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

/**

 * 判断字符串是否乱码

 * @param strName

 * @return boolean

 */

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 = 0;

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;

}

chLength++;

}

}

float result = count / chLength;

if (result > 0.4) {

return true;

} else {

return false;

}

}

private 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;

}

public static void main(String[] args) {
    System.out.println(isMessyCode("韩顺平"));
    System.out.println(isMessyCode("测试"));
}

转自：https://blog.csdn.net/sanamaz/article/details/50925579