**
 *  解析:按照约定好(假象)的格式提取数据的过程叫做解析.数据提供方(后台)按照格式存放数据,数据提取(前端)按照格式提取数据.
 
    主流的数据结构:XML和JSON
    
 
    XML数据结构的特点:
    1.由标签组成,而且标签是成对存在,一对儿开始标签和结束标签叫做节点.
    2.节点可以有子节点和父节点,没有父节点的节点叫做根节点,没有子节点的叫做叶子节点.
    3.节点可以用来存储数据.
 
 XML解析原理:
 SAX解析:是一种基于事件回调的解析机制(主要通过代理方法进行解析),逐行解析,逐行读取数据,逐行写入内存,适合大数据的解析,效率比较低,系统解析就是这种方式.
 DOM解析:将数据全部读入内存,将数据读成树形结构,逐层解析,适用于小数据解析,效率比较高,第三方解析原理
 
 
 
 */
- (void)viewDidLoad {
    [super viewDidLoad];
    
    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;
    
    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}



#pragma mark -- 点击解析
- (IBAction)analysisBarButtonAction:(id)sender {
    
    [self.dataSourse removeAllObjects];
    
    //1.获取要解析文件的路径
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Student" ofType:@"xml"];
    //2.根据文件路径,初始化NSData对象
    NSData *data = [NSData dataWithContentsOfFile:filePath];
    //3.创建解析工具对象
    NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];
    //4.设置代理,监测解析过程
    parser.delegate = self;
    parser.shouldProcessNamespaces = YES;
    //5.开始解析
    [parser parse];
    [parser release];
    
    
}


#pragma mark -- NSXMLParserDelegate
//当读取到开始标签时触发
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
   
    
    //当读取到Student 开始标签时,创建Student对象
    if ([elementName isEqualToString:@"Student"]) {
        self.stu = [[[Student alloc] init] autorelease];
        //存储节点属性对应的数据
        self.stu.position = attributeDict[@"position"];
        NSLog(@"%@",attributeDict);
        
    }
    /*
     parser  解析工具对象,elementName 标签名字,
     namespaceUR I 命名空间的唯一标示,attributedict 节点中的属性,qName标签
     NSLog(@"%@",namespaceURI);
     NSLog(@"%@",qName);
     
     */
     
    
    
    
    
    
   
    
}
//2.当读取到标签后的内容
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
    self.string = string; // 保存读取到的标签后的内容
}
//当读取到结束标签触发
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
    if ([elementName isEqualToString:@"name"]) {
        self.stu.name = self.string;
    }else if ([elementName isEqualToString:@"gender"]){
        self.stu.gender = self.string;
    }else if ([elementName isEqualToString:@"age"]){
        self.stu.age = self.string;
    }else if ([elementName isEqualToString:@"phone"]){
        self.stu.phone = self.string;
    }else if ([elementName isEqualToString:@"motto"]){
        self.stu.phone = self.string;
    }else if([elementName isEqualToString:@"Student"])
    {
         [self.dataSourse addObject:self.stu];
    }
    //NSLog(@"%@",self.stu.name);
   
}

//结束标签后的内容
- (void)parserDidEndDocument:(NSXMLParser *)parser{
    NSLog(@"Game over");
    [self.tableView reloadData];
}




#pragma mark - Table view data source
//
//- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
//    return 1;
//}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    // Return the number of rows in the section.
    return self.dataSourse.count;
    
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"student" forIndexPath:indexPath];
    Student *data = self.dataSourse[indexPath.row];
    cell.textLabel.text = data.name;
    NSLog(@"%@",data.name);
    cell.detailTextLabel.text = data.position;
    return cell;
}


@end

DOM解析

#import "DOMTableViewController.h"
#import "GDataXMLNode.h"
#import "Student.h"

/**
 *  GDataXMLNode.h 是由Google 提供的开源的基于DOM工作原理的XML解析方式,底层是基于C语言的libxml12 动态链接库而封装的oc的使用方式,因此效率比较高
 
    //使用该类准备工作
    1.Build Phases -- 添加动态链接库 libxml2.2.dylib
    2.Build Setting ----- Header Search Paths -- 添加路径 /user/include/libxm12
 */
@interface DOMTableViewController ()


@property (nonatomic, retain) NSMutableArray *dataSource; //存储所有Student对象
@end

@implementation DOMTableViewController

//懒加载
- (NSMutableArray *)dataSource
{
    if (!_dataSource) {
        self.dataSource = [[NSMutableArray alloc] initWithCapacity:1];
    }
    return [[_dataSource retain] autorelease];
}


- (void)viewDidLoad {
    [super viewDidLoad];
    
    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;
    
    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source


//左侧 点击 RootParser
- (IBAction)btnRootParser:(id)sender {
    [self.dataSource removeAllObjects];
    //1.获取要解析的xml文件的路径
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Student.xml" ofType:nil];
    //2.根据文件路径初始化 NSString 对象
    //读取文本内容
    NSString *xmlString = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
    //3.将解析内容读入到GDataXMLDocument中
    GDataXMLDocument *document = [[GDataXMLDocument alloc] initWithXMLString:xmlString options:0 error:nil];
    //4.获取根节点(GDataXMLElement节点对象,GdataXMLNode属性对象)
    GDataXMLElement *rootElement = [document rootElement];
    //5.获取根节点下所有的Student节点
    NSArray *stuElements = [rootElement elementsForName:@"m:Student"];
    //6.获取Student 节点下的字节点
    for (GDataXMLElement *stuEle in stuElements) {
        //获取Student节点下得name节点
        GDataXMLElement *nameElement = [[stuEle elementsForName:@"m:name"] firstObject];
        //获取Student节点下得gender节点
        GDataXMLElement *genderElement = [[stuEle elementsForName:@"m:gender"] firstObject];
        //获取Student节点下得age节点
        GDataXMLElement *ageElement = [[stuEle elementsForName:@"m:age"] firstObject];
        //获取Student节点下得phone节点
        GDataXMLElement *phoneElement = [[stuEle elementsForName:@"m:phone"] firstObject];
        //获取Student节点下得motto节点
        GDataXMLElement *mottoElement = [[stuEle elementsForName:@"m:motto"] firstObject];
        Student *stu = [[Student alloc] init];
        //获取节点中的数据,数据妨碍开始标签与结束标签之间
        stu.name = [nameElement stringValue];
        stu.gender = [genderElement stringValue];
        stu.age = [ageElement stringValue];
        stu.phone = [phoneElement stringValue];
        stu.motto = [mottoElement stringValue];
        //获取节点中的属性对象
        GDataXMLNode *positionNode = [stuEle attributeForName:@"position"];
        stu.position = [positionNode stringValue];
        
        //Student 类型的对象,添加到数组(数据源)
        [self.dataSource addObject:stu];
        //释放
        [stu release];
    }
    NSLog(@"%@",self.dataSource);
   [self.tableView reloadData];
    [document release];
    
}

//右侧 点击 XPath
- (IBAction)btnXpath:(id)sender {
    //移除之前的数据源
    [self.dataSource removeAllObjects];

    //1.获取要解析的xml文件的路径
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Student.xml" ofType:nil];
    //2.根据文件路径初始化 NSString 对象
    //读取文本内容
    NSString *xmlString = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
    //3.将解析内容读入到GDataXMLDocument中
    GDataXMLDocument *document = [[GDataXMLDocument alloc] initWithXMLString:xmlString options:0 error:nil];
    
    //4.获取所有的叶子节点
    
    //4.1获取所有的name节点
    NSArray *nameElements = [document nodesForXPath:@"//m:name" error:nil];
    //4.2获取所有的gender节点
    NSArray *genderElements = [document nodesForXPath:@"//m:gender" error:nil];
    //4.3获取所有的age节点
    NSArray *ageElements = [document nodesForXPath:@"//m:age" error:nil];
    //4.4获取所有的phone节点
    NSArray *phoneElements = [document nodesForXPath:@"//m:phone" error:nil];
    //4.5获取所有的motto节点
    NSArray *mottoElements = [document nodesForXPath:@"//m:motto" error:nil];
    //4.6获取student节点
    NSArray *studentElements = [document nodesForXPath:@"//m:Student" error:nil];
    
    //循环次数
    int count = (int)studentElements.count;
    for (int i = 0; i < count; i++) {
        GDataXMLElement *nameEle = nameElements[i];
        GDataXMLElement *genderEle = genderElements[i];
        GDataXMLElement *ageEle = ageElements[i];
        GDataXMLElement *phoneEle = phoneElements[i];
        GDataXMLElement *mottoEle = mottoElements[i];
        
        GDataXMLNode *positionNode = [studentElements[i] attributeForName:@"position"];
        //将解析的对象,封装成Student对象
        Student *stu = [[Student alloc] init];
        stu.name = [nameEle stringValue];
        stu.gender = [genderEle stringValue];
        stu.age = [ageEle stringValue];
        stu.phone = [phoneEle stringValue];
        stu.motto = [mottoEle stringValue];
        stu.position = [positionNode stringValue];
        //添加到数组
        [self.dataSource addObject:stu];
        //释放
        [stu release];
        
    }
    
    //刷新界面
    [self.tableView reloadData];
    [document release];
}




- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    return self.dataSource.count;
}




- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"reuse" forIndexPath:indexPath];
    
    Student *data = self.dataSource[indexPath.row];
    cell.textLabel.text = data.name;

    return cell;
}

- (void)dealloc {
    self.dataSource = nil;
    [super dealloc];
}
@end

JSON解析

#import "JSONTableViewController.h"

#import "JSONKit.h"

@interface JSONTableViewController ()

@end

@implementation JSONTableViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    

    // Uncomment the following line to preserve selection between presentations.

    // self.clearsSelectionOnViewWillAppear = NO;

    

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.

    // self.navigationItem.rightBarButtonItem = self.editButtonItem;

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

#warning Potentially incomplete method implementation.

    // Return the number of sections.

    return 0;

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    // Return the number of rows in the section.

    return 0;

}

//左侧,系统,系统解析,效率最高

- (IBAction)btnxitong:(id)sender {

    //1.将JSON格式的数据,解析为OC对象

    //获取文件路径

    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Student.json" ofType:nil];

    //转化为 NSData 对象

    NSData *data = [NSData dataWithContentsOfFile:filePath];

    //解析

   NSMutableArray *dataArr = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];

    NSLog(@"%@",dataArr);

    

    //2.将oc对象转化为JSON格式的数据

    NSArray *arr1 = @[@"aa", @"bb", @"dd"];

    NSDictionary *dic = @{@"key":arr1};

   NSData *data2 = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:nil];

    

    

}

//右侧 第三方

- (IBAction)btndisanfang:(id)sender {

   //将JSON 数据 转化为OC对象

    

    

    //获取文件路径

    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Student.json" ofType:nil];

    //1.转化为 NSData 对象

    NSData *data = [NSData dataWithContentsOfFile:filePath];

    

   NSArray *dataArr = [data objectFromJSONData];

    

    NSLog(@"%@",dataArr);

    

    //2.转化为 NSString 对象

    NSString *str = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];

   NSArray *dataArr2 = [str objectFromJSONString];

    NSLog(@"%@=====", dataArr2);

    

    //2.将oc对象转化为JSON格式的数据

    NSArray *arr1 = @[@"aa", @"bb", @"dd"];

   NSData *jsonData1 = [arr1 JSONData];

    NSDictionary *dic = @{@"key":arr1};

   NSData *jsonData2 = [dic JSONData];

    

    

}

@end

Student.h


#import <Foundation/Foundation.h>

@interface Student : NSObject
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *gender;
@property (nonatomic, copy) NSString *age;
@property (nonatomic, copy) NSString *phone;
@property (nonatomic, copy) NSString *motto;

//节点的属性
@property (nonatomic, copy) NSString *position;
@end

Student.m

#import "Student.h"

@implementation Student
- (void)dealloc
{
    self.name = nil;
    self.gender = nil;
    self.age = nil;
    self.phone = nil;
    self.motto = nil;
    self.position = nil;
    [super dealloc];
}
@end

Student.xml

<?xml version = "1.0" encoding = "UTF-8"?>
<m:lanou32 xmlns:m = "www.lanou3g.com">
    <m:Student position = "iOS屌丝">
        <m:name>二豪</m:name>
        <m:gender>不详</m:gender>
        <m:age>17</m:age>
        <m:phone>38383434</m:phone>
        <m:motto>不成鸡便成鸭</m:motto>
    </m:Student>
    
    <m:Student position = "iOS调">
        <m:name>三涛</m:name>
        <m:gender>女</m:gender>
        <m:age>23</m:age>
        <m:phone>38383434</m:phone>
        <m:motto>不成鸡</m:motto>
    </m:Student>
    
    <m:Student position = "iOS思思">
        <m:name>大涛</m:name>
        <m:gender>女</m:gender>
        <m:age>24</m:age>
        <m:phone>38383434</m:phone>
        <m:motto>小鸡鸡</m:motto>
    </m:Student>
    
    <m:Student position = "iOS词穷">
        <m:name>四涛</m:name>
        <m:gender>女</m:gender>
        <m:age>24</m:age>
        <m:phone>38383434</m:phone>
        <m:motto>便成鸭</m:motto>
    </m:Student>
    
    <m:Student position = "iOS牛逼">
        <m:name>二涛</m:name>
        <m:gender>男</m:gender>
        <m:age>24</m:age>
        <m:phone>110</m:phone>
        <m:motto>座右铭</m:motto>
    </m:Student>
</m:lanou32>