linux部署.net core api并且实现上传图片

为了体验.net在linux上运行，所以使用httpclient东借西抄做了一个简单的api上传功能。

第一步，简单的上传功能：

  

 public class uploadhelper
    {
        private static readonly string controller = "/api/upload";
        /// <summary>
        /// 使用httpclient上传附件
        /// </summary>
        /// <param name="filepath"></param>
        /// <returns></returns>
        public static async task<string> upload(string filepath)
        {
            filestream filestream = new filestream(filepath, filemode.open, fileaccess.read, fileshare.read);
            httpcontent httpcontent = new streamcontent(filestream);
            httpcontent.headers.contenttype = mediatypeheadervalue.parse("multipart/form-data");
            string filename = filepath.substring(filepath.lastindexof("\\") + 2);
            namevaluecollection namevaluecollection = new namevaluecollection();
            namevaluecollection.add("user-agent", "user-agent    mozilla/5.0 (windows nt 10.0; wow64; trident/7.0; touch; malnjs; rv:11.0) like gecko");
            using (multipartformdatacontent mulcontent = new multipartformdatacontent("----webkitformboundaryrxrbklheecbfhiy"))
            {
                mulcontent.add(httpcontent, "file", filename);
                string ip = configurationprovider.configuration.getsection("webapi:httpaddresss").value;
                string url = "http://"+ip + controller;
                return await httphelper.posthttpclient(url, namevaluecollection, mulcontent);
            }

        }
    }
 public class httphelper
    {
        /// <summary>
        /// httpclient post请求
        /// </summary>
        /// <param name="url"></param>
        /// <param name="requestheaders"></param>
        /// <param name="multipartformdatacontent"></param>
        /// <returns></returns>
        public  static async task<string>  posthttpclient(string url, namevaluecollection requestheaders,
             multipartformdatacontent multipartformdatacontent)
        {
            var handler = new httpclienthandler();
            handler.servercertificatecustomvalidationcallback = delegate { return true; };
            using (httpclient client = new httpclient(handler))
            {
                client.maxresponsecontentbuffersize = 256000;
                client.defaultrequestheaders.add(requestheaders.keys[0],requestheaders[requestheaders.keys[0]]);
                httpresponsemessage httpresponsemessage = await client.postasync(url, multipartformdatacontent);
                httpresponsemessage.ensuresuccessstatuscode();
                string result = httpresponsemessage.content.readasstringasync().result;
                return result;
            }
        }
    }

然后自己再写一个api程序做为服务端用来接收请求，如下代码：

    [route("api/[controller]")]
    [apicontroller]
    public class uploadcontroller : controllerbase
    {
        private ihostingenvironment hostingenvironment;
        public uploadcontroller(ihostingenvironment _hostingenvironment)
        {
            hostingenvironment = _hostingenvironment;
        }
        [httppost]
        public iactionresult upload()
        {
            try
            {
                var imgfile = request.form.files[0];
                int index = imgfile.filename.lastindexof('.');
                //获取后缀名
                string extension = imgfile.filename.substring(index, imgfile.filename.length - index);
                string webpath = hostingenvironment.contentrootpath;
                string guid = guid.newguid().tostring().replace("-", "");
                string newfilename = guid + extension;
                datetime datetime = datetime.now;
                //linux环境目录为/{1}/
                string path = string.format(@"{0}/temporaryfile/{1}/{2}/{3}", "/home/www", datetime.year.tostring(), datetime.month.tostring()
                    , datetime.day.tostring());
                if (!directory.exists(path))
                    directory.createdirectory(path);
                string imgsrc = path + @"/" + newfilename;
                using (filestream fs = system.io.file.create(imgsrc))
                {
                    imgfile.copyto(fs);
                    fs.flush();
                }
                return new jsonresult(new { message = "ok", code = 200 });
            }
            catch (exception e)
            {
                return new jsonresult(new {message=e.message,code=500});
            }
        }

api程序记得修改program.cs

 

  public class program
    {
        public static void main(string[] args)
        {
            createwebhostbuilder(args).build().run();
        }
         //本地启动
        //public static iwebhostbuilder createwebhostbuilder(string[] args) =>
        //    webhost.createdefaultbuilder(args).useurls("http://*:5000")
        //        .usestartup<startup>();
        //linux启动
        public static iwebhostbuilder createwebhostbuilder(string[] args) =>
            webhost.createdefaultbuilder(args)
                .usestartup<startup>();
    }

当时我访问出现502就是因为这个原因

然后本地测试可以之后再将api部署到linux服务器，部署linux需要一下工具：

 xftp:将发布好的api程序传到linux，

ngnix：反向代理，参考菜鸟教程，我的配置是这个，记得将5000加入防火墙，并且网络策略这个端口：

user www www;
worker_processes 2; #设置值和cpu核心数一致
error_log /usr/local/webserver/nginx/logs/nginx_error.log crit; #日志位置和日志级别
pid /usr/local/webserver/nginx/nginx.pid;
#specifies the value for maximum file descriptors that can be opened by this process.
worker_rlimit_nofile 65535;
events
{
  use epoll;
  worker_connections 65535;
}
http
{
 
 #下面是server虚拟主机的配置
        server {
    listen 80;
    location / {
        proxy_pass http://localhost:5000;
        proxy_http_version 1.1;
        proxy_set_header upgrade $http_upgrade;
        proxy_set_header connection keep-alive;
        proxy_set_header host $host;
        proxy_cache_bypass $http_upgrade;
    }
}

}

具体的部署过程网上很多教程。部署好之后就可以试着用postman或浏览器输入地址访问了。

因为linux的机制当你退出linux后就无法访问，所以需要配置进程守护，我的配置如下

[program:blogapi]
command=dotnet blogapi.dll
directory=/home/wwwroot/blogapi/
stderr_logfile=/var/log/blogapi.error.log
stdout_logfile=/var/log/blogapi.stdout.log
environment=aspnetcore_environment=production
user=root
stopsignal=int
autostart=true
autorestart=true
startsecs=3

更新重启守护进程，然后你就可以随时随地访问了，

 

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