Native2Ascii和Ascii2Native的Java实现

下午同事说要一个Native2Ascii和Ascii2Native的Java实现，Google了半天发现有的是错误的实现，有的只有Native2Ascii没有Ascii2Native，有的又是其他语言实现的，干脆自己参考着写了一个。 

package
  
/**
 * native2ascii.exe Java code implementation.
 * 
 * @author
 * @version 1.0
 */
public class
  
/**
     * prefix of ascii string of native character
     */
private static String PREFIX = "\\u";  
  
/**
     * Native to ascii string. It's same as execut native2ascii.exe.
     * 
     * @param str
     *            native string
     * @return ascii string
     */
public static
char[] chars = str.toCharArray();  
new
for (int i = 0; i < chars.length; i++) {  
            sb.append(char2Ascii(chars[i]));  
        }  
return
    }  
  
/**
     * Native character to ascii string.
     * 
     * @param c
     *            native character
     * @return ascii string
     */
private static String char2Ascii(char
if (c > 255) {  
new
            sb.append(PREFIX);  
int code = (c >> 8);  
            String tmp = Integer.toHexString(code);  
if (tmp.length() == 1) {  
"0");  
            }  
            sb.append(tmp);  
0xFF);  
            tmp = Integer.toHexString(code);  
if (tmp.length() == 1) {  
"0");  
            }  
            sb.append(tmp);  
return
else
return
        }  
    }  
  
/**
     * Ascii to native string. It's same as execut native2ascii.exe -reverse.
     * 
     * @param str
     *            ascii string
     * @return native string
     */
public static
new
int begin = 0;  
int
while (index != -1) {  
            sb.append(str.substring(begin, index));  
6)));  
6;  
            index = str.indexOf(PREFIX, begin);  
        }  
        sb.append(str.substring(begin));  
return
    }  
  
/**
     * Ascii to native character.
     * 
     * @param str
     *            ascii string
     * @return native character
     */
private static char
if (str.length() != 6) {  
throw new
"Ascii string of a native character must be 6 character.");  
        }  
if (!PREFIX.equals(str.substring(0, 2))) {  
throw new
"Ascii string of a native character must start with \"\\u\".");  
        }  
2, 4);  
int code = Integer.parseInt(tmp, 16) << 8;  
4, 6);  
16);  
return (char) code;  
    }  
  
}