背景
笔者最近在做非标自动化的标准化工作,其中一项工作就是要求设备厂商按照MES厂商(我司)的要求,开放一个接口接收MES的派工任务。
厂商只要实现这个接口,我们就可以通过java调用厂商的服务了,于是有了这篇文章,文章只是抛砖引玉,实现方式供参考。
代码实现
1、Visual Stduio新建asp.net项目,新建一个ashx文件,代码如下
sendOrder.ashx
using System.IO;
using System.Text;
using System.Web;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
using AST_AUTO.Models;
namespace AST_AUTO
{
/// <summary>
/// Handler1 的摘要说明
/// </summary>
public class OrderReceiveHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
var request = context.Request;
var response = context.Response;
var contentType = request.ContentType;
var httpMethod = request.HttpMethod;
if (httpMethod == "POST" && contentType.StartsWith("application/json"))
{
response.ContentType = "application/json; charset=UTF-8";
Stream bodyStream = context.Request.InputStream;
string requestPayload = string.Empty;
bodyStream.Position = 0;
using (var streamReader = new StreamReader(bodyStream, Encoding.UTF8))
{
//读取Body的时候,请尽量使用异步方式读取。ASP.NET Core默认是不支持同步读取的,会抛出异常
//解决方法 启用 KestrelServerOptions 中 AllowSynchronousIO
requestPayload = streamReader.ReadToEnd();
bodyStream.Position = 0;
}
//反序列化
ReceiveOrder order = (ReceiveOrder)JsonConvert.DeserializeObject(requestPayload,typeof(ReceiveOrder));
Models.ComResult<string> result = new Models.ComResult<string>();
result.Success = false;
result.Data = "0x123 read image buffer error!";
result.Code = "PLC_ERROR_01";
result.Message = "PLC设备XXX未就绪";
string json = JsonConvert.SerializeObject(result, new JsonSerializerSettings
{
ContractResolver = new CamelCasePropertyNamesContractResolver()
});
response.Write(context.Server.UrlDecode(json));
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
ComResult.cs如下
namespace AST_AUTO.Models
{
public class ComResult<T>
{
private bool _success;
private string _message;
private string _code;
private T _data;
public bool Success { get => _success; set => _success = value; }
public string Message { get => _message; set => _message = value; }
public string Code { get => _code; set => _code = value; }
public T Data { get => _data; set => _data = value; }
}
}
package.json
<?xml version="1.0" encoding="utf-8"?>
<packages>
<!--其他省略-->
<package id="Newtonsoft.Json" version="12.0.2" targetFramework="net45" />
</packages>
测试
输入参数:
{
"dispatchNo": "1000021-10010",
"dispatchQuantity": 100
}
输出参数:
{
"success": false,
"message": "PLC设备XXX未就绪",
"code": "PLC_ERROR_01",
"data": "0x123 read image buffer error!"
}