我正在尝试通过TcpClient(byte [])发送包含特殊字符的字符串.这是一个例子：

>客户在文本框中输入“amé”
>客户端使用特定编码将字符串转换为byte [](我已经尝试了所有预定义的加上一些像“iso-8859-1”)
>客户端通过TCP发送byte []
>服务器接收并输出使用相同编码重新转换的字符串(到列表框)

编辑：

我忘了提到结果字符串是“我？”.

编辑-2(根据要求,这里是一些代码)：

@DJKRAZE这里有一些代码：

byte[] buffer = Encoding.ASCII.GetBytes("amé");
(TcpClient)server.Client.Send(buffer);

在服务器端：

byte[] buffer = new byte[1024];
Client.Recieve(buffer);
string message = Encoding.ASCII.GetString(buffer);
ListBox1.Items.Add(message);

列表框中显示的字符串是“am？”

===解决方案===

Encoding encoding = Encoding.GetEncoding("iso-8859-1");
byte[] message = encoding.GetBytes("babé");

更新：

只需使用Encoding.Utf8.GetBytes(“ééé”);奇迹般有效.

我想回答一个问题永远不会太晚,希望有人能在这里找到答案.

C#使用16位字符,ASCII将它们截断为8位,以适合一个字节.经过一番研究,我发现UTF-8是特殊字符的最佳编码.

//data to send via TCP or any stream/file
byte[] string_to_send = UTF8Encoding.UTF8.GetBytes("amé");

//when receiving,pass the array in this to get the string back
string received_string = UTF8Encoding.UTF8.GetString(message_to_send);

尝试使用 Exchange Web Services Managed API针对Exchange Server 2010 SP1发送电子邮件时,如果收件人电子邮件地址(@的左侧)包含丹麦语字母æøå,则会引发ServiceException,其中包含ErrorCode ErrorInvalidRecipients.

这些字符是不允许在电子邮件地址的本地部分,还是我应该以某种方式编码地址？

更新：这是测试源代码和跟踪数据：

var service = new ExchangeService(ExchangeVersion.Exchange2010_SP1);
service.AutodiscoverUrl("my@email.com");
EmailMessage email = new EmailMessage(service);
email.Body = "Test";
email.Subject = "Test";
email.ToRecipients.Add("æøå@domain.com");
email.Send();

来自EWS的跟踪数据显示以下内容：

请求标头：

POST /EWS/Exchange.asmx HTTP/1.1
Content-Type: text/xml; charset=utf-8
Accept: text/xml
User-Agent: ExchangeServicesClient/14.03.0032.000
Accept-Encoding: gzip,deflate

请求：

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Header>
    <t:RequestServerVersion Version="Exchange2010_SP1" />
  </soap:Header>
  <soap:Body>
    <m:CreateItem Messagedisposition="SendOnly">
      <m:Items>
        <t:Message>
          <t:Subject>Test</t:Subject>
          <t:Body BodyType="HTML">Test</t:Body>
          <t:ToRecipients>
            <t:MailBox>
              <t:EmailAddress>æøå@domain.com</t:EmailAddress>
            </t:MailBox>
          </t:ToRecipients>
        </t:Message>
      </m:Items>
    </m:CreateItem>
  </soap:Body>
</soap:Envelope>

响应：

<?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
  <s:Header>
    <h:ServerVersionInfo MajorVersion="14" MinorVersion="1" MajorBuildNumber="438" MinorBuildNumber="0" Version="Exchange2010_SP1" xmlns:h="http://schemas.microsoft.com/exchange/services/2006/types" xmlns="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" />
  </s:Header>
  <s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <m:CreateItemResponse xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
      <m:ResponseMessages>
        <m:CreateItemResponseMessage Response>
          <m:MessageText>One or more recipients are invalid.</m:MessageText>
          <m:ResponseCode>ErrorInvalidRecipients</m:ResponseCode>
          <m:DescriptiveLinkKey>0</m:DescriptiveLinkKey>
          <m:Items />
        </m:CreateItemResponseMessage>
      </m:ResponseMessages>
    </m:CreateItemResponse>
  </s:Body>
</s:Envelope>

最后,在Outlook中创建一个这样的地址的电子邮件给出了这样的信息：

根据本文处理Exchange收件人解析,您可能需要使用此方法对这些字符进行编码：

Alphanumeric characters,the equal sign (=) and the hyphen (-) don’t
require encoding. Other characters use the following encoding Syntax:
A forward slash (/) is replaced by an underscore (_). Other US-ASCII
characters are replaced by a plus sign (+) and the two digits of its
ASCII value are written in hexadecimal. For example,the space
character has the encoded value +20.

http://technet.microsoft.com/en-us/library/bb430743(v=exchg.141).aspx

所以你的“æøå@domain.com”的例子将成为“e6 f8 e5@domain.com”

编辑：

如果地址的“域”部分使用特殊字符,则还需要使用不同的方法对其进行编码.

这是一个GetExchangeEncodedRecipient助手方法,我把它放在一起使用RFC 5321和RFC 3461规范对电子邮件地址进行编码.

public static string GetExchangeEncodedRecipient(string recipient) {
        int atIdx = recipient.LastIndexOf('@');

        if (atIdx < 0) {
            throw new ArgumentException("Unable to parse domain portion of \"recipient\" email address.");
        }

        string namepart = recipient.Substring(0,atIdx);
        string domainPart = recipient.Substring(atIdx + 1);
        //need to encode any special characters in the domain name
        System.Globalization.IdnMapping punycode = new System.Globalization.IdnMapping();
        domainPart = "@" + punycode.GetAscii(domainPart);

        return String.Concat(namepart.Select(c => GetExchangeEncodedChar(c))) + domainPart;
    }
    private static string GetExchangeEncodedChar(char c) {
        string encodedChar = c.ToString();
        int charaSCIICode = (int)c;
        //Encode according to RFC5321,https://tools.ietf.org/html/rfc5321#section-4.1.2
        //  which references rfc3461 "xtext" format. https://tools.ietf.org/html/rfc3461#section-4 
        if(charaSCIICode >= 33 && charaSCIICode <= 126 && c != '+' && c != '=')
        {
            //This is a character in the valid 33-126 ASCII range for email addresses,which does not need encoded.
            return c.ToString();
        }
        else if(c == '/'){
            //A forward slash (/) is replaced by an underscore (_).
            return "_";
        }
        else { 
            return "+" + ((int)c).ToString("x2").toupper();
        }
    }

然后,您可以使用GetExchangeEncodedRecipient对地址进行编码.这是一个例子：

string recipient = @"user1æøå@dømain.com";
string encodedAddress = GetExchangeEncodedRecipient(recipient);
Console.WriteLine("Original: {0},Encoded: {1}",recipient,encodedAddress);

对于上面的示例收件人,将输出：

Original: user1æøå@dømain.com,Encoded: user1+E6+F8+E5@xn--dmain-vua.com

如果您使用的“普通”电子邮件地址不包含“普通”ASCII范围之外的任何字符,那么它将返回相同的字符串.

Original: jsmith01@gmail.com,Encoded: jsmith01@gmail.com

我必须构建sqlite数据库,在那里我存储一些具有一些特殊字符的字符串,对于大多数情况,它工作查找除了这一个

SELECT * FROM table1 WHERE use_id = 3B:02

它抛出了这个错误

android.database.sqlite.sqliteException: near ":02": Syntax error (code 1):

当“3B：02”变化时,我该如何处理呢？

这是我的查询

selectQuery = "SELECT * FROM " + DataBaseHelper.TABLE_COM + " WHERE "
                + DataBaseHelper.COLUMN_USER_ID + " = " + value;

sql中的字符串文字值必须在“单引号”中.

但是,最好使用？文字的占位符并绑定值,例如

Cursor c = db.rawQuery("SELECT * FROM " + DataBaseHelper.TABLE_COM + " WHERE "
            + DataBaseHelper.COLUMN_USER_ID + " = ?",new String[] { value });

我正在尝试下载包含斯洛文尼亚字符的json文件,在下载json文件作为字符串时,我将获得json数据中指定的特殊字符

"send_mail": "Po�lji elektronsko sporocilo.","str_comments_likes": "Komentarji,v�ecki in mejniki",

我正在使用的代码

URL url = new URL(f_url[0]);
URLConnection conection = url.openConnection();
conection.connect();
try {
    InputStream input1 = new BufferedInputStream(url.openStream(),300);
    String myData = "";
    BufferedReader r = new BufferedReader(new InputStreamReader(input1));
    StringBuilder totalValue = new StringBuilder();
    String line;
    while ((line = r.readLine()) != null) {
        totalValue.append(line).append('\n');
    }
    input1.close();
    String value = totalValue.toString();
    Log.v("To Check Problem from http paramers",value);
} catch (Exception e) {
    Log.v("Exception Character Isssue","" + e.getMessage());
}

我想知道如何正确下载字符.

您需要将字符串字节编码为UTF-8.请检查以下代码：

String slovenianjsON = new String(value.getBytes([Original Code]),"utf-8");
JSONObject newJSON = new JSONObject(reconstitutedJSONString);
String javaStringValue = newJSON.getString("content");

我希望它会对你有所帮助！