iphone開發之Json數據的解析

網絡中數據的傳輸往往是以Json或XML格式進行的，如新浪微博、騰訊微博、人人網等。今天主要介紹一下ios下Json數據的解析。

首先是使用TouchJson進行解析：

TouchJson點擊下載

首先導入

將Source文件加下的所以文件導入工程，在合適的位置添加CJSONDeserializer.h頭文件。

代碼：

    NSString *jsonStr = <p class="p1">@"{\"customer\":[{\"name\":\"roamer\",\"ycount\":\"232.4\",\"sumcount\":\"322.3\"},{\"name\":\"<span class="s1">王三</span>\",\"ycount\":\"221.2\",\"sumcount\":\"1123.2\"},{\"name\":\"<span class="s1">李四</span>\",\"ycount\":\"1221.2\",\"sumcount\":\"12123.2\"}]}"<span class="s2">;</span></p>;  
        NSData *jsonData = [jsonStr dataUsingEncoding:NSUTF8StringEncoding];  
        NSError *error;  
        NSMutableDictionary *root = [[CJSONDeserializer deserializer] deserialize:jsonData error:&error];  
        NSLog(@"Customers:%@", root);  
        NSMutableArray *customers = [root objectForKey:@"customer"];  
        NSString *jsonTextStr = @"姓名:\n";  
        for (NSMutableDictionary *customer in customers) {  
            NSString *name = [customer objectForKey:@"name"];  
            name = [name stringByAppendingString:@"\n"];  
            jsonTextStr = [jsonTextStr stringByAppendingString:name];  
            NSLog(@"customer:%@",[customer objectForKey:@"name"]);  
        }  

輸出結果：

    Customers:{  
        customer =     (  
                    {  
                name = roamer;  
                sumcount = "322.3";  
                ycount = "232.4";  
            },  
                    {  
                name = "\U738b\U4e09";  
                sumcount = "1123.2";  
                ycount = "221.2";  
            },  
                    {  
                name = "\U674e\U56db";  
                sumcount = "12123.2";  
                ycount = "1221.2";  
            }  
        );  
    }  
    2012-06-15 14:08:20.406 TouchJsonTest[1495:f803] customer:roamer  
    2012-06-15 14:08:20.406 TouchJsonTest[1495:f803] customer:王三  
    2012-06-15 14:08:20.406 TouchJsonTest[1495:f803] customer:李四  

下面使用SBJson

SBJson下載
首先導入

將Classes文件加下的所以文件導入工程，在合適的位置添加SBJson.h頭文件。

代碼：

    //解析數據  
        SBJsonParser *parser = [[SBJsonParser alloc] init];  
        NSString *jsonStr = <p class="p1">@"{\"customer\":[{\"name\":\"roamer\",\"ycount\":\"232.4\",\"sumcount\":\"322.3\"},{\"name\":\"<span class="s1">王三</span>\",\"ycount\":\"221.2\",\"sumcount\":\"1123.2\"},{\"name\":\"<span class="s1">李四</span>\",\"ycount\":\"1221.2\",\"sumcount\":\"12123.2\"}]}"<span class="s2">;</span></p>  
        NSError *error = nil;  
        NSMutableDictionary *root = [[NSMutableDictionary alloc] initWithDictionary:[parser objectWithString:jsonStr error:&error]];  
        //轉換代碼 不然會帶來中文問題，諸如加()、：變成 = 等亂碼問題  
        SBJsonWriter *jsonWrite = [[SBJsonWriter alloc] init];  
        NSString *jsonString = [jsonWrite stringWithObject:root];  
        NSLog(@"JsonString:%@", jsonString);  
        [jsonWrite release];  
        NSMutableArray *customers = [root objectForKey:@"customer"];  
        NSLog(@"Customers:%@", customers);  

        for (NSMutableDictionary *customer in customers) {  
            NSLog(@"Customer-name:%@", [customer objectForKey:@"name"]);  
        }  
        [self.jsonData setText:@"解析完成"];  
        [self.parseBtn setTitle:@"Done" forState:UIControlStateNormal];  

使用TouchJson和SBJson都可以快速的完成Json數據的解析，兩者使用起來都比較簡單，但TouchJson性能更好一些推薦使用。
轉自：http://blog.csdn.net/shang_515/article/details/7666261