IOS 读取Json文件、读取plist文件

从工程项目中读取文件的操作

（1）从工程项目中读取Json文件

NSString* jsonStr = nil;

//第一种方法读取
NSString *mainBundleDirectory=[[NSBundle mainBundle] bundlePath];
NSString *path=[mainBundleDirectory stringByAppendingPathComponent:@"route_points_demo.json"];
NSURL *url=[NSURL fileURLWithPath:path];
NSData *data = [[NSData alloc] initWithContentsOfURL:url];
jsonStr=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

//第二种方法读取
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"route_points_demo" ofType:@"json"];
jsonStr  = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
NSData *jaonData   = [[NSData alloc] initWithData:[jsonStr dataUsingEncoding:NSUTF8StringEncoding]];
NSArray *allTrack = [NSJSONSerialization JSONObjectWithData:jaonData options:(NSJSONReadingMutableContainers) error:nil];

（2）从工程项目中读取plist文件

NSString *addressPath = [[NSBundle mainBundle] pathForResource:@"address" ofType:@"plist"];
NSMutableDictionary *dict = [[NSMutableDictionary alloc]initWithContentsOfFile:addressPath];
self.provinces = [dict objectForKey:@"address"];        //取出address数组

（3）从项目文件中读取文件到NSData、NSString、NSFileHandle、NSFileManager实例中

//第一种方法： NSFileManager实例方法读取数据
NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDesktopDirectory, NSUserDomainMask, YES);
NSString* thepath = [paths lastObject];
thepath = [thepath stringByAppendingPathComponent:@"fd_list.txt"];
NSLog(@"桌面目录：%@", thepath);
NSFileManager* fm = [NSFileManager defaultManager];
NSData* data = [[NSData alloc] init];
data = [fm contentsAtPath:thepath];
NSLog(@"%@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);

//第二种方法： NSData类方法读取数据
data = [NSData dataWithContentsOfFile:thepath];
NSLog(@"NSData类方法读取的内容是：%@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);

//第三种方法： NSString类方法读取内容
NSString* content = [NSString stringWithContentsOfFile:thepath encoding:NSUTF8StringEncoding error:nil];
NSLog(@"NSString类方法读取的内容是：\n%@",content);

//第四种方法： NSFileHandle实例方法读取内容
NSFileHandle* fh = [NSFileHandle fileHandleForReadingAtPath:thepath];
data = [fh readDataToEndOfFile];
NSLog(@"NSFileHandle实例读取的内容是：\n%@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);