[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8},"actionData","errors","root",{"_11":-5,"_53":54,"_55":56,"_57":58},"routes/user.$name.topics",{"_9":10,"_11":12,"_13":14,"_15":16,"_17":18,"_19":16},"topics",[35],"user",{"_20":21,"_13":14,"_22":23,"_24":25,"_26":27,"_28":29,"_30":16,"_31":32,"_33":34},"loginname","seon","page",1,"limit",20,"total","id","620","avatar_url","http://www.gravatar.com/avatar/bf4f4a3050294fbe3024f9efe7f0c740?s=48","githubUsername","","create_at","2011-09-10T05:20:00.000Z","score",5,"topic_count","reply_count",0,"is_star",false,{"_20":36,"_37":21,"_38":-5,"_39":40,"_41":42,"_43":44,"_45":34,"_46":34,"_31":47,"_48":49,"_26":50,"_51":52},"66","author_id","tab","content","很早就听说过node的大名了，只是一直没有去尝试。直到最近，为了简化代码上线流程，提高上线效率，决定使用node来开发服务器端的上线程序。\r\n
\r\n
服务器主要完成在svn服务器上创建tag，代码的合并、压缩与打包，压缩包提交至CMS服务器，经由CMS服务器发布至全网cdn等一系列的流程。\r\n
\r\n
开始的一系列开发工作都比较顺利，但是，当做到将压缩包上传至CMS服务器时，遇到了困难。我不知道该如何通过node发起一条带有文件的post请求。。。\r\n
\r\n
通过查阅node的api手册，发现node是支持在服务器端发起http请求的。那么，剩下的麻烦的问题，就是，该如何构造该请求。\r\n
\r\n
之前虽然也写过一段时间的后端代码，但是都是通过封装好的接口来实现的，但对于node来说，没有现成的实现。无奈，只好向google求助。\r\n
\r\n
很快搜到了一篇帖子，介绍相关内容的，并且还附赠了代码！不过可惜的是，所附的代码还是存在问题，估计作者并没有亲测过。但这篇帖子却着实的让我受到了很大的启发，至少让我清楚了两件事情：1、上传文件的http请求的body部分的格式；2、文件转化为http数据流的方式！\r\n
\r\n
基于以上两点，我慢慢摸索出了上传文件的方法，在这里跟大家分享以下！\r\n
\r\n
先简单的描述下http协议分包传输时的数据格式。\r\n
\r\n
Content-type\r\n
\r\n
Content-type需要指定为\r\n

multipart/form-data; boundary=' + boundaryKey

\r\n
其中boundaryKey为一随机字符串，用于标识请求数据段。\r\n
\r\n
请求体格式\r\n
\r\n
每一段请求体均以\"--\" + boundaryKey开头，然后使用'\\r\\n'来做行分隔。\r\n
\r\n
接下来是每一段请求体的描述信息，包括Content-Type以及

Content-Disposition

等字段信息。每一个字段信息结尾都以'\\r\\n'来标识行结束。\r\n
\r\n
描述信息与请求体正文需要以一个空行隔开，即需要再输出一个'\\r\\n'。\r\n
\r\n
最后是请求提正文。\r\n
\r\n
直到最后一个请求体结束之后，再输出'\\r\\n--' + boundaryKey + '--'作为整个请求的结束。\r\n
\r\n
这样即完成了一次post请求所需的基本内容了。\r\n
\r\n
接下来，在介绍下，将文件转换为http数据流所需要做的工作。\r\n
\r\n
转换的基本过程：\r\n

调用http.request方法，返回一个

http.ClientRequest类的实例

。

http.ClientRequest的实例本质上来说是一个

writable stream。

对要上传的文件创建一个读取文件流。

将从文件读取到的流数据写到http请求数据流中。

关闭http请求。

\r\n
所需要用到的接口：\r\n

http.request

createReadStream

stream.pipe

stream.on('end')事件

\r\n
综合以上内容，给出简单实现的代码，供大家参考，欢迎大家交流！\r\n

function upload(){\r\n
    var boundaryKey = '----' + new Date().getTime();\r\n
    var options = {\r\n
        host:'www.test.com',//远端服务器域名\r\n
        port:80,//远端服务器端口号\r\n
        method:'POST',\r\n
        path:'/upload',//上传服务路径\r\n
        headers:{\r\n
            'Content-Type':'multipart/form-data; boundary=' + boundaryKey,\r\n
            'Connection':'keep-alive'\r\n
        }\r\n
    };\r\n
    var req = http.request(options,function(res){\r\n
        res.setEncoding('utf8');\r\n
        res.on('data', function (chunk) {\r\n
            console.log('body: ' + chunk);\r\n
        });\r\n
        res.on('end',function(){\r\n
            console.log('res end.');\r\n
        });\r\n
    });\r\n
    req.write(\r\n
        '--' + boundaryKey + '\\r\\n' +\r\n
        'Content-Disposition: form-data; name=\"upload\"; filename=\"test.zip\"\\r\\n' +\r\n
        'Content-Type: application/x-zip-compressed\\r\\n\\r\\n'\r\n
    );\r\n
    //设置1M的缓冲区\r\n
    var fileStream = fs.createReadStream('/data/test.zip',{bufferSize:1024 * 1024});\r\n
    fileStream.pipe(req,{end:false});\r\n
    fileStream.on('end',function(){\r\n
        req.end('\\r\\n--' + boundaryKey + '--');\r\n
    });\r\n
}

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