XML数据转JSON数据

1：JSON转XML---通常把JSON数据写到Plist文件即可；

2：XML数据转JSON--

　　使用开源类 XMLReader 先XML数据先转换为 NSDictionary 即可

3：开源类XMLReader

 1 //
 2 //  XMLReader.h
 3 //
 4 //
 5 /*
 6     本类使用方法：
 7         1：在使用的页面里面 导入本类 #import "XMLReader.h"
 8         2: 调用XMLReader 的两个类方法 就可以了，就可以返回字典数据；
 9         3：得到 NSDictionary数据，就是JSON 数据了；
10  
11  */
12 #import <Foundation/Foundation.h>
13 
14 
15 @interface XMLReader : NSObject <NSXMLParserDelegate>
16 {
17     NSMutableArray *dictionaryStack;
18     NSMutableString *textInProgress;
19     NSError **errorPointer;
20 }
21 
22 //XML Data数据转换为 字典的方法；
23 + (NSDictionary *)dictionaryForXMLData:(NSData *)data error:(NSError **)errorPointer;
24 + (NSDictionary *)dictionaryForXMLString:(NSString *)string error:(NSError **)errorPointer;
25 
26 @end

View Code

  1 //
  2 //  XMLReader.m
  3 //
  4 
  5 #import "XMLReader.h"
  6 
  7 NSString *const kXMLReaderTextNodeKey = @"text";
  8 
  9 @interface XMLReader (Internal)
 10 
 11 - (id)initWithError:(NSError **)error;
 12 - (NSDictionary *)objectWithData:(NSData *)data;
 13 
 14 @end
 15 
 16 
 17 @implementation XMLReader
 18 
 19 #pragma mark -
 20 #pragma mark -公有的方法
 21 
 22 //调用以下两个类方法即可；
 23 
 24 + (NSDictionary *)dictionaryForXMLData:(NSData *)data error:(NSError **)error
 25 {
 26     XMLReader *reader = [[XMLReader alloc] initWithError:error];
 27     NSDictionary *rootDictionary = [reader objectWithData:data];
 28     [reader release];
 29     return rootDictionary;
 30 }
 31 
 32 + (NSDictionary *)dictionaryForXMLString:(NSString *)string error:(NSError **)error
 33 {
 34     NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
 35     return [XMLReader dictionaryForXMLData:data error:error];
 36 }
 37 
 38 #pragma mark -
 39 #pragma mark 以下为 私有处理方法，可以不关注；
 40 
 41 - (id)initWithError:(NSError **)error
 42 {
 43     if (self = [super init])
 44     {
 45         errorPointer = error;
 46     }
 47     return self;
 48 }
 49 
 50 - (void)dealloc
 51 {
 52     [dictionaryStack release];
 53     [textInProgress release];
 54     [super dealloc];
 55 }
 56 
 57 - (NSDictionary *)objectWithData:(NSData *)data
 58 {
 59     // Clear out any old data
 60     [dictionaryStack release];
 61     [textInProgress release];
 62     
 63     dictionaryStack = [[NSMutableArray alloc] init];
 64     textInProgress = [[NSMutableString alloc] init];
 65     
 66     // Initialize the stack with a fresh dictionary
 67     [dictionaryStack addObject:[NSMutableDictionary dictionary]];
 68     
 69     // Parse the XML
 70     NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];
 71     parser.delegate = self;
 72     BOOL success = [parser parse];
 73     
 74     // Return the stack's root dictionary on success
 75     if (success)
 76     {
 77         NSDictionary *resultDict = [dictionaryStack objectAtIndex:0];
 78         return resultDict;
 79     }
 80     
 81     return nil;
 82 }
 83 
 84 #pragma mark -
 85 #pragma mark NSXMLParserDelegate methods
 86 
 87 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
 88 {
 89     // Get the dictionary for the current level in the stack
 90     NSMutableDictionary *parentDict = [dictionaryStack lastObject];
 91 
 92     // Create the child dictionary for the new element, and initilaize it with the attributes
 93     NSMutableDictionary *childDict = [NSMutableDictionary dictionary];
 94     [childDict addEntriesFromDictionary:attributeDict];
 95     
 96     // If there's already an item for this key, it means we need to create an array
 97     id existingValue = [parentDict objectForKey:elementName];
 98     if (existingValue)
 99     {
100         NSMutableArray *array = nil;
101         if ([existingValue isKindOfClass:[NSMutableArray class]])
102         {
103             // The array exists, so use it
104             array = (NSMutableArray *) existingValue;
105         }
106         else
107         {
108             // Create an array if it doesn't exist
109             array = [NSMutableArray array];
110             [array addObject:existingValue];
111 
112             // Replace the child dictionary with an array of children dictionaries
113             [parentDict setObject:array forKey:elementName];
114         }
115         
116         // Add the new child dictionary to the array
117         [array addObject:childDict];
118     }
119     else
120     {
121         // No existing value, so update the dictionary
122         [parentDict setObject:childDict forKey:elementName];
123     }
124     
125     // Update the stack
126     [dictionaryStack addObject:childDict];
127 }
128 
129 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
130 {
131     // Update the parent dict with text info
132     NSMutableDictionary *dictInProgress = [dictionaryStack lastObject];
133     
134     // Set the text property
135     if ([textInProgress length] > 0)
136     {
137         [dictInProgress setObject:textInProgress forKey:kXMLReaderTextNodeKey];
138 
139         // Reset the text
140         [textInProgress release];
141         textInProgress = [[NSMutableString alloc] init];
142     }
143     
144     // Pop the current dict
145     [dictionaryStack removeLastObject];
146 }
147 
148 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
149 {
150     // Build the text value
151     [textInProgress appendString:string];
152 }
153 
154 - (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError
155 {
156     // Set the error pointer to the parser's error object
157     *errorPointer = parseError;
158 }
159 
160 @end

View Code

4:GitHub下载：https://github.com/amarcadet/XMLReader/archive/master.zip