/
index.html
435 lines (298 loc) · 16 KB
/
index.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
<!DOCTYPE HTML>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title>不要使用SBJSON(json-framework) | 唐巧的博客</title>
<meta name="viewport" content="width=device-width, initial-scale=1,user-scalable=no">
<meta name="author" content="唐巧">
<meta name="description" content="不知道为什么，在iOS开发中，有很多人使用 SBJSON （又被称作json-framework)来做JSON解析库。我想这是因为SBJSON是最早在iOS上出现的JSON解析库。但是随着iOS开发的流行，越来越多优秀的JSON解析库也涌现出来, SBJSON和它们相比，性能上有很大的差距。">
<meta property="og:type" content="article">
<meta property="og:title" content="不要使用SBJSON(json-framework)">
<meta property="og:url" content="https://blog.devtang.com/2012/05/05/do-not-use-sbjson/index.html">
<meta property="og:site_name" content="唐巧的博客">
<meta property="og:description" content="不知道为什么，在iOS开发中，有很多人使用 SBJSON （又被称作json-framework)来做JSON解析库。我想这是因为SBJSON是最早在iOS上出现的JSON解析库。但是随着iOS开发的流行，越来越多优秀的JSON解析库也涌现出来, SBJSON和它们相比，性能上有很大的差距。">
<meta property="og:locale" content="zh_CN">
<meta property="og:image" content="https://blog.devtang.com/images/json_benchmark.gif">
<meta property="article:published_time" content="2012-05-05T01:35:00.000Z">
<meta property="article:modified_time" content="2020-02-08T18:08:22.157Z">
<meta property="article:author" content="唐巧">
<meta property="article:tag" content="iOS">
<meta property="article:tag" content="唐巧">
<meta property="article:tag" content="猿辅导">
<meta property="article:tag" content="开发">
<meta name="twitter:card" content="summary">
<meta name="twitter:image" content="https://blog.devtang.com/images/json_benchmark.gif">
<link rel="alternative" href="/atom.xml" title="唐巧的博客" type="application/atom+xml">
<link rel="icon" href="/img/favicon.png">
<link rel="stylesheet" href="/css/style.css">
<link rel="stylesheet" href="/%02.css">
<link rel="stylesheet" href="/.css">
<meta name="generator" content="Hexo 4.2.0"></head>
<body>
<header>
<div>
<div id="textlogo">
<h1 class="site-name"><a href="/" title="唐巧的博客">唐巧的博客</a></h1>
<h2 class="blog-motto">记录下自己学习的点滴</h2>
</div>
<div class="navbar"><a class="navbutton navmobile" href="#" title="菜单">
</a></div>
<nav class="animated">
<ul>
<ul>
<li><a href="/">首页</a></li>
<li><a href="/archives">归档</a></li>
<li><a href="/about">关于</a></li>
<li>
<form class="search" action="//google.com/search" method="get" accept-charset="utf-8">
<label>Search</label>
<input type="search" id="search" name="q" autocomplete="off" maxlength="20" placeholder="搜索" />
<input type="hidden" name="q" value="site:blog.devtang.com">
</form>
</li>
</ul>
</nav>
</div>
</header>
<div id="container">
<div id="main" class="post" itemscope itemprop="blogPost">
<article itemprop="articleBody">
<header class="article-info clearfix">
<h1 itemprop="name">
<a href="/2012/05/05/do-not-use-sbjson/" title="不要使用SBJSON(json-framework)" itemprop="url">不要使用SBJSON(json-framework)</a>
</h1>
<p class="article-time">
<time datetime="2012-05-05T01:35:00.000Z" itemprop="datePublished"> 发表于 2012-05-05 01:35</time>
</p>
</header>
<div class="article-content">
<div id="toc" class="toc-article">
<strong class="toc-title">文章目录</strong>
</div>
<p>不知道为什么，在iOS开发中，有很多人使用 <a href="https://github.com/stig/json-framework" target="_blank" rel="noopener">SBJSON</a> （又被称作json-framework)来做JSON解析库。我想这是因为SBJSON是最早在iOS上出现的JSON解析库。但是随着iOS开发的流行，越来越多优秀的JSON解析库也涌现出来, SBJSON和它们相比，性能上有很大的差距。</p>
<a id="more"></a>
<p>现在iOS行业内主要流行的JSON解析库有：<br><a href="http://developer.apple.com/library/ios/#documentation/Foundation/Reference/NSJSONSerialization_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40010946" target="_blank" rel="noopener">NSJSONSerialization</a>、<br><a href="http://samsoff.es/posts/parsing-json-with-the-iphones-private-json-framework" target="_blank" rel="noopener">Apple JSON</a>、<br><a href="http://github.com/schwa/TouchJSON" target="_blank" rel="noopener">TouchJSON</a>、<br><a href="http://github.com/stig/json-framework" target="_blank" rel="noopener">SBJSON</a>、<br><a href="http://github.com/gabriel/yajl-objc" target="_blank" rel="noopener">YAJL</a>、<br><a href="http://github.com/johnezang/JSONKit" target="_blank" rel="noopener">JSONKit</a></p>
<p>行业内许多同行都对这些库进行过benchmark测试。我在网上搜到的测试文章包括：</p>
<ul>
<li><a href="https://github.com/samsoffes/json-benchmarks" target="_blank" rel="noopener">https://github.com/samsoffes/json-benchmarks</a></li>
<li><a href="http://blog.csdn.net/arthurchenjs/article/details/7009995" target="_blank" rel="noopener">http://blog.csdn.net/arthurchenjs/article/details/7009995</a></li>
<li><a href="http://blog.csdn.net/ccat/article/details/7207871" target="_blank" rel="noopener">http://blog.csdn.net/ccat/article/details/7207871</a></li>
<li><a href="http://omegadelta.net/2011/11/04/json-framework-now-sbjson-is-evil/" target="_blank" rel="noopener">http://omegadelta.net/2011/11/04/json-framework-now-sbjson-is-evil/</a></li>
<li><a href="http://stackoverflow.com/questions/2256625/comparison-of-json-parser-for-objective-c-json-framework-yajl-touchjson-etc" target="_blank" rel="noopener">http://stackoverflow.com/questions/2256625/comparison-of-json-parser-for-objective-c-json-framework-yajl-touchjson-etc</a></li>
</ul>
<p>下图是我从<a href="http://my.csdn.net/ArthurChenJS" target="_blank" rel="noopener">ArthurChenJS</a>的<a href="http://blog.csdn.net/arthurchenjs/article/details/7009995" target="_blank" rel="noopener">博客文章</a>中截取的一张benchmark测试结果图(横条越短，解析速度越快)：</p>
<img src="/images/json_benchmark.gif" class="">
<p>从这些文章中可以看到，SBJSON在多数测试中都处于倒数的第一或倒数第二的位置。所以说，SBJSON实际上在性能这一点上讲，确实是非常“SB”的，实在不值得大家留念。赶快把你的JSON解析库换成其它的吧！</p>
<p>那么应该换成哪个呢？<br>如果你的app只支持iOS 5.0以上系统，那么直接用苹果官方提供的JSON库：<a href="http://developer.apple.com/library/ios/#documentation/Foundation/Reference/NSJSONSerialization_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40010946" target="_blank" rel="noopener">NSJSONSerialization</a><br>库即可。<br>如果你的app要支持iOS 5.0以下的系统，那么我个人推荐JSONKit，不过JSONKit本身做了很多内存上的优化，所以不支持ARC，你在使用时可以对其加上 -fno-objc-arc 的编译标志即可，设置这个编译标志的详细步骤可以见<a href="http://stackoverflow.com/questions/6308425/ios-5-best-practice-release-retain" target="_blank" rel="noopener">这篇文章</a>。</p>
<p>JSONKit的使用也非常方便，在使用上只需要把SBJSON的JSONValue方法换成objectFromJSONData，JSONRepresentation方法换成JSONString即可。附上一段使用示例：</p>
<figure class="highlight objc"><table><tr><td class="code"><pre><span class="line"><span class="meta">#import <span class="meta-string">"JSONKit.h"</span></span></span><br><span class="line"></span><br><span class="line"><span class="built_in">NSString</span> *path = [[<span class="built_in">NSBundle</span> mainBundle] pathForResource:<span class="string">@"data"</span> ofType:<span class="string">@"json"</span>];</span><br><span class="line"><span class="built_in">NSData</span> *content = [<span class="built_in">NSData</span> dataWithContentsOfFile:path];</span><br><span class="line"><span class="built_in">NSDictionary</span> *kitData = [content objectFromJSONData];</span><br><span class="line"><span class="built_in">NSString</span> *kitString = [kitData JSONString];</span><br></pre></td></tr></table></figure>
<p>祝大家玩得开心。</p>
</div>
<footer class="article-footer clearfix">
<div class="article-catetags">
<div class="article-categories">
<span></span>
<a class="article-category-link" href="/categories/iOS/">iOS</a>
</div>
</div>
<div class="article-share" id="share">
<div data-url="https://blog.devtang.com/2012/05/05/do-not-use-sbjson/" data-title="不要使用SBJSON(json-framework) | 唐巧的博客" data-tsina="" class="share clearfix">
</div>
</div>
</footer>
</article>
<nav class="article-nav clearfix">
<div class="prev" >
<a href="/2012/06/24/enhance-uiactionsheet/" title="封装同步的UIActionSheet">
<strong>上一篇：</strong><br/>
<span>
封装同步的UIActionSheet</span>
</a>
</div>
<div class="next">
<a href="/2012/04/22/use-fmdb/" title="在iOS开发中使用FMDB">
<strong>下一篇：</strong><br/>
<span>在iOS开发中使用FMDB
</span>
</a>
</div>
</nav>
</div>
<div class="openaside"><a class="navbutton" href="#" title="显示侧边栏"></a></div>
<div id="asidepart">
<div class="closeaside"><a class="closebutton" href="#" title="隐藏侧边栏"></a></div>
<aside class="clearfix">
<div class="sponsor">
</div>
<div class="categorieslist">
<p class="asidetitle">分类</p>
<ul>
<li><a href="/categories/books-summary/" title="books summary">books summary</a></li>
<li><a href="/categories/iOS/" title="iOS">iOS</a></li>
<li><a href="/categories/iOS-weekly/" title="iOS weekly">iOS weekly</a></li>
<li><a href="/categories/mac/" title="mac">mac</a></li>
<li><a href="/categories/shell/" title="shell">shell</a></li>
<li><a href="/categories/summary/" title="summary">summary</a></li>
</ul>
</div>
<div class="weixin">
<br />
<p class="asidetitle">微信公众号</p>
<p>关注我的微信公众号，和我一起成长：</p>
<img src="/images/weixin-qr.jpg" width="230px" />
</div>
<div class="rsspart">
<a href="/atom.xml" target="_blank" title="rss">RSS 订阅</a>
</div>
</aside>
</div>
</div>
<footer><div id="footer" >
<div class="social-font" class="clearfix">
</div>
<p class="copyright" style="margin-top: 10px;">
Powered by <a href="http://hexo.io" target="_blank" title="hexo">hexo</a> and Theme by <a href="https://github.com/wuchong/jacman" target="_blank" title="Jacman">Jacman</a> © 2020
<a href="/about" target="_blank" title="唐巧">唐巧</a>
</p>
</div>
</footer>
<script src="/js/jquery-2.0.3.min.js"></script>
<script src="/js/jquery.imagesloaded.min.js"></script>
<script src="/js/gallery.js"></script>
<script src="/js/jquery.qrcode-0.12.0.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('.navbar').click(function(){
$('header nav').toggleClass('shownav');
});
var myWidth = 0;
function getSize(){
if( typeof( window.innerWidth ) == 'number' ) {
myWidth = window.innerWidth;
} else if( document.documentElement && document.documentElement.clientWidth) {
myWidth = document.documentElement.clientWidth;
};
};
var m = $('#main'),
a = $('#asidepart'),
c = $('.closeaside'),
o = $('.openaside');
c.click(function(){
a.addClass('fadeOut').css('display', 'none');
o.css('display', 'block').addClass('fadeIn');
m.addClass('moveMain');
});
o.click(function(){
o.css('display', 'none').removeClass('beforeFadeIn');
a.css('display', 'block').removeClass('fadeOut').addClass('fadeIn');
m.removeClass('moveMain');
});
$(window).scroll(function(){
o.css("top",Math.max(80,260-$(this).scrollTop()));
});
$(window).resize(function(){
getSize();
if (myWidth >= 1024) {
$('header nav').removeClass('shownav');
}else{
m.removeClass('moveMain');
a.css('display', 'block').removeClass('fadeOut');
o.css('display', 'none');
}
});
});
</script>
<script type="text/javascript">
$(document).ready(function(){
var ai = $('.article-content>iframe'),
ae = $('.article-content>embed'),
t = $('#toc'),
ta = $('#toc.toc-aside'),
o = $('.openaside'),
c = $('.closeaside');
if(ai.length>0){
ai.wrap('<div class="video-container" />');
};
if(ae.length>0){
ae.wrap('<div class="video-container" />');
};
c.click(function(){
ta.css('display', 'block').addClass('fadeIn');
});
o.click(function(){
ta.css('display', 'none');
});
$(window).scroll(function(){
ta.css("top",Math.max(140,320-$(this).scrollTop()));
});
});
</script>
<script type="text/javascript">
$(document).ready(function(){
var $this = $('.share'),
url = $this.attr('data-url'),
encodedUrl = encodeURIComponent(url),
title = $this.attr('data-title'),
tsina = $this.attr('data-tsina'),
description = $this.attr('description');
var html = [
'<div class="hoverqrcode clearfix"></div>',
'<a class="overlay" id="qrcode"></a>',
'<a href="https://www.facebook.com/sharer.php?u=' + encodedUrl + '" class="article-share-facebook" target="_blank" title="Facebook"></a>',
'<a href="https://twitter.com/intent/tweet?url=' + encodedUrl + '" class="article-share-twitter" target="_blank" title="Twitter"></a>',
'<a href="#qrcode" class="article-share-qrcode" title="微信"></a>',
'<a href="http://widget.renren.com/dialog/share?resourceUrl=' + encodedUrl + '&srcUrl=' + encodedUrl + '&title=' + title +'" class="article-share-renren" target="_blank" title="人人"></a>',
'<a href="http://service.weibo.com/share/share.php?title='+title+'&url='+encodedUrl +'&ralateUid='+ tsina +'&searchPic=true&style=number' +'" class="article-share-weibo" target="_blank" title="微博"></a>',
'<span title="Share to"></span>'
].join('');
$this.append(html);
$('.hoverqrcode').hide();
var myWidth = 0;
function updatehoverqrcode(){
if( typeof( window.innerWidth ) == 'number' ) {
myWidth = window.innerWidth;
} else if( document.documentElement && document.documentElement.clientWidth) {
myWidth = document.documentElement.clientWidth;
};
var qrsize = myWidth > 1024 ? 200:100;
var options = {render: 'image', size: qrsize, fill: '#2ca6cb', text: url, radius: 0.5, quiet: 1};
var p = $('.article-share-qrcode').position();
$('.hoverqrcode').empty().css('width', qrsize).css('height', qrsize)
.css('left', p.left-qrsize/2+20).css('top', p.top-qrsize-10)
.qrcode(options);
};
$(window).resize(function(){
$('.hoverqrcode').hide();
});
$('.article-share-qrcode').click(function(){
updatehoverqrcode();
$('.hoverqrcode').toggle();
});
$('.article-share-qrcode').hover(function(){}, function(){
$('.hoverqrcode').hide();
});
});
</script>
<!-- Analytics Begin -->
<script type="text/javascript">
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-28029597-1', '');
ga('send', 'pageview');
</script>
<!-- Analytics End -->
<!-- Totop Begin -->
<div id="totop">
<a title="返回顶部"><img src="/img/scrollup.png"/></a>
</div>
<script src="/js/totop.js"></script>
<!-- Totop End -->
<!-- MathJax Begin -->
<!-- mathjax config similar to math.stackexchange -->
<!-- MathJax End -->
<!-- Tiny_search Begin -->
<!-- Tiny_search End -->
</body>
</html>