Java判断字符串是否是乱码（亲测可用）

经过几天的努力，终于给爱酷学习网（http://www.icoolxue.com）加上了搜索引擎的支持，现在你可以搜索自己喜欢的视频教程啦。
PS：爱酷学习网是一个全面的视频教程网站，有各类计算机类视频如Java/C/C++/Android/Hiberante等等。

而由此也带来了一个问题，在用户输入查询字符串之后，虽然我已经想尽一切办法解决了乱码问题，但是真正在线上的时候，还是遇到了乱码，百思而不得其解：

可以看到，乱码问题一直存在，于是我在想，如果能判断搜索字符串如果是乱码的话，就不将该条搜索进行处理（意思就是说只搜索，而不将该字符串存放到数据库中），好吧，代码如下：

Java /** * 判断字符是否是中文 * * @param c 字符 * @return 是否是中文 */ 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; } /** * 判断字符串是否是乱码 * * @param strName 字符串 * @return 是否是乱码 */ 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; } } public static void main(String[] args) { System.out.println(isMessyCode("韩顺平")); System.out.println(isMessyCode("你好")); }

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/**      * 判断字符是否是中文      *      * @param c 字符      * @return 是否是中文      */     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;     }       /**      * 判断字符串是否是乱码      *      * @param strName 字符串      * @return 是否是乱码      */     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;         }       }       public static void main(String[] args) {         System.out.println(isMessyCode("韩顺平"));         System.out.println(isMessyCode("你好"));     }

相关代码已经注释，谢谢支持。