1.过滤出汉字
String chin = "张帆12211112114";
chin = chin.replaceAll("[^(\\u4e00-\\u9fa5)]", "");
System.out.println(chin); //输出为张帆
2.过滤出数字
chin = chin.replaceAll("[^(0-9)]", "");
System.out.println(chin); //输出为12211112114
3.过滤出字母
String chin = "张帆12211aa1121b14";
chin = chin.replaceAll("[^(A-Za-z)]", "");
System.out.println(chin); //输出为aab