作为一个好的Restfull Api不仅在于service url的语义,可读性,幂等,正交，作为http状态码也很重要，一个好的Http Status Code给使用者一个很好的响应，比如200表示正常成功，201表示创建成功，409冲突，404资源不存在等等。所以在做一个基于node.js+mongodb+angularjs的demo时发现node.js express没有提供相应的辅助类，但是本人不喜欢将201,404这类毫无语言层次语义的东西到处充斥着，所以最后决定自己写一个，但是同时本人也很懒，不喜欢做重复的苦力活，怎么办？那就从我最熟悉的c#中HttpStatusCode枚举中copy出来吧，最后为了简便在mac上所以采用了利用node.js去解析msdn关于httpstatuscode的文档生成node.js的辅助类。

代码很简单：

复制代码 代码如下:
var http = require('http');

var fs = require('fs');

var $ = require('jquery');

var output = "httpStatusCode/index.js";

(function(){



String.format = function() {

var s = arguments[0];

for (var i = 0; i < arguments.length - 1; i++) {

var reg = new RegExp("\\{" + i + "\\}", "gm");

s = s.replace(reg, arguments[i + 1]);

}

return s;

};




var options = {

host:'msdn.microsoft.com',

port:80,

path:'/zh-cn/library/system.net.httpstatuscode.aspx'

};




http.get(options,function (response) {

var html = "";

response.on("data",function (chunk) {

html += chunk;

}).on("end", function () {

handler(html);

}).on('error', function (e) {

console.log("Got error: " + e.message);

});




function getHttpStatusCode(htmlString) {

var $doc = $(html);

var rows = $doc.find("table#memberList tr:gt(0)");

var status = {};

rows.each(function(i,row){

status[$(row).find("td:eq(1)").text()] =

parseInt($(row).find("td:eq(2)").text().match(/\d+/).toString());

});

return status;

};



function generateCode(status){

var code = "";

code += "exports.httpStatusCode = " + JSON.stringify(status) + ";";

return code;

};



function writeFile(code){

fs.writeFile(output, code, function(err) {

if(err) {

console.log(err);

} else {

console.log("The file was saved " + output + "!");

}

});

};




function handler(html){

var status = getHttpStatusCode(html);

var code = generateCode(status);

writeFile(code);

};




});

})();

代码寄宿在github：https://github.com/greengerong/node-httpstatuscode

最终生成类为：

复制代码 代码如下:
View Code
exports.httpStatusCode = {
"Continue": 100,
"SwitchingProtocols": 101,
"OK": 200,
"Created": 201,
"Accepted": 202,
"NonAuthoritativeInformation": 203,
"NoContent": 204,
"ResetContent": 205,
"PartialContent": 206,
"MultipleChoices": 300,
"Ambiguous": 300,
"MovedPermanently": 301,
"Moved": 301,
"Found": 302,
"Redirect": 302,
"SeeOther": 303,
"RedirectMethod": 303,
"NotModified": 304,
"UseProxy": 305,
"Unused": 306,
"TemporaryRedirect": 307,
"RedirectKeepVerb": 307,
"BadRequest": 400,
"Unauthorized": 401,
"PaymentRequired": 402,
"Forbidden": 403,
"NotFound": 404,
"MethodNotAllowed": 405,
"NotAcceptable": 406,
"ProxyAuthenticationRequired": 407,
"RequestTimeout": 408,
"Conflict": 409,
"Gone": 410,
"LengthRequired": 411,
"PreconditionFailed": 412,
"RequestEntityTooLarge": 413,
"RequestUriTooLong": 414,
"UnsupportedMediaType": 415,
"RequestedRangeNotSatisfiable": 416,
"ExpectationFailed": 417,
"UpgradeRequired": 426,
"InternalServerError": 500,
"NotImplemented": 501,
"BadGateway": 502,
"ServiceUnavailable": 503,
"GatewayTimeout": 504,
"HttpVersionNotSupported": 505
};

最后考虑到或许还有很多像我一样懒散的人，所以共享此代码发布到了npm，只需要npm install httpstatuscode，便可以简单实用，如下是一个测试demo：

复制代码 代码如下:
var httpStatusCode = require("httpstatuscode").httpStatusCode;

var toBeEqual = function (actual,expected){

if(actual !== expected){

throw (actual + " not equal " + expected);

}

};

toBeEqual(httpStatusCode.OK,200);

toBeEqual(httpStatusCode.Created,201);

toBeEqual(httpStatusCode.BadRequest,400);

toBeEqual(httpStatusCode.InternalServerError,500);




console.log(httpStatusCode);

console.log("success");

懒人的文章总是代码多余文字，希望代码能说明一切，感谢各位能阅读。