How does Java determine whether a string contains Chinese characters and filter Chinese characters?

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java to determine characters. Whether the string contains Chinese and filter out Chinese, the specific content is as follows

1. Determine whether the string contains Chinese method encapsulation

/**
 * 判断字符串中是否包含中文
 * @param str
 * 待校验字符串
 * @return 是否为中文
 * @warn 不能校验是否为中文标点符号 
 */
public static boolean isContainChinese(String str) {
 Pattern p = Pattern.compile("[\u4e00-\u9fa5]");
 Matcher m = p.matcher(str);
 if (m.find()) {
  return true;
 }
 return false;
}

Note: Need to import

import java.util.regex.Matcher;
import java.util.regex.Pattern;

##2. Filter Chinese

/**
 * 过滤掉中文
 * @param str 待过滤中文的字符串
 * @return 过滤掉中文后字符串
 */
public static String filterChinese(String str) {
 // 用于返回结果
 String result = str;
 boolean flag = isContainChinese(str);
 if (flag) {// 包含中文
  // 用于拼接过滤中文后的字符
  StringBuffer sb = new StringBuffer();
  // 用于校验是否为中文
  boolean flag2 = false;
  // 用于临时存储单字符
  char chinese = 0;
  // 5.去除掉文件名中的中文
  // 将字符串转换成char[]
  char[] charArray = str.toCharArray();
  // 过滤到中文及中文字符
  for (int i = 0; i < charArray.length; i++) {
   chinese = charArray[i];
   flag2 = isChinese(chinese);
   if (!flag2) {// 不是中日韩文字及标点符号
    sb.append(chinese);
   }
  }
  result = sb.toString();
 }
 return result;
}

3. Test

public static void main(String[] args) {
 String fileName = "test，中文";
 System.out.println(filterChinese(fileName));
}

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