java对字符串做处理

package util;

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

public class StringUtils {
    /**  
    * @Description 字符串是否是中文 
    * @date 2018年11月12日下午3:50:16
    */
    public static boolean isChinese(char c) {
        Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
        if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
                || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
                || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
                || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION
                || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION
                || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {
            return true;
        }
        return false;
    }
 
    /**  
    * @Description 字符串是否是乱码 
    * @date 2018年11月12日下午3:49:48
    */
    public static boolean isMessyCode(String strName) {
        Pattern p = Pattern.compile("\\s*|t*|r*|n*");
        Matcher m = p.matcher(strName);
        String after = m.replaceAll("");
        String temp = after.replaceAll("\\p{P}", "");
        char[] ch = temp.trim().toCharArray();
        float chLength = ch.length;
        float count = 0;
        for (int i = 0; i < ch.length; i++) {
            char c = ch[i];
            if (!Character.isLetterOrDigit(c)) {
                if (!isChinese(c)) {
                    count = count + 1;
                }
            }
        }
        float result = count / chLength;
        if (result > 0.4) {
            return true;
        } else {
            return false;
        }
    }
 
	/**  
	* @Description 字符串是否包含乱码 
	* @date 2018年11月12日下午3:45:49
	*/
	public static boolean isIncloudMessyCode(String str) {
		for (int i = 0; i < str.length(); i++) {
			char c = str.charAt(i);
			if ((int) c == 0xfffd) {
				return true;
			}
		}
		return false;
	}
	
	/**  
	* @Description 去除emoji表情
	* @date 2018年11月12日下午3:46:11
	*/
	public static String removeEmoji(String str) {
		return str.replaceAll("[\\ud800\\udc00-\\udbff\\udfff\\ud800-\\udfff]", "*");
	}
    
	/**  
	* @Description 去除回车键 
	* @date 2018年11月12日下午3:48:19
	*/
	public static String removeEnter(String str) {
		
		return str.replaceAll("\n", "");
	}

	/**  
	* @Description URLEncode解码 
	* @date 2018年11月12日下午4:00:23
	*/
	public static String decodeUrl(String str) {
		try {
			return java.net.URLDecoder.decode(str, "utf-8");
		} catch (UnsupportedEncodingException e) {
			return "";
		}
	}
	
}