\x 开头编码的数据解码成中文

Python 解码

b=b'\xE8\xA7\xA3\xE5\x86\xB3'
b.decode('utf-8')
'解决'

Java 解码

public static void main(String[] args) throws UnsupportedEncodingException{        
    String utf8String = "\\xE8\\xA7\\xA3\\xE5\\x86\\xB3";
    System.out.println(decodeUTF8Str(utf8String));    
}
public static String decodeUTF8Str(String xStr) throws UnsupportedEncodingException {        
    return URLDecoder.decode(xStr.replaceAll("\\\\x", "%"), "utf-8");    
}　
以上代码输出:
解决
Process finished with exit code 0

Javascript编解码

解码

function decode(str){
        return str.replace(/\\x(\w{2})/g,function(_,$1){

return String.fromCharCode(parseInt($1,16)) }

);
}

eg.

decode(‘\xE8\xA7\xA3\xE5\x86\xB3’) //解决

编码

function encode(str){    
     return str.replace(/(\w)/g,function(_,$1){ 
         return "\\x"+ $1.charCodeAt(0).toString(16) }
     );
}
eg.
encode("解决")  //"\xE8\xA7\xA3\xE5\x86\xB3"

深入理解

要了解原理，推荐阅读，UTF-8是unicode编码的一种落地方案：

UTF-8是unicode编码的一种落地方案：
Unicode符号范围      | UTF-8编码方式
(十六进制)           | （二进制）
--------------------+---------------------------------------------
0000 0000-0000 007F | 0xxxxxxx
0000 0080-0000 07FF | 110xxxxx 10xxxxxx
0000 0800-0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx
0001 0000-0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx

\x对应的是UTF-8编码的数据，通过转化规则可以转换为Unicode编码，就能得到对应的汉字，转换规则很简单，先将\x去掉，转换为数字，然后进行对应的位移操作即可，需要注意的是先要判断utf-8的位数。可以通过下面的scala代码深入了解：

 val pattern = """(\d+\.\d+\.\d+\.\d+) \- (\S+) (\S+) \[([^\]]+)\] \"(\w+) (\S+) \S+\" (\S+) (\S+) \"([^\"]+)\" \"([^\"]+)\" \"([^\"]+)\" \"([^\"]+)""".r
  val decodeDataPattern = """(\\x([0-9A-Z]){2})+""".r
  def decodeUtf8(utf8Str:String):String={
    var data =   decodeDataPattern.replaceAllIn(utf8Str, m=>{
        var item = decodeXdata(m.toString())
        item
     }) 
     return data
   }
     
   def decodeXdata(utf8Str:String):String={
     var arr = utf8Str.split("\\\\x")
     var result = new StringBuilder()
     var isMatchEnd = true
     var matchIndex = 0
     var currentWordLength = 0
     var current = 0
     var e0=0xe0;
     
     for(item <-arr){
        var str = item.trim
        if(str.length()>0){
           var currentCode =  Integer.parseInt(str, 16);
           if(isMatchEnd){
             isMatchEnd = false
             var and = currentCode & e0;
             if(and == 0xe0){
                matchIndex = 1;
                currentWordLength = 3;
                current =  (currentCode & 0x1f) <<12  // 3位编码的
             }else if(and==96){
                matchIndex = 1;
                currentWordLength = 2;
                current =  (currentCode & 0x1f) <<6 // 2位编码的
             }else{
               current = currentCode  // 1位编码的
             }
          }else{
            matchIndex = matchIndex+1;
            if(matchIndex == 2)
            {
              current+=(currentCode & 0x3f) <<6
            }else{
               current+=(currentCode & 0x3f) 
            }
          }
           if(matchIndex==currentWordLength){
               var hex = Integer.toHexString(current)
               hex = if(hex.length()<4) "\\u00"+hex else "\\u"+hex  //补0
               result.append(new String(StringEscapeUtils.unescapeJava(hex).getBytes,"utf-8")) 
               current = 0
               matchIndex=0
               isMatchEnd = true
           }
        }
     }
     
     return result.toString()
   }