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.Net整合Json实现REST服务客户端的方法详解

2018年01月25日  | 移动技术网IT编程  | 我要评论

李斌豪,negies,java学习笔记

前言

本文主要给大家介绍了关于.net整合json实现rest服务客户端的相关内容，分享出来供大家参考学习，下面话不多说了，来一起看看详细的介绍吧。

一. 准备工作

　　1. 点击官网 或 下载支持.net4.0 的json插件 newtonsoft.json

　　2. 找到 %压缩包%\bin\net40\newtonsoft.json.dll ，在工程中引用

二. 相关代码介绍

1. httpclientutil.cs　　封装rest方法

using newtonsoft.json;
using system;
using system.collections.generic;
using system.io;
using system.linq;
using system.net;
using system.text;

namespace psi.common
{
 public class httpclientutil
 {
  // rest @get 方法，根据泛型自动转换成实体，支持list<t> 
  public static t dogetmethodtoobj<t>(string url)
  {
   httpwebrequest request = (httpwebrequest)webrequest.create(url);
   request.method = "get";
   request.contenttype = "application/json;charset=utf-8";
   httpwebresponse response = null;
   try
   {
    response = (httpwebresponse)request.getresponse();
   }
   catch (webexception e)
   {
    response = (httpwebresponse)e.response;
    return default(t);
   }
   string json = getresponsestring(response);
   return jsonconvert.deserializeobject<t>(json);
  }

  // 将 httpwebresponse 返回结果转换成 string 
  private static string getresponsestring(httpwebresponse response)
  {
   string json = null;
   using (streamreader reader = new streamreader(response.getresponsestream(), system.text.encoding.getencoding("utf-8")))
   {
    json = reader.readtoend();
   }
   return json;
  }

  // 获取异常信息 
  private static string getresterrormessage(httpwebresponse errorresponse)
  {
   string errorhtml = getresponsestring(errorresponse);
   string errorkey = "unhandledexception:";
   errorhtml = errorhtml.substring(errorhtml.indexof(errorkey) + errorkey.length);
   errorhtml = errorhtml.substring(0, errorhtml.indexof("\n"));
   return errorhtml;
  }

  // rest @post 方法 
  public static t dopostmethodtoobj<t>(string url, string jsonbody)
  {
   httpwebrequest request = (httpwebrequest)webrequest.create(url);
   request.method = "post";
   request.contenttype = "application/json;charset=utf-8";
   var stream = request.getrequeststream();
   using (var writer = new streamwriter(stream))
   {
    writer.write(jsonbody);
    writer.flush();
   }
   httpwebresponse response = (httpwebresponse)request.getresponse();
   string json = getresponsestring(response);
   return jsonconvert.deserializeobject<t>(json);
  }

  // rest @put 方法 
  public static string doputmethod(string url)
  {
   httpwebrequest request = (httpwebrequest)webrequest.create(url);
   request.method = "put";
   request.contenttype = "application/json;charset=utf-8";
   httpwebresponse response = (httpwebresponse)request.getresponse();
   using (streamreader reader = new streamreader(response.getresponsestream(), system.text.encoding.getencoding("utf-8")))
   {
    return reader.readtoend();
   }
  }

  // rest @put 方法，带发送内容主体 
  public static t doputmethodtoobj<t>(string url, string jsonbody)
  {
   httpwebrequest request = (httpwebrequest)webrequest.create(url);
   request.method = "put";
   request.contenttype = "application/json;charset=utf-8";
   request.timeout = 30 * 1000;
   var stream = request.getrequeststream();
   using (var writer = new streamwriter(stream))
   {
    writer.write(jsonbody);
    writer.flush();
   }
   httpwebresponse response = (httpwebresponse)request.getresponse();
   string json = getresponsestring(response);
   return jsonconvert.deserializeobject<t>(json);
  }

  // rest @delete 方法 
  public static bool dodeletemethod(string url)
  {
   httpwebrequest request = (httpwebrequest)webrequest.create(url);
   request.method = "delete";
   request.contenttype = "application/json;charset=utf-8";
   httpwebresponse response = (httpwebresponse)request.getresponse();
   using (streamreader reader = new streamreader(response.getresponsestream(), system.text.encoding.getencoding("utf-8")))
   {
    string responsestring = reader.readtoend();
    if (responsestring.equals("1"))
    {
     return true;
    }
    return false;
   }
  } 
 }
}

2. 调用rest服务端方法，以json作为数据格式

/// <summary>
/// 取得升级服务端的url地址
/// </summary>
/// <returns></returns>
private string getserverurl()
{
 string result = "";
 upgraderclient upgraderclient = getupgraderclient();
 if (upgraderclient != null)
 {
  result += "http://" + upgraderclient.serverip +
   ":" + upgraderclient.serverport +
   "/upgraderserver/service/upgrade.do";
 }
 return result;
}

/// <summary>
/// 测试与升级服务端的连接
/// </summary>
/// <returns></returns>
public bool testconnect()
{
 filerequest filereq = new filerequest();
 filereq.type = (int)requesttype.test_connect;
 string jsondata = jsonconvert.serializeobject(filereq);
 fileresponse rep = null;
 try
 {
  rep = httpclientutil.dopostmethodtoobj<fileresponse>(getserverurl(), jsondata);
 } catch
 {
  throw new exception("连接远程服务端失败！");
 }
 return rep.status == 200;
}

总结

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