IOS-网络（JSON解析数据与XML解析数据）

一、JSON解析数据

 //
 //  VideoModel.h
 //  IOS_0130_网络视频
 //
 //  Created by ma c on 16/1/30.
 //  Copyright © 2016年 博文科技. All rights reserved.
 //

 #import <Foundation/Foundation.h>

 @interface VideoModel : NSObject

 @property (nonatomic, assign) int id;
 @property (nonatomic, assign) int length;
 @property (nonatomic, copy) NSString *image;
 @property (nonatomic, copy) NSString *name;
 @property (nonatomic, copy) NSString *url;

 + (instancetype)videoWithDict:(NSDictionary *)dict;

 @end

 //
 //  VideoModel.m
 //  IOS_0130_网络视频
 //
 //  Created by ma c on 16/1/30.
 //  Copyright © 2016年 博文科技. All rights reserved.
 //

 #import "VideoModel.h"

 @implementation VideoModel

 + (instancetype)videoWithDict:(NSDictionary *)dict
 {
     VideoModel *model = [[VideoModel alloc] init];
     [model setValuesForKeysWithDictionary:dict];
     return model;
 }

 @end

 //
 //  VideosTableViewController.m
 //  IOS_0130_网络视频
 //
 //  Created by ma c on 16/1/30.
 //  Copyright © 2016年 博文科技. All rights reserved.
 //

 #import "VideosTableViewController.h"
 #import "MBProgressHUD+MJ.h"
 #import "UIImageView+WebCache.h"
 #import "VideoModel.h"
 #import <MediaPlayer/MediaPlayer.h>

 #define url(path) [NSURL URLWithString:[NSString stringWithFormat:@"http://localhost:8080/MJServer/%@",path]]

 @interface VideosTableViewController ()

 @property (nonatomic, strong) NSMutableArray *arrModel;

 @end

 @implementation VideosTableViewController

 - (void)viewDidLoad {
     [super viewDidLoad];
     //加载视频信息
     [self loadVideo];
 }
 - (NSMutableArray *)arrModel
 {
     if (!_arrModel) {
         _arrModel = [[NSMutableArray alloc] init];
     }
     return _arrModel;
 }

 - (void)loadVideo
 {
     //1.创建NSURL
     NSURL *url = url(@"video");
     //2.创建请求
     NSURLRequest *request = [NSURLRequest requestWithURL:url];
     //3.发送请求
     [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
         if (connectionError || data == nil) {
             [MBProgressHUD showError:@"网络繁忙，请稍后再试"];
             return;
         }
         //解析JSON数据
         NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
         NSArray *arr = dict[@"videos"];

         for (NSDictionary *dict in arr) {
             VideoModel *model = [VideoModel videoWithDict:dict];

             [self.arrModel addObject:model];
         }
         [self.tableView reloadData];

     }];
 }

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

 #pragma mark - Table view data source

 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
     return self.arrModel.count;
 }

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
     NSString *ID = @"video";
     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];

     if (!cell) {
         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ID];
     }

     VideoModel *model = self.arrModel[indexPath.row];

     cell.textLabel.text = model.name;

     NSString *time = [NSString stringWithFormat:@"时长:%d分钟",model.length];
     cell.detailTextLabel.text = time;

     //显示视频截图

     NSURL *url = url(model.image);
     [cell.imageView sd_setImageWithURL:url placeholderImage:[UIImage imageNamed:@"1.jpg"]];

     return cell;
 }

 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
 {
     VideoModel *model = self.arrModel [indexPath.row];

     //创建系统自带的视频播放器
     NSURL *url = url(model.url);
     MPMoviePlayerViewController *playerVC = [[MPMoviePlayerViewController alloc] initWithContentURL:url];
     //显示视频播放器
     [self presentViewController:playerVC animated:nil completion:nil];
 }

 @end

二、XML解析数据

 //
 //  VideoModel.h
 //  IOS_0130_网络视频
 //
 //  Created by ma c on 16/1/30.
 //  Copyright © 2016年 博文科技. All rights reserved.
 //

 #import <Foundation/Foundation.h>

 @interface VideoModel : NSObject

 @property (nonatomic, assign) int id;
 @property (nonatomic, assign) int length;
 @property (nonatomic, copy) NSString *image;
 @property (nonatomic, copy) NSString *name;
 @property (nonatomic, copy) NSString *url;

 + (instancetype)videoWithDict:(NSDictionary *)dict;

 @end

 //
 //  VideoModel.m
 //  IOS_0130_网络视频
 //
 //  Created by ma c on 16/1/30.
 //  Copyright © 2016年 博文科技. All rights reserved.
 //

 #import "VideoModel.h"

 @implementation VideoModel

 + (instancetype)videoWithDict:(NSDictionary *)dict
 {
     VideoModel *model = [[VideoModel alloc] init];
     [model setValuesForKeysWithDictionary:dict];
     return model;
 }

 @end

 //
 //  VideosTableViewController.m
 //  IOS_0130_网络视频
 //
 //  Created by ma c on 16/1/30.
 //  Copyright © 2016年 博文科技. All rights reserved.
 //

 #import "VideosTableViewController.h"
 #import "MBProgressHUD+MJ.h"
 #import "UIImageView+WebCache.h"
 #import "VideoModel.h"
 #import <MediaPlayer/MediaPlayer.h>
 #import "GDataXMLNode.h"

 #define url(path) [NSURL URLWithString:[NSString stringWithFormat:@"http://localhost:8080/MJServer/%@",path]]

 @interface VideosTableViewController ()<NSXMLParserDelegate>

 @property (nonatomic, strong) NSMutableArray *arrModel;

 @end

 @implementation VideosTableViewController

 /*
  IOS中的XML解析方法
  1>苹果原生
    NSXMLParser：SAX方式解析，使用简单
  2>第三方框架
    libxml2：纯C语言，默认包含在IOS SDK中，同时支持DOM和SAX方式解析
    GDataXML：DOM解析，由Google开发，基于libxml2
  3>建议
    大文件：NSXMLParser、libxml2
    小文件：GDataXML
  4>XML解析方式
    SAX：一次性将整个XML文档加载进内存，适合解析小文件
    DOM：（事件驱动）- 从根元素开始，按顺序一个元素一个元素往下解析，比较适合解析大文件
  5>GDataXML常用的类
    GDataXMLDocument：代表整个XML文档
    GDataXMLElement：代表XML元素

  */

 - (void)viewDidLoad {
     [super viewDidLoad];
     //加载视频信息
     [self loadVideo];
 }
 - (NSMutableArray *)arrModel
 {
     if (!_arrModel) {
         _arrModel = [[NSMutableArray alloc] init];
     }
     return _arrModel;
 }

 - (void)loadVideo
 {
     //1.创建NSURL
     NSURL *url = url(@"video?type=XML");
     //2.创建请求
     NSURLRequest *request = [NSURLRequest requestWithURL:url];
     //3.发送请求
     [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {

         if (connectionError || data == nil) {
             [MBProgressHUD showError:@"网络繁忙，请稍后再试"];
             return;
         }
         //使用GDataXML - 解析XML数据
         //[self useGDataXMLWithData:data];

         //使用NSXMLParser解析XML数据
         [self useNSXMLParserWithData:data];
     }];
 }
 #pragma mark - NSXMLParser解析XML
 - (void)useNSXMLParserWithData:(NSData *)data
 {
     //1.创建XML解析器 - SAX - 逐个往下解析
     NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];
     //2.设置代理
     parser.delegate = self;
     //3.开始解析
     [parser parse];
     //4.刷新表格
     [self.tableView reloadData];
 }

 #pragma mark - NSXMLParser的代理方法
 //解析到文档开头是时调用
 - (void)parserDidStartDocument:(NSXMLParser *)parser
 {
     //NSLog(@"parserDidStartDocument");
 }
 //解析到一个元素的开始就会调用
 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary<NSString *,NSString *> *)attributeDict
 {
     //NSLog(@"didStartElement------%@",elementName);

     NSLog(@"attributeDict:%@",attributeDict);

     if ([elementName isEqualToString:@"videos"])  return;

     VideoModel *model = [VideoModel videoWithDict:attributeDict];
     [self.arrModel addObject:model];

 }
 //解析到一个元素的结束就会调用
 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
 {
     //NSLog(@"didEndElement------%@",elementName);
 }
 //解析到文档结尾时调用
 - (void)parserDidEndDocument:(NSXMLParser *)parser
 {
     //NSLog(@"parserDidEndDocument");
 }

 #pragma mark - GDataXML方法
 - (void)useGDataXMLWithData:(NSData *)data
 {
     //解析XML数据
     //加载XML文件
     GDataXMLDocument *doc = [[GDataXMLDocument alloc] initWithData:data error:nil];

     //获取文档的根元素 -- videos元素
     GDataXMLElement *root = doc.rootElement;

     //获取根元素里面所有video元素
     NSArray *elements = [root elementsForName:@"video"];

     //遍历所有的video元素
     for (GDataXMLElement *videoElement in elements) {
         VideoModel *model = [[VideoModel alloc] init];

         //取出元素属性
         model.id = [videoElement attributeForName:@"id"].stringValue.intValue;
         model.length = [videoElement attributeForName:@"length"].stringValue.intValue;
         model.name = [videoElement attributeForName:@"name"].stringValue;
         model.image = [videoElement attributeForName:@"image"].stringValue;
         model.url = [videoElement attributeForName:@"url"].stringValue;

         //添加到数组中
         [self.arrModel addObject:model];
     }
     //刷新表格
     [self.tableView reloadData];
 }

 #pragma mark - Table view data source

 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
     return self.arrModel.count;
 }

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
     NSString *ID = @"video";
     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];

     if (!cell) {
         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ID];
     }

     VideoModel *model = self.arrModel[indexPath.row];

     cell.textLabel.text = model.name;

     NSString *time = [NSString stringWithFormat:@"时长:%d分钟",model.length];
     cell.detailTextLabel.text = time;

     //显示视频截图

     NSURL *url = url(model.image);
     [cell.imageView sd_setImageWithURL:url placeholderImage:[UIImage imageNamed:@"1.jpg"]];

     return cell;
 }

 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
 {
     VideoModel *model = self.arrModel [indexPath.row];

     //创建系统自带的视频播放器
     NSURL *url = url(model.url);
     MPMoviePlayerViewController *playerVC = [[MPMoviePlayerViewController alloc] initWithContentURL:url];
     //显示视频播放器
     [self presentViewController:playerVC animated:nil completion:nil];
 }

 @end