如何从 iOS 应用程序调用在 Python 的 ladon 框架中开发的 Web 服务？
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【中文标题】如何从 iOS 应用程序调用在 Python 的 ladon 框架中开发的 Web 服务？【英文标题】：How to call web service which is developed in Python's ladon framework from iOS app? 【发布时间】：2013-08-31 09:38:16 【问题描述】：网络服务建立在 Python 的 Ladon 框架之上。
Web 服务 URL 为：http://ladonize.org/python-demos/Calculator
调用web服务的代码如下：
NSString *requestString = [NSString stringWithFormat:
@"http://ladonize.org/python-demos/Calculator"];
NSString *jsonString = [NSString stringWithFormat:@"\"methodname\":\"add\",\"args\": \"a\":\"123\",\"b\":\"123\""];
NSData *jsonData = [NSData dataWithBytes: [jsonString UTF8String] length: [jsonString length]];
NSURL *url = [NSURL URLWithString:requestString];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:@"POST"];
[request setHTTPBody: jsonData];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
[request setValue:[NSString stringWithFormat:@"%d", [jsonData length]] forHTTPHeaderField:@"Content-Length"];
NSError *errorReturned = nil;
NSURLResponse *theResponse =[[NSURLResponse alloc]init];
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&theResponse error:&errorReturned];
if (errorReturned)
NSLog(@"Error %@",errorReturned.description);
else
NSError *jsonParsingError = nil;
NSMutableArray *arrDoctorInfo = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers|NSJSONReadingAllowFragments error:&jsonParsingError];
NSString* newStr = [NSString stringWithUTF8String:[data bytes]];
NSLog(@"Dict %@",newStr);
我得到以下回应
<html>
<head>
<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
<title>Calculator</title>
<style>
body margin: 0px; padding: 0px; font-family: verdana; font-size: 12pt; background-color: #FCFCFC;
div.service-header
height: 34px;
font-weight: bold; padding: 10px; font-size: 30px; color: white; border-bottom: 1px solid black; background: #70803C;
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#A0B06C', endColorstr='#70803C'); background: -webkit-gradient(linear, left top, left bottom, from(#A0B06C), to(#70803C)); background: -moz-linear-gradient(top, #A0B06C, #70803C);
text-shadow: #555555 2px 3px 3px;
div.service-header div.service-title position: relative; float:left
div.service-header .skin-selector padding-top: 8px; margin-bottom: 0; position:relative; float: right; font-size: 12pt;
div.service-overview
float: right; margin: 20px; width: 200px;
-moz-border-radius: 7px 7px 7px 7px; -webkit-border-radius: 7px 7px 7px 7px; border-radius: 7px 7px 7px 7px; background-color: #F6F6F6; border: 1px solid #E6E6E6; border-collapse: separate; font-size: 11px; padding: 10px; margin-right: 20px;
-moz-box-shadow: 2px 2px 4px #555; -webkit-box-shadow: 2px 2px 4px #555; box-shadow: 2px 2px 4px #555;
div.service-overview div.headline font-weight: bold; font-size: 18px;
div.service-overview div.title font-weight: bold; margin: 4px; font-size: 1.2em;
div.service-overview ul.list padding: 0px; margin: 0px; margin-left: 15px; list-style-type: none;
div.service-overview ul.list li font-size: 1.1em;
div.service-description padding: 15px; padding-bottom: 0px;
div.service-description div.title font-weight: bold; font-size: 1.2em;
div.service-description p.doc-lines font-size: 0.8em;
div.service-description p.url font-size: 0.8em; font-style: italic;
div.service-description p.url span.url-title font-weight: bold;
div.service-interfaces padding: 15px; padding-bottom: 0px;
div.service-interfaces div.title font-weight: bold; font-size: 1.2em;
div.service-interfaces ul.list font-size: 0.8em;
div.service-interfaces ul.list li padding: 4px;
div.service-api padding: 15px; padding-bottom: 0px;
div.service-api div.methods div.title font-weight: bold; font-size: 1.2em;
div.service-api div.methods ul.list font-size: 0.9em; list-style-type: none;
div.service-api div.methods ul.list li.entry
-moz-border-radius: 7px 7px 7px 7px; -webkit-border-radius: 7px 7px 7px 7px; border-radius: 7px 7px 7px 7px; background-color: #F6F6F6; border: 1px solid #E6E6E6;
border-collapse: separate; font-size: 0.8em; padding: 10px; margin-right: 20px;
-moz-box-shadow: 2px 2px 5px #555; -webkit-box-shadow: 2px 2px 5px #555; box-shadow: 2px 2px 5px #555;
margin-bottom: 16px;
div.service-api div.methods ul.list li.entry div.declaration
font-size: 1.5em;
div.service-api div.methods ul.list li.entry div.declaration span.name color: #881a1a;
div.service-api div.methods ul.list li.entry span.param-type color: #68387f;
div.service-api div.methods ul.list li.entry span.param-name
div.service-api div.methods ul.list li.entry p.doc-lines font-size: 1.2em; color: #276d11;
div.service-api div.methods ul.list li.entry ul.params p.doc-lines margin-top:0;margin-bottom:6px; font-size: 1.0em; color: #276d11;
div.service-api div.types div.title font-weight: bold; font-size: 1.2em;
div.service-api div.types ul.list font-size: 0.9em; list-style-type: none;
div.service-api div.types ul.list li.entry
-moz-border-radius: 7px 7px 7px 7px; -webkit-border-radius: 7px 7px 7px 7px; border-radius: 7px 7px 7px 7px; background-color: #F6F6F6; border: 1px solid #E6E6E6;
border-collapse: separate; font-size: 0.8em; padding: 10px; margin-right: 20px;
-moz-box-shadow: 2px 2px 5px #555; -webkit-box-shadow: 2px 2px 5px #555; box-shadow: 2px 2px 5px #555;
margin-bottom: 16px;
div.service-api div.types ul.list li.entry div.definition
font-size: 1.5em;
div.service-api div.types ul.list li.entry div.definition span.name color: #881a1a;
div.service-api div.types ul.list li.entry span.param-type color: #68387f;
div.service-api div.types ul.list li.entry span.param-name
div.service-api div.types ul.list li.entry p.doc-lines margin-top:0;margin-bottom:6px; font-size: 1.0em; color: #276d11;
div.service-footer font-size: 0.8em; text-align: center; font-style: italic; padding-top: 10px; padding-bottom: 10px;
a:link color: #00732F; text-decoration: none
a:visited color: #00732F; text-decoration: none
a:hover color: #00732F; text-decoration: underline
</style>
</head>
<body>
<div class="service-header">
<div class="service-title">Calculator</div>
<form method="get" class="skin-selector">
<label for="skin-select">skins:</label>
<select id="skin-select" name="skin" onchange="document.forms[0].submit()">
<option value="">Default</option>
<option value="simple">Simple</option>
<option value="bluebox">Bluebox</option>
</select>
</form>
</div>
<div class="service-overview">
<div class="headline">Overview</div>
<div class="title">Methods</div>
<ul class="list">
<li>
<a href="#add"><span class="entry">add</span></a>
( )
</li>
</ul>
<div class="title">Types</div>
<ul class="list">
</ul>
</div>
<div class="service-description">
<div class="title">Description</div>
<p class="doc-lines">
This service does the math, and serves as example for new potential Ladon users.
</p>
</div>
<div class="service-interfaces">
<div class="title">Interfaces</div>
<ul class="list">
<li>soap11 [ <a href="http://ladonize.org/python-demos/Calculator/soap11">url</a> <a href="http://ladonize.org/python-demos/Calculator/soap11/description">description</a> ]</li>
<li>jsonwsp [ <a href="http://ladonize.org/python-demos/Calculator/jsonwsp">url</a> <a href="http://ladonize.org/python-demos/Calculator/jsonwsp/description">description</a> ]</li>
<li>soap [ <a href="http://ladonize.org/python-demos/Calculator/soap">url</a> <a href="http://ladonize.org/python-demos/Calculator/soap/description">description</a> ]</li>
</ul>
</div>
<div class="service-api">
<div class="methods">
<div class="title">Methods</div>
<ul class="list">
<li class="entry">
<div class="declaration">
<a name="add"></a><span class="name">add</span>
(
<span class="param-type">
number
</span>
<span class="param-name">a</span>
,
<span class="param-type">
number
</span>
<span class="param-name">b</span>
)
</div>
<p class="doc-lines">
Add two integers together and return the result
</p>
<div class="params-title">Parameters</div>
<ul class="params">
<li>
<span class="param-name">a</span>: <span class="param-type">
number
</span>
<br/>
<p class="doc-lines">
1st integer
</p>
</li>
<li>
<span class="param-name">b</span>: <span class="param-type">
number
</span>
<br/>
<p class="doc-lines">
2nd integer
</p>
</li>
</ul>
<div class="return-type-title">Return value</div>
<div class="return-type">
<span class="param-type">
number
</span>
<p class="doc-lines">
The result of the addition
</p>
</div>
</li>
</ul>
</div>
<div class="types">
<div class="title">Types</div>
<ul class="list">
</ul>
</div>
</div>
<div class="service-footer">Powered by Ladon for Python</div>
</body>
</html>
【问题讨论】：
@Wain 这么多信息是 inof ?? 是的，更好。表明您已经尝试过并更好地描述了问题。 看看用dataUsingEncoding:创建你的jsonData。
【参考方案1】：
您使用的 URL 路径似乎有误，应更改为 http://ladonize.org/python-demos/Calculator/jsonwsp。
创建jsonData 的更好方法是使用dataUsingEncoding:。
您不应该创建响应：
NSURLResponse *theResponse =[[NSURLResponse alloc]init];
因为它将作为sendSynchronousRequest 的一部分创建并返回给您。您应该做的是检查theResponse 的内容以验证HTTP 状态代码。
【讨论】：
【参考方案2】：这是可行的解决方案...
NSString *requestString = [NSString stringWithFormat:
@"http://ladonize.org/python-demos/Calculator/jsonwsp"];
NSString *jsonString = [NSString stringWithFormat:@"\"methodname\":\"add\",\"args\": \"a\":123,\"b\":123"];
//: "methodname": "add", "args": "a":"123","b":"123"
NSLog(@"the request string is %@", requestString);
NSData *jsonData = [NSData dataWithBytes: [jsonString UTF8String] length: [jsonString length]];
NSURL *url = [NSURL URLWithString:requestString];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:@"POST"];
[request setHTTPBody: jsonData];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
[request setValue:[NSString stringWithFormat:@"%d", [jsonData length]] forHTTPHeaderField:@"Content-Length"];
NSError *errorReturned = nil;
NSURLResponse *theResponse =[[NSURLResponse alloc]init];
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&theResponse error:&errorReturned];
if (errorReturned)
NSLog(@"Error %@",errorReturned.description);
else
NSError *jsonParsingError = nil;
NSMutableArray *arrDoctorInfo = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers|NSJSONReadingAllowFragments error:&jsonParsingError];
NSString* newStr = [NSString stringWithUTF8String:[data bytes]];
NSLog(@"Dict %@",newStr);
【讨论】：
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