Java实现中文字符串与unicode互转工具类

本文实例为大家分享了Java实现中文字符串与unicode互转的具体代码，供大家参考，具体内容如下

原理利用了java实现js的escape以及unescape函数。

public class UnicodeConvertUtils {

  
  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();

  }

  
  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();
  }

  
  public static String toGb2312(String input) {
    input = input.trim().replaceAll("(?i)\\u", "%u");
    return unescape(input);
  }

  
  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", "\");
  }

  
  public static void main(String[] args) {
    System.out.println(toUnicode("你好"));
    System.out.println(toGb2312("u4f60u597d"));
    // 等同于上面
    System.out.println(toGb2312("\u4f60\u597d"));
  }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。