Unicode与中文转换工具类

在上一家公司做Android注入时，如果注入中文会有问题，需要将中文转换为unicode码注入，在网上查了一下转换工具类，大多数都是如下的解决方案：

public class CharacterSetToolkit {
    
     /** Creates a new instance of CharacterSetToolkit */
     public CharacterSetToolkit() {
     }
    
     private static final char[] hexDigit = {
         '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'
     };
    
     private static char toHex(int nibble) {
         return hexDigit[(nibble & 0xF)];
     }
    
     /**
      * 将字符串编码成 Unicode 。
      * @param theString 待转换成Unicode编码的字符串。
      * @param escapeSpace 是否忽略空格。
      * @return 返回转换后Unicode编码的字符串。
      */
     public static String toUnicode(String theString, boolean escapeSpace) {
         int len = theString.length();
         int bufLen = len * 2;
         if (bufLen < 0) {
             bufLen = Integer.MAX_VALUE;
         }
         StringBuffer outBuffer = new StringBuffer(bufLen);

         for(int x=0; x<len; x++) {
             char aChar = theString.charAt(x);
             // Handle common case first, selecting largest block that
             // avoids the specials below
             if ((aChar > 61) && (aChar < 127)) {
                 if (aChar == '\\') {
                     outBuffer.append('\\'); outBuffer.append('\\');
                     continue;
                 }
                 outBuffer.append(aChar);
                 continue;
             }
             switch(aChar) {
                 case ' ':
                     if (x == 0 || escapeSpace) 
                         outBuffer.append('\\');
                     outBuffer.append(' ');
                     break;
                 case '\t':outBuffer.append('\\'); outBuffer.append('t');
                           break;
                 case '\n':outBuffer.append('\\'); outBuffer.append('n');
                           break;
                 case '\r':outBuffer.append('\\'); outBuffer.append('r');
                           break;
                 case '\f':outBuffer.append('\\'); outBuffer.append('f');
                           break;
                 case '=': // Fall through
                 case ':': // Fall through
                 case '#': // Fall through
                 case '!':
                     outBuffer.append('\\'); outBuffer.append(aChar);
                     break;
                 default:
                     if ((aChar < 0x0020) || (aChar > 0x007e)) {
                         outBuffer.append('\\');
                         outBuffer.append('u');
                         outBuffer.append(toHex((aChar >> 12) & 0xF));
                         outBuffer.append(toHex((aChar >>   8) & 0xF));
                         outBuffer.append(toHex((aChar >>   4) & 0xF));
                         outBuffer.append(toHex( aChar         & 0xF));
                     } else {
                         outBuffer.append(aChar);
                     }
             }
         }
         return outBuffer.toString();
     }
    
     /**
      * 从 Unicode 码转换成编码前的特殊字符串。
      * @param in Unicode编码的字符数组。
      * @param off 转换的起始偏移量。
      * @param len 转换的字符长度。
      * @param convtBuf 转换的缓存字符数组。
      * @return 完成转换，返回编码前的特殊字符串。
      */
     public String fromUnicode(char[] in, int off, int len, char[] convtBuf) {
         if (convtBuf.length < len) {
             int newLen = len * 2;
             if (newLen < 0) {
                 newLen = Integer.MAX_VALUE;
             }
             convtBuf = new char[newLen];
         }
         char aChar;
         char[] out = convtBuf;
         int outLen = 0;
         int end = off + len;

         while (off < end) {
             aChar = in[off++];
             if (aChar == '\\') {
                 aChar = in[off++];
                 if (aChar == 'u') {
                     // Read the xxxx
                     int value = 0;
                     for (int i = 0; i < 4; i++) {
                         aChar = in[off++];
                         switch (aChar) {
                         case '0':
                         case '1':
                         case '2':
                         case '3':
                         case '4':
                         case '5':
                         case '6':
                         case '7':
                         case '8':
                         case '9':
                             value = (value << 4) + aChar - '0';
                             break;
                         case 'a':
                         case 'b':
                         case 'c':
                         case 'd':
                         case 'e':
                         case 'f':
                             value = (value << 4) + 10 + aChar - 'a';
                             break;
                         case 'A':
                         case 'B':
                         case 'C':
                         case 'D':
                         case 'E':
                         case 'F':
                             value = (value << 4) + 10 + aChar - 'A';
                             break;
                         default:
                             throw new IllegalArgumentException(
                                     "Malformed \\uxxxx encoding.");
                         }
                     }
                     out[outLen++] = (char) value;
                 } else {
                     if (aChar == 't') {
                         aChar = '\t';
                     } else if (aChar == 'r') {
                         aChar = '\r';
                     } else if (aChar == 'n') {
                         aChar = '\n';
                     } else if (aChar == 'f') {
                         aChar = '\f';
                     }
                     out[outLen++] = aChar;
                 }
             } else {
                 out[outLen++] = (char) aChar;
             }
         }
         return new String(out, 0, outLen);
     }
     
}

使用方法如下：

public static void main(String[] args){
    	 String theString="中文汉字+123";
    	 System.out.println(cstk.toUnicode(theString, false));
    	 System.out.println(cstk.fromUnicode(theString.toCharArray(), 0, theString.length(), new char[1024]));
     }

希望对看到的人有所帮助。