iOS 网络编程：JSON解析 - iOS

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iOS 网络编程：JSON解析(二)

2017-10-13 10:33:13 【大中小】浏览:5193次

*jsonData = [[NSData alloc] initWithContentsOfFile:path];
8     id jsonObj = [NSJSONSerialization JSONObjectWithData:jsonData options: 0 error:nil];
9
10     NSInteger id = [jsonObj objectForKey: @" ResultCode "];
11     NSLog( @" %@ ",[jsonObj objectForKey: @" ResultCode "]);
12
13     NSData *data = [NSJSONSerialization dataWithJSONObject:jsonObj options:nil error:nil];
14     [data writeToFile: @" /Users/tengfei/Desktop/s.json " atomically: true];
15 }

2.2.2 以Stream为中介

与NSData转换中介不同，通过Stream转换它是通过两种不同的对象进行。当进行JSON文件解析时，是通过NSInputStream；而当进行编码时，是通过NSOutputStream进行。

如下表是两种Stream的创建方法：

类名	创建Stream方法
NSInputStream	+ (instancetype)inputStreamWithData:(NSData *)data
	+ (instancetype)inputStreamWithFileAtPath:(NSString *)path
	+ (instancetype)inputStreamWithURL:(NSURL *)url
	- (instancetype)initWithData:(NSData *)data
	- (instancetype)initWithFileAtPath:(NSString *)path
	- (instancetype)initWithURL:(NSURL *)url
NSOutputStream	+ (instancetype)outputStreamToMemory
	+ (instancetype)outputStreamToFileAtPath:(NSString *)path append:(BOOL)shouldAppend
	+ (instancetype)outputStreamWithURL:(NSURL *)url append:(BOOL)shouldAppend
	- (instancetype)initToMemory
	- (instancetype)initToFileAtPath:(NSString *)path append:(BOOL)shouldAppend
	- (instancetype)initWithURL:(NSURL *)url append:(BOOL)shouldAppend

如下是通过Stream进行JSON文件的编码和解码的简单示例：

1 -( void) testJsonWithStream
2 {
3     NSString *path = [[NSBundle mainBundle] pathForResource: @" Notes " ofType: @" json "]; // 获取文件的NSString路径
4
5     NSInputStream *inputStream = [[NSInputStream alloc] initWithFileAtPath:path]; // 创建Stream对象
6     [inputStream open]; // 打开Stream对象
7
8     id jsonObj = [NSJSONSerialization JSONObjectWithStream:inputStream options:NSJSONReadingMutableLeaves error:nil];
9
10     NSInteger id = [jsonObj objectForKey: @" ResultCode "];
11     NSLog( @" %@ ",[jsonObj objectForKey: @" ResultCode "]);
12
13      // 创建输出流
14     NSOutputStream *outpuStream =&nb

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