[C#.NET] 如何利用 JSON API 分析 IP Location

當我們知道一個IP Address後要如何更進一步的知道這個IP的資訊??在網路上爬了一段文，得知可以使用 http://ipinfodb.com/index.php 所提供的API來處理，這個網頁提供了XML API以及JSON API，很可惜站上並無.NET的範例程式碼，只好自己動手處理，原理很簡單，只要送出WebResquest後就能取得結果。





我們可以利用這個查詢字串，送出WebResquest，它就會回傳相關欄位了，下圖是它回傳的欄位





程式開始前必須要向官網申請Key http://ipinfodb.com/register.php

建立欄位類別

[Serializable]
public class JsonIpinfodbLocationField
{
public string StatusCode { get; set; }
public string StatusMessage { get; set; }
public string ipAddress { get; set; }
public string CountryCode { get; set; }
public string CountryName { get; set; }
public string RegionName { get; set; }
public string CityName { get; set; }
public string ZipCode { get; set; }
public string Latitude { get; set; }
public string Longitude { get; set; }
public string TimeZone { get; set; }
}

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

使用Json API

鍵入以下程式碼：

public JsonIpinfodbLocationField GetIpDetail(string ipAddress)
{
string ip = string.Empty;
Encoding sourceEncoding = Encoding.UTF8;
string connectString = string.Format("http://api.ipinfodb.com/v3/ip-city/?key={0}&ip={1}&format=json", "輸入自己申請的Key", ipAddress);

StringBuilder ipInfo = new StringBuilder();
Stream webStream = null;
StreamReader streamReader = null;
try
{
//1.取得Response串流
webStream = WebRequest.Create(connectString).GetResponse().GetResponseStream();
streamReader = new StreamReader(webStream, sourceEncoding);
//2.分批讀取到StringBuilder
char[] buffer = new char[256];
int readLength = streamReader.Read(buffer, 0, buffer.Length);
while (readLength > 0)
{
byte[] dataArray = sourceEncoding.GetBytes(buffer, 0, readLength);
ipInfo.Append(sourceEncoding.GetString(dataArray));
readLength = streamReader.Read(buffer, 0, buffer.Length);
}
//3.利用JavaScriptSerializer反序列化處理Json
JavaScriptSerializer scriptSerializer = new JavaScriptSerializer();
object obj = scriptSerializer.Deserialize<JsonIpinfodbLocationField>(ipInfo.ToString());

return obj as JsonIpinfodbLocationField;
}
finally
{
if (webStream != null)
webStream.Close();
if (streamReader != null)
streamReader.Close();
}
}.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

PS.上面程式碼是分批讀取，當然也可以直接用streamReader.ReadToEnd方法讀取全部。

還沒有反序列化前的資料長這樣，看起來得再處理一下。





透過 JavaScriptSerializer 反序列化後得到了正確的結果，省掉了做苦工的時間。





PS.使用JavaScriptSerializer類別時，必須要手動加入參考：System.Web.Extensions.dll





使用XML API
把json換成xml

public JsonIpinfodbLocationField GetIpDetail(string ipAddress)
{
string ip = string.Empty;
Encoding sourceEncoding = Encoding.UTF8;
string connectString = string.Format("http://api.ipinfodb.com/v3/ip-city/?key={0}&ip={1}&format=xml", "輸入自己申請的Key", ipAddress);

StringBuilder ipInfo = new StringBuilder();
Stream webStream = null;
StreamReader streamReader = null;
try
{
//1.取得Response串流
webStream = WebRequest.Create(connectString).GetResponse().GetResponseStream();
streamReader = new StreamReader(webStream, sourceEncoding);
//2.分批讀取到StringBuilder
char[] buffer = new char[256];
int readLength = streamReader.Read(buffer, 0, buffer.Length);
while (readLength > 0)
{
byte[] dataArray = sourceEncoding.GetBytes(buffer, 0, readLength);
ipInfo.Append(sourceEncoding.GetString(dataArray));
readLength = streamReader.Read(buffer, 0, buffer.Length);
}
//3.讀取xml
return getXmlFormat(ipInfo.ToString());
}
finally
{
if (webStream != null)
webStream.Close();
if (streamReader != null)
streamReader.Close();
}
}.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

ipInfo 會得到XML結構，我試了一下，這個結構並沒有辦法可以直接反序列化的方式，如果有人試出來了麻煩告知我一下。





所以我就利用 XDocument 讀取 Xml

JsonIpinfodbLocationField getXmlFormat(string ipInfo)
{
JsonIpinfodbLocationField field = new JsonIpinfodbLocationField();
XDocument doc = XDocument.Parse(ipInfo);

field.CityName = doc.Elements().Select(a => a.Element("cityName").Value).FirstOrDefault();
field.CountryCode = doc.Elements().Select(a => a.Element("countryCode").Value).FirstOrDefault();
field.CountryName = doc.Elements().Select(a => a.Element("countryName").Value).FirstOrDefault();
field.ipAddress = doc.Elements().Select(a => a.Element("ipAddress").Value).FirstOrDefault();
field.Latitude = doc.Elements().Select(a => a.Element("latitude").Value).FirstOrDefault();
field.Longitude = doc.Elements().Select(a => a.Element("longitude").Value).FirstOrDefault();
field.RegionName = doc.Elements().Select(a => a.Element("regionName").Value).FirstOrDefault();
field.StatusCode = doc.Elements().Select(a => a.Element("statusCode").Value).FirstOrDefault();
field.StatusMessage = doc.Elements().Select(a => a.Element("statusMessage").Value).FirstOrDefault();
field.TimeZone = doc.Elements().Select(a => a.Element("timeZone").Value).FirstOrDefault();
field.ZipCode = doc.Elements().Select(a => a.Element("zipCode").Value).FirstOrDefault();

return field;
}.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

最後所得到以下結果。





後記：
除了http://ipinfodb.com/index.php外還有一個網站也提供了相關的功能http://freegeoip.net/static/index.html，用法都大同小益





補充：
Xml沒辦法轉的原因是我自己的問題，本以為透過Stream直接反序列就好了，沒想到事實上並不是這樣

XmlSerializer xml = new XmlSerializer(typeof(JsonIpinfodbLocationField));
object obj = xml.Deserialize(streamReader);

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

重新定義Entity類別

[Serializable]
[XmlRoot("Response")]
public class JsonIpinfodbLocationField
{
[XmlElement("statusCode")]
public string StatusCode { get; set; }

[XmlElement("statusMessage")]
public string StatusMessage { get; set; }

[XmlElement("ipAddress")]
public string IpAddress { get; set; }

[XmlElement("countryCode")]
public string CountryCode { get; set; }

[XmlElement("countryName")]
public string CountryName { get; set; }

[XmlElement("regionName")]
public string RegionName { get; set; }

[XmlElement("cityName")]
public string CityName { get; set; }

[XmlElement("zipCode")]
public string ZipCode { get; set; }

[XmlElement("latitude")]
public string Latitude { get; set; }

[XmlElement("longitude")]
public string Longitude { get; set; }

[XmlElement("timeZone")]
public string TimeZone { get; set; }
}

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

改寫Method，將字串 data 丟到 MemoryStream 再反序列化即可

public JsonIpinfodbLocationField GetIpDetail(string ipAddress)
{
string ip = string.Empty;
Encoding sourceEncoding = Encoding.UTF8;
string connectString = string.Format("http://api.ipinfodb.com/v3/ip-city/?key={0}&ip={1}&format=xml", "輸入申請的KEY", ipAddress);

StringBuilder ipInfo = new StringBuilder();
Stream webStream = null;
StreamReader streamReader = null;
try
{
//1.取得Response串流
webStream = WebRequest.Create(connectString).GetResponse().GetResponseStream();
streamReader = new StreamReader(webStream, sourceEncoding);
//2.分批讀取到StringBuilder
char[] buffer = new char[256];
int readLength = streamReader.Read(buffer, 0, buffer.Length);
while (readLength > 0)
{
byte[] dataArray = sourceEncoding.GetBytes(buffer, 0, readLength);
ipInfo.Append(sourceEncoding.GetString(dataArray));
readLength = streamReader.Read(buffer, 0, buffer.Length);
}
        string data = ipInfo.ToString();

byte[] byteArray = sourceEncoding.GetBytes(data);
MemoryStream memoryStream = new MemoryStream(byteArray);

XmlSerializer xml = new XmlSerializer(typeof(JsonIpinfodbLocationField));
object obj = xml.Deserialize(memoryStream);

return obj as JsonIpinfodbLocationField;
}
finally
{
if (webStream!=null)
webStream.Close();
if (streamReader!=null)
streamReader.Close();
}
}

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

再此感謝91哥的回覆。

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }