Java实现中文字符串与unicode互转工具类

/** * 中文字符串和unicode互转工具类 <br> *  * @author hkb <br> */public class UnicodeConvertUtils {  /**   * 实现js的escape函数   *    * @param input   *      待传入字符串   * @return   */  public static String escape(String input) {    int len = input.length();    int i;    char j;    StringBuffer result = new StringBuffer();    result.ensureCapacity(len * 6);    for (i = 0; i < len; i++) {      j = input.charAt(i);      if (Character.isDigit(j) || Character.isLowerCase(j) || Character.isUpperCase(j)) {        result.append(j);      } else if (j < 256) {        result.append("%");        if (j < 16) {          result.append("0");        }        result.append(Integer.toString(j, 16));      } else {        result.append("%u");        result.append(Integer.toString(j, 16));      }    }    return result.toString();  }  /**   * 实现js的unescape函数   *    * @param input   *      待传入字符串   * @return   */  public static String unescape(String input) {    int len = input.length();    StringBuffer result = new StringBuffer();    result.ensureCapacity(len);    int lastPos = 0, pos = 0;    char ch;    while (lastPos < len) {      pos = input.indexOf("%", lastPos);      if (pos == lastPos) {        if (input.charAt(pos + 1) == 'u') {          ch = (char) Integer.parseInt(input.substring(pos + 2, pos + 6), 16);          result.append(ch);          lastPos = pos + 6;        } else {          ch = (char) Integer.parseInt(input.substring(pos + 1, pos + 3), 16);          result.append(ch);          lastPos = pos + 3;        }      } else {        if (pos == -1) {          result.append(input.substring(lastPos));          lastPos = len;        } else {          result.append(input.substring(lastPos, pos));          lastPos = pos;        }      }    }    return result.toString();  }  /**   * unicode转中文   *    * @param input   *      待传入字符串   * @return   */  public static String toGb2312(String input) {    input = input.trim().replaceAll("(?i)////u", "%u");    return unescape(input);  }  /**   * 中文字符串转unicode   *    * @param input   *      待传入字符串   * @return   */  public static String toUnicode(String input) {    input = input.trim();    String output = escape(input).toLowerCase().replace("%u", "//u");    return output.replaceAll("(?i)%7b", "{").replaceAll("(?i)%7d", "}").replaceAll("(?i)%3a", ":")        .replaceAll("(?i)%2c", ",").replaceAll("(?i)%27", "'").replaceAll("(?i)%22", "/"")        .replaceAll("(?i)%5b", "[").replaceAll("(?i)%5d", "]").replaceAll("(?i)%3D", "=")        .replaceAll("(?i)%20", " ").replaceAll("(?i)%3E", ">").replaceAll("(?i)%3C", "<")        .replaceAll("(?i)%3F", "?").replaceAll("(?i)%5c", "//");  }  /**   * 测试   *    * @param args   */  public static void main(String[] args) {    System.out.println(toUnicode("你好"));    System.out.println(toGb2312("/u4f60/u597d"));    // 等同于上面    System.out.println(toGb2312("//u4f60//u597d"));  }}