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Simple example of determining the length of Chinese string in java

高洛峰
高洛峰Original
2017-01-23 16:12:021707browse

Without further ado, here’s the code:

/**
  * 获取字符串的长度,如果有中文,则每个中文字符计为2位
  * @param value 指定的字符串
  * @return 字符串的长度
  */
  public static int length(String value) {
    int valueLength = 0;
    String chinese = "[\u0391-\uFFE5]";
    /* 获取字段值的长度,如果含中文字符,则每个中文字符长度为2,否则为1 */
    for (int i = 0; i < value.length(); i++) {
      /* 获取一个字符 */
      String temp = value.substring(i, i + 1);
      /* 判断是否为中文字符 */
      if (temp.matches(chinese)) {
        /* 中文字符长度为2 */
        valueLength += 2;
      } else {
        /* 其他字符长度为1 */
        valueLength += 1;
      }
    }
    return valueLength;
  }
 
 
 /** 
  * 得到一个字符串的长度,显示的长度,一个汉字或日韩文长度为2,英文字符长度为1 
  * @param String s 需要得到长度的字符串 
  * @return int 得到的字符串长度 
  */  
  public static int length(String s) { 
    if (s == null) 
      return 0; 
    char[] c = s.toCharArray(); 
    int len = 0; 
    for (int i = 0; i < c.length; i++) { 
      len++; 
      if (!isLetter(c[i])) { 
        len++; 
      } 
    } 
    return len; 
  } 
 
 
  /** 
  * 得到一个字符串的长度,显示的长度,一个汉字或日韩文长度为1,英文字符长度为0.5 
  * @param String s 需要得到长度的字符串 
  * @return int 得到的字符串长度 
  */  
  public static double getLength(String s) { 
  double valueLength = 0;  
    String chinese = "[\u4e00-\u9fa5]";  
    // 获取字段值的长度,如果含中文字符,则每个中文字符长度为2,否则为1  
    for (int i = 0; i < s.length(); i++) {  
      // 获取一个字符  
      String temp = s.substring(i, i + 1);  
      // 判断是否为中文字符  
      if (temp.matches(chinese)) {  
        // 中文字符长度为1  
        valueLength += 1;  
      } else {  
        // 其他字符长度为0.5  
        valueLength += 0.5;  
      }  
    }  
    //进位取整  
    return Math.ceil(valueLength);  
  }
根据长度截取内容,区分中英文:
 
/**
   * 截取字符长度,区分中英文
   *
   * @param abc 字符串内容
   * @param len 截取长度
   * @return
   */
  public static String subStr(String abc, int len) {
    if (TextUtils.isEmpty(abc) || len <= 0)
      return "";
    StringBuffer stringBuffer = new StringBuffer();
    int sum = 0;
    char[] chars = abc.toCharArray();
    for (int i = 0; i < chars.length; i++) {
      if (sum >= (len * 3)) {
        break;
      }
      char bt = chars[i];
      if (bt > 64 && bt < 123) {
        stringBuffer.append(String.valueOf(bt));
        sum += 2;
      } else {
        stringBuffer.append(String.valueOf(bt));
        sum += 3;
      }
    }
    return stringBuffer.toString();
  }

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